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The release of Big Sur was the first time the major version number of the operating system had been incremented since the Mac OS X Public Beta in 2000. After sixteen distinct versions of macOS 10 ("Mac OS X"), macOS Big Sur was presented as version 11 in 2020, and every subsequent version has also incremented the major version number, similarly ...
macOS retained the major version number 10 throughout its development history until the release of macOS 11 Big Sur in 2020. Mac OS X 10.0 and 10.1 were given names of big cats as internal code names ("Cheetah" and "Puma").
Later that year, on September 25, 2001, Mac OS X 10.1 (internally codenamed Puma) was released. It featured increased performance and provided missing features, such as DVD playback. Apple released 10.1 as a free upgrade CD for 10.0 users, in addition to the $129 boxed version for people running Mac OS 9.
[2] [3] [4] First launched on January 6, 2011, as part of the free Mac OS X 10.6.6 update for all current Snow Leopard users, [2] [3] Apple began accepting app submissions from registered developers on November 3, 2010, in preparation for its launch. [5] After 24 hours of release, Apple announced that there were over one million downloads. [6]
macOS Sierra (version 10.12) [4] is the thirteenth major release of macOS (formerly known as OS X and Mac OS X), Apple Inc.'s desktop and server operating system for Macintosh computers. The name "macOS" stems from the intention to unify the operating system's name with that of iOS, watchOS and tvOS.