Ben Patterson - Microsoft proclaimed Monday that it was back in the smartphone business, unveiling snazzy new handsets from HTC, LG, and Samsung that boast jumbo touch displays, speedy processors, HD video recording — and, most important, Redmond's completely revamped mobile OS, the touch-friendly Windows Phone 7. But will its rebooted platform be enough to get Microsoft back into the game against the likes of Android and the iPhone? That's the question of the hour.More...