Microsoft says Copilot buttons still missing in classic Outlook
Microsoft is still investigating a bug that makes Copilot buttons disappear in classic Outlook for affected M365 Copilot users.
Microsoft confirmed the missing Copilot and Copilot Chat buttons occur after upgrading classic Outlook for Windows to build 20026.20182 and higher, because Outlook cannot locate the MAPI property PR_PROFILE_USER_SMTP_EMAIL_ADDRESS_W. The issue affects Copilot Chat (Basic) and paid M365 Copilot (Premium) customers, and Copilot remains reachable via OWA, new Outlook, and the standalone app. A temporary workaround enables 'Show Apps in Outlook' under Advanced settings, and Microsoft also acknowledged Outlook crashes tied to Kaspersky's Mail Checker (mcou.dll).
- Affects Copilot Chat (Basic) and paid M365 Copilot (Premium) license holders
- Workaround: enable 'Show Apps in Outlook' under File > Options > Advanced
- Copilot remains available via OWA, new Outlook, and the standalone app
- Separate known issue causes Outlook crashes with Kaspersky Mail Checker (mcou.dll)
- Vendors
- Microsoft
- Products
- Microsoft 365 CopilotOutlook
- Organizations
- Kaspersky
- AI models
- Microsoft 365 Copilot
From the original article
2 min read at bleepingcomputer.com
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. [...]
By Sergiu Gatlan · bleepingcomputer.com
A short excerpt; the article and its images belong to the publisher. Summary, key facts and assessment above are AI-written from the article and can be wrong.