1. A method to selectively mark email as partially reviewed, comprising: estimating an extent to which a user has partially reviewed an email, wherein said estimating the extent to which the user has partially reviewed the email comprises, determining an amount of a body of the email that has been scrolled through, computing the amount of the body of the email divided by a length of the body of the email to generate a review value that represents an estimated portion of the email that has been partially reviewed; assigning the review value to the email; and displaying a visual indicator associated with the email, wherein the appearance of the visual indicator is determined at least by the review value.