Microsoft has announced the retirement (end of life) of Exchange Web Services (EWS) in Exchange Online. Microsoft plans to start disabling EWS on 1 October 2026 and complete the rollout by 1 April 2027.
Organizations using EWS-based Exchange Folder Agents should migrate supported Exchange Online mailbox-folder scenarios to Microsoft Graph before EWS is disabled. See Microsoft's EWS retirement documentation for the current schedule.
See Migrate Exchange Folder Agents from EWS to Microsoft Graph to migrate your agents.