In addition to the SP1 release of Windows Server 2003 the x64 versions of Windows Server 2003 and XP Professional have been released to manufacturing. These release are for processors including the AMD Opteron and Athlon 64, and the Intel Xeon and Pentium 4 processors with EM64T (Extended Memory 64 Technology).

For more information, see the x64 home page at http://www.microsoft.com/windowsserver2003/64bit/x64/default.mspx