Windows Server 2012 build 8102

Windows Server 2012 build 8102 is the official Developer Preview build of Windows Server 2012. This build includes many features from Windows 8 RTM, including the Start screen, Metro interface, and the Charms bar.

Timebomb update
This build was originally set to expire on 2012-03-11, but Microsoft released KB2671501 for both this build and its client counterpart to extend the expiration date to 2013-01-15.