Apple: 3 million copies of OS X Mountain Lion in 4 days

Apple says Mac users downloaded 3 million copies of Mountain Lion, its latest operating system, in the first four days it was available.

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That makes it the fastest launch of an Apple operating system ever, the company says. It released Mountain Lion Wednesday.

Apple charges $20 for the software. That pays for downloads for all of a buyer's personal computers.

Apple also provides the OS for free to buyers who bought a Mac on or after June 11.

Mountain Lion brings features from the iPhone and iPad to the Mac. The enhancements include tight integration with Apple's online storage service, iCloud, and a Notification Center that shows incoming mail, calendar reminders and other events. 

See more highlights in the following video, and in the stories linked below:

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