An ongoing service incident is preventing users of Microsoft Teams and Office for the web from opening files, affecting multiple Office web applications such as Excel. Microsoft has identified a potential cross-service issue and is investigating telemetry data to isolate the root cause. The disruption results in an error message stating that Office Online services are unavailable. This is a cloud service outage impacting user access rather than a software vulnerability with exploit code. Microsoft has not provided a patch but is managing remediation internally. No specific geographic impact or exploitation in the wild has been reported.

Users of Microsoft Teams and Office for the web are unable to open files, disrupting productivity and collaboration. The incident affects multiple Office web applications, including Excel. There is no evidence of data compromise or exploitation. The impact is limited to service availability and user access to files within the affected cloud services.

Microsoft is actively investigating and working to restore service availability. As this is a cloud service incident, remediation is managed by Microsoft, and no user action is currently required. Users should monitor official Microsoft 365 Status updates and the Microsoft admin center for progress and resolution information.