Thirty Years’ War

Windows 1: where it all started for Windows. The original Windows 1 was released in November 1985 and was Microsoft’s first true attempt at a graphical user interface in 16-bit. It was notable because it relied heavily on use of a mouse before the mouse was a common computer input device. To help users become familiar with this odd input system, Microsoft included a game, Reversi (visible in the screenshot) that relied on mouse control, not the keyboard. Photograph: The Guardian.

• Windows turns 30: a look at the operating system through the ages, The Guardian, November 20, 2015