New Outlook - how to identify

The "New Outlook" is not a traditional email client. It is a web app that syncs a copy of your mail, calendar, contacts, and even your account credentials (passwords or access tokens) from all your accounts (including Gmail, Yahoo, etc.) to Microsoft's cloud servers.

This is the information you probably don't know.

Anyway, my research shows that probably at this time (November 2025) it is impossible to revert back to the Classic Outlook and even if it would be easy it would be only a temporary solution as it would stop working October 2026

So, I guess I have to switch to using Mail.

My email is an iCloud address, but I am using Outlook because I got used to it, also I can schedule calls and add them to the Calendar very easily. Outlook is much more complex than Mail and it has more features. But if privacy becomes an issue, of course, I will revert to Mail. I am asking the Apple community cause I trust it more than the Microsoft one. I am pretty sure there are other Outlook users here too.