Microsoft Windows is the name of several families of software operating systems by Microsoft . Microsoft first introduced an operating environment named Windows in November 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces (GUIs).[1] Microsoft Windows came to dominate the world's personal computer market, overtaking Mac OS , which had been introduced previously. At the 2004 IDC Directions conference, IDC Vice President Avneesh Saxena stated tha ...