Microsoft Outlook outage disrupts millions' email worldwide

Microsoft Outlook, Teams and related Microsoft 365 services suffered a major global outage beginning November 12, 2026, leaving millions unable to send or receive email. Microsoft reported partial recovery and improved server stability in some regions but said services are not fully restored.

Microsoft blamed overwhelmed processes that establish secure connections, not a cyberattack or a traffic spike, and said isolated infrastructure restarts and traffic rerouting are underway. Third-party integrations like OpenAI and Anthropic were also affected.

The outage disrupted governments, healthcare, airlines and businesses worldwide, forcing paper workflows and phone lines; users are advised to use secondary messaging apps.