Windows XP leak confirmed after user compiles the leaked code into a working OS
At this point, a "free to use" license for XP or better yet win2k up to win7, would be worth it for m$ for the PR and goodwill."you can get it if you want it" is just lame.m$ should, ideally, bite the bullet and do a (stripped if need be) source release of what they can, explain what they can't release.  Everyone will then benefit from the relief from worry and lack of friction things like emulation and software archeology and etc will gain.