Here’s a quick way to get 1 free GB of Dropbox storage space: Sync with Mailbox

http://thenextweb.com/insider/2013/08/19/dropbox-gives-users-1gb-of-extra-space-just-for-linking-their-account-with-mailbox/

Sync your Mailbox iOS app with your Dropbox account (to do this, go to “Settings” in the Mailbox app and tap “Dropbox”) and you’ll immediately get 1 free GB of extra storage space in your Dropbox account, The Next Web found. I tried it, and it works. Dropbox acquired Mailbox in March (Mailbox Co-Founder Gentry Underwood will be speaking at our RoadMap conference).