A massive Microsoft outage has knocked out Outlook, Teams, and other business tools for over a day, and the silence from Microsoft is raising fears this could be more than just a bug.

• Outlook, Exchange, Teams, Copilot, and SharePoint went down across 74 countries, hitting banks, airlines, and even AI companies that rely on Microsoft's systems.
• The outage has lasted over 24 hours with no fix, making it possibly the longest and worst in Microsoft's history, far beyond past outages that topped out around a day.
• Microsoft hasn't explained the cause and can't roll back to a working version, fueling speculation this could be a foreign cyberattack rather than a simple glitch.
• Despite spending billions and employing tens of thousands of cybersecurity engineers, Microsoft couldn't contain or quickly fix the problem, a worrying sign given how much of the economy depends on its systems.
• One theory floated is that Microsoft may be staying quiet at the request of a government agency while they deal with the problem together.

Outlook: Expect pressure on Microsoft to explain what happened once systems are restored, and renewed scrutiny of how exposed critical infrastructure is to outages or attacks.