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    "headline": "Microsoft 365 outage affects Outlook, Teams; Exchange issues investigated",
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    "prose": "Microsoft 365 services, including Outlook and Teams, are down for thousands of users in the United States as the company investigates problems with Exchange Online. [^1]\n\nMicrosoft 365 services, including Outlook, SharePoint, Copilot, Teams, Purview, Defender XDR, the Microsoft 365 Admin Center, and Universal Print, were affected by an outage starting on Sunday, September 1, 2026. [^2]\n\nAs of 3:15 p.m. EDT, the services continued to experience problems, with thousands of users still reporting outages across the United States. [^3]\n\nMicrosoft stated on X that it identified an issue with an authentication component which is contributing to the impact and is applying a remediation strategy to a portion of infrastructure to test its efficacy. [^4]\n\nReports of issues with Microsoft Outlook began coming in around 12:15 p.m. EDT on Monday, with thousands of users unable to send or receive emails or log in to Outlook. [^5]\n\nMicrosoft stated on September 1, 2026, that mitigation actions were continuing to progress and that indications from telemetry remained positive. [^6]\n\nThe outage was caused by a misconfiguration issue with a core authentication configuration used by multiple Microsoft 365 services, which prevented authentication components from deploying as expected to a portion of the infrastructure. [^7]\n\nBy 10 p.m. ET on Monday, September 1, 2026, Microsoft reported that mail flow was improving but search functionality remained degraded. [^8]",
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      "statement": "The outage was caused by a misconfiguration issue with a core authentication configuration used by multiple Microsoft 365 services, which prevented authentication components from deploying as expected to a portion of the infrastructure.",
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