It’s the President’s Day holiday here in the U.S. today, but over in Barcelona, the Mobile World Conference is buzzing. Microsoft unveiled a new version of Windows Mobile now rechristened Windows Phone, which it hopes will give it a fresh start in a market where it has stumbled badl. Adobe announced it will release Flash Player 10.1 for smartphones, starting with Android phones, in the first half of 2010. Per usual, Apple was not at MWC but its presence was felt nonetheless. An international group of 12 mobile carries, including Verizon Wireless, AT&T, NTT DoCoMo, Deutsche Telekom and China Mobile, announced plans to develop an open applications platform for mobile devices, a move clearly aimed at Apple’s iTunes App Store platform.