Image used with permission by copyright holderThough the sun is quickly setting on Mountain Lion, Apple released an update for its current operating system today. This is likely to be the last major update to Mountain Lion as Apple’s new OS is slated to be unveiled at WWDC next week. The update bears the less-than-sexy moniker 10.8.4 and fixes various bugs while adding several improvements. It’s available for download today through the Mac App Store Software Update.

　　The squashed bugs include issues with FaceTime calls to non-U.S. numbers and enterprise Wi-Fi connections. The update also includes improvements with Microsoft Exchange compatibility in Calendar and improvements with VoiceOver in PDF documents. Lastly, the update bumps Safari up to version 6.0.5, which, according to Apple, “improves stability for some websites with chat features and games.”

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　　One of the biggest fixes included in this update stops iMessages from appearing out of time order, a massive pet peeve for anyone trying to follow a conversation within Messages.

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　　The full release notes for OS X 10.8.4 state the following changes:

　　Compatibility improvements when connecting to certain enterprise Wi-Fi networksMicrosoft Exchange compatibility improvements in CalendarA fix for an issue that prevented FaceTime calls to non-U.S. phone numbersA fix for an issue that may prevent scheduled sleep after using Boot CampImproves VoiceOver compatibility with text in PDF documentsIncludes Safari 6.0.5, which improves stability for some websites with chat features and gamesA fix for an issue that may cause iMessages to display out of order in MessagesResolves an issue in which Calendars Birthdays may appear incorrectly in certain time zonesA fix for an issue that may prevent the desktop background picture from being preserved after restartA fix for an issue that may prevent documents from being saved to a server using SMBAddresses 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 displayingResolves an issue saving files to an Xsan volume from certain applicationsImproves Active Directory log-in performance, especially for cached accounts or when using a .local domainImproves OpenDirectory data replicationImproves 802.1X compatibility with ActiveDirectory networksImproves compatibility when using mobile accountsWhat are you waiting for? Go update your machine now before your OS becomes obsolete next week.