OS X Mountain Lion GM Released to Developers

Jul 9, 2012 - 11 Comments

OS X Mountain Lion GM

The Golden Master seed of OS X Mountain Lion has been released to developers. Golden Master (GM) builds are typically the release version of software, indicating that a public version will arrive very soon. The GM build is 12A269 for Client and 12S302 for Server.

Registered developers can get a download code for Mountain Lion GM directly from Apple’s Dev Center, that code can be redeemed through the Mac App Store as usual. Developers can also download a new version of Xcode 4.4 development suite.

OS X Mountain Lion is versioned as Mac OS X 10.8, and includes over 200 new features, many of which are borrowed from iOS, including iMessage, Notification Center, Share Sheets, Game Center, Notes, Reminders, Dictation, and significantly enhanced iCloud integration.

Apple previously stated that OS X Mountain Lion would be released this July at a price of $19.99. Anyone who meets the system requirements will be able to update to Mac OS X 10.8 from Lion or even from Snow Leopard.


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Posted by: Matt Chan in Mac OS, News


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  1. Steve says:

    I have a little website that I designed with iweb on my mid 2007 macbook pro running Lion 10.7.4… I’m not so good with html and still use iweb to make some changes to my site. Developers… is iweb still available in the upcoming OS X 10.8? Or will it delete the version I have now when I upgrade? Just curious.

    • Matt says:

      iWeb runs in OS X Mountain Lion but it’s no longer officially supported. Make a backup of your site, and everything else, before upgrading to 10.8.

  2. peter says:

    I get mail fail when install Mountain Lion, I have the same mail I get when I buy Lion so whats the problem?

  3. Tzus says:

    The point O point is a good point – if you get the point!

  4. Phuket says:

    Some of the improvements they’re making seem to be under the hood security enhancements that protect against malware.

  5. Alex says:

    one option for a clean install is do the upgrade then alt boot to the recovery partition.

    From there enter Disk utility, erase the partition ‘Macintosh HD’ (or whatever your partition is labelled as.

    Install on your fresh clear partition… Boom! you now have a clean install and you didn’t pay for the overly priced USB installer!!!

    Note: Please make a backup… it goes without saying but once its gone its gone.

    Note 2: if you dont have the recovery partition e.g. fresh drive. So long as you have purchased mountain lion/lion through the app store and have internet connectivity boot cmd + r on startup and you enter internet recovery giving you all the same options as recovery partition

  6. David says:

    Yes just as before if you download and install on a thumb drive you can do a clean install, just as you can with Lion.

  7. nilesisniles says:

    Will there be a simple method to perform a clean install? Upgrading from the Store is fine, however I would prefer to wipe it then install in some manner.

    Last year I bought the usb stick for this purpose.

  8. Thomas says:

    I plan to wait for at least 10.8.2 to allow them to clean up some of the more obvious bugs that will inevitably show up in general release. I’ve followed this precaution ever since I bought my first Mac. Never try a .0 unless you have a completely spare computer to try it on.

    • Rick says:

      Thomas, you could always try running it as a virtual machine in parallels/fusion until you’re satisfied with the build. I usually do that to play around with it before I decide to do a full install.


  9. d_d says:

    I am looking forward to Mountain Lion but I can’t really cite a single feature that I am excited for. It’s almost as boring as iOS 6.

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