The security clock is ticking down for Apple’s OS X Mountain Lion, which will probably be retired from support this fall before the Cupertino, Calif. company releases El Capitan.

Mountain Lion, also known as OS X 10.8, debuted in July 2012, and was the last Mac operating system to come with a price tag: The now-unreasonable $19.99.

Apple supports editions “n”, “n-1” and “n-2,” where “n” is the current. That means when El Capitan, aka OS X 10.11, launches, likely in October, it will push Mountain Lion down into the “n-3” slot, and thus to retirement.

Under the formula, El Capitan will be “n” once it releases, Yosemite “n-1” and Mavericks “n-2.”

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