One of Mailbox’s boldface selling points is that it gets you to inbox zero and keeps you there. OK, but look: Inbox zero is just a construct. It doesn’t matter if you do or don’t have a clean inbox — what matters is that you act on your incoming mail as necessary. Inbox zero is simply an organizational technique to help you accomplish the things you really need to. It is not the end goal; it’s simply a process. Too many people conflate the process of inbox zero with the goal of being more productive.