Global Microsoft 365 outage disrupts email and communication services across multiple regions

A massive global service outage disrupted Microsoft 365 services on November 12, 2026, impacting essential business tools such as Outlook and Microsoft Teams. The disruption spread rapidly, reaching 74 countries and regions within a single hour, according to data from DownDetector. The outage affected various parts of the world, including the Americas, Europe, Asia, and portions of Africa.

Technical disruptions and affected services

The outage significantly impacted Exchange Online, which prevented users from accessing email through Outlook web, desktop, and mobile applications. It also disrupted MAPI, ActiveSync, and REST connections. Beyond email, several other major services were affected, including SharePoint Online, Microsoft 365 Copilot, Microsoft Defender XDR, Microsoft Planner, Microsoft To Do, and Microsoft Purview.

Japanese media reported that specific functions within Purview, such as Data Loss Prevention, auto-labeling, and data classification, were among those impacted. Furthermore, Microsoft administrators reported facing difficulties accessing the Microsoft 365 Admin Center. According to Japanese media, there were conflicting reports regarding the initial cause; while it was initially suggested that high load on the infrastructure was to blame, Microsoft later clarified that the issue stemmed from multiple servers becoming unexpectedly unresponsive, which subsequently concentrated the load on the remaining infrastructure.

The technical failure also extended to artificial intelligence tools. OpenAI reported that it was investigating issues where new connections might not function due to problems with Microsoft connectors. Similarly, Anthropic confirmed that its service provider was experiencing issues affecting Microsoft 365 connectors.

Recovery efforts and historical context

Microsoft investigated a small number of configuration changes as a potential cause of the outage. In response, the company implemented several mitigation measures, including pausing all deployments, redistributing connection traffic on a global scale, and restarting the affected servers. Microsoft stated that services may recover gradually as users reconnect following the restoration of capacity.

As of 8:00 AM JST on November 13, 2026, Microsoft was continuing its recovery efforts for the affected servers. DownDetector recorded a significant spike in reports during the event, with Outlook-related issues peaking at 138,058 reports. Japanese media also noted that by 5:47 PM ET, there were 763 reports specifically related to Teams access issues.

This incident follows a previous outage involving the Azure cloud platform last month, which was reported by Japanese media to have affected various industries. The recent disruption highlights the ongoing sensitivity of global digital infrastructure to server stability and configuration management.

Glossary

• Exchange Online — Exchange Online is Exchange Server delivered as a cloud service hosted by Microsoft itself. It is built on the same technologies as on-premises Exchange Server and offers essentially the same services as third-party providers that host Exchange Server instances.
• SharePoint Online — SharePoint is used for internal social networking, collaboration, and a public web site. SharePoint Online is a component offered within the small business plan of the Office 365 platform.
• Microsoft 365 Copilot — Microsoft 365 Copilot is a work version of Bing Chat designed for Microsoft 365 applications and services. It serves as an added feature to Microsoft 365 with an emphasis on enhancing business productivity.
• Microsoft Purview — Microsoft Purview is a service that includes functions such as Data Loss Prevention, auto-labeling, and data classification. It is part of the Microsoft 365 suite of services.
• Microsoft 365 Admin Center — The Microsoft 365 Admin Center is used to access Copilot settings. It allows for tenant-level configurations, such as enabling Dataverse data for all users or specific groups.