Microsoft Office for the Web and Teams Hit by File Access Outage

HomeCyber Security Microsoft Office for the Web and Teams Hit by File Access Outage By Guru Baran June 1, 2026 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. Free Webinar on OWASP API Top 10 and Guide to Close Visibility Gaps With WAAP Tags cyber security Copy URL Linkedin Twitter ReddIt Telegram Guru Baranhttps://cybersecuritynews.com Gurubaran KS is a cybersecurity analyst, and Journalist with a strong focus on emerging threats and digital defense strategies. He is the Co-Founder and Editor-in-Chief of Cyber Security News, where he leads editorial coverage on global cybersecurity developments. Trending News New ChatGPT Vulnerability Lets Attackers Turn Web Pages Into Phishing Payloads Hackers Use Fake ChatGPT and Claude Installers to Deploy DinDoor Backdoor Top 10 Best Static Application Security Testing (SAST) Tools for Security Teams in 2026 Critical OpenVPN Connect for macOS Vulnerability Let Attackers Execute Arbitrary Commands Critical Notepad++ Vulnerabilities Allow Attackers to Execute Arbitrary Code Latest News Cyber Security News Attackers Abuse Docker and Kubernetes Misconfigurations to Compromise Host Systems Cyber Security News SmartApeSG Campaign Uses ClickFix Scripts to Infect Windows Hosts With RAT Malware Cyber Attack News Multiple Red Hat Cloud Services npm Packages Compromised to Deploy Credential-Stealing Malware Cyber Security News Iranian Hackers Abuse AppDomainManager Hijacking to Evade EDR Detection Cyber Security News SideCopy Hackers Deploy Persistent XenoRAT Malware to Target Afghanistan Finance Ministry