Microsoft 365 is experiencing a significant global service disruption that has now entered its second day. Users across the globe are finding themselves unable to access essential productivity tools, including Microsoft Teams, Microsoft 365 Copilot, OneDrive, and Exchange Online. According to Downdetector, approximately 35% of users have reported issues with the application, while another 35% have faced login difficulties. Additionally, 18% of users have been unable to access the website altogether.
Microsoft has acknowledged the outage and posted a status update on X (formerly Twitter).
Root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services is resulting in impact. The authentication issue created broad functional glitches across major business tools rather than a single uniform offline screen: Microsoft 365 Copilot: Prompts submitted by users that depend on Microsoft 365 grounding data may fail to process. We’ve confirmed that users may experience degraded functionality with various Exchange Online functionalities.
Impacted areas include storage and account summaries, search tools, recent documents, list views, news updates, and “Shared With Me” or Favorited folders. We’re reviewing service telemetry and diagnostic data to isolate the source of the issue. For more information, please see EX1464935 in the admin center. On the status page, the company explained the current status, scope of impact and root cause. Current status: We’re continuing to apply the targeted authentication component fix across the remaining affected infrastructure where necessary. We’re validating that authentication, connectivity and search operations are returning to expected service levels while monitoring for any residual impact and confirming that the remediation is delivering broad mitigation across affected Exchange Online scenarios. As recovery signals continue to trend positively, we’re maintaining extended monitoring across affected service workflows to ensure improvements are sustained. Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event. OneDrive for Business & SharePoint Online: Users face partial page loading errors, timed-out operations, stale data and infinite retries. Exchange Online: Severe degradation of mail access. Connection failures are impacting all access methods. Enterprise mail search tools are not working at all. Microsoft Teams: Search tools, calendar syncs affected by glitches User presence indicators do not refresh automatically or manually and location updates may throw errors. Get the latest technology news and updates. Download the TOI App.
Service telemetry continues to indicate recovery, with availability increasing across previously impacted scenarios as remediation progresses.