Microsoft is the biggest software company in the world and is probably most famous for the operating system Windows and Office software suite of applications.
In 1975 Paul Allen and Bill Gates founded the company and it is still going strong today under the leadership of CEO Satya Nadella.
The roots of the company go back as far as 1975 when the first commercially available personal computer appeared on the cover of Popular Electronics – the Altair 8800.
The significance of this computer was that it created a demand for software to go on home-based computers. Microsoft pioneered the development of the operating systems DOS, and Windows.