In 1985, Microsoft released version 1.0 of the graphical desktop operating system known as Windows. Over the next 25 years, the industry would see over 16 significant versions of the now-ubiquitous OS. In honor of this 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 by Brad Chacos on August 24, 2015 to include Windows 8, 8.1, and 10.