"A few days later, an interview with Microsoft President Bob Muglia was published, and he made it clear that they considered C# one of these so-called "patented innovations": …the fact that [GNU/Linux] uses our patented intellectual property [sic] is a problem for our shareholders. We spend $7 billion a year on R&D, our shareholders expect us to protect or license or get economic benefit from our patented innovations. So how do we somehow get the appropriate economic return for our patented innovation…?"
Source: http://www.groklaw.net/article.php?story=20090717043855128