I am currently the owner of the domain name WindowsLogo.com, which was previously owned by Microsoft. Estibot put the value around 11.000 USD, but I am not quite sure if that is correct (maybe higher/lower). It is a time-less domain, as long as Windows is out there, this domain contains pretty good value I think.
Age: 16 yrs old
Searches: 450.000 monthly (broad)
The fact that you even wrote the above quotes shows that you are knowingly violating Microsoft's TM's. Microsoft's lawyers are on this forum and will certainly read this post. I am no lawyer, but based on experience I can tell you that you are messing with something that isn't worth it. I promise you this. The best thing you can do is contact Microsoft's lawyers at the firm K&L Gates and tell them you would like to give them the domain name.
Oh and as far as value goes.... its a big, big, BIG LIABILITY!!! Don't be stupid.