My business here bought Windows 2000 small buisness server - came with Windows 2000 server, Exchange 2000, SQL, and ISA server. The only "microsoft" way to do it that I know of is through ISA server, which would foce all of your computer to go through your server's proxy to get the internet. You need 2 NICs to set that up though. One connected to the Router, and one connected to the LAN. You will have to look up alternate 3rd party ways to do it if you don't have/want ISA server.