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A new viral marketing campaign by Microsoft encourages you to guess the release date of their new operating system, Windows Vista. Each contest submission garners a video download hinting whether your guess is over or under. A sleuthy web-developer found where the over/under videos are stored and reports that the "early" folder ends on November 30 and the "late" folder begins on December 1.

December 1st slated for Vista [The Inquirer]