OK. Its still a little vague but I'll speculate. I could do with some more detail about the problem. When you say freezes, do you mean the machine hangs and needs rebooting or is it temporary. If its a temporary problem - do you have the yellow lighting symbol in the bottom left showing that its doing something - i.e. replicating. I assume everyone connects to local server(s) on the same lan and that internet mail goes through the server. Check in the users location documents (File, Mobile, Edit current location) that internet mail is sent via the Domino server and not directly to internet. Also, what ports are enabled in the location? If the machines respond again after freezing , check the log to see what the last thing(s) it was doing. (The status bar)