Brian asks about granting a user read-only access to the mailbox and calendar of another user in an Exchange Server organization.

This is a common scenario and the solution is reasonably simple though perhaps not obvious.

Let’s look at the scenario of Alan Reid trying to access the mailbox of Alex Heyne. With no access configured Alan gets an error message when he tries to open Alex’s inbox in Outlook.


To meet the requirements of this scenario we need to grant Alan read-only access to Alex’s mailbox, not full access, and without making him a delegate.

It is worth noting that the mailbox owner can configure these permissions themselves using Outlook. But I will assume that if you’re reading this you have been asked to handle it for them 🙂

Where some admins get stuck is in the Exchange Management Console, which only presents the option to grant full access to a mailbox.


Instead we need to use the Exchange Management Shell and run the Add-MailboxFolderPermission cmdlet.

The first step is to grant permissions (in this case “Reviewer”) to the “Top of Information Store”.

[PS] C:\>Add-MailboxFolderPermission -Identity alex.heyne:\ -User Alan.Reid -AccessRights Reviewer

RunspaceId   : 2cc2f5f2-77a3-42b6-9221-83cf24c494c6
FolderName   : Top of Information Store
User         : Alan Reid
AccessRights : {Reviewer}
Identity     : Alan Reid
IsValid      : True

Those permissions do not inherit down the mailbox folder hierarchy to existing folders (newly created folders will inherit the permissions of their parent folder though). So you still need to grant permissions for specific folders, for example the inbox:

[PS] C:\>Add-MailboxFolderPermission -Identity alex.heyne:\Inbox -User Alan.Reid -AccessRights Reviewer

RunspaceId   : 2cc2f5f2-77a3-42b6-9221-83cf24c494c6
FolderName   : Inbox
User         : Alan Reid
AccessRights : {Reviewer}
Identity     : Alan Reid
IsValid      : True

Or the calendar:

[PS] C:\>Add-MailboxFolderPermission -Identity alex.heyne:\Calendar -User Alan.Reid -AccessRights Reviewer

RunspaceId   : 2cc2f5f2-77a3-42b6-9221-83cf24c494c6
FolderName   : Calendar
User         : Alan Reid
AccessRights : {Reviewer}
Identity     : Alan Reid
IsValid      : True

This starts to get tedious if you want to grant permissions to the entire mailbox folder hierarchy. For that you would need to write a script.

Here is an example:

#Proof of concept code to apply mailbox
#folder permissions to all folders in
#a mailbox

param (
	[Parameter( Mandatory=$true)]
	[Parameter( Mandatory=$true)]
  	[Parameter( Mandatory=$true)]

$exclusions = @("/Sync Issues",
                "/Sync Issues/Conflicts",
                "/Sync Issues/Local Failures",
                "/Sync Issues/Server Failures",
                "/Recoverable Items",

$mailboxfolders = @(Get-MailboxFolderStatistics $Mailbox | Where {!($exclusions -icontains $_.FolderPath)} | Select FolderPath)

foreach ($mailboxfolder in $mailboxfolders)
    $folder = $mailboxfolder.FolderPath.Replace("/","\")
    if ($folder -match "Top of Information Store")
       $folder = $folder.Replace("\Top of Information Store","\")
    $identity = "$($mailbox):$folder"
    Write-Host "Adding $user to $identity with $access permissions"
    Add-MailboxFolderPermission -Identity $identity -User $user -AccessRights $Access -ErrorAction SilentlyContinue

You can download the full Add-MailboxFolderPermissions.ps1 script from Github here.

[PS] C:\Scripts>.\Add-MailboxFolderPermissions.ps1 -Mailbox alex.heyne -User alan.reid -Access reviewer

So as you can see, granting read-only access to specific mailbox folders is quite simple, with just a little extra work required (or a script like the one above) to apply the permissions to all existing mailbox folders.

If you’re looking for a script to remove mailbox folder permissions I have also published Remove-MailboxFolderPermissions.ps1.

About the Author

Paul Cunningham

Paul is a former Microsoft MVP for Office Apps and Services. He works as a consultant, writer, and trainer specializing in Office 365 and Exchange Server. Paul no longer writes for


  1. Alex

    [Part 1/3]
    Hi Paul,
    Could you please clarify what happen and how to change situation to correct?
    Company had got two domains:,
    Shared mailbox:
    Users:,, All can “SendAs” and “SendOnBehalf” of
    Exchange online.
    There is Archive folder at, with subfolders should be read-only for every user. Admin ( should have full access folders here.
    Default status is:
    Get-MailboxFolderPermission -Identity info:\Archive

    FolderName User AccessRights
    ———- —- ————
    Archive Default {None}
    Archive Anonymous {None}

    For testing I used simply command your beautiful script uses too:
    add-MailboxFolderPermission -Identity info:\Archive -User user1 -AccessRights Reviewer
    add-MailboxFolderPermission -Identity info:\Archive -User admin -AccessRights Owner

    Then check the result:
    Get-MailboxFolderPermission -Identity info:\Archive

    FolderName User AccessRights
    ———- —- ————
    Archive Default {None}
    Archive Anonymous {None}
    Archive User1 {Reviewer}
    Archive Admin {Owner}

    Everything ok…

  2. Alex

    [Part 2/3]

    Then check the result:
    Get-MailboxFolderPermission -Identity info:\Archive

    FolderName User AccessRights
    ———- —- ————
    Archive Default {None}
    Archive Anonymous {None}
    Archive User1 {Reviewer}
    Archive Admin {Owner}

    Everything ok…

    Then user1 opens his outlook 365. He not only could see Archive and its subfolder (it is ok) but he can create/move/rename/delete everything in Archive and its subfolder (not good). Moreover, he can open “Properties” of folder “Archive”, “Permission”, and view and change every permissions at this window.
    For instance, user1 see his permissions as “Reviewer” and freely could change one to “Owner”. Also change admin’s permissions from “Owner” to “None” (not good at all).

  3. Alex

    Hi again Paul
    It seems my long question is too long (I tried to divide one to 3 parts but see only 3-rd, others disappeared).
    In short words:
    creates permissions but permissions do not work and could be freely changed by user with “None” permissions to “Owner” with user’s outlook.
    What is wrong with me/folders/mailbox?
    How to make permissions really works?

    1. Avatar photo
      Tony Redmond

      First, it’s kind of optimistic to ask questions for an article written 10 years ago. Lots can change over 10 years, especially in the cloud. Second, Paul doesn’t work on the site anymore. Third, if you have a problem with the way permissions work, it’s best to log a support call with Microsoft. We cannot access your data – they can. And if a problem exists, support can escalate to engineering to have someone work on the issue.

      1. Alex

        Hi Tony,
        I have to be optimistic. How else I could find solution.
        I am not alone. There are at least 5 guys who tried to get response after 2019.
        Ok, I will try Microsoft directly if there is only place where to find solution.
        Anyway, thank for response!
        Have a nice day!

        1. Avatar photo
          Tony Redmond

          Well, without the original author available, you’re asking someone to spend potentially several hours to understand your question, do testing, and possibly find a solution. Not everyone has that free time…

          But support have time available to respond to customer queries. And if a problem does exist in the software, they can escalate to engineering, so it’s the best outcome.

  4. Alex

    [Your site thinks that my message is too long so I have to divide one to not loose details]
    [Part 3/3]

    These changes immediately appears at:
    Get-MailboxFolderPermission -Identity info:\Archive

    So modifications made by user1 are real…

    So what I do wrong and how to make permissions to folder and subfolders work really?

    P.S. I supposed that Archive could be “some special system folder with special properties” and tried to do the same with ordinary folder “ABCD”. And had got the same result – permissions are exist but do not work.

  5. Justatech

    Hi Paul,

    Thanks a lot for that post that get me so close to my goal.

    Is it really that with Add-MailboxFolderPermission you can’t add the mailbox in Outlook as a standalone like you could when share is done with GUI (file / account setting / new) but need to add it as a second mailbox (More Settings / advanced tab / add) ?
    In the last case you won’t be able to use “send as” without typing it manually.

  6. Hendrik

    how can i do this for multiple users at once? i need to grant reviewer rights for 1 user to multiple mailboxes.

  7. Pavan

    Hello ,

    It is not working for OWA. I am unable to open target mailbox in OWA because of reviewer access. If I change the access to full access then I can open the target mailbox in OWA but the full access on mailbox is overwriting the folder level reviewer access. Any suggestions to achieve read-only for OWA users.

  8. Steve

    Thanks for the script.

    I’m seeing an error for every folder stating “WARNING: The user “” is either not valid SMTP address, or there is no matching information.”

    Other searching has indicated this is because the mailbox I’m targeting is a Shared mailbox. (I don’t think it is relevant, but the environment is Office 365, not on-prem.)

    Are you familiar with this error and do you know how I may correct things to eliminate it?


    1. Steve

      Never mind – you can delete my question if you’d like. Turns out I was mistaken. The mailbox I was targeting was a user mailbox, but the *User* I specified is a Shared Mailbox. So that explains that.

  9. vicky

    After we run the folder permission command then how to add user account to our mailbox without full accessing? I am almost there but bit confusing. Can you please tell me how to add user account to our Outlook Client?


  10. DoReMi

    I am getting the following error

    WARNING: No snap-ins have been registered for Windows PowerShell version 5.

    1. premax

      As Bart Louwagie mentioned, comment out everything from

  11. Chris Nenzel

    Hi Paul! Just stumbled across this script as a result of a user request to give about 20 people read only access to an Exchange 2010 shared mailbox.

    When I run the script I get the following error:

    [PS] H:\ExchReports\MailboxFolderPermissions>.\Add-MailboxFolderPermissions.ps1
    : Missing ‘)’ in method call.
    + CategoryInfo : ParserError: (CloseParenToken:TokenId) [], ParseException
    + FullyQualifiedErrorId : MissingEndParenthesisInMethodCall

    Any idea why?


    1. Chris Nenzel

      When I ran the command from my workstation in EMS it didn’t give me the position of the error but when I ran it from an Exchange server it did…

      EMS states the script has an error at PS1:113 char:34 which is in the line $folder = $folder.Replace(“\Top of Information Store”,”\”) between the ” and the \ if I’ve counted correctly. The exchange server complains about the same error in the remove script…

      I’m not savvy enough to figure this out on my own. Hoping someone will chime in with a reply on how to fix this.

      1. Tim

        In the script files downloaded from github , there are smart-quote characters in the line below that PowerShell doesn’t parse correctly:

        $folder = $folder.Replace(“\Top of Information Store”,”\”)

        Replace them with standard double quote characters to fix it.

        My PowerShell reported the error as follows:

        At Remove-MailboxFolderPermissions.ps1:107 char:34
        + $folder = $folder.Replace(“\Top of Information Store”,”\ …
        + ~
        Missing ‘)’ in method call.

  12. Alex

    Hi Paul,
    Thanks a lot from Toronto.
    Your script was a huge help, thanks again,
    For folks using Exchange 2016 just edit the line for Exchange Management Snapin with below
    Add-PSSnapin Microsoft.Exchange.Management.PowerShell.SnapIn

    1. Bart Louwagie

      Thank you for this clear script!

      When connection via IE or Edge to Exchange online (Office 365) by using the admin , going to hybrid > Configure > Connect-EXOPSSession , I get the same WARNING: No snap-ins have been registered for Windows PowerShell version 5 and nothing seems to execute.

      Here is how I solved it: I commented out the Initialize section about lines 68-94, basically running only the part after
      # Script

  13. Marc

    Hi Paul,

    I hope you still follow this thread, since you first published it FIVE years ago!

    We need to move away from Exchange to Gsuite by command of our New Overlords who have bought our company.

    There are two things that don’t quite work with your wonderful script (a true life-saver, no, time-saver!)

    If the sub-folder contains a forward slash, I get a warning that it can’t find the folder.
    E.g. “user:Inbox\cashflow/balances”

    Also the script is very English-oriented. It can’t perform the operation on French, German, Polish and Dutch “Top of Information Store”s. Is there a common solution for this, or do the Top of Information Store names be specified for each individual language?

    French: Partie supérieure de la banque d’informations
    German: Oberste Ebene des Informationsspeichers
    Polish: Folder nadrzędny magazynu informacji
    Dutch: Bovenste map van gegevensarchief

    I hope you, or anyone else with some scripting knowledge can help me out.

    Best regards,

    1. Marc

      Huh, that last bit is simple: just copy the bits between the curly brackets where it deals with the Top of Information Store, replacing said text.

      The forward slash seems to be tricky as it replaces all forward slashes with backslashes? Not sure though.

      1. Marc

        $folder = $folder.Replace(“”,”/”)

        Heh, just copy the question-mark-in-a-box from the output into the script and hey presto!

  14. Mike


    i used this script to give a user limited permissions to another Mailbox in Office 365 but the user can’t open the Mailbox. Owa gives the error OwaExplicitLogonException if i try to open the Mailbox and Outlook tells me a Client process failed.

    Can you Help?

  15. Ario

    Hi paul,

    Thanks for sharing this Article,

    When I run this command to Giv reviewer Access to Another user mailbox, I recieve this error :

    The operation couldn’t be performed because ‘user:\Inbox’ couldn’t be found.
    + CategoryInfo : NotSpecified: (:) [Add-MailboxFolderPermission],
    + PSComputerName :

    this not work for any of my users mailboxes

    what is the issue ?


  16. Stef V

    Just a quick question regarding online archive. The current script changes the permissions of the mailbox of the user, not the permissions of his/her online archive… What do I need to change to include the also the online archive folders in the script?

  17. Fathi

    Thanks for your great efforts

    How can i share a folder under contacts folder in exchange 2010

  18. Brian

    Oh, sorry… the why… We are migrating away from Exchange to another platform, but two things are making the migration more difficult than necessary: (1) some users may be using Exchange intentionally to thwart the efforts and (2) many users have multiple devices that are (probably) unwittingly connecting to Exchange.

    By creating the transport rule that rejects all messages sent from within the organization solves the sending problem, but I also have some users which are still creating, modifying, and deleting events from their calendars and complaining that other users aren’t getting meeting invitations, etc. (Yes, we actually have users who are that technologically challenged. Unfortunately, we have a fairly liberal BYOD ‘policy’ so that complicates things exponentially.)

    The best solution would be to revoke access for all BYODs, but the IT department does not make policy decisions and if I did that, I’d be looking for a new job next week. 🙂

    1. Avatar photo
      Paul Cunningham

      I think you’re out of luck. If it was a business process thing, e.g. something that you should be using a shared mailbox for, that would probably have a solution.

      What you’ve described is simply a human problem. IT often not empowered to fix those, especially if you can’t do anything impactful like blocking mobile devices. I would just do my best to provide the information and education to help users during the transition process, and live with the disruption until the project is complete.

  19. Brian

    Hi Paul!

    I have need to take away a user’s ability to create/edit/remove events on their own calendar. I think I’m close, but something is missing.

    If I’m working on usr1’s box, I am trying this…
    Add-MailboxFolderPermission -identity usr1\Calendar -user usr1 -AccessRights Reviewer
    Add-MailboxFolderPermission -identity usr1\Calendar -user usr2 -AccessRights Owner

    These complete successfully with…
    Calendar usr2 {Owner}
    Calendar usr1 {Reviewer}

    However, usr1 can still modify his/her calendar. Any suggestions?


    1. Brian

      Hmmm, not sure what happened to the colons, but they are present in my script.

    2. Avatar photo
      Paul Cunningham

      I’ve never seen a solution that prevents a person from managing their own calendar.

      1. Brian

        Ok, thanks… Is it possible to remove the calendar folder and still leave the rest of the mailbox intact? (P.S. Thanks for such a quick reply!)

        1. Avatar photo
          Paul Cunningham

          Remove the calendar from the mailbox? No, I don’t think there is a way to do that.

          Maybe if you explain your actual requirements here I can make some other suggestion.

          1. Brian

            I need to prevent users from using (modifying) their Exchange calendars from either Outlook (Mac/Win), OWA, or other mail clients, including those on iOS/Android.

            Yes, it would be ideal to just train them, but unfortunately that doesn’t seem to be 100%, or even 75%, effective.

          2. Brian

            Actually, in this case, what would solve this problem (and another which was solved in a different way) is if I could make the whole mailbox read-only for this group of users. Ideally, they should not send/delete emails or modify calendar events. Can I give ownership of the entire mailbox to another user (admin acct) and make the original owner to be just a reviewer of their own mailbox?

            I had already solved the problem of denying the sending of mail with a transport rule, but if I could just give them read-only access to their own mailboxes (and calendars) that would solve all of my problems.

            I know all too well how little time there is and how precious it is. I do appreciate yours!

          3. Avatar photo
            Paul Cunningham

            But why? I’m no closer to understanding what business reason there is for this? Maybe there is an alternative solution, one that is possible to achieve from a technical standpoint.

            Owners can access their own mailbox and mailbox folders, that is the reality you should start from. I don’t think you’re going to get any joy from trying to stop owners accessing their own mailbox.

  20. David Geiger

    Hi, Paul- can I get more granular with this? I have to do custom permissions. My users need “Contributor” plus Read – Full Details.

    Is that possible with this script? Thanks!

    This is awesome, btw.

  21. aldo

    Ok thanks not sure if this has been answered. but i can grant access. that works. But if i want the person to see the inbox on the left pane in outlook. How is that done?

    they lose access to the folder as soon as they do anything else in outlook


    1. Avatar photo
      Paul Cunningham

      When you grant access using folder permissions there’s no auto-mapping of the mailbox. You will need to manually add the mailbox as an additional mailbox in the user’s Outlook profile.

  22. Matt Freshwater


    I was wondering if someone could please explain what I need to change in this script to only apply to calendars? I know when I write the command in PS it’s -User\calendar but I don’t know where to add the “:\calendar” in this script. Thank you in advance for your help.


    1. Avatar photo
      Paul Cunningham

      If you only want to apply it to calendars you don’t really need to use the script do you? There’s a one-line command shown in the article above for applying permissions to calendars only.

      1. Matt Freshwater

        No, not necessarily, however, this script is very helpful if I need to do it time and time again. It could save me time by only needing to enter the mailbox, user account, and access level. It also gives my other IT staff members a way to change permissions via PS if I am away (it’s just easier). For some reason in my organization calendar permissions are constantly changing. It would just be a big help.

        Thanks for the quick response, Paul.

        1. Avatar photo
          Paul Cunningham

          Ok. You could probably cut the script down to just a couple of lines that takes the mailbox name as input and then runs the two commands to add the permissions to the mailbox root and then to the calendar folder. Most of the logic in the script is required for looping through the entire list of mailbox folders (except for the exclusions), so you don’t need all that.

          1. Matt Freshwater

            Thanks Paul. Would you be able to help me do that? I’m not versed in PS scripting. Thank you in advance.

            Have a great weekend!



          2. Avatar photo
            Paul Cunningham

            This is an example of an excellent learning opportunity then. Adjusting other people’s scripts and code samples for own needs is a great place to start.

          3. Matt

            I have tried playing with this script, other scripts (hence my need for my original post), but my lack of experience in PowerShell makes it very difficult to know if I’m even going in the right direction. This is an excellent opportunity for a teaching moment 😉 If you don’t care to, that’s fine. I won’t die without this script working the way I need it to, it just saves time.

          4. Avatar photo
            Paul Cunningham

            I recommend the PowerShell “month of lunches” book as the best place to start. You’ll learn a ton just from the first few hours you spend on it. There’s also great PowerShell courses on Pluralsight covering fundamentals, scripting, toolmaking, advanced functions, there’s even one on Exchange admin using PowerShell by yours truly.

            The resources are all there, and to put it as friendly but bluntly as I can, it’s 2017 and you’ve identified that your PowerShell experience is lacking. You need to fix that ASAP. I don’t mind providing scripts for more complex stuff here but the basics are something everyone needs to learn.

            Start with the resources above. In a month you’ll wonder how you lived without PowerShell and you’ll be saving time on this task and many, many more. I have never met an IT pro who regrets investing time in learning PowerShell.

      2. Wilfred

        Hi Paul, to shorten it, why not using the identity instead of folderpath?

        $mailboxfolders = (Get-MailboxFolderStatistics $Mailbox | Where {!($exclusions -icontains $_.FolderPath)}).identity

        foreach ($mailboxfolder in $mailboxfolders)
        if($mailboxfolder -match “Top of Information Store”){
        $folder = $mailboxfolder.Replace(“\Top of Information Store”,”:\”) }
        $folder = $mailboxfolder.Replace(“\”,”:\”)

        Seems simpler.

  23. Greg

    Get-MailboxStatistics sometimes “replaces” characters in the folders’ names if they contain illegal characters. I have seen references that both the “\” and “/” characters are not allowed. (Why does Exchange allow users to create folders that contain illegal characters… Another topic, I am sure.) So the “folder name” returned by Get-MailboxStatistics cannot be used in the pipeline:

    jones:\archive\Inbox\Inbox\Conferences\2016\Spurs San Antonio, TX 11?6-7?16
    The operation couldn’t be performed because ‘jones:\archive\Inbox\Inbox\Conferences\2016\Spurs San Antonio, TX 11?6-7?16’ couldn’t be found.

    I am guessing this was a “date” (11/6-7/16 -or- 11\6-7\16, but how can I use the results/output from Get-MailboxStatistics for any other command?

    Using .FolderPath becomes an issue. I am trying to figure out the .FolderID property, hoping it will work better in the pipeline…

  24. Azer

    Hello, Paul.
    Thank you for a great script.
    I have a question – what is a reason to exclude folders listed in the $exclusions ?

    1. Avatar photo
      Paul Cunningham

      To exclude some system folders that users typically would not need access to, and also to demonstrate how to exclude folders if your scenario requires it.

  25. Rick Shepard

    Thank you Paul for all of your great articles. I have found them extremely helpful, to the point and relatively easy to follow. I am also happy to se they are kept current as I only recently moved up to Exchange 2013 from 2007.


  26. Suriya

    I did try to give the top information as reviewer and give a “owner” on one of the folder (created as subfolder).

    When i tried to open that folder by adding the mailbox as addtional, i could’t expend the folder

    How long shall i wait?

  27. Antonio

    Hi Paul,

    Love your work!! Really helping me out in my new role, with simplifying things and automating tasks.

    With this script, it is overwriting the previous permissions;

    For example,

    I have a reviewer group already with review access on all folders, when I run the script for a new group to be added, it just overwrites the previous.

    Is there are way to add a new group without overwriting the existing?

    Hope that makes sense.


    1. Avatar photo
      Paul Cunningham

      That’s not the behavior I get. I can’t think why adding another user/group would remove any other user/group permissions already on the folder.

  28. Gav

    thanks much appreciated

  29. Gav

    Hi Paul,

    I am trying to grant reviewer access to the Default user on all calendars in our Exchange 2013 org. I’m using the following script but it just sits there with two arrows like it’s waiting for another value. Any ideas what I am doing wrong?

    Get-Mailbox -resultsize unlimited -RecipientTypeDetails UserMailbox | ForEach {Set-MailboxFolderPermission -Identity “$($_.alias):Calendar” -User default-AccessRights “Reviewer”

    1. Avatar photo
      Paul Cunningham

      You’ve opened a curly brace and then you haven’t closed it again.

  30. Alexis Crawford

    Great article that’s for sure. Paul not too sure if I can import a list of users and have the script executes on each user.

    import-csv C;path | then I’m not too sure how to go about it.

    I’m sure it can be done just not too sure of the syntax.

  31. Keshav

    Good Article Paul 🙂

  32. Manish Kumar

    Hi All,

    How can i provide reviewer access to a security group. I have a request to provide reviewer access to one shared mailbox to everyone in the organization. Can it be done, If yes please guide

  33. Josh Smith

    Hi Paul,
    These scripts are great! I’m very new to using powershell and I only understand about 5% of what is in your scripts but I’m slowly figuring things out. I even managed to modify one for a set-mailboxfolderpermissions.
    We have a mailbox set up for archiving email with thousands of folders. Each project has it’s own set of folders.
    Anyway, I have a user group that currently has publishing author access rights but I need to modify it so nothing can be deleted. As far as I can tell there is no “-accessrights deletenone”. What I think I’ve figured out is I need to give them Reviewer access rights and then set createitems,createsubfolders,editowneditems on. It appears, however, that I can’t enter a string of commands into your script. Is there anyway to modify the script to accept this or any other work around that you could suggest? I’m so close to being finished, it’s just this one last obsatcle. 🙂
    Looking forward to your response.

    1. Josh

      Well, in the process of typing up my original message, a thought occurred to me and it appears to have worked. I took out $access from the command line and replaced it with the string of access rights I needed. It didn’t matter what permission I applied at the prompt.

      Regardless, thanks for your help! Your scripts have been invaluable. 🙂

  34. Steve

    Got it… thanks!

  35. Steve

    Thank you – though now that I think about it a bit more, I think maybe what I really wanted to ask was, is there a way to programmatically add the mailbox via the powershell script (like with manage full access permissions within Exchange), rather than manually adding it via Outlook?

    1. Avatar photo
      Paul Cunningham

      No, auto-mapping doesn’t work when you grant access as folder permissions.

  36. Steve

    Hi Paul,

    Great article – it’s now April of 2016 and the article you wrote back in September of 2013 is still helping people!

    Now we are finally able to apply read only permissions to a disabled Exchange account; however, my question is this – generally when we disable accounts, our procedure dictates that we ‘hide’ the Exchange mailbox. The issue here, is that when you hide a mailbox, you can’t add it via the account settings within Outlook. Do you know of a way to add an account to Outlook without ‘un-hiding’ said account?

  37. Galin

    This is very useful article and script, however I am thinking that if the original user creates additional folder in his/her mailbox, the user who has reviewer access will not see the new folder, i haven’t tested it but seems logical as access is granted per folder.

    1. Avatar photo
      Paul Cunningham

      From the article…

      “permissions do not inherit down the mailbox folder hierarchy to existing folders (newly created folders will inherit the permissions of their parent folder though)”

      1. Galin

        Thanks Paul, I missed that one out, however I tested and it works.

        Much appreciated

  38. Jon Morgan

    I’ve got a weird one…

    I’m trying to grant access to a group of users (Group A), allowing full access (Pub Ed) rights to a specific calendar folder only in User A’s mailbox. So I’ve added Group A to the TopOfInfoStore with “Folder Visible” of User A’s mailbox, then I’ve added Group A to the permissions of only the specific calendar folder with PubEd rights.

    When I log on as a user who is a member of Group A, add User A’s mailbox as an additional mailbox to the Outlook profile, the mailbox appears. I can open it and see all the sub-folders (great), I can open the specific calendar folder and see, create and edit (great), I can see the contents of all the mail folders (not so great), I can delete any item in the folders I care to (REALLY not great!).

    I’ve also noticed, If I add an item to the specific calendar folder and then open it again, down in the bottom right it’s says “Last modified by User A”, when I was expecting “Last modified by [user who is member of Group A]”, which leads me to suspect I’m being allowed access to everything in User A’s mailbox, because somehow my access is being granted via ‘impersonation’ of User A somehow???

    Any tips appreciated…

  39. Lamees

    dear Paul

    I would like to thank you for sharing your knowledge with us 🙂

    My problem is slightly different, When I granted the user (reviewer) permission, he can’t delete or add new items (which is great) but the problem that he can replay and forward the email to everyone and the big problem that he can pick any user from the address book in the (from) field !!!!

    Kindly, can you help me on that issue?


  40. Robert


    I am confused on why your -Identity and -User values show alan reid when you typed different values for each?

    Also i cant remove this:

    RunspaceId : e8dde2df-9e33-4145-a37a-9046a871f47b
    FolderName : Top of Information Store
    User : John Adams
    AccessRights : {Editor}
    Identity : John Adams
    IsValid : True

    Everytime i try it keeps saying that There is no existing permission entry found for user: John Adams. IN the above example i granted mailbox permissions on a conference room mailbox.


  41. yogesh

    Hi I have Exchange 2013 and tried adding the read only permissions for a Resource (Room) for a user. Used the command as such

    Add-MailboxFolderPermission -Identity abc: -User xyz-AccessRights Reviewer

    Add-MailboxFolderPermission -Identity abc:Calendar -User xyz-AccessRights Reviewer

    Then I ran this command to check permissions

    Get-MailboxPermission abc

    But I don’t see XYZ user anywhere with Reviewer permissions. I see all the users whom I have given full access permissions from Exchange Control Panel but not this user. Is there is any other way to give any user ReadOnly permissions for a Room Calendar

  42. Mike

    Paul, one thing I added was to first check the current permissions on the folder and if the user had permissions already set, I would modify them instead. This prevented the script from throwing an error if permissions were already defined on the folder. I also have the script sending the requesting individual a html formatted email with the steps to add the mailbox through Outlook

    (code removed)

    1. Mike

      Pasting the above information pulled the HTML code out of the function, I can email you the complete code if interested.

  43. Frakse

    Hi Paul,

    What a kind heart you have to share such amazing knowledge for the benefit of us who are not too tech savi, I believe even other IT pros to will definitely need this.

    Thanks and thumbs up to you.

    Frakse of Papua New Guinea

  44. Hendri de Vries

    Due to HTML formating i reformatted my question;

    Hi Paul,

    First of all, great article!

    I have a question about the permission inheritance of the “Top of Information Store”.
    I’m having a folder called ex-employees. A current colleague, called colleague1, needs to access this folder ( reviewer permission )

    I set this permission by; Add-MailboxFolderPermission -Identity ex-employees: -AccessRights Reviewer -User colleague1

    The following step will be to give colleague1 rights to the folder of the ex employee, this by doing; Add-MailboxFolderPermission ex-employees:ex-employee1 -AccessRight Reviewer –User colleague1
    So far so good!

    Then the next colleague sadly leaves the company and has his box made available in the ex-employees mailbox archive.

    Colleague2 needs to review ex-employee2’s old email;

    Add-MailboxFolderPermission -Identity ex-employees:ex-employee2 -AccessRights Reviewer -User colleague2

    and to the subfolder of ex-emplyee2

    Add-MailboxFolderPermission ex-employees:ex-employee2 -AccessRight Reviewer –User colleague2

    Due to the inheritance of accessrights of the top of information store, colleague1 will have access to both folders; ex-employees:ex-employee1 and ex-employees:ex-employee2

    So the question is;

    – How can i disable the inheritance of accessrights on the top of information store so the above situation will not accur?

    Kind regards,

    Hendri de Vries

  45. Hendri de Vries

    Hi Paul,

    First of all, great article!

    I have a question about the permission inheritance of the “Top of Information Store”.
    I’m having a folder called ex-employees. A current colleague, called colleague1, needs to access this folder ( reviewer permission )
    I set this permission by; Add-MailboxFolderPermission -Identity ex-employees: -AccessRights Reviewer -User
    The following step will be to give colleague1 rights to the folder of the ex employee, this by doing; Add-MailboxFolderPermission ex-employees: -AccessRight Reviewer –User
    So far so good!

    Then the next colleague sadly leaves the company and has his box made available in the ex-employees mailbox archive.

    Colleague2 needs to review ex-employee2’s old email;

    Add-MailboxFolderPermission -Identity ex-employees: -AccessRights Reviewer -User

    and to the subfolder of ex-emplyee2
    Add-MailboxFolderPermission ex-employees: -AccessRight Reviewer –User

    Due to the inheritance of accessrights of the top of information store, colleague1 will have access to both folders; ex-employees: and ex-employees:

    So the question is;

    – How can i disable the inheritance of accessrights on the top of information store so the above situation will not accur?

    Kind regards,

    Hendri de Vries

  46. Stephen

    Have you had any luck with applying the same Read Only Script to the Users Archive mailbox?

  47. Jay

    Hello –

    Good stuff as always Paul!

    I tried adding in the -automapping $ True parameter into the script but, get back a warning that the position parameter cannot be found that accepts the argument. ‘-AutoMapping’ Below is where I added the parameter, is this possible to do achieve one nice thing about full access is automapping and not having to track down end users and walk them through how to add the mailbox manually.

    Add-MailboxFolderPermission -Identity $identity -User $user -AccessRights $Access -Automapping $true -ErrorAction STOP
    Write-Warning $_.Exception.Message

    # End

    1. Avatar photo
      Paul Cunningham

      There’s no -AutoMapping parameter for Add-MailboxFolderPermission.

  48. Frank

    Hi Paul,

    Thanks again for such a handy script. I had the same issue trying to add a Universal SG to the folder permissions.

    I was pulling my hair out with >100 users abusing me they can’t open their Social mailbox while I was running over and over the script saying the permissions were added successfully but they weren’t.

    Then I realised that the script had SilentlyContinue on the ErrorAction switch and it wasn’t reported the error. I mail-enabled the SG, re-ran the script and became the hero of the day in the Server department. 🙂

  49. Jerry Loyd

    Does anyone have experience with this on Office 365? The same instructions all work, but what I’m seeing is that “FolderVisible” ended up giving FullAccess to the user who just wanted to see one subfolder.

    After that, every attempt to remove all access is just not working. It’s like once the deed is done, you can’t undo it.

  50. Duncan Bachen

    The problem that I’ve run into is that add-mailboxpermission allows you to supply a Security Group, but add-mailboxfolderpermission does not. It has to be a user.

    This seems to be a change from 2010 to 2013, and there are plenty of folks who are supplying syntax for add-mailboxfolderpermission saying you can supply a group, but it doesn’t work.

    It even says so in the techNet syntax:

    The User parameter specifies who’s granted permission to view or modify the folder contents of the user specified in the Identity parameter. This parameter accepts only users and distribution lists that have SMTP addresses. Security Groups are not allowed. The following values are acceptable:
    SMTP address

    Holds true for both Domain Local or Universal, no SG works.

    Hoping there was a workaround, because managing a group mailbox is really difficult without group membership. I can’t add and remove every single person.

    1. Duncan Bachen

      What I was able to do was to first make the security group be universal. Then I mail-enabled it. Once it was a mail-enabled security group, you could refer to it by it’s SMTP address.

      I hid the group from the Exchange GAL.

      For my purposes, I was trying to grant the group reviewer access so that they could only read messages in a certain box.

      The end users in the group can now read the messages. if they delete them, they aren’t stopped, so it looks like they are deleted in the GUI, but as soon as you go back to the folder, the messages are there as if they hadn’t been deleted.

      1. Frank

        Thanks Duncan. This saved my day (and probably my work).

        I’m not a highly experienced Exchange guy as you are but I’ve found that MS documentation in Technet is so unrealistic and poorly applied to day-to-day battles that admins face. Reason why I’m loving this blogs and their participants.

  51. Junaid Abrar

    Hi Paul,
    Can you please guide me on how to delegate Reviewer right on All Mailboxes. i-e we are adding a reviewer rights on a mailbox, whereas we have a requirement to add an Audit account to review all users mailbox.

    I know I can do full access using -AccessRights Full Access. But wanted to delegate only read only rights.

    Really appreciate your help, Thank you.

  52. Milton Lopez

    Great one again, Paul, thanks.

    Could you please clarify what type of AD groups should be used to grant permissions to shared mailboxes (Security vs. Distribution, Global, vs. Universal)?

    There seems to be some issues with Security groups, particularly for mailboxes that were first created in previous versions of Exchange. For example, there is a discussion on this that started in 2011 and it is still open:

    1. Avatar photo
      Paul Cunningham

      There’s two simple rules to remember:

      1) When applying permissions it has to be a Security group. It can be a mail-enabled Security group (and therefore act as a distribution list as well), as long as it is a Security group.
      2) When doing anything groups-related with Exchange it has to be a Universal group.

      So the answer is always to use a Universal Security Group.

  53. Kyle Barina

    Thanks for the script! I had to modify it slightly:

    $folder = $mailboxfolder.FolderPath.Replace(“/”,””)
    $folder = $folder.Replace([char]63743,”/”)

    PowerShell was replacing [char]63743 with a ? and I was getting errors on those entries.

    1. shaptoni

      Super script, thanks
      I have one issue in that if a folder has a / or the permissions are not granted:
      WARNING: The operation couldn’t be performed because ‘user:InboxTest ?’ couldn’t be found.
      WARNING: The operation couldn’t be performed because ‘user:InboxTest ‘ couldn’t be found.
      WARNING: The operation couldn’t be performed because ‘user:Test ?’ couldn’t be found.
      WARNING: The operation couldn’t be performed because ‘user:Test ‘ couldn’t be found.
      I have modified the folder.replace and folderpath.replace but cant get it to work
      can anyone fix this?

      1. Duncan Bachen

        Are you sure the problem might not be the space after “test”. unsure if that’s the way you typed it, or if that was a copy/paste

        1. shaptoni

          Thanks for the response, I have tried it with the space removed but I get the same result. Does it work for you?

  54. Praveen Kumar


    Thanks for the script, its much useful. Its really a great job!!!

    Can you please add one more script for revoking the permission as well? i used to receive request for adding and removing as well 🙂 Hope its simple for you.

  55. Scory

    Hi! I am sorry for my english. Is it possible to grant read-only permissions to another users’s archive mailbox? I granted neccessary rights through Outlook (top of archive mailbox and Inbox folder) then I filled msExchDelegateListLink attribute to make autodiscover possible to display this archive mailbox in Outlook, but I can’t expand archive mailbox, I got an error “Cannot expand the folder. The set of folders cannot be opened”. Thank you!

  56. Mohammed Maulana

    Hey Paul,

    Thanks for this amazing post. Your posts always help many exchange admins out there. I have got a request from one of my users and the request is, User A has full access to User B’s mailbox but User B does not want User A to create any calendar entry. Is this possible? I tried giving below command but it did not work.

    add-mailfolderpermissions -identity user B:contacts -user A -accessright reviewer

    Can you please help me here?

  57. Conrad


    You’re a legend! You save my day!

  58. Andrew Lee

    Your script just save my day!.

    I just would like to know how do i remove the permission from all folders when i’m requested to remove the user as Reviewer?

    can i use the same script but change the following?
    Add-MailboxFolderPermission -Identity $identity -User $user -AccessRights $Access -ErrorAction SilentlyContinue


    Remove-MailboxFolderPermission -Identity $identity -User $user -AccessRights $Access -ErrorAction SilentlyContinue

    1. Avatar photo
      Paul Cunningham

      Yes, changing Add- to Remove- should basically do the trick but I suggest testing it first to make sure it gives you the desired outcome.

  59. Jonathan Smyth

    Hi, your script was a godsend for me – previously we were just giving people full access permission to leavers’ mailboxes because it was such a pain to grant reviewer access.

    The only issue I had with your PowerShell script was that it threw an error when applying a permission to the Top of Information Store. That’s because the script was trying to run the command
    Add-MailboxFolderPermission -Identity alex.heyne:Top of Information Store -User Alan.Reid -AccessRights Reviewer
    where it should be
    Add-MailboxFolderPermission -Identity alex.heyne: -User Alan.Reid -AccessRights Reviewer

    So I modified your script as follows:

    #Proof of concept code to apply mailbox
    #folder permissions to all folders in
    #a mailbox (including Top of Information Store)

    param (
    [Parameter( Mandatory=$true)]

    [Parameter( Mandatory=$true)]

    [Parameter( Mandatory=$true)]

    $exclusions = @(“/Sync Issues”,
    “/Sync Issues/Conflicts”,
    “/Sync Issues/Local Failures”,
    “/Sync Issues/Server Failures”,
    “/Recoverable Items”,

    $mailboxfolders = @(Get-MailboxFolderStatistics $Mailbox | Where {!($exclusions -icontains $_.FolderPath)} | Select FolderPath)

    foreach ($mailboxfolder in $mailboxfolders)
    $folder1 = $mailboxfolder.FolderPath.Replace(“/”,””)
    $folder2 = $folder1.Replace(“Top of Information Store”,””)
    $identity = “$($mailbox):$folder2”
    Write-Host “Adding $user to $identity with $access permissions”
    Add-MailboxFolderPermission -Identity $identity -User $user -AccessRights $Access

    and this does the trick. Thanks again!

  60. Joe

    Nevermind on the above question! I was able to get it to work with a “set” rather than a “update”

  61. Joe

    I tried to update the “add” folder permissions of your script, so that it “update”s the existing permissions rather than trying to add permissions when an account already exist’s with different permissions. When I try to use the Update command it seems to break the script though, any suggestions?

  62. hedi


    great script 🙂

    i use it in exchange 2013, are this error is normal:

    The operation couldn’t be performed because ‘test.mailbox:Top of Information Store’ couldn’t be found.
    + CategoryInfo : NotSpecified: (:) [Add-MailboxFolderPermission], ManagementObjectNotFoundException
    + FullyQualifiedErrorId : [Server=mailboxserver1,RequestId=44d1cd48-8a1b-46ae-bcf6-fda199f2be50,TimeStamp=13/10/2014 10
    :32:20] [FailureCategory=Cmdlet-ManagementObjectNotFoundException] B52CDE40,Microsoft.Exchange.Management.StoreTas
    + PSComputerName :

    and this error:

    The operation couldn’t be performed because ‘test.mailbox:Calendar Logging’ couldn’t be found.
    + CategoryInfo : NotSpecified: (:) [Add-MailboxFolderPermission], ManagementObjectNotFoundException
    + FullyQualifiedErrorId : [Server=mailboxserver1,RequestId=6097ea46-ae18-402c-b424-3f71cdaeccf9,TimeStamp=13/10/2014 10
    :32:32] [FailureCategory=Cmdlet-ManagementObjectNotFoundException] 42945040,Microsoft.Exchange.Management.StoreTas
    + PSComputerName :

    thanks for help

  63. Aditya Mendiratta

    is this possible to give someone read-only access to another user’s mailbox only for OWA and not for outlook ?

  64. Manoj

    Hi Paul,

    I am facing a issue in providing shared mailbox access to all users in my domain . My shared mailbox to be visible to all users but they should only have reviewer access. Only admins should have full mailbox access. Can you please help me in this…

  65. Ken

    How about a reversal of this command, removing all Read-Only Access

    1. Avatar photo
      Paul Cunningham

      As a general rule for Exchange and PowerShell, when you see an Add-* cmdlet there is a corresponding Remove-* cmdlet.

      1. Ken

        was actually looking for something similar to the script .ps1 script above but what it does is to remove.

        thank you

        1. Avatar photo
          Paul Cunningham

          Yep, I understand that. I’m encouraging you to tackle it as a learning exercise 🙂

          The script example above is pretty simple. If you look at the code you can see the step where it gets the folder list, then you can see where it loops through each folder adding the permissions. The same process could be used to remove permissions as well, by changing from an Add-* to a Remove-*.

          You might need to copy/paste the code into the PowerShell ISE to see it properly with all of the normal syntax highlighting.

          Give it a test run on a test mailbox before trying against any prod mailboxes.

        2. Ken

          Thank you, still a noob at this.

  66. felix

    Hi Paul,

    thanks for your response. This is happeneing to both users still in exch 2010 and 2013.

    nice weekend.

  67. felix

    Hi Paul,

    I have a outlook 2010 client having disconnected from exchange 2010 server, ie keeps prompting for outlook password (same as the domain credentials) and even he enters his correct password, it keeps prompting (even after resetting the password). What I did was created another outlook profile under control panel, mail and then restart the outlook and now it can get connected to the exchange server, but the issue is, the user’s emails in inbox and folders on his initial profile are not updated (synchronized) with this new profile. When we connect using the initial profile, the mails and the folders are all there but are not updated in his new profile here. His outlook is cached.

    Any workaround or fix to this issue please.

    thanks, felix

    1. Avatar photo
      Paul Cunningham

      Your questions have nothing to do with this particular article. You’ve got a connectivity issue and by the looks of things it has something to do with your earlier comment of moving the mailbox to 2013. My best guess is that you’ve not set up your Exchange 2010/2013 co-existence correctly.

      So you might find some tips here:

      Or in the Exchange Deployment Assistant:

      Or if you’re still stuck, there is also the TechNet forums.

      But please don’t post unrelated questions on random articles here.

  68. felix

    Hi Paul,

    I have successfully moved a user mailbox from server 2010 – 2013 and after that his outlook is disconnected, unable to connect to the exchange server. I have tried some tips but still no luck, any idea?

    thanks, felix

  69. joakim

    Nice tips.
    If I grant preview rights as you describe. will previous added users with granted full access still work or will this mess upp theirs access to the mailbox?
    I, mean do I need to do the same for all users in powershell?

    Have a nice weekend.


  70. Jason

    I’m going to 2nd the question about granting the mailbox owner read only access. I have been asked for this a few times and so far the only thing I’ve come up with is connect the mailbox to another AD object, then grant the original user’s AD object read only access using Paul’s process above.


    Also want to give Paul a great thanks for this site, very useful, very profesional.

    1. Avatar photo
      Paul Cunningham

      Exchange isn’t designed to limit a user’s access to their own mailbox. You can lock down protocols but that isn’t what you’re asking here.

      Your solution would work.

  71. Avatar photo
    Paul Cunningham

    “I am the admin so I have his Windows login credentials”

    No, wrong approach.

    Adding the email account using their credentials means you are authenticating as them, which gives you full access to the mailbox.

    Grant yourself read only access (following the steps shown in the article above), then add their mailbox as a secondary mailbox in your Outlook profile, not as a secondary email account.

    The steps to perform that in Outlook are available here if you need more details:

    1. John Gordon

      In my situation, as the Exchange 2010 Admin I need to periodically manage meetings for our senior people. Most of the instructions come from the Outlook client direction, but I would like to be able to do that centrally either through a PS script or the management interface.

      Could a script be written that would
      -Grant access
      -Change Meeting and send updates to all participants
      -Remove access

      I would prefer not to log in to their accounts directly.

      Any help is appreciated.

      1. Avatar photo
        Paul Cunningham

        1) Yes, simple PowerShell script could be written to grant access. Really it is a one-liner anyway.
        2) Yes, not with Exchange management cmdlets but with Exchange Web Services
        3) Yes

        But I think you may be over-thinking this. If your job involves managing calendars for other people just make yourself a delegate for those mailboxes and you’ll have calendar management permissions.

        1. John Gordon

          I was able to do this by granting the Editor permission

          Add-MailboxFolderPermission -Identity USERID:Calendar -User USERGRANTTOID -AccessRights Editor

          .. then opening the calendar in my Outlook and doing the change/update.

          I then removed the permission using the Remove-MailboxFolderPermission command.

          Would you be able to post an example script that I could customize to my environment, or is that beyond the scope of this thread?

        2. Avatar photo
          Paul Cunningham

          A PowerShell script is basically just a series of PowerShell commands. You’ve already worked out the commands you need to run, so turning that into a script is a pretty trivial task. If it is your first time writing a PowerShell script then it will also be a good learning exercise.

  72. felix

    Hi Paul,

    I want to have access to someone’s emails and would only like to have READ only permission, I do not want to accidentally delete any mails. So from my outlook, I go to Files–>Account Settings–>Account Settings..–>E-mail ..New and add the email of the user, I am the admin so I have his Windows login credentials. After this, the user’s mail box is added under my outlook. Now I want to set READ only permission on this mail box, how can i do this?

    I have tried right click on the mail box, Properties–>Permission add myself and give permission level as Reviewer BUT this does not seem to work. I can still delete mails under his inbox.

    Please advise.

    thanks, Felix -2014

  73. Tim

    Hi Paul.

    Sorry to bother you.

    I have an organization where they need 50-70 users added as reviewer to a mailbox (We’ll call it eData)

    I am not 100% certain which fields of text I am supposed to change.

    Am I supposed to change:

    param (
    [Parameter( Mandatory=$true)]

    [Parameter( Mandatory=$true)]

    [Parameter( Mandatory=$true)]

    to something or am I supposed to change

    foreach ($mailboxfolder in $mailboxfolders)
    $folder = $mailboxfolder.FolderPath.Replace(“/”,””)
    $identity = “$($mailbox):$folder”
    Write-Host “Adding $user to $identity with $access permissions”
    Add-MailboxFolderPermission -Identity $identity -User $user -AccessRights $Access


    I just don’t want to mess up a mail server related to a medical related organization.


    1. Tim

      Oh, an I am using Exchange 2010 in that org.

      1. Avatar photo
        Paul Cunningham

        The short answer is that the Add-MailboxFolderPermission command would need to be looped through a list of users instead of just run against a single user.

        I’ll try and find time to expand the sample code to demonstrate that but for now that should give you enough to Google/Bing on.

  74. Jeremy

    Too bad there is no way to give Read Only permissions and have it appear in the users folder list automatically. We have 20+ people who need read only and are computer challenged 🙁

  75. Rod

    Great article, do you know how the command should look like if I were grant Read-Only permission for the user itself.
    E.g so the user cannot delete nor change a contact from his own contact list.

    I tried this with no luck
    Add-MailboxFolderPermission -Identity john.doe: -User john.doe -AccessRights Reviewer
    Add-MailboxFolderPermission -Identity john.doe:Calendar -User john.doe -AccessRights Reviewer

  76. Chris

    Hi Paul,

    Thanks heaps for the article, very informative and straight to the point!

    There is one aspect that still a bit unclear to me – do I need to grant the users Reviewer acces rights on the Top of the IS before running the script or granting them Reviewer access on certain folders?

    I did it anyway, but it would be good to know for future reference!

    Thanks in advance for your answer!



    1. Avatar photo
      Paul Cunningham

      Yes, I believe that permission at Top of IS is required for them to be able to open/expand the mailbox in their left-side Outlook pane.

  77. Brett

    Hello Paul,

    Can you point me in the right direction on how to give a user ‘Delegate’ access say with ‘Author’ rights to ALL folders and subfolders?
    This has been a thorn in my side for some time. When these requests come up, I have to go into each subfolder individually and apply permissions. I have one now with 100’s.!
    Your assistance or direction would be much appreciated, Thank you.

  78. aldwin nabua

    Hi Paul,

    Im trying to reverse the code but i’m receiving error.

    A positional parameter cannot be found that accepts argument ‘-AccessRights’.
    + CategoryInfo : InvalidArgument: (:) [Remove-MailboxFolderPermission], Para
    + FullyQualifiedErrorId : PositionalParameterNotFound,Remove-MailboxFolderPermission

    can you help me out on this?

      1. aldwin nabua

        The script for adding permissions to all folders … except that had changed the Add-MailboxFolderPermission to Remove-MailboxFolderPermission

  79. Ed

    Paul – first and foremost – thank you for providing MANY useful scripts and advice over the years… I have the need to remove the read-only permissions that were set by your example script above. Kindly reply back with a solution/reverse script, it would be most appreciated.

    Thanks in advance

    1. Avatar photo
      Paul Cunningham

      Add-MailboxFolderPermission is the cmdlet doing the heavy lifting there. So the reverse action is Remove-MailboxFolderPermission.

  80. Mark

    Thanks Paul,

    This issue was causing me a problem and a headache had a few users who wanted to grant view only access to the inbox sub folders without giving them access to the inbox itself. Needless to say script has been saved and I have since joined and will no doubt be catching up on more of your articles.


    1. Purushothama

      Mark, If we provide Read only access to the Inbox sub-folders. other user can’t access Sub-folders .Beacuse , we don’t have option. We have only option to “Inbox,sentitems, calendar…..etc” . No sub-folder.

  81. Matthew Procter


    This works great for Exchange 2010. How can you do the same in Ex2007?



    1. Avatar photo
      Paul Cunningham

      Looks like the Add-MailboxFolderPermission cmdlet isn’t available in Exchange 2007.

  82. ByteMan

    OK, I have researched a new issue, per request from Administration.
    Exchange 2013 with Outlook 2010.
    The user has a mailbox on the Exchange 2013 server.
    This user likes to change the appointments made by the scheduling staff.
    Is there a way to make the user’s own calendar read-only?

    I only come to the conclusion that the answer is no.

  83. Navneet Gupta

    Hi Paul,

    Thanks for this, but i am in the situation where you can pull me out.
    The thing is my requirement is exactly same, But i only need y user can see all the folder in inbox and inbox as well, except junk email,contacts,sent items etc and when i add the x account in y outlook. i cannot able to expand the folders. that is because on the root account i haven’t take permission. So please tell how can take permission on root as well as all folders in inbox including inbox folder.except all i want to put in exclusions…

    I used below command : but still my requirement not succeed.

    ForEach($f in (Get-MailboxFolderStatistics X | Where { $_.FolderPath.Contains(“/Clients”) -eq $True } ) ) {
    $fname = “X:” + $f.FolderPath.Replace(“/”,””);
    Add-MailboxFolderPermission $fname -User Y -AccessRights Reviewer }

    Any help really appreciated

  84. Dimitri

    Excellent article.

    So the user who received the reviewer access will always have to go to File | Open or is there a way that the inbox can be diplayed as an additional mailbox (similarly when you give full mailbox access) but with only the inbox showing?


    1. Dimitri

      No need to answer this. It just hit me. Add the account from the Account Settings – Thanks.

  85. Roberto

    Great article.
    I have an issue.. I can set the Reviewer access, but it also lets me do a ‘replay’ on the message..
    It’s there a way to prevent the users from replying to the messages?


    1. Roberto

      I meant “Reply” not “Replay”

    2. Fedor

      I’d love to hear the answer too.
      Any way to block Reply and Forward feature for read-only mailbox?

      I’m thinking on doing RMS instead.

  86. Kottees

    Again Good one Pual, thanks for sharing 🙂

  87. Manuel Pombo

    Great tutorial and script.
    In my organization, however, it only works if I give the user FullAccess with Add-MailboxPermission. Anything less just returns a ConnectionFailedTransientException in OWA.
    Any idea why? Already installed CU3, but the issue remains.

    1. Avatar photo
      Paul Cunningham

      I see the same on my CU3 lab. Let me see if I can find out some more and come back with an update in a day or two.

      1. Ilke Cetin

        Hello Paul,

        Do you have any update regarding working these permissions on OWA ?

        Everything work properly on Outlook, but on OWA I cant even open the box without full access.

  88. vince.whiston

    Is there a parameter to stop the items being marked as read when another user access them?

    1. vince.whiston

      to expand like in public folders option ‘maintain per-user read and unread information’.

      Excellent article by the way thank you

      1. Avatar photo
        Paul Cunningham

        No I don’t think so, but users can configure Outlook to behave that way.

  89. Simon McAuley

    Hi Paul, great blog as usual. I’m trying to grant Reviewer Access only to a sub folder of a user’s inbox. No other folders or email should be seen or if they are no emails are shown. Is this possible or is the minimum access level you can set “Read Only” and therefore “Reviewer”

    1. Simon McAuley

      Actually think I figured it out. You need to either move the sub folder onto the same level as the Inbox or you allow the user to see your inbox plus this folder.

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        Paul Cunningham

        “FolderVisible” would be the minimum required to let someone traverse a folder hierarchy without seeing the items within.

        1. Simon McAuley

          Thanks Paul, didn’t even know “FolderVisible” was an option! In our scenario what your blog said was perfect as we don’t want them to be able to see any other folders.

  90. Aron Rose

    Great article, any idea how to make the user with reviewer permissions not be able to mark email as read?

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      Paul Cunningham

      No. Not sure that is even possible. You can control that behaviour with Outlook settings though.

  91. TechBajan

    I have to say that this is probably the most useful site on the Internet! Many times I’ve been stuck with an issue and you’ve written about the EXACT issue and always seem to have the right solution.

    Your blog is amazing and continually helps many an Exchange admin.

    1. ExchangeLove

      I agree this site is the best! It has saved my butt many times. His e-books are really good too!

  92. Larry Michaels

    I had a problem where e-mails were being deleted from a shared mailbox inbox and was tasked to stop the e-mails from being deleted – GUI & retention policies did not work. I read that retention policies only work with powershell but could not get that right.
    This site helped with an easier way and it worked. I did not need to use script to populate the entire mailbox – just the top of the information stoe & inbox.
    There was a problem where I had the users that were supposed to be blocked in the ‘Manage Full Access Permission’ option – removing them then the powershell commands worked..
    Thank you

  93. Itworkedinthelab

    Thanks for sharing

    1. Gary

      Would this apply to Office 365 mailboxes also. How would you do this for Office 365 mailboxes. A couple of people need to see all mailboxes but not delete anything.

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