I recently deployed a SBS 2003 server primarily as an Exchange server and it is also the F&P server. It worked like a champ for 17 days then it started locking up. By locking up I mean the system is entirely frozen, mouse won't move, keyboard doesn't repsond to CTL+ALT+DEL, HDD stops all activity. I rebooted the machine by holding down the power button and restarted it. It hangs on "applying computer settings" and the mouse would lock up. At the same time I started receiving e-mail from the server that it had recovered from an unexpected shutdown. I restarted the server again without the network cable plugged in and was able to log into the desktop. I plugged the NIC back in and it ran fine for 24 hours and started locking up again. Now it locks up the instant you plug in the NIC. If I disable the Exchange Management, Exchange Routing Engine and Exchange System Attendant services the machine will stay up, get on the internet, run Windows updates, get AV updates, serve it's F&P functions with no problems. I can't find any errors pertaining to these lockups in the system logs and I am stumped. Is there anyway to repair these services?