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OS X Mountain Lion
5.9
Average
update
Last updated: Mar 6, 2026
description OS X Mountain Lion Overview
OS X Mountain Lion brought many features from iOS to the Mac, including the Notification Center, Messages, and Reminders. It was a pivotal moment in the convergence of Apple's mobile and desktop platforms. However, it is now completely obsolete and insecure. It cannot run modern web browsers or applications, making it useless for contemporary computing.
It is strictly for historical interest or for maintaining vintage hardware that cannot support newer versions of the operating system.
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