We discovered an problem today with our exchange server. The information store either stopped or crashed and I couldn't mount the mailbox stores.
I rebooted the server and it hung at applying computer settings. I rebooted again and into safe mode and disabled all exchange services. I was able to boot finally. Still cant get any exchange services started especially the system attendant.
Microsoft thinks its a problem with our DC's since some of the error message stae things like cannot pull information from dc. Very strange. This strated about 3:00 AM and we haven't installed, updated, or changed anything on our exchanger server. This is our only exchnage server.