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The new Calendar app uses the same Web-based account types as the Mail, People, and Messaging apps. Events from multiple calendars appear on the same screen, with color coding to distinguish which account they're from.
In the Consumer Preview, the Share charm was barely used. In the Release preview, it gets more of a workout. Here, I've found an album in the Music app and then used the Share charm, which gives me the option to create a Facebook post or a tweet for sharing with friends and followers.
Windows 8 is tightly integrated with Microsoft's cloud-based SkyDrive file storage service. This Metro style app offers a top-level view of the photos and documents you've stored there.