Today back in 1985:Microsoft shipped the Windows 1.0

November 20 1985:29 years ago on this day,Microsoft shipped its first windows OS.Copying the Mac's GUI(Graphic user interface,this version of OS was expected to ease the use by avoiding the users to type MS-DOS commands.

Windows 1.0 required a minimum of 256 kilobytes, two double-sided floppy disk drives, and a graphics adapter card. A hard disk and 512 KB memory were recommended for running multiple programs or when using DOS 3.0 or higher.

Check out this link for the features of Windows 1.0
https://www.youtube.com/watch?v=xiKwErpPwMs