In an Exchange Server 2010 environment Outlook 2003 users may receive an error message when they attempt to connect to an Exchange 2010 Mailbox server.

Error Message Exchange Server Administrator Blocked the Version of Outlook You Are Using
Outlook 2003 error connecting to Exchange 2010 mailbox

Your Exchange Server administrator has blocked the version of Outlook that you are using. Contact your administrator for assistance.

This error will occur if there are no Public Folder databases in the Exchange Server 2010 organization.

You can resolve the error by provisioning at least one Public Folder database on an Exchange 2010 Mailbox server.

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. Tajinder Singh Panesar

    How do we upgrade to OUTLOOK 2013+

  2. Gary Mobley

    How do I fix this

    1. Danna

      Were you able to fix this? I have the same issue.

      1. Ron

        There is nothing to fix except upgrading your Outlook to version 2013 + service pack and the latest patches or newer versions of Outlook.

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