Cloud Downtime: Microsoft 365 Outage Hits Global Office Workflows

Office workers across 74 countries faced interruptions in email, collaboration, and productivity tools from November 12 to November 13. The failure impacted nearly 130,000 recorded problem instances, leaving users unable to access core Microsoft 365 services for more than nine hours.

The outage affected Outlook, Microsoft Teams, Word, Excel, PowerPoint, OneDrive, SharePoint, and Copilot. Outlook’s Exchange services suffered the most severe issues, while Teams chats and meetings saw lighter disruption. Some users in North America regained access to certain Teams features, though connectivity problems persisted for others.

Microsoft attributed the failure to possible server configuration errors and high traffic loads. The company noted that several recovery attempts failed because servers became unavailable again as traffic returned. Microsoft stated there was no indication of a cyberattack.

The disruption extended to integrations connected to OpenAI and Anthropic services. As Microsoft worked to restore systems and stabilize its infrastructure, the company focused on redirecting traffic to manage the load.

The incident highlights the reliance on cloud-based platforms for daily business operations. Users experienced gaps in email access and cloud storage, requiring manual workarounds for critical tasks during the nine-hour window.

Microsoft continued its restoration efforts through November 13. The company monitored system stability to ensure that affected services remained online for the global user base.