Service alert — November 12, 2026: Microsoft is investigating reports that some users in the Americas are having difficulty accessing Exchange Online mailboxes through multiple connection methods.
What Microsoft has reported
Microsoft’s official Microsoft 365 Status account says it is investigating the mailbox-access reports. Administrators can find tenant-specific information in the Microsoft 365 admin center under incident EX1550543.
What users may experience
Affected users may have difficulty opening or connecting to their Exchange Online mailboxes through one or more connection methods. The scope may vary by organization and user; this notice does not mean every Microsoft 365 customer is affected.
What businesses should do
- Check the Microsoft 365 admin center’s Service health section for EX1550543.
- Document which users and connection methods are affected.
- Avoid making unrelated password, DNS or mail-flow changes solely in response to this incident.
- Retry access periodically while Microsoft investigates.
Microsoft’s public status page may also be unavailable during the incident. Hensley / Elam is monitoring the situation and will update this article if Microsoft publishes a material change.
If your organization’s email issues continue after Microsoft reports service restoration, contact Hensley / Elam Support so the problem can be checked separately.
Sources: Microsoft 365 Status and Microsoft’s guidance for checking Microsoft 365 Service health.