Microsoft is still investigating a known issue in Classic Outlook for Windows that causes Copilot and Copilot Chat buttons to disappear for some users after upgrading to build 20026.20182 and higher. Microsoft also confirmed a separate Outlook crash bug tied to Kaspersky Antivirus, while suggesting temporary workarounds like enabling “Show Apps in Outlook” or using Outlook on the web. #Copilot #ClassicOutlook #KasperskyAntivirus
Keypoints
- Microsoft is investigating missing Copilot buttons in Classic Outlook for Windows.
- The issue affects users with Copilot Chat (Basic) or Microsoft 365 Copilot (Premium) licenses.
- The bug appears after upgrading classic Outlook to build 20026.20182 and higher.
- Microsoft says enabling “Show Apps in Outlook” may temporarily restore access.
- Microsoft also confirmed Outlook crashes linked to Kaspersky Mail Checker (mcou.dll).