Once SP2 is installed, you can use Windows Server Backup to back up and restore your Exchange 2007 SP2 databases. The new plug-in is delivered in the form of a single executable called WSBExchange.exe. This plug-in is automatically installed by SP2 on all Exchange 2007 Mailbox servers. The plug-in enables Windows Server Backup to be able to make Exchange-aware VSS backups.
Reference Link : http://technet.microsoft.com/en-us/library/ee221172.aspx