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The new message window takes up the full screen. The ample white space is typical of a Matro style app.
The formatting options shown along the bottom of this screen are normally hidden. To revel them, swipe from the top or bottom of the screen, or right-click with a mouse or trackpad.
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.