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Unable to Migrate mailbox to Office 365 - Source Mailbox Already being Moved

When migrating a mailbox from on premises Exchange Server to Office 365, it failed with below error message.


Transient error SourceMailboxAlreadyBeingMovedTransientException has occurred. The system will retry (1/620).


Restarted the Microsoft Exchange Mailbox Replication service and resumed the mailbox move - the mailbox was moved successfully.

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