[antr]

I'm a huge fan of Dropbox. Here is my long-term wishful thinking of their acquisitions:

    - Audiogalaxy Dec 2012: online iTunes-like audio library, synced across/streamed to all of my devices
    - Snapjoy Dec 2012: online iPhoto-like experience, synced...
    - Mailbox Mar 2013: can Dropbox be the new Gmail? If Google search needs disruption, Gmail is no different
    - Zulip Mar 2014: online chat and team collaboration with file/screenshot/text/etc sharing integrated to a whole new level. Maybe Droplr/CloudApp on steroids
    - Readmill Mar 2014: online ezine/book library... maybe doc management?!  

Bottom line: to become everyone's all-in-one cloud, synced, folder. This would be the platform, a ~/user/ in the cloud

PS: from their Sold and Endorse acquisitions I can only speculate that they might have a(n) (e)commerce play in their mind.

[untog]

It's a nice thought. But as you state, they acquired Mailbox a year ago. As far as I can tell there isn't anything to show for it in terms of an e-mail product.