And it stores the data where

locally

The message viewing component is, of course. Emails are html. The application itself is not a web app.

Outlook (new) is not even a “mail client” at all. It’s an Edge “webview” web app. Adding an account to this “app” actually allows outlook.com the website to sync your entire mailbox, read its contents, and “share” all of that data with their (last checked, could have changed since) 798 “data partners”.

Install Thunderbird.

Before someone says “it’s not pretty enough, I don’t like it”, if the price for privacy is a shiny theme, I’ve got nothing dumb enough to say to you. You’re beyond helping and you’re not worth my time.

Edit ^ that last bit wasn’t about you, person I responded to, just realized it sounded like it was.

Know how to tell someone is a Vegan?

They’ll tell you. Immediately, and never, ever shut up about it. Ever.