Okay, I was able to test Windows Server 2003 now. Indeed, it does work, BUT only if you do not install the service pack 2. I did not install service pack 1, but it definitely works without any service pack! DirectX 9 has to be installed, I'm not quite sure whether "hardware acceleration" has to be set to "full" though. After activating 3D acceleration (dxdiag) and "hardware acceleration" you can even play as a client on the server. To my surprise, the onboard SIS Mirage 1 chip works quite okay .