BARCELONA--The battle for the mobile consumer is no longer about who has the coolest device, but rather who has the most compelling ecosystem. That's the message from Microsoft CEO Steve Ballmer, who took the stage to kick off this year's Mobile World Congress.
A year ago, Ballmer was here to launch the company's revamped mobile operating system, Windows Phone 7. This year, devices with the OS have been on the market for four months, and the company has about 8,000 apps in its market. Microsoft also just announced a partnership with the world's largest phone … Read more