Users may be unable to access Excel files through web browsers from SharePoint Online

Title: Users may be unable to access Excel files through web browsers from SharePoint Online User impact: Users may have been unable to access Excel files through web browsers from SharePoint Online. More info: As we worked to remediate the impact, users could open the file in the Excel desktop app to circumvent impact. Final status: Following our completed fix deployment, our testing with affected users has validated that Excel files are able to be accessed through the browser, and that the impact has been remediated. Scope of impact: Users who attempted to access subsites with unique permissions not inherited from the parent site on SharePoint Online weren't able to access files in Excel for the web browser. Start time: Monday, June 8, 2026, at 3:43 AM UTC End time: Thursday, June 18, 2026, at 7:40 PM UTC Root cause: A code issue during the request flow for opening Excel files in SharePoint Online was causing errors, which resulted in impact. Next steps: - We're further analyzing our Excel request flow and the isolated code issue to help us prevent similar issues in the future. This is the final update for the event.

Title: Users may be unable to access Excel files through browser from SharePoint Online User impact: Users may be unable to access Excel files through browser from SharePoint Online. More info: Users can open the file in the Excel desktop app to circumvent impact. Current status: Our deployment is taking longer than initially expected, and we're isolating ways to expedite the remainder of our deployment to remediate impact as swiftly as possible. Scope of impact: Users accessing subsites with unique permissions not inherited from the parent site on SharePoint Online aren't able to access files in Excel for the web browser. Root cause: A code issue during the request flow for opening Excel files in SharePoint Online is causing errors, which is resulting in impact. Next update by: Thursday, June 18, 2026, at 9:30 PM UTC

Title: Users may be unable to access Excel files through browser from SharePoint Online User impact: Users may be unable to access Excel files through browser from SharePoint Online. More info: Users can open the file in the Excel desktop app to circumvent impact. Current status: We're continuing to monitor the deployment of our fix, and we anticipate that we'll be ready to test for mitigation with a subset of affected users by our next scheduled update. Scope of impact: Users accessing subsites with unique permissions not inherited from the parent site on SharePoint Online aren't able to access files in Excel for the web browser. Root cause: A code issue during the request flow for opening Excel files in SharePoint Online is causing errors, which is resulting in impact. Next update by: Wednesday, June 17, 2026, at 9:30 PM UTC

Title: Users may be unable to access Excel files through browser from SharePoint Online User impact: Users may be unable to access Excel files through browser from SharePoint Online. More info: Users can open the file in the Excel desktop app to circumvent impact. Current status: We've completed the validation of the fix and have initiated the release. We expect to have a remediation timeline by the next scheduled update. Scope of impact: Users accessing subsites with unique permissions not inherited from the parent site on SharePoint Online aren't able to access files in Excel for the web browser. Root cause: A code issue during the request flow for opening Excel files in SharePoint Online is causing errors, which is resulting in impact. Next update by: Monday, June 15, 2026, at 9:30 PM UTC

Title: Users may be unable to access Excel files through browser from SharePoint Online User impact: Users may be unable to access Excel files through browser from SharePoint Online. More info: Users can open the file in the Excel desktop app to circumvent impact. Current status: We've confirmed that the code fix is ready for testing and validation. Once completed, we'll provide a more detailed update regarding the deployment schedule. Scope of impact: Users accessing subsites with unique permissions not inherited from the parent site on SharePoint Online aren't able to access files in Excel for the web browser. Root cause: A code issue during the request flow for opening Excel files in SharePoint Online is causing errors, which is resulting in impact. Next update by: Friday, June 12, 2026, at 9:30 PM UTC

Title: Users may be unable to access Excel files through browser from SharePoint Online User impact: Users may be unable to access Excel files through browser from SharePoint Online. More info: Users can open the file in the Excel desktop app to circumvent impact. Current status: We identified a code issue that is causing errors when opening Excel files. We're developing a fix for the issue and anticipate that it will take time to complete. Once the fix is ready, we'll begin deploying to the affected environment to remediate the impact. Scope of impact: Users accessing subsites with unique permissions not inherited from the parent site on SharePoint Online aren't able to access files in Excel for the web browser. Root cause: A code issue during the request flow for opening Excel files in SharePoint Online is causing errors, which is resulting in impact. Next update by: Wednesday, June 17, 2026, at 2:00 AM UTC

Title: Users may be unable to access Excel files through browser from SharePoint Online User impact: Users may be unable to access Excel files through browser from SharePoint Online. More info: Users can open the file in the Excel desktop app to circumvent impact. Current status: Our investigation has identified a recent update as the potential cause of this issue. We're validating that it's the source of impact as well as a fix before deploying to all affected areas. Scope of impact: Users accessing subsites with unique permissions not inherited from the parent site on SharePoint Online aren't able to access files in Excel for the web browser. Next update by: Thursday, June 11, 2026, at 2:00 AM UTC

Title: Users may be unable to access Excel files through browser from SharePoint Online User impact: Users may be unable to access Excel files through browser from SharePoint Online. More info: Users can open the file in the Excel desktop app to circumvent impact. Current status: We've determined that the recent update isn't the cause of impact. We're analyzing other recent updates along with testing additional service-side reproductions of this issue to isolate the root cause. Scope of impact: Users accessing subsites with unique permissions not inherited from the parent site on SharePoint Online aren't able to access files in Excel for the web browser. Next update by: Wednesday, June 10, 2026, at 11:30 PM UTC

Title: Users may be unable to access Excel files through browser from SharePoint Online User impact: Users may be unable to access Excel files through browser from SharePoint Online. More info: Users can open the file in the Excel desktop app to circumvent impact. Current status: We've identified a recent update that could be potentially responsible for this issue. We're in the process of validating this as the source before applying mitigation to all impacted areas. Scope of impact: Users accessing subsites with unique permissions not inherited from the parent site on SharePoint Online aren't able to access files in Excel for the web browser. Next update by: Wednesday, June 10, 2026, at 9:00 PM UTC

Title: Users may be unable to access Excel files through browser from SharePoint Online User impact: Users may be unable to access Excel files through browser from SharePoint Online. More info: Users can open the file in the Excel desktop app to circumvent impact. Current status: Our investigation continues into our reproduction of the event and log review. In parallel, we're also reviewing if any recent updates or changes could be contributing to impact. Scope of impact: Users accessing subsites with unique permissions not inherited from the parent site on SharePoint Online aren't able to access files in Excel for the web browser. Next update by: Wednesday, June 10, 2026, at 7:00 PM UTC

Title: Users may be unable to access files in Excel for the web opened from SharePoint Online User impact: Users may be unable to access files in Excel for the web opened from SharePoint Online. More info: Users can open the file in the Excel desktop app to circumvent impact. Current status: We're reproducing the impact of this event and gathering logs associated with specific requests to better understand this issue and determine our next steps. Scope of impact: Users accessing subsites with unique permissions not inherited from the parent site on SharePoint Online aren't able to access files in Excel for the web browser. Next update by: Wednesday, June 10, 2026, at 5:00 PM UTC

Title: Users can't access Excel files through browser from SharePoint Online User impact: Users can't access Excel files through browser from SharePoint Online. More info: Users can open the file in the Excel desktop app to circumvent impact. Current status: We're investigating a potential issue with SharePoint Online and checking for impact to your organization. We'll provide an update within 30 minutes.