Green hill. Blue sky. A Start button. You can probably picture it right now.

On October 25, 2001, Microsoft released Windows XP to the public, exactly 25 years ago today. It merged the company's home and business systems into one, introduced a friendlier look, and became one of the most widely used operating systems in history.

Many offices, schools and homes kept running XP for more than a decade, until Microsoft officially ended support in 2014. For a whole generation, it was simply what a computer looked like.

What's your strongest memory of using Windows XP?

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