On November 10, 1983, at the Plaza Hotel in New York City, Microsoft Corporation formally announced Microsoft Windows, a next-generation operating system that would provide a graphical user interface (GUI) and a multitasking environment for IBM computers.
Introducing Interface Manager - Microsoft promised that the new product would be on the shelf by April 1984. Windows might have been released under the original name of Interface Manager if marketing whiz, Rowland Hanson had not convinced Microsoft's founder Bill Gates that Windows was the far better name.