Yet to feel rewarded, the user must have a sense of accomplishment. Mailbox, an e-mail application acquired by Dropbox in 2013 for a rumored $100 million, aims to solve the frustration of fighting what feels like a losing in-box battle.20 Mailbox cleverly segments e-mails into sorted folders to increase the frequency of users achieving “inbox zero”—a near-mystical state of having no unread e-mails (figure 26). Of course, some of the folder sorting is done through digital sleight-of-hand by pushing some low priority e-mails out of sight, then having them reappear at a later date. However, by
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