Have you ever caught yourself checking your e-mail for no particular reason? Perhaps you unconsciously decided to open it to see what messages might be waiting for you. For many, the number of unread messages represents a sort of goal to be completed. Yet to feel rewarded, the user must have a sense of accomplishment. What happens when in-boxes become flooded with too many messages? Users can give up when they sense the struggle to get their in-boxes under control is hopeless. To combat the problem and give users a sense of progress, Google created “Priority Inbox.”20 Using this feature, Gmail
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