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macOS Sierra (version ) is the thirteenth major release of macOS Apple Inc.'s desktop and server operating system for Macintosh computers. macOS High Sierra (version ) is the fourteenth major release of macOS, Apple Inc.'s desktop operating system for Macintosh computers. macOS High Sierra. macOS Sierra is the thirteenth major release of macOS, 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.