Unable to open files in Office for the web or Microsoft Teams

A post-incident report has been published.

A post-incident report has been published.

Title: Unable to open files in Office for the web or Microsoft Teams User impact: Users may have been unable to open files in Office for the web or Microsoft Teams. More info: Impacted Office Apps included, but were not limited to: - Excel - PowerPoint When users opened documents, impacted users were shown the following error message "Office Online services aren't available right now. We're working to restore all services as soon as possible. Please check back soon." Final status: We've confirmed through customer reports and service telemetry that the impact has been resolved, and the service has remained stable for an extended period of time. As the issue recovered without any specific engineering actions being implemented, engineer teams continue to investigate the underlying root cause so actions can be taken to prevent the issue from reoccurring. Scope of impact: This issue could have impacted any user attempting to access Office Apps using Office for the web or Microsoft Teams. Start time: Monday, June 1, 2026, at 12:43 PM UTC End time: Monday, June 1, 2026, at 2:27 PM UTC Root cause: During a routine service deployment, a software compatibility issue affected how a subset of servers reported operational health information within the service. As a result, traffic was not distributed as intended, causing some servers to receive a higher volume of requests than they could efficiently process. The increased load led to elevated request processing times and intermittent failures for some SharePoint and OneDrive operations, including file access, file uploads, and related service requests. Next steps: - Please see the Post-Incident Report (PIR) for completed list of next steps.

Our telemetry indicates that service availability has returned to normal levels. We're monitoring the service to confirm sustained service stability and continuing to investigate the underlying root cause of the issue. This quick update is designed to give the latest information on this issue.

Title: Unable to open files in Office for the web or Microsoft Teams User impact: Users may be unable to open files in Office for the web or Microsoft Teams. More info: Impacted Office Apps include, but are not limited to: - Excel - PowerPoint When users open documents, impacted users are shown the following the following error message "Office Online services aren't available right now. We're working to restore all services as soon as possible. Please check back soon." Current status: We’re continuing to analyze service telemetry and have identified elevated error rates across Office for the web experiences. We’re correlating these error patterns across service dependencies to further isolate the source of impact and determine appropriate mitigation steps. Scope of impact: This issue could impact any user attempting to access Office Apps using Office for the web or Microsoft Teams. Next update by: Monday, June 1, 2026, at 3:30 PM UTC

Initial analysis indicates a potential cross-service issue impacting Office for the web experiences. We’re continuing to investigate service telemetry to isolate the source of the issue. This quick update is designed to give the latest information on this issue. Next update by: Monday, June 1, 2026, at 2:30 PM UTC

Title: Unable to open files in Office for the web. User impact: Users may be unable to open files in Office for the web. More info: Impacted Office Apps include, but are not limited to: - Excel When users open documents, impacted users are shown the following the following error message "Office Online services aren't available right now. We're working to restore all services as soon as possible. Please check back soon." Current status: We're investigating service telemetry to isolate the source of the issue. Scope of impact: This issue could impact any user attempting to access Office Apps using Office for the web or Microsoft Teams. Next update by: Monday, June 1, 2026, at 2:30 PM UTC