The only clue Microsoft is offering is that it will be "Introducing the all-new Windows 1.0, with MS-Dos Executive, Clock, and more".

The history of Windows isn't just changing Start menus. Here's a look at the evolution of Microsoft's flagship operating ...

Microsoft later licensed the code to other OEMs under the name MS-DOS. In 1989, Microsoft released Word for Windows, leveraging its earlier work on Word for DOS, which shipped in 1983.

In honor of Microsoft's 50th anniversary, we've ranked the best Windows consumer operating systems Microsoft has ever shipped, in order from worst to best.