Mailboxes contain years of important conversations and business information yet there are no easy ways for developers to find and use that information. This is what Context.IO does. It's the missing API that turns mailboxes into a data source developers can leverage. Users can also get web-based previews of attachments, get the version history of attached files and get a list of insertions and deletions between two versions of an attachment. The API is read only. It uses RESTful calls and responses are formatted in JSON.