Window´s History

 The history of Windows dates back to 1981 when Microsoft started working on a program called "Interface Manager". It was announced in November 1983 as Windows, but Windows 1.0 was not released until November 1985.

From its initial release in 1985 through its continued active development in 2021 and beyond, Windows has been a major player in the consumer and enterprise PC ecosystem. Here is a brief overview of each version of Windows.

Up to and including all versions prior to Windows 2000, Microsoft used an internal version control system called the Source Library Manager (SLM). Shortly after the release of Windows 2000, Microsoft switched to a fork of Perforce called Source Depot. This system was used until 2017 once the system couldn't keep up with the size of Windows. Microsoft had started integrating Git into Team Foundation Server in 2013, but Windows continued to rely on Source Depot. Windows code was partitioned across 65 different repositories with a kind of virtualization layer to produce a unified view of all code.

In 2017, Microsoft announced that it would start using Git, an open source version control system created by Linus Torvalds and in May 2017 they reported that they completed the migration to the Git repository.