Dropbox today rolled out Groups functionality and a Groups API to all its Dropbox for Business customers. In short, the additions allow teams to create lists of members within Dropbox and then manage which folders and files they can access. There are two main use cases for Groups: sharing work quickly with a whole team (as opposed to manually sharing one-by-one) and simplifying the onboarding of new members (adding a user to a group gives them access to everything shared so far).