Microsoft 365 Email Outage – November 12, 2026
Service Alert | November 12, 2026
Network Solutions and Optimization (NSAO) is monitoring a significant Microsoft 365 service disruption affecting Outlook and Exchange Online email connectivity.
Microsoft has acknowledged the issue and is investigating connectivity problems affecting users across multiple regions, including North America.
Microsoft Incident ID: EX1550543
What Is Happening?
Some Microsoft 365 users may experience:
Outlook showing "Disconnected" or "Trying to Connect."
Delays or failures when sending or receiving email.
Difficulty accessing email through Outlook on the web.
Email synchronization problems on mobile devices.
Difficulty accessing certain Microsoft 365 administrative services.
Microsoft has identified connectivity errors within portions of its Exchange Online infrastructure and is investigating the issue.
Because this disruption originates within Microsoft's cloud services, restarting computers, reinstalling Outlook, or making local network changes is unlikely to resolve the underlying problem.
Where Can You Check Microsoft's Service Status?
Microsoft provides several resources for following service interruptions:
Microsoft 365 Service Health Dashboard
Microsoft 365 administrators can use this dashboard to view incident EX1550543 and any available updates.
Microsoft Public Service Status Page
This public page provides an alternative when the Microsoft 365 Admin Center is unavailable. Please note that it may not display the same detailed tenant-specific incidents.
Microsoft 365 Status Updates on X
Microsoft uses this account to communicate certain major service disruptions.
What Should NSAO Customers Do?
If your business is experiencing Microsoft 365 email problems:
Avoid making unnecessary changes to Outlook or your Microsoft 365 account settings.
Do not repeatedly reset passwords or remove email accounts in an attempt to resolve this Microsoft service interruption.
Use telephone or other available communication methods for urgent matters.
Monitor this announcement and Microsoft's official status resources for updates.
NSAO Is Monitoring the Situation
Our team is monitoring Microsoft's progress and will assist customers as services are restored.
Important: Because this outage may affect NSAO's own email communications, customers needing immediate assistance should contact us by telephone rather than relying exclusively on email.
NSAO Support: (330) 966-8097
We appreciate your patience and understanding as Microsoft works to restore normal service.
Network Solutions and Optimization, LLC
Managed IT, Security and Cloud
Last updated: November 12, 2026. This article describes an ongoing service incident and may be updated as more information becomes available.
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