<P> Microsoft Windows was announced by Bill Gates on November 10 , 1983 . Microsoft introduced Windows as a graphical user interface for MS - DOS , which had been introduced a couple of years earlier . In the 1990s , the product line evolved from an operating environment into a fully complete , modern operating system over two lines of development , each with their own separate codebase . </P>
who developed the first version of windows operating system in 1983
Bill Gates