Microsoft fixes Outlook and Teams outage caused by network change

timesofindia.indiatimes.com —

Microsoft resolved a 24-hour outage affecting Outlook, Teams, and Copilot, traced to a network change, disrupting email for businesses worldwide and forcing some to use faxes. The outage began November 12, impacting users in at least 74 countries, including financial firms and shipping groups. Microsoft ruled out cyberattack or AI causes, citing cascading failures from a network capacity upgrade that overwhelmed Exchange Online servers. Recovery involved reversing the network change and gradually restoring traffic, with email backlogs shrinking by Friday. The disruption also affected AI tools like ChatGPT and Claude, which rely on Microsoft 365 data, prompting a promise of a full incident report.


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