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Microsoft says Copilot buttons still missing in classic Outlook

September 16, 2026 · BleepingComputer · Severity: MEDIUM

Microsoft says it's still investigating a known issue that causes the Copilot and Copilot Chat buttons in Classic Outlook to disappear for some Windows users.

Key Takeaways

  • Microsoft has acknowledged that Copilot integration buttons remain missing from classic Outlook for some users after the latest updates.
  • The issue affects users who have not migrated to the new Outlook interface, with Microsoft advising affected users to switch to the new Outlook experience.
  • Organizations relying on Copilot in classic Outlook should test the new Outlook interface to ensure compatibility before planning migration.
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