It is a little known fact that Micosoft makes money on some Android devices sold because it own various technologies and patents. Samsung and Microsoft came to an agreement in 2011 where Samsung would pay Microsoft royalties for cross-licensed patents. Analysts have estimated royalties on Android patents bring Microsoft nearly $2 billion a year. Now Samsung has stopped paying royalties and so Microsoft is suing. Samsung says that it will review the case. Stay tuned.
Source: USA Today