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Infrastructure

Microsoft 365 outage leaves many users unable to reach Outlook mailboxes

Recovery is gradual as servers return to service, and Microsoft has not said when full service will be restored.

12 November 2026 1 min read

Updated 14 November 2026

An unplugged cable and a dark light bulb rest beside a sealed, empty envelope on a plain table.
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A widespread disruption hit Microsoft 365 on Thursday, leaving many users unable to reach their Outlook mailboxes, with Teams, SharePoint Online, Copilot 365 and Defender XDR also reported as potentially affected. Microsoft's status updates pointed to elevated load across multiple regions, which it later attributed to a number of servers becoming unavailable rather than to a rise in traffic. The company said it had paused all deployments, moved traffic away from the affected infrastructure and was restarting servers to restore capacity. By early evening it reported that some servers had returned to service and that recovery was gradual as clients reconnected, though it had no timeline for full restoration. The outage came shortly after a separate Teams incident earlier that day, and Microsoft has not said whether the two are connected.

Why it matters

The outage shows how much day-to-day email and collaboration depends on a small set of shared Microsoft 365 infrastructure. When servers become unavailable, users across several services can be cut off at once, even without any surge in traffic. The earlier Teams incident that same day, which Microsoft attributed to resource contention, adds to the picture of strain on shared systems. Microsoft has not said whether the two events are connected, so what they add up to is still unclear.

Series Microsoft 365 outage

  1. 13 Nov Microsoft 365 outage largely resolved after nearly 24 hours
  2. 13 Nov Microsoft Outage Hits Office, Teams, Copilot and Xbox Live as Fixes Lag
  3. 13 Nov Microsoft outage disrupts UK GPs, police and other public services
  4. 12 Nov Microsoft 365 outage leaves many users unable to reach Outlook mailboxes
The whole series · 4 stories →

Sources · 23