Forum Discussion
Random Exchange Server to 365 migration batch fails with the error "SourceMailboxAlreadyBeingMoved"
I'm running a migration for a small customer (about 400 mailboxes). half of the mailboxes are migrated just a couple of random mailboxes failed with this error. Has anyone faced/worked around this is...
We've had this error a lot lately. Seems to be a backend problem with Microsoft. Try resuming the move request a few times. It may help to delete and re-create it as well. Sometimes we see this error for a few days when resuming the move request...then it will come good. Other times we have to delete it and recreate and we will get a failure straight away, but a few days later it will be fine 🤷
