Microsoft has started a Microsoft Employee Whitehat hacker blog.
"Welcome to a new blog from Microsoft. The focus of this blog is likely
to be a little different from most other blogs you'll see on
blogs.msdn.com. Microsoft employs some of the best hackers in the world
and actively recruits them and develops them. They work on all kinds of
projects, whether it be in development, research, testing, management
and of course security. Of course, there is controversy even in the
word "hacker" but I don't think that should stop us from using it in
the manner I think is the most appropriate."
Paper Link: http://blogs.msdn.com/hackers/