Backupexec 2010 on SBS2008 Fails

I have an annoying problem with a SBS2008 with Backupexec 2010.
I backup up to external NAS.
Every night the backup fails with an Exchange Server error (at least I think it is Exchange)
V-79-57344-34070 AOFO: Initialization error on Microsoft Information Store.
Resources specified for snapshot do not have any valid data on them. Check if files were deleted or renamed.

The only article from Symantec is this:

But when running the VSSADMIN LIST WRITERS there is NOTHING wrong with the writer status of Exchange ???

Any suggestions?
Who is Participating?
Tony JConnect With a Mentor Lead Technical ArchitectCommented:
Any chance this is a possibility?

Also - not sure it's relevant as Symantec often puts strange things into the error messages but why does it appear to be using the advanced open file agent (AFOA) to backup Exchange stores?
Shreedhar EtteConnect With a Mentor Commented:
Check the application event log for any errors related to VSS.
OhmitAuthor Commented:
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