Apple says Mac users downloaded 3 million copies of Mountain Lion, its latest operating system, in the first four days it was available.
That makes it the fastest launch of an Apple operating system ever, the company says. It released Mountain Lion on 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.
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