Hey,

I was running test migration form one forest to another. The migration have not finished successfully. I removed the mailbox form target org and tried to re-run the migration.

I'm getting the following error:

Error: MigrationTransientException: Couldn't switch the mailbox into Sync Source mode.  This could be because of one of the following reasons:   Another administrator is currently moving the mailbox.   The mailbox is locked.   The Microsoft Exchange Mailbox Replication service (MRS) doesn't have the correct permissions.   Network errors are preventing MRS from cleanly closing its session with the Mailbox server. If this is the case, MRS may continue to encounter this error for up to 2 hours - this duration is controlled by the TCP KeepAlive settings on the Mailbox server.  Wait for the mailbox to be released before attempting to move this mailbox again.

Is there a way of cleaning up source mailbox, so I could re-run the migration?

Thanks!

Does this help?

http://powershellatwork.blogspot.com/2012/12/mailbox-move-errorcouldnt-switch.html

Thanks! but no, this is different error..

I ran few other migration w/o any issues..

I have just one "stuck".. Something on source org.. It thinks that mailbox is being moved..