Do you remember Windows 1.0? Chances are, your answer is "no."
When Microsoft released the very first version of Windows nearly 25 years ago, on Nov. 20, 1985, it was late to the game and little used. Apple had already brought graphical user interfaces to computers with Macintosh more than a year earlier, while DOS systems dominated the market for IBM and IBM-compatible PCs.
Windows 1.0 was a graphical front end for MS-DOS (Microsoft's version of DOS), but in some respects was out-of-date even by the standards of 1985. Windows 1.0, for example, didn't allow overlapping windows, a feature offered with Macintosh.