Migrating mailbox from Exchange 2007 SP2/SP3 to Exchange 2010 SP1

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When you attempt to migrate a mailbox stored on Exchange 2007 to Exchange 2010, you receive the below errors:

Error occurred in the step: Preparing mailbox to be moved. Failed to copy basic mailbox information with error:  A duplicate mailbox was found due to problems during a Move Mailbox procedure. The duplicate mailbox has been deleted.
Try again later., error code: -1056749241


Error occurred in the step: Opening destination mailbox. An internal processing error due to a bad parameter has occurred.
Try restarting the Exchange System Manager or the Microsoft Exchange Information Store service, or both., error code: -1056696538

Logon to Exchange 2010 server and move the mailbox from there. Works without errors.

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