Hi dyn365,
This article explains how server-side synchronization works.
Server-side synchronization is the preferred option for organizations with users who run model-driven apps in Dynamics 365, such as Dynamics 365 Sales and Customer Service, in a web browser or on a mobile device, such as a tablet or smartphone. Server-side synchronization provides direct apps-to-email server synchronization. When you use Exchange, this includes bi-directional synchronization of email, contacts, tasks, and appointments.
