Setting up Windows 2003 Server

My old server is Windows 2000, and the new server that I’m setting up is a Windows 2003 SBS R2.

This morning, I migrated one user over(for testing), and took the old server off line, and put the new server on line. I went to a workstation, logged on as the administrator, changed the domain, logged off, and then back on as that user. I changed Outlook 2003 to point at the new server, and I am able to send/receive emails. That seems to be working, but, i cannot get the internet to work from the workstation.

Is there special permissions or group policies that I need to setup on the new server?

Thanks in advance for you help.