Anyone care to take odds on, when MS's code is finally forcibly released to authorities, some of it is found to be derived from GPL/BSD licensed code?
It's got to be a pretty fair bet that Windows already has some connection to Linux/BSD - it's just not implemented very well... (and let's face it they have to break things just enough to make sure that Windows will only talk to Windows otherwise people might be tempted to start using something else!?).