November 12, 2026 — Service Alert
Businesses across the United States are reporting disruptions to Microsoft 365 today, including Outlook email and Microsoft Teams. Microsoft is investigating connectivity problems affecting Exchange Online, and some users may have difficulty opening their mailboxes, sending or receiving messages, or accessing cloud services.
Evening Status Update — November 12, 2026 (5:00 PM Eastern)
Microsoft has not confirmed full restoration of Exchange Online. The incident remains active under EX1550543, with additional Microsoft 365 service disruption tracked under MO1550821. Some users may still have trouble connecting to Outlook or accessing their mailboxes.
Microsoft reports that an overwhelmed process is causing affected servers to stop responding. Engineers are isolating and restarting portions of the infrastructure, then gradually restoring traffic while checking stability. Microsoft has not provided a confirmed time for full recovery.
Microsoft says it restored a separate Teams issue in North America earlier today, though other Microsoft 365 problems may continue.
What customers should do: Retry affected services every 30–60 minutes, avoid unnecessary Outlook or account changes, and use phone or other available communication channels if email is unreliable. TMD Technology Services continues monitoring Microsoft’s advisories and will share significant developments here.
For official tenant-specific information, see Microsoft 365 Service Health.
What services are affected?
Microsoft has acknowledged Exchange Online mailbox-access problems in the Americas under incident EX1550543. Teams users have also reported disruptions; Microsoft tracked a North American Teams incident as TM1550488. The impact can vary by organization and user, so not every Microsoft 365 service or account will be affected in the same way.
What is Microsoft doing?
Microsoft has reported elevated infrastructure load and connectivity errors and is working to restore normal access, including by redistributing traffic. Restoration can occur gradually. We recommend checking the Microsoft 365 service health dashboard for the latest tenant-specific updates rather than assuming an estimated recovery time.
What should your business do?
- Retry in 30 to 60 minutes. Some issues may be intermittent as service is restored.
- Avoid unnecessary changes. Reinstalling Outlook, changing passwords, or reconfiguring mailboxes generally will not fix a Microsoft-side service incident.
- Document persistent symptoms. Record the affected user, application, error message, and time so your IT team can distinguish the outage from an unrelated local issue.
- Use alternate communication channels when email or Teams is unavailable.
How TMD Technology Services is responding
Our support team is monitoring Microsoft’s advisories, tracking customer reports, and keeping affected users informed. When the disruption is confirmed as a Microsoft-side issue, we recommend periodically retrying while we continue to monitor for resolution.
Need assistance with Microsoft 365?
TMD Technology Services helps small and midsize businesses with managed IT, Microsoft 365 administration, cybersecurity, and business continuity. If your organization is experiencing persistent issues, call 561-404-9251 or visit TMDTechnology.com.
This is a developing incident. For the latest official status, Microsoft 365 administrators can visit Microsoft 365 Admin Center → Health → Service health.
