Mailbox...... YOU WERE THE CHOSEN ONE!!!!
Will never forgive Dropbox for this. I understand it's all a business and not all business decisions turn out for the best, but that doesn't mean I have to like it, or continue using Dropbox.
Which is rather sad. There's nothing wrong with Dropbox itself, but I'd take a working, continuously updated Mailbox app over Dropbox any day.
Mailbox would have died just as quickly on their own as they did under Dropbox.