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Apexward Pulse
Type Incident

Microsoft

Microsoft 365 Outage Disrupts Outlook, Exchange Online and Teams

1 source

At a glance

Low
30-day window, from the last update
Evidence-weighted, not popularity
Why Low

Low rather than Medium: exposure is scored at a default because we cannot see your systems or suppliers. If you run or depend on Microsoft Exchange Online, treat it as Medium.

Briefing

There is no written leader briefing for this story yet. These questions come from the facts we hold.

Questions to ask IT

  • Do we use Microsoft Exchange Online and Microsoft 365, and has anything unusual been seen on it?
  • Would our monitoring spot an attack like this, and who would we call if it did?

Next steps

  1. Confirm whether the affected organisation is a supplier or partner, and what contingency exists

Summary

  • Microsoft 365 services including Outlook, Exchange Online and Teams experienced a disruption due to failed server health checks, with the company investigating the cause and confirming no evidence of a cyberattack.

Read the original reportSecurityWeek(opens in a new tab)

Products and services involved

18 reports

Part of Microsoft vulnerability disclosures and incidents

All 18 reports in this story

Pulse

Last change 2h ago · Recheck overdue since 13 Nov 2026, 00:32 UK time

  1. Story12 Nov 2026, 22:32 UK time · 2h ago

    Linked reporting from SecurityWeek (independent original reporting).

    Read source (SecurityWeek)

1 entry so far. The timeline chart appears once this story has more history.

Sources

How we know

Statements extracted from sources. Higher confidence means stronger corroboration.

  • ClaimedHeadline60% confidence

    Microsoft 365 Outage Disrupts Outlook, Exchange Online and Teams

  • ProbableSummary fact75% confidence

    Microsoft says failed server health checks disrupted Outlook and other Microsoft 365 services. The company is still investigating the cause and has disclosed no evidence of a cyberattack.