I was just walking through the hall here at MS an notice a poster with a penguin on it. The first (and correct) thing that crossed my mind what Open Source and Linux. The poster was an advertisment for Port 25 which is a community that offers a look into the Microsoft Open Source Lab.
It doesn't seem that there is a lot going on in the community site right now, but I would expect to see more coming soon. It also appears that the team and Novell are both hiriing.