GoKawiilMicrosoft 365 outage stretches into second day despite partial fixes
A multi-day outage tied to Microsoft's Exchange Online authentication system continues to disrupt Outlook and other Microsoft 365 services into Tuesday, even after Monday's mitigation efforts. Microsoft says the root cause was a misconfiguration preventing authentication components from deploying properly across parts of its infrastructure, affecting SharePoint, Teams, Copilot, Defender XDR, Purview, the admin center, and Universal Print alongside Outlook.
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An authentication-layer failure spreading across so many interconnected Microsoft 365 services underscores how a single infrastructure misstep can cascade into widespread business disruption, since these tools underpin daily operations for millions of enterprise users. The prolonged timeline also raises questions about Microsoft's incident response speed for core cloud services that companies depend on for critical communication and productivity.
- Outage began with Exchange Online issues but expanded to multiple Microsoft 365 services via a shared authentication configuration.
- Microsoft says mitigations are progressing and telemetry shows improvement, but full resolution hadn't been confirmed by Tuesday.
- Affected services include Outlook, SharePoint, Teams, Copilot, Defender XDR, Purview, Universal Print, and the admin center.
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Published there as: “Microsoft 365 outage drags on, but things are improving”
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