The global outage began on November 12 and knocked out key services, including Teams calendars, Copilot, and external platforms like Anthropic's Claude. Servers establishing secure connections became overwhelmed following a network change, causing them to drop offline under normal traffic loads. Accumulated message backlogs further slowed recovery efforts before Microsoft finally resolved the core technical failure and restored full operations.
Key points
Microsoft confirmed that the massive outage was caused by internal network changes rather…: Microsoft confirmed that the massive outage was caused by internal network changes rather than a cyberattack.
Outages in Exchange Online automatically crippled dependent platforms like Teams calendar…: Outages in Exchange Online automatically crippled dependent platforms like Teams calendars, Copilot, and external AI tools.
Delayed message backlogs and capacity shortages severely hindered the ability of restarte…: Delayed message backlogs and capacity shortages severely hindered the ability of restarted servers to remain online.
Sources checked by our analysis pipeline: 1
A financial firm in Taiwan went back to the fax machine to confirm trades. At Europe’s Euronext exchange, email was disrupted. Shipping group Maersk warned customers that updates could take longer. The three businesses were among thousands of those caught up in a Microsoft outage that began on November 12 and took more than a day to ease. One of the world’s largest software companies had changed something in its network. A trading desk ended up reaching for a fax.
Microsoft traced the outage to a problem introduced during an earlier expansion of its network capacity. The problem surfaced when the company made a subsequent network change. Microsoft ruled out a cyberattack and said AI played no role in causing the outage. Its public updates describe how servers dropped out of service, why some failed again after being restarted and how trouble in its email system reached applications well beyond Outlook. Microsoft says the Microsoft 365 outage that disrupted Outlook, Teams and Copilot for more than 24 hours is now fixed. In its final status update on the incident, the…
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