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The operating system that looked like the future and ran like a permission slip. Vista arrived in 2007 with translucent Aero glass — and an endless stream of "allow or deny?" prompts every time you tried to do anything. XP users refused to leave; Windows 7 users pretend it never happened.
The operating system with the rolling green hill wallpaper—Windows XP arrived in October 2001 with Luna's glossy blue taskbar, the green Start button, and the cheerful startup chime that defined a generation's relationship with computers. It was stable, beloved, and so enduring that users clung to it long after Microsoft stopped supporting it, making it the most iconic OS of the 2000s.