Move over, MS-DOS. On November 20, 1985, Microsoft released version 1.0 of the graphical desktop operating system known as Windows, and the world of computing changed forever. Over the next 30 years, the industry would see 19 significant new versions of the now-ubiquitous OS released, and that's not even counting bizarre offshoots like Windows RT or Windows 10 for IoT devices.
In honor of this milestone anniversary, let's take a look back at Windows' major revisions through the ages. Special thanks to GUIdebook and GUI Gallery for help with the screenshots.
Editor's note: This article was originally published on November 16, 2010, but was updated in 2015 to include Windows 8, 8.1, and 10.