http://technet.microsoft.com/en-us/library/bb332342(EXCHG.80).aspx

Backup Exec by default will report a failed backup if corrupt files are encountered. Backup Exec also sees open files ie. QuickBooks databases that are open when the backup is running as a corrupt file. If you want to disable this in Backup Exec, go to regedit and modify the following registry entry from 1 to 0: Fail Jobs on Corrupt Files

HKEY_LOCAL_MACHINE\SOFTWARE\VERITAS\Backup Exec\Engine\Backup

http://seer.entsupport.symantec.com/docs/193940.htm

Situation: Exchange 2007 has a contact (not a mailbox) within the GAL that end-user uses to email instead of using the actual non-exchange email address. The non-exchange (network solutions) user does not get attachment sent (Word, Excel, etc.), but does get a winmail.dat file attached.

Fix: Launch Exchange Management Console, goto Recipient Configuration/Mail Contact container, open up contact you’re having the issue with, on the ‘general’ tab change the ‘Use MAPI rich text format’ drop-down to ‘Never’ and test.