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By all accounts, Microsoft is set to unveil it's next-generation mobile operating system, Windows Phone 7 Series (say that 10 times fast!) at Mobile World Congress (MWC) Barcelona today, and WMExperts will be live-blogging the whole thing.

Join Dieter and Phil starting 9am ET, 6am PT, 2pm GT, 3pm CT for all the Steve Ballmer keynote action!