In order to protect itself from DDoS attacks, Microsoft is using the Akamai service to distribute its load. Ironically, as a result, the domain www.microsoft.com is now listed in the Netcraft report as being Linux running IIS. Netcraft has received so much mail asking about that, and the irony of Linux-bashing Microsoft now depending on "enterprise-class" Linux servers has generated so much discussion, Netcraft has
posted a page explaining what's happening.