Migrate legacy EWS scripts to Microsoft Graph in 2026: three Graph surfaces, OAuth + app permissions, RBAC for Apps, EWS to Graph cookbook + side-by-side examples.

Practical playbook to discover, categorise and migrate EWS-based integrations in Exchange Online before the October 2026 phased disablement and the 2027 full shutdown.

Exchange Web Services (EWS) is being retired in Exchange Online. Many organizations still rely on legacy integrations that could silently break. This article explains the outage risks and provides a practical migration strategy to Microsoft Graph.