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Microsoft working to fix Exchange Online mailbox quarantine issue

Microsoft is working to resolve an ongoing Exchange Online issue that has been mistakenly quarantining customers' mailboxes since Sunday.

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Curated Jul 23, 2026 by Aidan Duffy, Threat intelligence editor, AHackaday./Methodology/Sources verified.

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Grounded in this brief only — Microsoft working to fix Exchange Online mailbox quarantine issue. Press ⌘K any time.

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2026-07-14connectiondebug

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cross-platform summaryLive chatter is accelerating; analysts are actively validating impact.