The article is also a little bit of flamebait when it says hotmail is in part run on Linux. All parts of Hotmail run in Windows Server. They use Akamai for cac

The article is also a little bit of flamebait when it says hotmail is in part run on Linux. All parts of Hotmail run in Windows Server. They use Akamai for caching static files such as images - as do many Microsoft services. Akamai reports they use Linux though.