The History of Operating Systems: Visit the following websites to get an overview of the evolution..

The History of Operating Systems: Visit the following
websites to get an overview of the evolution and history of the theory and
function of operating systems:

www.microsoft.com/windows/winhistoryintro.mspx

www.computinghistorymuseum.org/teaching/papers/research/history_of_operating_system_Moumina.pdf

www.osdata.com/kind/history.htm

www.answers.com/topic/history-of-operating-systems/