It looks like Microsoft has finally understood that they are only a part of the .NET ecosystem. They used to think that every single .NET piece must come from them which is not obtainable and doesn't bring any value. But recently I've seen a few blog posts (for example Scott Guthrie) and a few podcasts (for example Daniel Simmons) where Microsoft employees freely mentioned OpenSource projects and how they fit into what Microsoft is trying to achieve. At last.