Un-switching a user in a mail sync collection (MAgE) fails however targetAddress property is successfully updated (4258262)

When attempting to un-switch a user that is in a mail sync collection (MAgE only) the console will report that the un-switch failed.  Checking the user's targetAddress property in Active Directory, will show that the attribute was successfully updated. 

The EMWMigration.log file will, in this case will show the following:

MMExViewCore|Quest.MigrationManager.Exchange.View.DoActionViewItem.OnComplete     Message: OnComplete:Failed to Unswitch user. The operation is pending. Mapi logon failed. Unable to cast COM object of type 'System.__ComObject' to interface type 'System.IDisposable'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{805D7A98-D4AF-3F0F-967F-E5CF45312D2C}' failed due to the following error: The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)

Attempts to use MFCMAPI on the console server while logged in with the service account will successfully open the user's source mailbox in this case as well.