Windows — originally codenamed 'Interface Manager' — was announced by Bill Gates in 1983, but didn't ship until 20 November 1985. Its first incarnation was as a front end for Microsoft's command-line DOS (Disk Operating System). Windows 1.0 could only support tiled windows, but had desktop features such as MS-DOS Executive (DOS file manager), Calendar, Cardfile, Notepad, Terminal, Calculator and Clock. Utilities included RAMDrive (for managing memory cards designed to beat the PC's 640KB memory limit), Clipboard and Print Spooler. There was even a game, Reversi. In a 'special introductory offer', Windows 1.0 came with Windows Write and Windows Paint and cost $99. The minimum system requirements for Windows 1.0 were: MS-DOS version 2.0; two double-sided floppy disk drives or a hard disk; 256KB of memory or greater; and a graphics adapter card.
Fast forward to 2014, and Windows is still very much with us, subjects of the moment being how organisations should handle the end of extended support for the 2001-vintage Windows XP, and Microsoft's developing plans for Windows 9, codenamed Threshold.