The task "Revoke permissions from public folder ..." for Exchange 2010 fails with the following error:
Public folder user "NT User:S-1-5-21-2712436344-3576784617-3866519510-156852" doesn't exist. A valid public folder user should be a mail-enabled user, mailbox, or distribution group.
It happens because the user that owns this permission has been already removed.
Remove such permissions using the script 'CleanMissedPermissions.ps1' from this link:
- Get the root folder of the customer's organization where this error happens (you can find it in Provider Control Panel on the screen located at Services > E-mail > Organizations > <organization>).
- Place the script on the server with the Mailbox role.
Run it in the following way:
PS> .\CleanMissedPermissions.ps1 -RootFolder "\P000000XXX"
where P000000XXX is the root folder of the customer's organization
- Restart the task.
Note: This may in some cases leave an object in inconsistent state. Please see KB#2247 for details on how to deal with out-of-sync objects.