Microsoft finds no evidence of malicious activity after global service outage

Microsoft stated on November 14, 2026, that it has found no evidence of malicious activity causing the widespread Outlook outage. The service disruption affected multiple Microsoft products, including Outlook, Teams, and the AI assistant Copilot. The company identified high load in infrastructure across multiple regions as the primary cause of the connectivity errors.

Global scope of service disruption

The outage impacted users globally, with reports of issues appearing in the Americas, Australia, and the United Kingdom. According to DownDetector, a website that monitors real-time service outages for online platforms, service failure peaks were recorded at 15:00. The incident reached 74 countries and territories in less than one hour. As of the reporting on November 14, 2026, the duration of service instability reached 15 hours.

Microsoft reported on November 13, 2026, that initial efforts to repair the major Outlook outage were not meeting expectations. Charles Lamanna, the Executive Vice President of Copilot at Microsoft, stated that there is no evidence that the global service disruption is the result of malicious or cyber activity. Microsoft stated that the company is unaware of any malicious activity causing the incident and will treat the resolution with urgency and priority.

Impact on critical sectors

The instability caused significant disruptions across various sectors. According to O Globo, the outage impacted stock exchanges and public health services. The disruption of these essential services highlights the widespread reliance on Microsoft cloud infrastructure for global operations.

The impact extended into the financial sector in Europe. O Globo reported that some companies in Europe experienced delays in releasing financial statements due to the disruption. This delay suggests that the connectivity errors hindered the ability of organizations to meet strict reporting timelines.

Technical cause and recovery

The technical investigation by Microsoft pointed toward infrastructure issues rather than external attacks. The company identified high load in infrastructure across multiple regions as the specific cause of the connectivity errors. This high load prevented users from accessing essential tools within the Microsoft 365 suite, which is a subscription-based cloud service suite including Word, Excel, and PowerPoint.

While the outage affected a vast array of users, Microsoft continues to work toward a full resolution. The company has prioritized the stabilization of Outlook, Teams, and Copilot to mitigate further impact on international commerce and public services. The incident remains a significant event due to the speed at which the disruption spread across 74 countries and territories.

Glossary

• Word — Word is a tool within the Microsoft 365 suite, which is a subscription-based cloud service suite. It is one of several essential tools provided by the service.
• Teams — Teams are participants in a competition. In a tournament structure, teams are split into groups where winners advance to subsequent rounds.
• Copilot — Copilot is a generative artificial intelligence chatbot developed by Microsoft AI. It utilizes the Microsoft Prometheus large language model and features a conversational interface style similar to ChatGPT.
• DownDetector — DownDetector is a website that monitors real-time service outages for online platforms.