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Apple tonight quietly updated Mac Mountain Lion OSX Server to version 2.2.1. The once stand-alone $500+ OS is now just an app, and that app is distributed through the Mac App Store for a very reasonable $19.99.

Today’s update includes some updates around the Caching Server to allow Mac Apps to cache locally. Time Machine service monitoring also becomes more robust, while Wiki Server now supports Macs with Retina displays. Apple also includes the ability to use Active Directory groups within Profile Manager and an improved Centralized Certificate management interface.

The fixes are in for Profile manager deleting apps, SSL errors causing setup failures, and some “timely” fixes for upgrading from Lion Server.

More information on the update can be found here.

What’s New in Version 2.2.1

• Caching Server to speed up download of software distributed by Apple through the Mac App Store.
• Time Machine service monitoring of which computers have backed up, when they last backed up and size of backup.
• Wiki Server support for MacBook Pro with Retina displays.
• Fix for deleting apps uploaded to Profile Manager.
• Ability to use Active Directory groups within Profile Manager.
• Centralized Certificate management interface.
• Fix for setup failures due to an SSL error.
• Fixes for upgrading from Lion Server.

For information on the security content of this update, please visit: support.apple.com/kb/HT1222