Overview On July 13, 2024, Microsoft experienced a significant system outage that affected a wide range of services, including Microsoft 365, Teams, Outlook, OneDrive for Business, Exchange Online, and SharePoint. The outage predominantly impacted users in Europe, Asia, and Africa, leading to widespread disruption in business operations and communication. Cause of the Outage Microsoft initially identified a "wide-area networking (WAN) routing change" as the primary cause of the outage. However, a more detailed investigation revealed that a command issued to update the IP address on a WAN router triggered the problem. This command caused all routers in the WAN to recompute their adjacency and forwarding tables, which led to packet forwarding failures across the network. The issue arose because the command behaved differently on various network devices and had not been fully vetted in Microsoft's qualification process. Impact on Services The outage resulted in users being ...
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