I just spent half an hour yesterday uninstalling all apps, registry entries and in-program options for Copilot in Windows and MS Office… but I still can’t get rid of the Copilot button in Outlook. Searching for answers I ended up at the Microsoft support forums and clicked a link to office dot com… and realized there that the entire ecosystem is now called MS365 Copilot App (formerly known as Office)… so I suspect there will be NO way to remove this stuff in the future, and probably that MS365 Copilot will eventually replace Windows itself.