* So you've acquired a Gmail client - why? Surely whatever good comes out of that Google would just re-create into Gmail. Sure enough: Inbox. I'm not even sure how this would have fitted into the Dropbox strategy? I doubt they would have wanted to be acquired by Gooogle. I doubt they would have wanted to compete in the email space... If it was just to get attachments from email surely there are many other ways to solve this problem.
* Second thought: Dropbox has acquired a photo sharing and organization app. Surely they don't think they will win over Facebook, iPhoto, Flickr... What for? Store the photos? Even if it's an awesome product, don't they just risk Apple Photos getting better? Or wait... Here comes Google Photos.
Inbox. Google Photos. iPhotos. Facebook Moments. It feels like both Mailbox and Carosel were just ticking timebombs.