Using classic Outlook for Windows in business environments
(And you've just whacked up my 365 subscription, dammit! i'm paying more for features I hate!)
You don't need to pay for the subscription increase. If you click on the option to cancel, it'll go to a page where you can select a 365 subscription with "no AI" and then it'll be the same price as before. It's very sneaky and dishonest that Microsoft doesn't offer you this option unless you say you're going to cancel.