I have successfully migrated over 100 mailboxes from Ex2007 to Ex2013 with no issues. I have one mailbox giving me a tonne of grief. After the migration from 2007 to 2013 the wizard did report the migration completed successfully. However, when the user opens the inbox using her Outlook 2007 client she is able to compose and send emails. Any recipients of her emails are not able to reply to them. Same goes with any emails this user receives, she is not able to reply to them.
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