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Microsoft still has a lot of work to do with its SkyDrive app. It's noteworthy that it includes support for sharing files and folders via the Mail app. That's a benefit of the contracts that allow Metro app to share data.
The Maps app is, not surprisingly, powered by Microsoft's Bing service.
The Weather app is visually stunning and is about as packed with information as you can get. Scroll to the right to see detailed forecasts and historical data for the selected location.