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You can add features and roles to both local and remote servers from the Server Manager. Just choose what you need to install, and Windows Server will install the appropriate packages.
You can install and run Metro applications on Server 8, with a Metro-style Start Menu replacing the old start orb. As in the Windows 8 client, you click in the lower left corner of the desktop or press a Windows key to open the Start screen.
Windows Server 8's Storage Pools let you build massive virtual storage arrays from commodity hardware, with thin provisioning and support for the new ReFS resilient file system.