This is great and from MS:
"The software industry remains extremely competitive, and open source software offerings vie with commercial software. Microsoft competes with rival offerings regardless of whether or not they are commercial or open source in nature. Competition with open source software should not be seen as an attack on open source or on those who choose to develop under that model. In a sense, we are agnostic on this topic; we believe we can provide customers with the best software solutions to meet their needs, period. Even in discussing the GPL, which is widely seen as controversial, I assert that we need to move from the pejorative to the substantive.
Commercial vendors do more than sell products; they also deliver value. If any company's product ceases to deliver value, no matter what development model was used, the market will exercise its ultimate power: not to buy."
What's more they mentioned that MS has GPLed stuff - modifications to GCC. Sometimes I wonder if MS suffers from whiplash the way it's messages changes from cancerous Linux to a vital part of the software development community.