Major Microsoft Outage Disrupts Outlook, Teams and Copilot

By Suad Seferi · 12 November 2026 at 22:49

Microsoft experienced a major service outage on November 12, disrupting Outlook, Microsoft 365, Teams, Copilot and several other cloud services. The incident affected thousands of users, with reports initially concentrated in the United States before Microsoft warned that customers in other regions could also experience connectivity problems. According to outage-monitoring platform Downdetector, nearly 130,000 reports concerning Outlook were recorded during the peak of the disruption. Users reported being unable to access their inboxes, send emails or connect to Microsoft services. Thousands of additional reports involved Teams, Microsoft 365 and Copilot. Microsoft confirmed the incident through its service health advisories, identifying problems with Exchange Online and multiple Microsoft 365 applications. What caused the Microsoft outage? Microsoft's investigation found that numerous servers had unexpectedly become unavailable after failing automated health checks. Their removal placed additional pressure on the remaining infrastructure, causing connectivity failures across several services. The company initially attempted to reduce the impact by redistributing network traffic and restarting affected servers. Engineers subsequently tested an alternative health-check mechanism that successfully returned a portion of the affected infrastructure to service. Microsoft began applying the change more broadly while investigating whether recent configuration updates contributed to the incident. The company has not yet confirmed the definitive root cause. The affected services potentially include Exchange Online, Microsoft Teams, SharePoint Online, Microsoft 365 Copilot, Microsoft Defender XDR, Planner and other enterprise applications. OpenAI and Anthropic also affected The disruption extended beyond Microsoft's own products. Reuters reported that OpenAI experienced problems with its Microsoft connectors, potentially preventing users from establishing new connections or accessing connected services through AI tools. Anthropic also acknowledged problems affecting its Microsoft 365 connector, attributing them to an upstream provider. The incident demonstrates how AI services increasingly depend on external platforms to access business information. For example, an AI assistant connected to Outlook, SharePoint or Microsoft Teams may continue generating responses while being unable to retrieve emails, documents or other information from the affected services. For organisations adopting AI-powered workflows, this dependency creates operational risks that may not be immediately apparent. What this means for businesses Microsoft 365 is widely used by businesses, educational institutions and public organisations for communication, document management and collaboration. When several services become unavailable simultaneously, the consequences can extend beyond email disruptions. Employees may lose access to shared documents, automated processes can fail, and AI assistants connected to business systems may become temporarily unusable. For organisations across the Western Balkans, where Microsoft 365 and cloud-based business applications are part of everyday operations, the incident reinforces the importance of business continuity planning. However, Microsoft has not published country-specific figures showing how many organisations in the region were affected. The disruption also raises questions about the growing dependence of enterprise AI applications on third-party infrastructure. As companies integrate Copilot, ChatGPT, Claude and other AI tools into business systems, service availability increasingly depends on the reliability of several interconnected platforms. A failure in one system can interrupt workflows across multiple applications, even when those applications themselves remain operational. Microsoft continues restoration efforts Microsoft reported progress after successfully testing an alternative method for returning affected servers to service. Engineers are also developing an automated recovery process to identify and restart unresponsive servers while investigating possible configuration-related causes. An earlier Microsoft Teams incident affecting users in the Americas was resolved separately. Microsoft has not confirmed whether that disruption and the wider Microsoft 365 outage were connected. At the time of reporting, the broader incident remained under investigation, with no confirmed timeline for complete restoration. Microsoft's next updates are expected to clarify the extent of recovery and the underlying cause of the failure.