I have been unable to backup my Exchange 2007 SCC using BE since day one (Windows Backup works).
I have opened two tickets with Symantec on this issue. The reason I have had two tickets is because they take their sweet time getting back to me and automatically close the ticket after a few days of "inactivity" - not on my part of course.
At the instruction of tech support I have installed BE service packs, hotfixes, redeployed agents, uninstalled them and redeployed again, regressed service packs, manually registered .DLLs, uploaded my configuration via FTP, and sent job logs countless times.
Finally, about a month ago they just gave up altogether (not that it seemed to be a whole-hearted effort to begin with) and blamed my problems on Exchange. They claimed (but were unable to prove to me) that Microsoft had a bug in VSS and told me it would be fixed in SP1 for Exchange, and again closed my ticket.
Well, today SP1 shipped and I have installed and tested and BE still doesn't work. It is unacceptable to me to poke the finger at another vendor when after I have been sold a product that is supposedly designed for that vendors product and for which I am paying support on. I am sick of being marginalized by tech support so I have decided to gradually abandon BE over the next several months.
Just in case anyone is curious as to how - I have already begun migrating to Microsoft DPM 2007 - which is doing a pretty fantastic job so far. Little bit of a learning curve on it but I expect that.
Best of luck everyone.