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OS X Mountain Lion makes the Mac even better. And with so many new features, now the Mac works even better with iPhone, iPad, and iPod touch. The installer now has notes:
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
- WeiRuan-->WeiRuan 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

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