https://www.heise.de/news/Microsoft-lay ... 58925.html
if you try out the new Outlook, you risk transferring your IMAP and SMTP credentials of mail accounts and all your emails to Microsoft servers....
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The new Outlook also does this in the versions for Android, iOS and Mac. This means that copies "of your email, calendar, and contacts will be synchronized between your email provider and Microsoft data center". This gives the company full access to all emails and allows it to read and analyze them...