Windows Phone 7 Series

During the Mobile World Congress 2010 in Barcelona, Microsoft revealed details of Windows Phone 7 Series
In a nutshell, Xbox Live games and Zune music are now features of Windows Phone 7. These phones arrive by holiday 2010 (may be it's too late).

With the specification requiring all Windows Phone 7 Series devices to feature three buttons, Back button, Start button and Search button. On the other hand, HTC released three new phones and proclaimed the company's commitment to Windows Phone 7 on Tuesday (Feb 16, 2010).

About hardware requirements, No mention has been made of the underlying hardware, although in one of the videos on the Series 7 YouTube page, a Qualcomm representative talks about its Snapdragon chip, a 1GHz ARM-based chip that currently powers Google’s Nexus One.

Windows Phone 7 Series
Windows Mobile
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A 22 minutes demo about Windows Mobile 7

Windows Phone 7 Series