If your work email on your Mac quietly stopped updating this week, it is probably not your Wi-Fi. Starting October 1, Microsoft began disabling Exchange Web Services (EWS) by default in Exchange Online — the aging protocol that Apple’s Mail and Calendar apps on Mac still rely on to sync Microsoft 365 work accounts. No warning dialog, no migration wizard: messages and calendar events just stop arriving, MacRumors reports.
The timeline everybody ignored
This cutoff has been signposted for years. Microsoft stopped adding new features to EWS back in 2018, and in 2023 it announced the protocol would start being disabled in Exchange Online from October 2026. That date is now here — and it is only the first of two deadlines.
The rollout is phased, so some Mac users lose sync sooner than others. Organizations that explicitly kept EWS running are unaffected for now. But the real deadline is April 1, 2027: that is when Microsoft shuts EWS down in Exchange Online permanently, with no extensions currently planned. Whatever workaround your IT department applies today has an expiration date.
Apple, for its part, says it is “actively working with Microsoft” to move Mail, Calendar, Contacts, Notes, and Reminders to the newer Microsoft Graph API in a future macOS 27 update. The catch: that update has not arrived. Apple skipped the macOS 27.1 betas entirely, and the macOS 27.2 beta release notes make no mention of Graph support. The cavalry is coming, but nobody will say when.
Are you affected? A 30-second check
The breakage is narrower than it sounds, which is exactly why it is confusing:
Hit: work or school accounts hosted on Microsoft’s Exchange Online, synced through Apple’s built-in Mac apps.
Not hit: personal email (Gmail, iCloud, anything IMAP), companies running their own on-premises Exchange servers, and — crucially — iPhone and iPad, which sync through Exchange ActiveSync instead of EWS. If your phone still gets work mail but your Mac does not, this is almost certainly why.
Real-world evidence is already piling up. An IT notice from Old Dominion University, forwarded to AppleInsider, reports users losing university email in Apple’s Mail app and flatly recommends switching to Outlook — noting that iPhone and iPad apps are unaffected.
Three workarounds, ranked
1. Ask IT to re-enable EWS (fastest, temporary). Administrators can turn EWS back on per organization. This restores sync immediately — but only until April 2027.
2. Switch to Outlook for Mac (most durable). Microsoft’s own client already speaks the Graph API and works fine. If your company is standardized on Microsoft 365 anyway, this is the path of least resistance.
3. Use Outlook on the web (zero-install fallback). No sync protocol involved at all. Not elegant, but it cannot break this way.
Why this matters: Apple’s Mac-at-work problem
The commodity rewrites frame this as a one-day glitch. It is not. The real story is that Apple shipped five core Mac apps — Mail, Calendar, Contacts, Notes, Reminders — on top of a protocol Microsoft froze eight years ago, and still has no dated fix. Every organization that runs Macs alongside Microsoft 365 now faces the same choice: beg IT for a temporary EWS reprieve, or surrender to Outlook.
That is a remarkable position for the Mac to be in at work. The platform that markets itself as the computer you love is, for Exchange Online users, currently the computer whose email app cannot email. Until Apple’s Graph migration lands with an actual date, the only lever that matters belongs to your IT administrator — and it expires on April 1, 2027.
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