There are limited capabilities for Copilot in old Outlook, Microsoft seems to be prioritizing the new Outlook experience for Copilot development. There haven't been any official announcements regarding full Copilot support for Classic Outlook.
Please see below quick information regarding copilot in old outlook
• Copilot for Microsoft 365 in 'classic' Outlook:
https://office365itpros.com/2024/02/15/outlook-win32-copilot-support/• Does copilot 365 work on Outlook Desktop version or only on the web application?:
https://answers.microsoft.com/en-us/msoffice/forum/all/does-copilot-365-work-on-outlook-desktop-vers...I hope this helps!
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