Hello Experts! I have an SBS 2003 box that I support. I've noticed a number of 9539 events (The Microsoft Exchange Information Store database "First Storage Group\Mailbox Store (CENTRAL)" was stopped.) in the application log for this server. These used to happen at 12:25am, but recently started happening at 8:25am.
In reviewing other SBS2003 boxes that I manage along with regular Exchange 2003, I see that these other boxes rarely see this event.
On the troubled box, it's followed by the rest of the Exchange services shutting down. It takes about two minutes to shut everything down, then it seems to sit there for about 4-5 minutes. After that, event 1000 kicks off (Microsoft Exchange System Attendant is starting. Microsoft Exchange Server System Attendant, service startup complete, version 6.5 (build 7638.1). ) and the remaining Exchange services then all start.