- Sources: report, discussion, second thread
- Summary: Microsoft opened incident EX1464935 for Exchange Online on 2026-08-31. The Microsoft 365 Status account stated it had identified an issue with an authentication component contributing to impact, developed a remediation strategy, and was applying it to a portion of infrastructure to test efficacy before broader rollout. Down Detector showed more than 6,000 reports at 08:17 PT, with 37 percent reporting problems receiving messages, 23 percent app problems, and 20 percent website problems.
- Why it matters: Outlook depends on Exchange Online for mailbox access and mail delivery, and Microsoft has published no root cause and no end time.
- Follow-up: Track whether Microsoft publishes a root cause for EX1464935.
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