Quote:
Originally Posted by JordanPWilliams 
The administrator account being used has full access to the mailbox store in question. That should prove enough credentials for the migration tool, no?
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Receive-As permissions need to be given apart from Full Access. See:
http://technet.microsoft.com/en-us/l.../aa996343.aspx
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When you grant a user full access permissions to a mailbox, that user has full access to only the mailbox for which the permissions are applied. With full access permissions, the user can open and read the contents of the mailbox.
When you grant a user has Receive As permissions to a mailbox database, that user can log in to all mailboxes within that database, but is not able to send e-mail messages from those mailboxes. Also, if you grant Receive As permissions at the storage group level, the specified user can log in to all mailboxes within all databases in the storage group.
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Please upload the log file for investigation.