This document provides an overview of the history of Microsoft from its founding in 1975 to the present. It discusses the key people who founded Microsoft, including Bill Gates and Paul Allen. It then outlines major events and product releases in chronological order, such as the releases of Windows 95, Windows XP, Windows Vista, Windows 8, and Windows 10. It also discusses Microsoft's expansion beyond operating systems into new areas like smartphones, tablets, gaming consoles, cloud computing and software as a service.