So you linked to a random answers article (not a good sign) which in fact isn't even about the product being discussed (it's Word, not Outlook). In addition the ad they mentioned isn't an ad at all, it's a resume assistant feature offered as part of the linked in service and doesn't show up unless you open that feature.

I use office 365 and I've never seen an ad (and I would drop microsoft immediately if I did, they are on a very short leash already, although they don't show 3rd party ads their software bags and annoys the f* out of you and makes every effort to steal you data, even on a business subscription, but I digress)

The linked thread talks about a "home" version, and I have (I assume) a business version, though I dont remember seeing an option, that may be why

Windows itself is full of this. Microsoft is clearly not impressed by your thin ‘would drop immediately if I did’ threats.

I have never seen an ad in Windows. Where exactly do they appear?

In the Start Menu? Have you never seen the ads for Candy Crush?

No, never! And I'm not joking. What kind of Windows you folks have? Or it's maybe country dependent???

I just checked my copy of Word, and honestly that doesn't feel like an ad. Seems like a pretty cool feature for a lot of people, and your link shows how you can disable it through settings.

It's not asking for money nor does it save your personal information, it's just a Github CoPilot for resumes.