This is not the first time that Redmond company has seen it fit to take a well-worn and engineered solution running on Linux (or even FreeBSD) and put their OS on it. I recall a company here in Singapore called earth9 which was a Linux business from the beginning and when they had a call from MS Singapore to do some work, MS Singapore wanted them to switch out of Linux to their OS and be a case study. That was I believe in 2002 or so. 7 year on, that still continues.
Today we have OpenOffice.org 3.1 gets released. In the meantime, the proprietary product from Redmond claims to be able to wirte ODF format, but fails. Pity. Money corrupts, but MS Tax Dollars corrupts absolutely.