If you use the native Mail app on your Mac with a work account Microsoft 365, you may encounter a rather unpleasant problem starting today. Microsoft began disabling the Exchange Web Services (EWS) protocol within Exchange Online, but the Mail app in macOS is still not working when synchronizing work accounts. Microsoft 365 still depends on it. As a result, not only your emails, but also your calendars, contacts, notes, and reminders may stop syncing overnight.
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About a sudden change from the side MicrosoftHowever, it is definitely not possible. The company stopped actively developing EWS in 2018 and announced in 2023 that it would gradually disable it in Exchange Online from October 2026, which is still happening now. Moreover, the change is not being rolled out to all users at the same time, but gradually, so while everything may work without any problems for one user, synchronization on the Mac for another may stop practically overnight.
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In a way, I think it's strange that Apple Of course, it has known about the end of EWS for a long time, but it has not yet received its replacement in macOS. Although the Californian giant has stated in its documentation for IT adminiThe organizers state that with Microsoftem is actively cooperating in the transition of its applications to more modern ones Microsoft Graph API, with the necessary changes expected to arrive in a future macOS 27 update, but it is not yet clear when exactly this will happen. Pro companies that use Microsoft 365 and at the same time they leave their employeesance work with native applications Applu on a Mac, this can be a rather unpleasant complication.
The good news, however, is that EWS is not dead yet and IT adminiAdministrators can re-enable its use in Exchange Online, or organizations can still have it active and will not be affected by today's change for now. However, this is only a temporary solution, as Microsoft plans to permanently disable EWS in Exchange Online on April 1, 2027 and does not plan to extend its support further at this time.
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Pro Therefore, it is most important for an ordinary user to know that if his/her computer stops working today or in the following days, Microsoft 365 account in Mail on Mac to sync mail, the problem may not be in his Mac or in the account settings, but it may be the result of the gradual shutdown of EWS by Microsoftu. The definitive solution will only be the transition of applications Apple na Microsoft Graph, on which now Apple together with MicrosoftIt works.
