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The new Mail app is here!
One of the loudest complaints about Windows 8 was its weak Mail app. The newly designed, full-featured Mail app in Windows 8 draws heavily from the Outlook.com experience and is far more full-featured than its predecessor.
A cleaner view of People
The People app is part of the unified communications app, which also includes Mail and Calendar. In Windows 8.1 it gets a major overhaul to remove clutter.
A selection of Windows 8.1 desktop themes
It wouldn't be Windows without a selection of desktop themes. The default settings include a new Windows image and a "Lines and colors" slideshow.