Microsoft 365 global outage disrupts productivity tools and AI services for over 24 hours

A global outage of Microsoft 365 services disrupted major productivity and artificial intelligence tools for over 24 hours starting on November 12, 2026. The disruption affected core applications including Outlook, Teams, and Copilot, impacting corporate environments and public organisms in Portugal. The incident originated within Exchange Online in the Americas before spreading to other global regions, including Europe, Australia, and the United Kingdom.

Technical cause of service disruption

Microsoft identified the root cause of the outage as a technical issue involving automated status checks. According to Microsoft, servers failed these automated checks, which led to incorrect assessments of service availability. These incorrect assessments resulted in the subsequent removal of services from the network. This technical failure caused a significant spike in user complaints. Downdetector reported approximately 150,000 reports related to Outlook around 03:00 Hanoi time on November 13, 2026.

Charles Lamanna, the Executive Vice President of Copilot at Microsoft, stated that there are no indications of malicious activity or a cyberattack. Microsoft expressed a deep apology for the disruption and emphasized the company's responsibility regarding customer trust. The company reported that services reached widespread recovery and stability by the afternoon of November 13, 2026.

Impact on third-party and global services

The outage extended beyond Microsoft's own software suite, impacting third-party services that rely on Microsoft infrastructure. Specifically, the disruption affected the integration of ChatGPT from OpenAI and Claude from Anthropic. Other major platforms, including Amazon, Facebook, Salesforce, Slack, and Reddit, were also reported to be affected by the instability.

The disruption had real-world consequences across multiple sectors. In the United Kingdom, healthcare services were affected by the outage, according to lasexta.com. The impact was also noted within public organisms in Portugal and various corporate environments globally. This incident marks the second major Microsoft 365 platform failure in 2026, following a previous instability incident that occurred in January.

Recovery and stabilization process

Microsoft implemented a gradual recovery process to restore services to users. This method involved validating stability at each phase of the restoration. The company also redistributed traffic to alternative connections to ensure the stability of the network during the recovery period. While some sources suggested the outage lasted over 12 hours, Microsoft reported the disruption lasted over 24 hours.

As of the afternoon of November 13, 2026, Microsoft reported that services had achieved widespread recovery. The company continues to monitor the stability of the Exchange Online environment to prevent further incorrect availability assessments. The company remains focused on maintaining the reliability of the Microsoft 365 ecosystem for its global user base.

Glossary

• Teams — Teams is a core application within the Microsoft 365 services. It is a productivity tool used in corporate environments and by public organisms.