Microsoft Service Outage Lasts Two Days, Outlook and Others Gradually Restored

On November 13, Microsoft announced that a large-scale service outage lasting nearly two days is gradually being fixed. The availability of Outlook email and other Microsoft 365 services has improved, but some users may still encounter intermittent connectivity issues. The outage began Thursday afternoon, affecting businesses, government agencies, and other organizations worldwide. The disruption involved Outlook, Teams, Copilot, as well as services like Word, Excel, PowerPoint, SharePoint, and OneDrive. The network outage monitoring site Downdetector recorded nearly 130,000 related outage reports. Local governments in places like Baltimore County, Jacksonville, and Austin were affected, and some UK government departments and the National Health Service (NHS) also experienced communication interruptions. Air India reported disruptions in customer service communications, and both OpenAI and Anthropic faced issues related to connectivity with Microsoft 365 services. The outage primarily affected the Exchange Online infrastructure that supports Outlook email and calendar services, with some server workloads unusually high and other servers unexpectedly stopping service during automatic checks, leading to user connectivity issues. Microsoft is improving services by restoring servers, reallocating traffic, and deploying software fixes, while also addressing a backlog of delayed emails. Microsoft has not yet determined the root technical cause of the outage but stated that there are no signs indicating that the incident was caused by malicious activity or cyberattacks. They are still working to restore the remaining affected systems and have not announced a specific time for full service restoration.

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