The Developer’s Guide to the Microsoft Exchange APIs (EAS, EWS, and Graph)
Blog post from Nylas
Microsoft's Exchange APIs have evolved over the years, introducing complexities in maintenance and integration. The blog discusses three key protocols for integrating with Exchange: Exchange ActiveSync (EAS), Exchange Web Services (EWS), and Microsoft Graph. EAS was created for mobile synchronization with a lightweight procedure but lacks a public SDK, making it challenging to integrate. EWS provides a more traditional XML SOAP service and simplifies authentication but lacks some mobile device policy enforcement. Microsoft Graph aims to unify Office APIs with a focus on data types rather than products, marking a shift from EWS, though not all features have transitioned, and it doesn't support on-premises Exchange deployments. The blog suggests using the Nylas Email API as an alternative to simplify integration across various email providers, offering full CRUD and bi-directional sync capabilities with broad support for different SDK languages.