Among the improvements implemented with the new update of OS X Lion The greater compatibility with certain corporate Wi-Fi wireless networks, a better exchange of information with the Microsoft calendar, as well as the solution to the problems that appeared with FaceTime and calls made to telephone numbers outside the United States stand out. Apple has also heard its users crying out to solve the problem related to messages from iMessage that appeared messy under certain circumstances.
There are also improvements for the Safari browser, which reaches version 6.0.5. Included as standard in the update download, according to Apple it improves the stabilization of certain web pages with specific features and chat games.
Also mentioned within the news is the prevention of the system going to sleep once it has been used Boot camp.
As is customary with updates to Apple, Mac OS X 10.8.4 It also has a number of security patches that it highly recommends to users of OS X Mountain Lion to be updated, including those related to the Safari browser. In the event that you do not want to update the version of the operating system, you can always choose to apply the security update, corresponding to 2013-002 to receive the same patches. 
Mac OS X 10.8.4 it is available as a free download through the Mac Apple Store. The combo supposes the download of a package of approximately 809.98 Mb.
