Microsoft started its IP licensing program in December 2003 and stated its intention to garner revenue using its mobile patents late in 2010. Since then, it has signed on the dotted line for over 1,100 agreements and continues to seek out customers, competitors and partners interested in using Microsoft owned patents. With its specific Android related IP, Microsoft has signed agreements with some pretty big Android producers such as Samsung, HTC, Acer, LG and Barnes and Noble.
In the second quarter of last year, Microsoft brought in $800 million from royalty payments due it from Samsung and HTC related to Android production. That was higher than Microsoft's Windows Phone revenue in that quarter. HTC is believed to pay Microsoft $10 for each Android phone sold while Samsung allegedly pays $12-13 per Android unit sold.