http://blogs.technet.com/mikep/archive/2007/07/01/microsoft-hpc-system-leaps-into-the-top-500-full-datasheet-to-download.aspxLiked this: "I am pleased to see these new Top500 systems based on Windows Compute Cluster Server. The submissions underscore Microsoft’s profound interest in our community and prove that supercomputing can be done on Windows." Prof. Dr. Hans Werner Meuer,en-GBCommunityServer 2.1 SP1 (Build: 61025.2)