The app was a hit from launch, and has since received rave reviews. Mailbox is a Gmail management tool that revamps the inbox to make it “light, fast, and mobile-friendly.” Users can use the interface to swipe messages, scan conversations, snooze emails, an even get push notifications.

Dropbox co-founders, Drew Houston and Arash Ferdowsi, explained their reasoning behind the purchase, in a blog post: The Mailbox app team is currently 14-strong, and will be integrated into the Dropbox team. Talking about the future of the app, the Mailbox team said they’ve decided to “join forces with Dropbox and build it together."

We all quickly realized that together we could save millions of people a lot of pain… Dropbox doesn’t replace your folders or your hard drive: it makes them better. The same is true with Mailbox. It doesn’t replace your email: it makes it better… We’re all looking forward to making Mailbox even better and getting it into as many people’s hands as possible. There’s so much to do and we’re excited to get started!”