Microsoft Office for the Web and Teams Users Face File Access Outage

Key Takeaways

• Microsoft 365 services, specifically Office for the Web and Microsoft Teams, experienced a significant outage.
• The disruption prevented users from opening files within these web-based applications.
• The incident, tracked as MO1329446, impacted collaboration workflows for potentially millions of global users.
• Microsoft’s engineering teams successfully resolved the issue, though the root cause (code deployment, configuration change, or infrastructure fault) has not been publicly detailed.

Microsoft 365 Outage Disrupts File Access for Office for the Web and Teams Users

Microsoft recently experienced a notable service interruption that hindered users’ ability to access and open files across its web-based Office suite and Microsoft Teams platform. The technology giant subsequently announced that the issue had been resolved following an investigation into heightened error rates observed across its extensive online productivity offerings.

The incident, designated MO1329446 within the Microsoft 365 Admin Center, commenced with a surge of user reports detailing failures when attempting to open documents through browser-based Office applications.

Impact on Collaboration Workflows

Users attempting to engage with word processing documents, spreadsheets, or presentations via web browsers or within Teams encountered persistent errors. This disruption significantly impacted critical collaboration workflows for a potentially vast user base spanning global enterprises.

Microsoft’s engineering teams swiftly acknowledged the problem. An initial statement confirmed they were “investigating reports that some users are unable to open files in Office for the Web or Microsoft Teams.” Shortly thereafter, the company’s status updates verified the detection of elevated error rates affecting multiple services underpinning Office for the Web.

The Microsoft 365 Status account on X (formerly Twitter) posted an update on June 1, 2026, stating, “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.”

Investigation and Resolution

Engineers initiated a comprehensive analysis of service telemetry data to pinpoint the scope of the failure. This involved correlating error patterns across various dependent services to identify the underlying cause and formulate an effective remediation strategy.

The nature of this cross-dependency investigation suggests that the disruption might have originated from a shared backend component or an infrastructure layer that supports numerous Microsoft 365 services simultaneously. Such a pattern has been observed in previous service incidents linked to Azure-backed infrastructure.

As of this report, Microsoft has not publicly disclosed the precise origin of the incident, whether it stemmed from a new code deployment, a configuration change, or an inherent fault within its infrastructure.

Microsoft later confirmed that the service impact had ceased. Detailed incident information for MO1329446 is available in the Microsoft 365 Admin Center. Organizations with active Microsoft 365 subscriptions can access the post-incident report through their administrative portals for a full timeline and specifics on the resolution steps taken.

What You Should Do

• Organizations should review the official post-incident report for MO1329446 within their Microsoft 365 Admin Center for detailed insights into the disruption and resolution.
• Regularly monitor the Microsoft 365 Service Health Dashboard for real-time status updates on all Microsoft 365 services.
• Configure alerts within the Microsoft 365 Admin Center to receive proactive notifications regarding any future service disruptions, ensuring rapid awareness and response.
• Implement robust local backup strategies for critical files, especially those frequently accessed via web-based productivity tools, to minimize impact during service outages.

Disclaimer: HackersRadar reports on cybersecurity threats and incidents for informational and awareness purposes only. We do not engage in hacking activities, data exfiltration, or the hosting or distribution of stolen or leaked information. All content is based on publicly available sources.