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UNIX 03 certification was achieved for the Intel version of Mac OS X 10.5 Leopard Releases of Mac OS X from 1999 to 2005 can run only on the Power PC-based Macs from that time period.
After Apple announced that they were switching to Intel CPUs from 2006 onwards, a separate version of Mac OS X 10.4 Tiger was made and distributed exclusively with early Intel-based Macs; it included an emulator known as Rosetta, which allowed users to run most Power PC applications on Intel-based Macs.
Reviews were variable, with extensive praise for its sophisticated, glossy Aqua interface but criticizing it for sluggish performance.
Ars Technica columnist John Siracusa, who reviewed every major OS X release up to 10.10, described the early releases in retrospect as 'dog-slow, feature poor' and Aqua as 'unbearably slow and a huge resource hog'.
Mac OS X was originally presented as the tenth major version of Apple's operating system for Macintosh computers; current versions of mac OS retain the major version number "10".The first desktop version, Mac OS X 10.0, was released in March 2001, with its first update, 10.1, arriving later that year.After this, Apple began naming its releases after big cats, which lasted until OS X 10.8 Mountain Lion.The latest version is mac OS High Sierra, which was publicly released in September 2017.Between 19, Apple sold a separate series of operating systems called Mac OS X Server.