Microsoft spins Rotor tools update.. InfoWorld: Microsoft spins Rotor tools update. [Hack the Planet]
There's a great quote in this...
The main reason [for the submission] had to do with overcoming the customer perception that Microsoft is somehow entirely built on proprietary standards.
So its about submitting just the language part of the .Net platform in a form that
"It isn't [for] commercial products. It isn't something you would normally use to develop applications on. It's more of an educational and research-oriented thing," Murphy said.
So not very useful or interesting then. OK so Microsoft might not be entirely built on proprietary standards; just mostly.