While the leak was limited to incomplete portions of the Windows 2000 and NT source code, Gartner research vice president Richard Stiennon told TechNewsWorld that the code is more than enough to enable attackers to punch holes in other Windows systems. "It's sad that [the source code] was released, and it's sad it was written so [badly] from a security standpoint ," he said.
http://www.technewsworld.com/perl/story/32882.html