In news that can be filed under "better late than never," 7digital has finally brought its impressive music store to the Windows Phone platform. The company has previously promised a January arrival for its eponymous app, which now offers 18 million song tracks for sale. As you'd expect, it offers shoppers with 30 second previews of each track, and purchased music will automatically sync to one's mobile device. The Windows Phone version of 7digital now joins its Android, BlackBerry and iOS counterpa
