I was surprised to find this one too, but it was used in a recent lawsuit against Kyocera [1]: http://www.google.com/patents/USRE40989 http://www.google.com/pat

I was surprised to find this one too, but it was used in a recent lawsuit against Kyocera [1]: http://www.google.com/patents/USRE40989 http://www.google.com/patents/USRE40989 That, to me, looks like a solution to one of Bloomberg's interview questions, so it's surprising to me that with a 1999 priority date, Microsoft's lawyers did not find enough prior art to keep it from being asserted. (Generally when you assert a patent, if you're smart, you'll conduct another prior art search to make sure it sticks.) But in general, independent of the quality of the patents themselves, the article [1] indicates that none of those are specific to Windows Phone specifically. 1. http://arstechnica.com/tech-policy/2015/03/09/microsoft-drops-patent-hammer-on-kyocera/ http://arstechnica.com/tech-policy/2015/03/09/microsoft-drop...