Microsoft disables EWS in Exchange Online, breaking Apple Mail sync on macOS

Microsoft has started disabling the legacy Exchange Web Services protocol in Exchange Online, cutting off sync for native Apple Mail and Calendar on macOS. Apple is working to integrate the Microsoft Graph API into its native apps for a future macOS 27 update, with the final EWS sunset set for April 1, 2027.

• Microsoft stopped EWS feature development in 2018 and is now disabling the protocol in Exchange Online
• Apple will add Microsoft Graph API support to Mail, Calendar, Contacts, Notes and Reminders by macOS 27
• Final EWS sunset date is April 1, 2027
• On-premises Exchange and Exchange ActiveSync on iOS/iPadOS are unaffected