Singularity: A research OS written in C#

Yes, it's an OS written using managed code with C#.

Here are some videos that illustrate how this idea works and provides some demonstrations of it in action

Singularity: A research OS written in C#

Singularity Revisited

Singularity III : Revenge of the SIP

Singularity IV: Return of the UI

And here is the link i got the videos from it: channel9.msdn.com

This videos are part of a series called: Going Deep which contains many videos illustrating the Internals of Windows, Research projects as well as some future products.

Enjoy it :)