High Quality Content by WIKIPEDIA articles! Windows Phone Marketplace is a service by Microsoft for its Windows Phone 7 platform that allows users to browse and download applications that have been developed by third-parties. Like much of the new Windows Phone 7 "Metro UI", the UI is presented in a "panoramic view" where the user can browse categories and titles, see featured items, and get details with ratings, reviews, screen shots, and pricing information. The Windows Phone Marketplace was launched along with Windows Phone 7 in Oct 2010 in some countries. It was reported on October 4, 2010 that the Windows Phone SDK has been downloaded over half a million times. As of November 21, 2011, the Marketplace had more than 40,000 apps available.. With the rollout of Mango ( Windows Phone 7.5 ) the online web Marketplace was unveiled by Microsoft, it offers various features like silent over the air installation of apps to the user`s device.