XADM: Error After Move Mailbox Operation When Client Logged On

The following warning from the Microsoft Exchange Client might appear after a Microsoft Exchange Administrator performs a move mailbox operation:

Your mailbox was moved to another Microsoft Exchange Server in the Microsoft Exchange Site while you were logged on in your Microsoft Exchange Client.

Microsoft Exchange administrators should verify that all clients are logged off of their Microsoft Exchange Server prior to the move mailbox operation. If a user is logged on to the mailbox during the move operation and encounters the above warning, they should exit and loggoff and their client will function normally the next time it is started.

Microsoft recommendeds that mail be sent prior to the move mailbox operation so that users will have fair warning of the impending move.