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These 18 Metro style apps are included with the Windows 8 Consumer Preview. Yes, they're polished and useful. No, they're not complete. In fact, you'll see a prominent App Preview label on most, as a reminder that there are features and fixes still to come.
See Ed Bott's full report on Microsoft's Windows 8 Consumer Preview.
The Mail app includes support for Microsoft's Hotmail service and also connects effortlessly to Microsoft Exchange servers. Gmail users can also add an account right out of the box. You won't find sophisticated features like message-processing rules in this release, though.
Click the Settings charm to access the Permissions box for any Metro style app. The Calendar app has explicit permission to run in the background so it can display detailed notifications of upcoming appointments on the lock screen.