Microsoft 365 Outage Disrupts Outlook and Teams Worldwide
A server pool misconfiguration during routine maintenance is suspected, with a fix expected before Australia's workday begins.
Updated on Nov. 13, 2026 in Data Centers
Live Poll
Do you trust your everyday work apps to stay reliable?
Microsoft 365 services, including Outlook, Teams and Copilot, experienced a global outage on Friday morning, with disruptions reported in multiple regions around the world. The outage is an operational incident at an established cloud service, not a new product or capability.
Why it matters
The disruption shows how a single server-side fault in a large cloud platform can cascade across regions at once, affecting email, collaboration and AI tools simultaneously. It follows a similar mass outage at Optus in September 2025 that was also attributed to a misconfiguration.
The incident was reported through Microsoft's own statements, with initial detection in North America at about 3am AEST and a wider notice roughly two hours later at about 5am AEST. Microsoft has not confirmed the cause, and the number of affected users and total outage duration have not been reported.
The players
Microsoft
Microsoft runs Microsoft 365, the cloud suite that includes Outlook, Teams and Copilot, and operates the global server infrastructure these services depend on.
The details
Part of the server pool that serves the Outlook service fell off the network, and a large number of servers were dropped from the list of available servers. The remaining servers could not serve all incoming traffic, so requests for Outlook, Teams and Copilot failed or slowed. A misconfiguration during a routine Microsoft update process is suspected as the trigger, meaning a change to the system's settings during ordinary maintenance may have removed capacity from the pool.
Timeline
September 2025: Optus experienced a mass outage from a similar misconfiguration.
About 3am AEST Friday: Disruptions first detected within Microsoft 365 in North America.
About 5am AEST Friday: Microsoft said Microsoft 365 applications could be affected in any region.
The Tech Race
The outage follows a similar misconfiguration-driven failure at Optus in September 2025, placing it within a pattern of large service providers experiencing broad disruptions from routine changes. Competing cloud providers face the same operational risk as they expand AI services such as Copilot-style tools across shared infrastructure.
Users who rely on Outlook, Teams or Copilot for work or communication may have experienced failed logins, delayed messages or unavailable features during the disruption. The timeline for full restoration beyond the expected fix before Australia's workday begins has not been announced.
The takeaway
The incident underlines that shared cloud infrastructure concentrates risk, so a single routine update can affect users across continents at once. Watch for Microsoft's formal root-cause report confirming or revising the suspected update misconfiguration.
Further reading
For background on the server infrastructure behind outages like this, see the Data Centers section.
Live Poll
Do you trust your everyday work apps to stay reliable?
