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As you might expected, a new video was leaked on the Internet showing Microsoft Office 15 ‘Moorea’ application wich will come along with the Office. From the video we clearly see that Microsoft will go forward with the Metro UI design, also they show us how they integrated the squares into their application.
Another proof of Metro Design language is the save, undo, redo and close menu, wich is entire from letters, not even an image, wich is close to the Windows Phone 7 UI.
http://www.youtube.com/watch?v=_W5bbrzJrx8&feature=player_embedded#at=18 (http://www.youtube.com/watch?v=_W5bbrzJrx8&feature=player_embedded#at=18)
This video was created and disseminated by Roberto Branni from WinBeta.it