Summary of evolution of MacOs.

Razrabotannaya as the reliable and efficient MacOS operating system initially surprised all with the fact that it worked only on computers of production of Apple. "It will be so safer for it, and for us - is quieter!", - developers, however, nevertheless said made small retreat from this rule and still allowed to put the latests version on any hardware.

The first MacOS appeared in 1984, but something more or less similar to that beauty which we got used to see on "poppies" was invented only closer in 2000. At the same time the first version was named very simply: System 1.0, and here pleasant to hearing of "Lion", "Leopard", etc. is already property of our times. In the course of the development MacOS passed a way from complete instability (yes, there were times when the error of operation all system just closed 1 applications) to absolute reliability, multitasking and many other.

Sources:

https://yandex.kz/search/?text=Windows%2010&lr=10298&clid=2233627

https://studfiles.net/preview/5757585/page:2/