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Mac OS X 10.8 Mountain Lion Developer Preview 4

Mountain Lion, a.k.a. OS X 10.8, marries the Apple desktop operating system to iOS features that previously were found only on the iPhone and iPad. Among them: Messages, Notifications, Reminders, a Game Center, and better integration with iCloud. It's not a revolutionary upgrade to the desktop OS, but it should please Mac enterprise users.

With Mountain Lion, Apple is doing away with Software Update and relying on the Mac App Store to notify users of OS updates. Apple recently tested this new update mechanism by offering a number of updated OS and iLife components through the Mac App Store. Happily, as in Software Update, you can choose which components to install and which ones to ignore--it's not an all-or-nothing deal. The components also come with release information and More links for displaying the notes for that update.

Both Apple and third-party programs as of Mountain Lion are updated through the App Store.

The first time you fully boot your newly installed Mountain Lion OS, the Mac App Store installer program identifies incompatible software on your machine and notifies you. Click the More Info button to get the details.

A new dialog box tells you what happened and identifies the incompatible software. All of the offending software is deactivated and moved to a special Incompatible Software folder.

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