http://www.networkworld.com/news/2011/070611-microsoft-android.html

You may already know Microsoft has forced five Android vendors to pay royalties each time they ship a device, and is suing Motorola and Barnes & Noble in cases that claim Android steals Microsoft intellectual property. Exactly which patents are supposedly violated by Google's Android mobile OS? Microsoft isn't revealing the details in cases settled without a lawsuit, but court documents cases against Motorola and Barnes & Noble detail more than a dozen patents Microsoft claims Android devices violate. Here's a look.