Microsoft E-mail issues and outage

Potentially impacted services are updated and now include:

• Exchange Online
• Microsoft Teams
• Sharepoint Online
• Microsoft CoPilot 365
• Microsoft Defender XDR

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, 5:17 PM GMT+1

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 attempting to access their mailbox in Exchange Online using the affected connection methods.

Current status Nov 12, 2026, 6:45 PM GMT+1 We’ve identified connectivity errors occurring on a portion of Exchange Online infrastructure which receives and processes users’ access requests. We’ve collected networking logs to review to further investigate the source of these errors and confirm our next steps. Next update by: Thursday, November 12, 2026 at 9:00 PM GMT+1