All versions of the system released since then run exclusively on 64-bit Intel CPUs and do not support Power PC applications.

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The latest version of mac OS is mac OS High Sierra, which was publicly released in September 2017.

mac OS is based on technologies developed at Ne XT between 19, when Apple acquired the company.

The first desktop version, Mac OS X 10.0, followed in March 2001.

Releases were code named after big cats from the original release up until OS X 10.8 Mountain Lion.

There, the Unix-like Ne XTSTEP operating system was developed, and then launched in 1989.

The kernel of Ne XTSTEP is based upon the Mach kernel, which was originally developed at Carnegie Mellon University, with additional kernel layers and low-level user space code derived from parts of BSD.designed to run on Apple's Macintosh computers ("Macs"). Within the market of desktop, laptop and home computers, and by web usage, it is the second most widely used desktop OS, after Microsoft Windows.Launched in 2001 as Mac OS X, the series is the latest in the family of Macintosh operating systems.The letter "X" in Mac OS X's name refers to the number 10, a Roman numeral.It is therefore correctly pronounced "ten" The first version of Mac OS X, Mac OS X Server 1.0, was a transitional product, featuring an interface resembling the classic Mac OS, though it was not compatible with software designed for the older system.Consumer releases of Mac OS X included more backward compatibility.