To some, Windows 8 is a marketplace failure. But its flop has been nothing compared to Microsoft’s perpetual disaster in getting anyone to use its Windows Phone operating systems. You don’t need to worry about Microsoft’s bottom line though. Thanks to its Android patent agreements, Microsoft may be making as much as $8 per Android device. This could give Microsoft as much as $3.4 billion in 2013 from Android sales.

Microsoft’s most profitable mobile operating system: Android. More>