Some weeks ago I requested a MailBox Beta access. Today it arrived. And it's probably the sweetest way how to unlock an Beta app I've ever seen.
You don't receive an access code - you receive an access coin. It's an animated, blinking coin. Not just a normal one. And it looks like this (I already used it so it shouldn't work for you anymore. Sorry!):
Now what could you do with this coin? Right - put it in a (MailBox branded) donation can:
I really like this.
Unfortunaly I'm not really able to try MailBox because it is not supporting custom IMAP but only iCloud and Gmail.
Anyway I now have 3 beta coins to give away. If you want one - just drop me a line @derStadtpirat.http://supercode.co/s/4e1