I use Veritas Backup Exec to backup the Exchange server 5.5 (they are all installed on the same machine). There is no problem to backup everything except the mailboxes. The error message is "Unable to attach to mail boxes." I searched for the possible solutions from the MS Website and found an article saying that Exchange server and Outlook 2000 or higher client on the same machine are not supported (Q266418). Then, I removed Outlook 2000 from the machine but it's still not working.
This situation is described in the Veritas technical document at
http://seer.support.veritas.com/docs/229917.htm. You have followed the procedure outlined in this document. Since it did not resolve the problem for you, I think your best bet is to contact Veritas.
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