The Mailbox blog:
Rather than grow Mailbox on our own, we’ve decided to join forces with Dropbox and build it out together. To be clear, Mailbox is not going away. The product needs to grow fast, and we believe that joining Dropbox is the best way to make that happen. Plus, imagine what cool things you could do if your Mailbox was connected to your Dropbox…
When I first saw the headline, I immediately laughed. I thought that Mailbox was shutting down, and it was going to be the same situation as Sparrow.
Fortunately though, the Mailbox team will remain separate and continue building the app with support from Dropbox.