Apple has finally released an update for its OS X Mountain Lion and the company says that the version 10.8.4 of the OS X will improve security and stability of Mac machines running the updated software.

The release of the update comes as no surprise as the Cupertino-based company is expected to release an all-new operating system, OS X 10.9, for its Macs machines.

The new update comes with calendar and Microsoft Exchange compatibility improvement and also fixes the issues related to the iMessages.

Here is the entire changelog of the OS X 10.8.4 given by Apple.

* 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

* Improves VoiceOver compatibility with text in PDF documents

* Includes Safari 6.0.5, which improves stability for some websites with chat features and games

* A fix for an issue that may cause iMessages to display out of order in Messages

* Resolves an issue in which Calendars Birthdays may appear incorrectly in certain time zones

* A fix for an issue that may prevent the desktop background picture from being preserved after restart

* A fix for an issue that may prevent documents from being saved to a server using SMB

* Addresses an issue that may prevent certain files from opening after copied to a volume named "Home"

* A fix for an issue that may prevent changes to files made over NFS from displaying

* Resolves an issue saving files to an Xsan volume from certain applications

* Improves Active Directory log-in performance, especially for cached accounts or when using a .local domain

* Improves OpenDirectory data replication

* Improves 802.1X compatibility with ActiveDirectory networks

* Improves compatibility when using mobile accounts

After the launch of OS X Mountain Lion 10.8.2, many Mac users had also started complaining about malfunctioning of iMessage. The iMessage function was found to be slow and sometime out of order after the installation of the OS X 10.8.2.

With the release of OS X 10.8.4, Apple claims to be fixing those problems along with issues related to security.