Touting 275 million users, Dropbox on Wednesday debuted a set of productivity tools to help users work more efficiently, including Mailbox for Android, a standalone photo app Carousel, and collaborative editing features. “What makes me so happy is this family just got a lot bigger,” CEO Drew Houston said. About a year after beloved iOS acquiring email client Mailbox for $100 million, Dropbox has finally launched an Android version. The company also opened a limited beta of Mailbox for Desktop, a Mac email client that borrows many of the familiar gestures of Mailbox’s mobile app using hotkeys and trackpad gestures. To further help workers manage email, a new service called Auto-swipe will automatically suggest rules to snooze emails from certain senders.