Microsoft has mounted a identified challenge that prompted the Copilot Chat or Copilot button in basic Outlook to vanish for Home windows customers with a Copilot Chat (Fundamental) license.
As the corporate explains in a current help doc, affected customers could now not see the Copilot button within the facet navigation and above the ribbon.
Affected individuals might also expertise a number of of the next points:
- There is no such thing as a (copilot) button within the prime proper space above the ribbon.
- The Copilot icon is lacking from the left app bar or different app areas in basic Outlook.
- Copilot could seem as an out there app in (Add App), however nothing occurs when you choose (Open).
- Once you add CoPilot via ribbon customization, instructions could also be unavailable or grayed out.
- Copilot will proceed to be out there via different entry factors, together with Outlook on the internet and the Microsoft 365 Copilot standalone app and net expertise.
In line with Microsoft, the Outlook crew addressed this challenge with service modifications on June 29, 2026, and suggested customers who nonetheless do not see the (Copilot) button in basic Outlook to restart their electronic mail consumer for the modifications to take impact instantly.
We additionally suggest that affected clients replace to the newest construct by deciding on File > Workplace Account > Replace Choices > Replace Now.
If you cannot repair the bug by upgrading your consumer, you can too work across the challenge by reverting to the earlier Present Channel construct (16.0.20026.20168) or utilizing the brand new Outlook or Outlook Net Entry (OWA).
Microsoft can be at present investigating a identified challenge associated to Kaspersky Mail Checker (mcou.dll) that causes Outlook to crash unexpectedly on techniques operating Kaspersky Antivirus software program.
We suggest that affected Outlook for Microsoft 365 customers test the Software log for an “Occasion 1000” occasion that features the OUTLOOK.EXE failing app title and the MCOU.DLL failing module title to substantiate that this challenge is the reason for the crash.
“For those who expertise this crash, please contact Kaspersky Assist,” the Outlook crew mentioned.
In current months, Microsoft has additionally resolved a identified challenge that prevented some Traditional Outlook customers from sending electronic mail via Outlook.com and prevented customers who enabled the Microsoft Groups Conferences Add-in from utilizing the consumer.
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