Apple has released Mac OS X Mountain Lion 10.8.4 featuring several improvements.
What's New In This Version: The 10.8.4 update is recommended for all OS X Mountain Lion users and has features and fixes that improve the stability, compatibility, and security of your Mac, including the following: ● Compatibility improvements when connecting to certain enterprise Wi-Fi networks ● Microsoft Exchange compatibility improvements in Calendar ● A fix for an issue that prevented FaceTime calls to non-U.S. phone numbers ● A fix for an issue that may prevent scheduled sleep after using Boot Camp ● Improved VoiceOver compatibility with text in PDF documents ● Includes Safari 6.0.5