Microsoft experienced a widespread and lengthy service disruption affecting Exchange Online, impacting numerous Outlook users globally. The outage began earlier in the day, causing significant delays and failures in sending and receiving emails, alongside critical authentication errors.
According to the company, the root cause was traced back to an authentication component that also affected secondary services. Engineering teams began testing a targeted remediation strategy on a subset of the infrastructure, preparing to roll out the fix more broadly once verified.
- Multi-hour service disruption affecting Outlook and Exchange Online
- Email delivery delays and authentication failures reported
- Microsoft traced the issue to an authentication component
- Targeted remediation strategy tested prior to broader rollout
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