From the Micro dept.:
Back in July, Microsoft announced it was making .NET available under its Community Promise, which in theory allowed free software developers to use the technology without fear of patent lawsuits. Unsurprisingly, many free software geeks were unconvinced by the promise (after all, what's a promise compared to an actual open licence?), but now Microsoft has taken things to the next level by releasing the .NET Micro Framework under the Apache licence. Yes, you read that correctly: a sizeable chunk of .NET is about to go open source.

tuxradar.com