troubleshooting Question

Restore Mailbox from Exchange 2003 to Exchange 2010 using Backup Exec

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I need some help!  I am in the final stages of a migration from Exchange 2003 to Exchange 2010 in same domain.  I have one user who has an extremely large mailbox on Exchange 2003; I would prefer to restore it from Symantec Backup Exec to a temporary mailbox on the new server rather than to submit a "move request" using Exchange 2010 console (to allow the user to take her time pulling only the data she truly wishes to retain from the temp mailbox.)

I have a clean full backup of her Exchange 2003 mailbox, but when I try to re-direct the restore job to the temporary mailbox on Exchange 2010, the restore job fails with error V-79-57344-765, implying a problem with credentials.  However, I am using my account both for the backup and the restore jobs, and my account has full access permissions on both her Exchange 2003 mailbox and on the temporary Exchange 2010 mailbox.  The restore job creates the correct folder structure on the target mailbox, but fails when populating items in those folders, and logs this exact error for each item:

V-79-57344-765 - Cannot set one or more properties for [e-mail subject line].

I am truly stumped by this one and will greatly appreciate any help you can provide!!
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