Comment by wolvoleo

Yes Mac is the exception. They still have a real app there. On windows they're discontinuing the real app for an electron one (or Webview2 as they call that)

It's unfortunately just a webview to their cloud outlook. If you have an account that's not with Microsoft they will pull your entire mailbox into their cloud (though they don't charge for it). Just pulling directly from another mailserver is something they don't care about.

I'm surprised the search is so bad on Mac too. But spotlight has degraded a lot. When it first arrived in tiger it was great but when I was last on Mac 3 years ago it was indeed pretty bad.