Server optimization….

I’ve just “inherited” a small network of 3 servers all running NT 4.0. What I need to do is optimize my system for the best possible security and performance. I have 1 server that is my WEB server, another is an SQL server, and the other is my main server which houses all the network applications as well as user data and it’s also my Exchange server.

My network applications are running kinda slow right now. I’m not sure why. I know it’s not the network hardware. I just think the system is bogged down. I have deleted all the files that I can at this time.

What can I do to fully optimize this setup? Should I get a 4th server to run Exchange exclusively? Would upgrading to Windows 2000 server help any?