Windows Code for the Taking

Wired.com:Internet users on Friday were ferociously downloading pirate versions of Windows source code, stoking concerns hackers and virus writers could use it for a new wave of cyber attacks.

Microsoft alerted the public on Thursday that parts of its valuable source code for its Windows NT and Windows 2000 operating systems had been leaked to various online file-sharing networks.

So basically Microsoft just told everyone here it is it's available come and download it! If they had the code how did it end up on the p2p networks?