On February 20, Microsoft announced their intention to remove Application Impersonation for EWS from Exchange Online. If you have existing management role assignments, this article explains how to make the transition to RBAC-based assignments.
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While application access policies were a great step forward, they did not cover all scenarios, and Vasil does a great job at giving us a practical explanation.
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When an Exchange Online mailbox has the ActiveSync protocol disabled, you may find that the Outlook app for iOS and Android mobile devices is still able to connect to the mailbox to send and receive emails.
How to use administrative controls to manage access to Exchange Online by applications that use Exchange Web Services.
Using the Test-OutlookWebServices PowerShell cmdlet to test web services in Exchange Server 2013.
