According to Microsoft there's an outage with Exchange Online

Users may be unable to connect to their mailboxes in Exchange Online through multiple connection methods

Issue ID: EX1550543 Affected services: Exchange Online Status: Service degradation Issue type: Incident Start time: Nov 12, 2026, 11:17 AM EST

User impact Users may be unable to connect to their mailboxes in Exchange Online through multiple connection methods.

More info Potentially impacted connection methods may include:

• Outlook on the web
• Messaging API (MAPI)
• Exchange ActiveSync (EAS)
• Representational State Transfer (REST) API

Scope of impact This issue may affect users in North America, Latin America, Canada, Chile and Mexico.

Current status Nov 12, 2026, 11:55 AM EST We're reviewing service health telemetry information to identify and isolate any errors contributing to impact for further investigation. Next update by: Thursday, November 12, 2026 at 1:00 PM EST

More info: https://www.odu.edu/article/microsoft-exchange-outage