Major incident

Northwestern Information Technology: Apple Mail Connectivity Issues

Affected: Office 365 (Email and Calendaring)

Current status of Northwestern Information Technology: Under maintenance — live Northwestern Information Technology status

Timeline

1. Sep 10, 2026, 19:38 UTC
   identified
   Northwestern Information Technology - Collaboration Services is aware of some issues for a limited number of users that have Apple Mail clients connecting to and using Exchange Web Services (EWS). Apple is also aware of this issue. Users are asked to either use Outlook Web Access (OWA) / Webmail or setup the Mac Outlook client as a workaround until the issue is resolved. Collaboration Services is looking into the issue and updates will be provided as they become available.
2. Sep 11, 2026, 14:21 UTC
   resolved
   Microsoft has confirmed that the issue is resolved and that service is restored for users of the Apple Mail Client connecting to and using Exchange Web Services (EWS).

Updates as published by Northwestern Information Technology (original).