This is a weird one. I had posted this before and thought i had it fixed but nope. What happens is intermittent. Everyone will be running just fine and then boom...outlook goes down.......I try to log onto the exchange server remotely..and I get cannot..rpc server is unvavailable. So I have to go log on locally...when I try to open the system manager..I get an error....as well......when I look at the log files...I get those two errors....in the title. RPC server not working..and no log on server's. I'm not sure why this is happening because my network is fine. DNS is running smooth..but for some reason..my exchange server drops out of the network......suggestions?