Hello,
We recommend that you stop the anti-virus during the backup as the files that are accessed by Anti-virus may be accessed by Backup Exec which might cause conflicts
-Please check whether your backups are running when the Exchange maintenance is going on
Please see the technote for more information on this:
http://support.veritas.com/docs/241858
Also check whether the anti virus supports VAPI and MAPI if it does then please change from VAPI to MAPI
Thanks,
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