Station Brief
BriefoutageSep 4, 2026

Exchange Online outage causes email delays, 'Server busy' errors

Microsoft is working to resolve an ongoing Exchange Online outage that is delaying email sent to and received from external domains. The company first acknowledged this incident (tracked under EX1467029 ) at 02:19 AM EDT, when it began investigating reports of intermittent "Server busy" errors. "This issue impacts users who may be attempting to send and receive email messages from external domains in Exchange Online [1].

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Sources

  1. bleepingcomputer.com · Exchange Online outage causes email delays, 'Server busy' errors Sep 4, 2026

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