Continuum
I like Windows 8, but one of the things I do not like is how Metro and the desktop interoperate (or don't interoperate). After the backlash against Windows 8, I was afraid that Microsoft would backtrack from its Metro design language, but this concept video from Microsoft makes a lot of sense to me, and seems to mesh well with how I use my Surface.
When used as a tablet, every app behaves as a tablet app. When used with a keyboard and mouse, every app behaves like a desktop app. No more arbitrary distinction between Metro apps and desktop apps.
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