Windows Phone 7 Series. Get used to the name, because it’s now a part of the smartphone vernacular… however verbose it may seem. Today Microsoft launches one of its most ambitious (if not most ambitious) projects: the rebranding of Windows Mobile. The company is introducing the new mobile OS at Mobile World Congress 2010, in Barcelona, and if the press is anything to be believed, this is just the beginning. The phone operating system does away with pretty much every scrap of previous mobile efforts from Microsoft, from the look and feel down to the underlying code — everything is brand new. 7 Series has rebuilt Windows Mobile from the ground up, featuring a completely altered home screen and user interface experience, robust Xbox LIVE and Zune integration, and vastly new and improved social networking tools.