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Microsoft 365 core services suffer massive global outage: Outlook, OneDrive, Teams affected, gradual restart and recovery underway

Source: IT之家 Published: Business & Funding 中文 OutlookOneDriveTeams 3 more articles on this event →
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On November 12, local time, multiple core Microsoft 365 cloud services experienced a large-scale failure, affecting Outlook, Exchange Online, Microsoft Teams, OneDrive, SharePoint, Microsoft 365 Copilot, and other products, with users in multiple regions worldwide reporting that they could not access services normally. Microsoft said some infrastructure experienced abnormally high load, and further investigation found that a large number of servers unexpectedly became unavailable, placing greater load pressure on the remaining servers; Microsoft has paused all deployments and configuration changes, adjusted connection traffic distribution, and begun restarting affected servers to gradually restore service capacity.

Translation(model translation, not the source's own text)

Microsoft 365 core services suffer major global outage: Outlook, OneDrive, Teams all affected, gradual restart and recovery underway

IT之家, November 13: On November 12 local time, multiple core Microsoft 365 cloud services experienced a large-scale outage, affecting products including Outlook, Exchange Online, Microsoft Teams, OneDrive, SharePoint, and Microsoft 365 Copilot. Users in multiple regions around the world reported being unable to access the services normally, and some users could not send or receive emails, load their mailboxes, or access cloud files.

After the outage occurred, monitoring website Downdetector received a large number of user reports, with the number of problem reports for Outlook once approaching 130,000. In addition to email services, Microsoft Teams, Copilot, and other Microsoft 365 services also experienced connectivity problems to varying degrees.

Microsoft initially said it was investigating problems encountered by users in the Americas when accessing Exchange Online mailboxes through multiple connection methods. It later expanded its description of the scope of impact, confirming that users in any region around the world could be affected.

![](https://img.ithome.com/newsuploadfiles/2026/11/2deef2aa-0bce-43ac-b7d3-251768e69c67.png?x-bce-process=

The translation is machine-generated and individual terms may be off. Nothing is rewritten or cut; the original is authoritative.

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