I'm not sure if it's still true for Windows 7, but I remember that XP also used some BSD code in the network stack. The challenge shouldn't really be eye openin

I'm not sure if it's still true for Windows 7, but I remember that XP also used some BSD code in the network stack. The challenge shouldn't really be eye opening. Free working code will make its way into many pieces of software. Your second challenge is more interesting, as it may illustrate the effect of using more restrictive copyleft licensing in terms of code reuse.