Source -Remember that rumor from over a year ago that said there wouldn't be a Microsoft phone and instead claimed the software giant would push forward a chassis specification? Well, apparently there won't just be one chassis spec that phone makers have to match (or surpass) to be able to put Windows Mobile 7 on their device and get christened under Windows Phone 7 Series; there will be three. The chassis details come to us from the 40-minute Saturday's Frankly Speaking podcast (spotted by ZDNet).
Windows Phone 7 Series to have three chassis