Hi,
Enable restrict anonymous support on the server
How to enable support for "Restrict Anonymous" when using Backup Exec 8.6, 9.x, and 10.x for Windows Servers
http://support.veritas.com/docs/238618
Also check out the following document
How to configure a Microsoft Exchange 5.5 and 2000 individual mailbox backup for Backup Exec 8.x, 9.x or 10.x software
http://support.veritas.com/docs/249456
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