Microsoft experienced a service disruption affecting users’ ability to open files through Office for the Web and Microsoft Teams, with the company confirming resolution after investigating elevated error rates across its online productivity platform.

The incident, tracked internally under MO1329446 in the Microsoft 365 Admin Center, began with widespread user reports of file-access failures across web-based Office experiences.

Users attempting to open documents, spreadsheets, or presentations via the browser-based Office suite or Teams encountered errors, disrupting collaboration workflows for potentially millions of enterprise users globally.

Microsoft’s engineering team initially acknowledged the issue, stating they were “investigating reports that some users are unable to open files in Office for the Web or Microsoft Teams.” Shortly after, the team confirmed detection of elevated error rates spanning multiple Office for the Web services.

We’re investigating reports that some users are unable to open files in Office for the web or Microsoft Teams. For more information, please see MO1329446 in the admin center.
— Microsoft 365 Status (@MSFT365Status) June 1, 2026

Engineers conducted service telemetry analysis to identify the failure scope, correlating error patterns across service dependencies to determine the root cause and remediation path.

The cross-dependency investigation suggests the disruption may have stemmed from a shared backend component or infrastructure layer serving multiple Microsoft 365 services simultaneously, a pattern consistent with prior Azure-backed service incidents.

Microsoft has not yet publicly disclosed whether the incident originated from a code deployment, configuration change, or underlying infrastructure fault.

Microsoft confirmed that the impact is no longer occurring and has published final incident details under MO1329446 in the Microsoft 365 Admin Center. Affected organizations with active Microsoft 365 subscriptions can review the post-incident report through their admin portals for detailed timelines and remediation steps.

Enterprises relying on Microsoft 365 for critical workflows are advised to monitor the Microsoft 365 Service Health Dashboard for real-time status updates and configure admin center alerts to receive proactive notifications during future service disruptions.

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