Microsoft's Global Outage Explained: What Went Wrong And Why Did Recovery Take So Long?

How did a technical failure at Microsoft disrupt everyday work, airline operations and government systems across the world? And why did it take so long to restore services? A massive Microsoft outage brought several essential digital services under pressure, affecting Outlook, Microsoft Teams, Word, Excel, OneDrive, SharePoint and Microsoft's AI assistant Copilot. At the peak of the disruption, Downdetector recorded nearly 1.3 lakh reports of Outlook problems, with issues reported across 74 countries and territories, including India. In this explainer, we break down what happened, how Microsoft's infrastructure problems triggered a wider disruption, and why attempts to restore affected servers proved complicated.