Microsoft Outlook can see your SMTP credentials
Microsoft Outlook can see your SMTP credentials

Microsoft krallt sich Zugangsdaten: Achtung vor dem neuen Outlook

Sorry I don't have an english version of this article, this is the best source I could find for it.
Official English version: https://www.heise.de/news/Microsoft-lays-hands-on-login-data-Beware-of-the-new-Outlook-9358925.html