Microsoft has fixed a known issue that caused the Copilot Chat and Copilot buttons to disappear from the classic Outlook desktop client for some Windows users. The company confirmed the problem and has since released a fix to restore the missing buttons.
The bug specifically affected the classic version of Outlook, not the new Outlook for Windows. Users who encountered the issue would no longer see the Copilot entry points in the mail client, preventing them from accessing the AI-powered features directly from the interface.
Microsoft did not provide details on the root cause, but the fix is now available. Affected users should ensure their Outlook client is updated to receive the correction.