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Removed Default or Anonymous permission for Outlook folders can't be restored in an Exchange Server 2013 environment

Original KB number:   2983066

Symptoms

After you remove the Default or the Anonymous permission from a Microsoft Outlook folder in an Exchange Server 2013 environment, you can't add the permissions back by running the Add-MailboxFolderPermission cmdlet in Exchange Management Shell (EMS).

Note

When you run the Add-MailboxFolderPermission cmdlet to add the permissions back, the result indicates that the operation succeeds. Actually, when you run the Get-MailboxFolderPermission cmdlet, the permissions are not added as expected.

Resolution

To resolve this issue, install the following cumulative update:
Cumulative Update 6 for Exchange Server 2013

Note

We don't recommend removing the Default or the Anonymous permission from an Outlook folder.

Cause

This issue occurs because the Add-MailboxFolderPermission cmdlet doesn't set the Access rights parameter correctly.

Status

Microsoft has confirmed that this is a problem.

More information

By default, the Anonymous and the Default accounts have the Access rights parameter set to None on every folder in an Exchange Server 2013 mailbox.

Here is a sample of the result when you run the Get-MailboxFolderPermission cmdlet for default settings in EMS:

[PS] C:\>Get-MailboxFolderPermission usermbx:\inbox
FolderName User AccessRights
---------- ---- ------------
Inbox Default {None}
Inbox Anonymous {None}

References