Microsoft has fixed a bug that caused Copilot buttons to be missing in Classic Outlook for Windows users. The issue affected users with a Copilot Chat (Basic) license, leading to various UI problems, which the Outlook Team addressed with a service update.
Microsoft identified a bug impacting Windows users with the Copilot Chat (Basic) license in Classic Outlook. Users reported that Copilot buttons disappeared from their interface, affecting functionality in the email client.
The missing buttons included the Copilot option above the ribbon and in the side navigation. Users could see Copilot as an available app but were unable to open it due to the bug.
To resolve the issue, Microsoft implemented a service change on June 29, 2026. Affected users are advised to restart their Outlook client and ensure they are using the latest build by navigating to Update Options.
If users cannot update their client, they can revert to the previous version of Outlook or use Outlook on the web as alternatives. Microsoft continues to investigate related issues, including crashes when using Kaspersky Antivirus.
✨ This summary was generated by AI from the outlets' reporting listed below. It is not independently verified and may contain errors — check the original sources. How BrevFeed works →
Microsoft has fixed a bug that caused Copilot buttons to be missing in Classic Outlook for Windows users. The issue affected users with a Copilot Chat (Basic) license, leading to various UI problems, which the Outlook Team addressed with a service update.