Nearly had a stroke when I read this.
ms is releasing the source to hyper-v technology back into the GPL:
http://arstechnica.com/microsoft/news/2009/07/microsoft-aims-at-vm-market-with-linux-kernel-code-offering.ars
http://community.zdnet.co.uk/blog/0,1000000567,10013240o-2000331777b,00.htm

Shrewd move!
Good on em!