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Microsoft fixes Teams, Outlook launch failures on ARM Windows PCs

Microsoft has fixed a bug that prevented Teams and Outlook from launching on ARM-based Windows devices after installing updates released since the August 2026 Patch Tuesday.

BleepingComputer•Sep 11, 2026, 9:39 AM UTC•3 min read
IN 30 SECONDS

What you need to know

What happenedSource reporting

Microsoft has fixed a bug that prevented Teams and Outlook from launching on ARM-based Windows devices after installing updates released since the August 2026 Patch Tuesday.

Who is affectedSource reporting

The significance for defenders depends on whether the organizations, technologies or attack path described in the reporting overlap with their own environment.

Exploitation statusCDF assessment

No active exploitation was identified in the current reporting reviewed.

Why it mattersSource reporting

The main concern is the security exposure created by the affected technology.

What to do nowCDF guidance

Review the primary source.

THE NEWS

What happened

Verified reporting in clear, practical language.

Microsoft has fixed a bug that prevented Teams and Outlook from launching on ARM-based Windows devices after installing updates released since the August 2026 Patch Tuesday. The significance for defenders depends on whether the organizations, technologies or attack path described in the reporting overlap with their own environment.

Additional reporting may change the picture as affected organizations, researchers or authorities publish more evidence.

REFERENCES

Reference sources

BleepingComputer
CYBERDELTAFORCE INTELLIGENCE

Reporting ends here. The sections below are CyberDeltaForce analysis and defender-focused interpretation.

DEFENDER ACTIONS

What security teams should do now

  • Review the primary source.
  • Check whether the reported technology or organization is relevant to your environment.
  • Monitor for materially new facts before changing controls.
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