What changed
Microsoft 365 services, including Outlook, Teams, and Copilot, have resumed operations following a 24-hour outage that impacted users worldwide. The company confirmed that the issue was not related to cyberattacks or AI systems, but rather a technical problem that emerged during a network capacity upgrade.
What this means in practice
Users are likely to experience a backlog of emails and notifications as systems come back online. Microsoft has increased the queue time for emails to 48 hours to ensure all messages sent during the outage are delivered. Jonathan Leitschuh, an independent researcher, notes that users may receive a flood of notifications as subsystems are restored.
Limitations and availability
The full cause of the outage remains under investigation, with Microsoft promising a post-incident report. The company has addressed the underlying issue and continues to restore service to remaining customers and regions. The outage disrupted critical functions for governments, airlines, law enforcement, and hospitals, highlighting the risks of global reliance on a single service provider.
