Age of Empires 3 automatically updated and then I didn't need the CD. Is that meant to happen? Before it updated I tried it, and it needed the CD.
Age of Empires 3 Update
age-of-empires-iii
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Best Answer
Update 1.07 for Asian Dynasties removed the need for the CD. It was some years ago, but as far as I know it's still the most recent major update for the game.
It came along around the same time it was added to Steam.