Windows 2003 Server and Windows XP 64 bit version RTMed today. If you have a machine that came OEM with Windows XP or Windows 2003 server and has a 64 bit CPU, check to see if you qualify for the free upgrade. If you have a machine with the 64 AMD chips and want to play with the 64 bit OS, you can find the trial download of Windows 2003 Server here or the trial of XP here.