Service degradation on Microsoft 365 (Business or Enterprise) - 11/12/2026

User impact: Users may be unable to connect to multiple Microsoft 365 services.

 

More info: Potentially impacted services include:

- Exchange Online

- Microsoft Teams

- SharePoint Online

- Microsoft Copilot 365

- Microsoft Defender XDR

 

Current status: We’re investigating an issue impacting multiple Microsoft 365 services and we've determined the affected infrastructure is experiencing elevated load across multiple regions, which is likely contributing to the connectivity errors. We're restarting and repairing impacted portions of this infrastructure to restore capacity, and reviewing an unexpected increase in a specific type of service traffic to determine whether it's contributing to the elevated load. In parallel, we're evaluating options to redirect traffic to alternate infrastructure to expedite relief.

 

Scope of impact: This issue may affect users attempting to access the affected Microsoft 365 services.

 

User impact: Users may be unable to connect to multiple Microsoft 365 services. 
 

More info: Potentially impacted services include:
 

- Exchange Online
- Microsoft Teams
- SharePoint Online
- Microsoft Copilot 365
 

- Microsoft Defender XDR 
 

 

Current status: We're aggressively pursuing all pathways to reduce impact. As a precaution, we've paused all deployments and configuration changes while we review recent changes for any correlation to this event. We've determined that the elevated load isn't driven by an overall increase in traffic, but by a large number of servers being unexpectedly unavailable, which is shifting load onto the remaining infrastructure. We're investigating what's causing these servers to become unavailable while we work to safely return them to service. 
 

Scope of impact: This issue may affect users attempting to access the affected Microsoft 365 services. 
 

Next update by: Thursday, November 12, 2026, at 10:00 PM UTC

 

More info: More info: Potentially impacted services include:

- Exchange Online

- Microsoft Teams

- SharePoint Online

- Microsoft Copilot 365

- Microsoft Defender XDR

- Microsoft Planner

- Microsoft To Do

- Microsoft Purview: Multiple Purview services including Authorization, Auto Labelling, Data Loss Prevention (DLP), Communication Compliance, and Data Classification are impacted.

 

Current status: We've validated an alternative health check method on a subset of affected infrastructure, which allowed the servers in that subset to successfully return to service, and we're now applying this change more broadly. We're also preparing an automated recovery process to continually detect and restart unresponsive servers, to help keep them in service while this change progresses. Additionally, our review of recent changes has identified a small number of configuration updates that we're investigating as potential contributors to the issue.

 

Previous status: While validating the targeted change, we found that many of the affected servers have become unresponsive, which is preventing us from confirming whether the change is effective. We're restarting these servers so they can come back online with the change in place, and we're applying the same approach to additional affected portions of our infrastructure to validate the results more broadly.

 

Scope of impact: This issue may affect users attempting to access the affected Microsoft 365 services.

 

Next update by: Thursday, November 12, 2026, at 10:30 PM UTC

More info: More info: Potentially impacted services include:

- Exchange Online

- Microsoft Teams

- SharePoint Online

- Microsoft Copilot 365

- Microsoft Defender XDR

- Microsoft Planner

- Microsoft To Do

- Microsoft Intune

- Microsoft Defender for Office 365

- Microsoft Purview: Multiple Purview services including Authorization, Auto Labelling, Data Loss Prevention (DLP), Communication Compliance, and Data Classification are impacted.

- Power BI: All users may intermittently be unable to export reports with MIP sensitivity labels to PDF in Power BI.

 

Current status: We're continuing to work through restarting and validating the affected servers to safely return them to service, and we're exploring opportunities to expedite this process. In parallel, we're assessing whether reverting the small number of recent configuration updates we identified could help accelerate recovery.

 

Previous status: We've validated an alternative health check method on a subset of affected infrastructure, which allowed the servers in that subset to successfully return to service, and we're now applying this change more broadly. We're also preparing an automated recovery process to continually detect and restart unresponsive servers, to help keep them in service while this change progresses. Additionally, our review of recent changes has identified a small number of configuration updates that we're investigating as potential contributors to the issue.

 

Scope of impact: This issue may affect users attempting to access the affected Microsoft 365 services.