Microsoft restored its services after a 12‑hour global outage that crippled Outlook, Teams and Copilot for millions of users.
Outage Overview
The outage began on November 12 and lasted more than 12 hours, disrupting Outlook, Teams, Copilot and other Microsoft 365 services worldwide.
Microsoft announced on November 14 that it had fully restored all products, affecting over 430 million users.
The company said the failure stemmed from a network capacity upgrade that triggered a cascade of server health‑check failures, not a cyberattack.
Charles Lamanna, executive vice president of Copilot, Agents and Platform, said technical challenges and failure modes complicated recovery.
He pledged a full post‑mortem, promising to publish a timeline and repair steps to prevent future outages.
Tony Burke, Australia’s home affairs minister and cybersecurity overseer, compared the incident to the 2024 CrowdStrike outage caused by a faulty antivirus update.
AJ Thompson, chief security officer at Northdoor, said the cascade resulted from servers failing health checks, overloading failover systems.
He emphasized the issue was basic infrastructure, not Copilot overload.
Microsoft engineers faced setbacks, as posts from the official Microsoft 365 Status account showed repeated delays in restoring service.
Recovery progressed gradually across North America, Europe and Asia‑Pacific, but some users still experienced intermittent email delivery.
The outage delayed corporate earnings releases and impacted government agencies in the United States, Australia and Japan.
Reuters and Chris Summers contributed reporting.
