Thanks for the information Dave Shackelford. Your explanation is right on the money. That explains why I am able to successfully backup after doing a clean dismount. Do you think that a dismount / remount before using the SBS 2008 backup and its VSS add-in would allow the backup to proceed...
We are using the SBS backup utility using the wizard.
When I am not using this method (for the work-around), I put some Powershell script together to dismount the Exchange 2007 mailbox database, perform the backup using the SBS backup utility, and then re-enabling the Exchange 2007 mailbox...
1) The logs indicated a VSS problem.
2) I opened the 'Microsoft Exchange Shell' and typed in 'vssadmin list writers'
3) Going with the 'vssadmin list writers' result from before I noticed an error:
Writer name: 'Microsoft Exchange Writer'
Writer Id: {76fe1ac4-15f7-4bcd-987e-8e1acb462fb7}...
We have VSS making shadow copies successfully twice daily. When SBS runs the SBS 2008 Backup for the drives, it does not backup the Exchange mailbox databases. As a workaround, I created a script that dismounts the Exchange mailbox databases, performs the backup, and then remounts the databases...
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