During the conference, Build in progress in Anaheim, Calif., Microsoft has shown to the publicWindows Developer Preview 8 , the new version of its PC operating system that comes on the market next year. It is a versatile platform that can also be used on tablets and that, while maintaining ties with the past, it greatly simplifies how to use user interface with the new 'Metro'  already seen inWindows 7 Phone  and characterized by 'Live Tiles' , animated tiles, offering constantly updated information.  Windows 8 will be much faster at startup and shutdown ...