http://mobile.extremetech.com/latest/222953-would-microsoft-really-open-source-windows?origref=

At ChefCon, Microsoft Technical Fellow and top engineer Mark Russinovich dropped a bombshell in front of several hundred people that use Chef, an open-source website management tool: He said that Microsoft one day could “open source” the entire Windows OS–in other words, give the code away for free. Cue jaws hitting the floor across the tech community.