Windows Server 2012 R2 build 9431

Windows Server 2012 R2 build 9431 is the official preview build of Windows Server 2012 R2, also known as the Milestone Preview. This build was released on 25 June 2013 through MSDN and was later made publicly available through the Microsoft TechNet Evaluation Center. It was also additionally released in the form of a set of Repair Content Packages, which are used by  to repair an existing Windows installation, making it one of the few remaining server builds to be released with a 32-bit counterpart after support for the x86 architecture was dropped with the release of Windows Server 2008 R2.

Start button

 * This is the first build to re-implement the visible Start button, which had been absent since Windows Server 2012 build 8220.
 * An option has been added to replace Command Prompt with PowerShell in the ⊞Win menu.
 * Shutdown options have been added to the ⊞Win menu.

Start screen

 * Pinned apps and groups can be moved without needing to go into "Customize" mode.
 * Resize options for pinned apps have been condensed into a context menu.

Apps list

 * The apps list can now be sorted into categories.
 * An option to list desktop apps first has been added.
 * Tiles for desktop applications now use the icon's dominant color.
 * The appearance of the search box has been updated.

Search

 * The Search charm is now functional again.
 * ⊞Win can now be used to open the search charm.
 * Filtering options have been re-added, and can be enabled from a drop-down.

Internet Explorer

 * Internet Explorer 11 now recognizes itself as a preview build.
 * The option to disable tabs has been removed.

Miscellaneous

 * The boot logo has been temporarily changed to a minimalist betta fish.
 * This build adds several navigation-related options, such as being able to disable active corners.
 * In Control Panel, "Taskbar Properties" has been renamed to "Taskbar and Navigation Properties".
 * The "Show Desktop" button has been made smaller.
 * File Explorer now opens to This PC instead of Libraries.
 * The network icon on the login screen has been removed.