In the upcoming three years, Microsoft has plans to block requests from non-Microsoft applications to Exchange Online via EWS. In response to this change, Microsoft encourages all users to migrate to Microsoft Graph, ensuring seamless continuity. It’s worth noting that Microsoft Graph lacks certain features that EWS users have long enjoyed.
Initially introduced in 2015, Microsoft Graph serves as a connector for multiple services and devices, similar to how EWS functions. However, a crucial distinction lies in the fact that Microsoft Graph APIs are REST-based, while EWS APIs are SOAP-based. This architectural difference translates into faster JSON serialization and reduced network usage, as outlined by Microsoft.
