The heritage of what would become mac OS had originated at Ne XT, a company founded by Steve Jobs following his departure from Apple in 1985.
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.
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.