Sending, receiving, and organizing email in Outlook.com
Well some of you might already have noticed this, but someone at Microsoft has finally woken up to the mountain of complaints about compulsory Copilot in Outlook web ...
Select settings | Copilot then turn off the Copilot switch.
-- an option which should have been there from day 1 !
Fingers crossed this is now permanent, and that no-one decides to remove it anytime.