![Microsoft chairman and chief software ar windows, windows 8, windows history, microsoft, windows xp, windows 7, windows vista, windows 95, bill gates](https://heavy.com/wp-content/uploads/2014/08/93518116.jpg?quality=65&strip=all&w=780)
Gallery: 9/27
Bill Gates talks to the press about Windows XP at a news conference in 2001. Fun fact: Windows XP was code-named "Whistler," which makes "Threshold" seem like a pretty cool code name by comparison. (Getty)
Gallery: 9/27
Bill Gates talks to the press about Windows XP at a news conference in 2001. Fun fact: Windows XP was code-named "Whistler," which makes "Threshold" seem like a pretty cool code name by comparison. (Getty)
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Windows Operating Systems: The Photos You Need to See