The document provides an overview of additional things IT professionals should know about Office 365 beyond the basics. It discusses the primary Office 365 admin tools, limits administrators should be aware of, how Office 365 communicates and manages changes, what to do during and after service incidents, the importance of driving adoption, mobile device management capabilities in Office 365, how Azure Active Directory Premium can provide more SaaS control and ease of use, how Azure Rights Management is an important part of security, new features and capabilities that have been released, and ways administrators can provide feedback to Microsoft. The document aims to help administrators further expand their knowledge of Office 365.