Dropbox's goal seems to be killing the local filesystem on iOS. Email, being a big part of using an iPhone and the associated file-transfering, is their one big problem; you can't attach things to emails from dropbox, or save them to it from the default app. Here, they get a high-quality email app for their users, and it gives them the opportunity to do things like send attachments as links to dropbox files (great for lock-in), and give users a positive brand experience, to prevent the commoditization of the space.
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