One of the brilliant ways in which Dropbox sort of ingratiates itself to users is the way it hands out extra storage for various tasks. For example, you might get extra Dropbox storage by allowing Dropbox to automatically upload your iPhone photo roll to their servers, or by recommending a new user.
Technically, Dropbox could pretty easily just give everyone a massive amount of storage — say, 100GB — and not impact their business model much (this is the strategy Flickr uses), the gaming aspect of Dropbox is part of its charm. It’s more fun to earn more storage than to simply have storage.
So here’s a nice trick on earning your next Dropbox level up. You can easily add 1GB to your Dropbox account just by linking it to the popular email app, Mailbox.