Apple has updated its OS X Server app for Mountain Lion to version 2.21. It improves the speed of downloading Mac App Store software, adds Time Machine service monitoring, brings Retina display support for the Wiki Server, adds the ability to use Active Directory groups in Profile Manager and more.
OS X Server lets Mountain Lion users turn the OS into a server OS utilizing a suite of utilities included in the application. The US$20 app is available at the Mac App Store. The 2.21 update is available via the Software Update component of the Mac OS X Systems Preferences app.