Actually, there's not a lot Microsoft can do.
- Patent Infringement
That's absurd. All patents are already available to read anyway, you can only infringe on a patent if you implement the idea.
- Copyright Infringement
Unless you distribute the code, it ain't a crime. It's the difference between someone buying a copied CD ina market and the guy selling the copies.
- Trade Secrets
I may be wrong in this but I think that once a trade secret is leaked, it's not a trade secret anymore.