This Apple OS X Mountain Lion Updater is recommended for all 13" MacBook Pro with Retina Display, 21.5" iMac (Late 2012) and Mac mini (Late 2012) systems.It includes all features and updates from OS X 10.8.2 Mountain Lion plus system-specific enhancements and fixes for Late 2012 systems. 

New features include: 
<ul> 
	<li>Facebook</li> 
	<li>Single sign on for Facebook</li> 
	<li>Facebook as an option when sharing links and photos</li> 
	<li>Facebook friends' contact information and profile pictures in Contacts</li> 
	<li>Facebook notifications in Notification Center</li> 
</ul> Game Center 
<ul> 
	<li>Share scores to Facebook, Twitter, Mail, or Messages</li> 
	<li>Facebook friends are included in Game Center friend recommendations</li> 
	<li>Facebook Like button for games</li> 
	<li>Challenge friends to beat your score or achievement</li> 
</ul>Other new features 
<ul> 
	<li>Power Nap support for MacBook Air (Late 2010)</li> 
	<li>iMessages sent to your phone number now appear in Messages on your Mac</li> 
	<li>From Safari and Mail on your Mac you can add passes to Passbook on your iPhone or iPod touch running iOS 6</li> 
	<li>New shared Reminders lists</li> 
	<li>FaceTime now receives calls sent to your phone number</li> 
	<li>New sort options allow you to sort notes by title, the date you edited them, and when you created them</li> 
	<li>Dictation now supports Mandarin, Cantonese, Spanish, Korean, Canadian English, Canadian French, and Italian</li> 
	<li>The Dictionary application now includes a French definition dictionary</li> 
	<li>Sina Weibo profile photos can now be added to Contacts</li> 
</ul>This update also includes general operating system fixes that improve the stability, compatibility and security of your Mac, including the following fixes: 
<ul> 
	<li>An option to discard the changes in the original document when choosing Save As</li> 
	<li>Unsent drafts are opened automatically when launching Mail</li> 
	<li>Receive Twitter notifications for mentions and replies from anyone</li> 
	<li>URLs are shortened when sending tweets from Notification Center</li> 
	<li>Notifications are disabled when AirPlay Mirroring is being used</li> 
	<li>SSL support for Google searches from the Smart Search Field in Safari</li> 
	<li>New preference to have Safari launch with previously open webpages</li> 
	<li>Graphics performance and reliability enhancements</li> 
	<li>USB 3 reliability enhancements</li> 
</ul> 

See <a href="https://support.apple.com/en-us/HT202369" target="_blank">this article</a> on how to verify the authenticity of this update.

Apple

For specific late 2012 models; see listing for details.

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