Microsoft Disables EWS: Apple Mail on Mac May Stop Syncing Microsoft 365

Microsoft has begun disabling Exchange Web Services by default in Exchange Online, cutting off the protocol Apple's Mail, Calendar, Contacts, Notes and Reminders apps on Mac rely on to sync Microsoft 365 work accounts. The phased rollout will end with a permanent EWS shutdown on April 1, 2027, while Apple says it is working with Microsoft to move its Mac apps to the Microsoft Graph API in a future macOS 27 update.

• Microsoft is phasing out EWS in Exchange Online starting October 2026
• Permanent EWS shutdown is set for April 1, 2027, with no extensions planned
• Apple will move Mac apps to Microsoft Graph in a future macOS 27 update
• iPhone and iPad are unaffected as they use Exchange ActiveSync