Office 365 Message Encryption is an online service that's built on Microsoft Azure Rights Management (Azure RMS) which is part of Azure Information Protection. The rest of this article applies to the new OME capabilities. Email message encryption helps ensure that only intended recipients can view message content. Office 365 Message Encryption works with, Yahoo!, Gmail, and other email services. With Office 365 Message Encryption, your organization can send and receive encrypted email messages between people inside and outside your organization.
As a result, mailboxes can become repositories for large amounts of potentially sensitive information and information leakage can become a serious threat to your organization.
People often use email to exchange sensitive information, such as financial data, legal contracts, confidential product information, sales reports and projections, patient health information, or customer and employee information.