On Monday at the Mobile World Congress, Microsoft unveiled a new version of its flagship smartphone software, which was called Windows Mobile but has now been dubbed Windows Phone.

Steven A. Ballmer, Microsoft's chief executive, took the stage for a few minutes before a demonstration of the new software began.

"We debated a lot about how much we should position and talk about from whence we have come and what we will show you," Mr. Ballmer said. "At the end of the day, we said, ‘Let's get on with the show.' "

The Windows Phone 7 Series has a cleaner look than most of today's phone software, with bright blue icons on a black background. One version of the initial screen has four large, square icons for Phone, People, E-Mail and Text functions that Microsoft calls Live Tiles.

source: nytimes.com