Viral Video: Windows Phone 7 Series Preview

Mobile news headlines were made at the Mobile World Congress in Barcelona, Spain yesterday when Microsoft unveiled a new version of its mobile operating system: Windows Phone 7 Series.

Microsoft released this preview video to show off the system’s “live tile” interface:

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This video is currently ranked #2 on Unruly Media’s Viral Video Chart with nearly 55,000 views since it was released yesterday.

Microsoft says hardware partners have already started building compatible phones, which are expected to be available in stores this holiday season.