No, Microsoft has this Windows Research Kernel they offer to universities and other organizations under a certain strict agreement. This particular site probably has no idea of what access control, or directory access rights mean, so it's easily accessible for anyone.

I would regard this as poisonous in terms of IP.

If you read that code and then contribute to an open source project (or even your own) and Microsoft finds out and tags you as foe, you'll be in a very bad position.