The CPUU log contains the message: Switch message was not found..
The Mail Source Agent (MSA) log reports that the mailbox has been switched and that the hidden message has been written into the mailbox. The console indicates that the mailbox has been switched as a green checkmark is displayed next to the mailbox.
A manual unswitch and switch of the mailbox works with no errors. An investigation of the EMWMigration.log revealed that there were no errors and that the switch message was written to the source mailbox.
A check of the source mailbox with MFCMAPI confirms that the hidden message has not been posted or written into the mailbox.
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