{
  "is": "issue",
  "title": "Synchronization errors between Apple Mail, Calendar, and Contacts and Exchange Online on macOS Online on macOS",
  "body": "\u003cp\u003eUpdate October 8, 2026\u003c/p\u003e\n\u003cp\u003eThe outage has been resolved by Microsoft. Synchronization of Apple Mail, Calendar, and Contacts with Exchange Online on macOS is possible again.\u003c/p\u003e\n\u003cp\u003eOriginal message\u003c/p\u003e\n\u003cp\u003eCurrently, in some cases, synchronization of Apple Mail, Calendar, and Contacts with Exchange Online on macOS is not possible. HM-IT is working to resolve the issue.\u003c/p\u003e\n\u003cp\u003eTo access Exchange Online on macOS in the meantime, we recommend using Outlook for macOS: \u003ca href=\"https://www.microsoft.com/de-de/microsoft-365/outlook/outlook-for-mac?market=de\"\u003ehttps://www.microsoft.com/de-de/microsoft-365/outlook/outlook-for-mac?market=de\u003c/a\u003e\u003c/p\u003e\n\u003cp\u003eBackground:\nApple Mail, Calendar, and Contacts use the \u003ccode\u003eEWS\u003c/code\u003e protocol to connect to Exchange Online. As Microsoft had long announced, the protocol was shut down at the beginning of October. Apple has announced that, with a future update to macOS 27, these apps will be switched to the Microsoft Graph interface. Apple has not yet provided a date.\u003c/p\u003e\n\u003cp\u003eThe use of \u003ccode\u003eEWS\u003c/code\u003e can be extended manually by having administrators add a corresponding allow list. HM-IT has taken these steps and has explicitly authorized Apple to continue using EWS.\u003c/p\u003e\n",
  "createdAt": "2026-10-07 15:24:00 +0200 +0200",
  "lastMod": "2026-10-12 10:58:16 +0000 UTC",
  "permalink": "https://status.hm.edu/en/issues/2026-10-07-synchronisationsfehler-von-apple-mail-kalender-und-kontakten-mit-exchange-online-unter-macos/",
  "severity": "disrupted",
  "resolved": true,
  "informational": false,
  "resolvedAt": "2026-10-08 07:05:00+02:00",
  "affected": ["Exchange"],
  "filename": "2026-10-07-synchronisationsfehler-von-apple-mail-kalender-und-kontakten-mit-exchange-online-unter-macos.md"
}