The first desktop version, Mac OS X 10.0, was released on March 24, 2001. All releases from Mac OS X 10.5 Leopard and after are UNIX 03 certified, with an exception for Mac OS X 10.7 Lion. Apple's other operating systems ( iOS, iPadOS, watchOS, tvOS, audioOS) are derivatives of macOS.Ī prominent part of macOS's original brand identity was the use of Roman numeral X, pronounced "ten" as in Mac OS X and also the iPhone X, as well as code naming each release after species of big cats, or places within California. Apple shortened the name to "OS X" in 2011 and then changed it to "macOS" in 2016 to align with the branding of Apple's other operating systems, iOS, watchOS, and tvOS. MacOS has supported three major processor architectures, beginning with PowerPC-based Macs in 1999.Īfter sixteen distinct versions of macOS 10, macOS Big Sur was presented as version 11 in 2020, and every subsequent version has also incremented the major version number. In 2006, Apple transitioned to the Intel architecture with a line of Macs using Intel Core processors.
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