Microsoft at Mobile World Congress officially launched Windows Phone 7 series, its first major overhaul of its mobile OS in at least five years but also a partial step back. The new platform uses a heavily Zune-influenced design and at the home screen centers on tiles: users can pin apps, contacts, playlists and other details to the home screen. It integrates not just the Zune media player (including Zune software sync) but also Xbox Live's achievements, avatars and friends.
