GreatHorn is a software as a service (SaaS) product that exists inside the cloud. It works particularly well with Microsoft Azure, where it can run in tandem with a corporate mail server for Office 365 users. Because it integrates with the mail software within the same cloud, the installation is seamless and mostly invisible. Once its up and running, the product uses machine learning and the knowledge of billions of previously scanned emails to provide context when examining the mail stream. The product works by delivering mail sent to a user into a hidden folder, then that mail, if approved, goes into their inbox.”]