Important Information about Exchange Online (ExO) and Outlook (new)

• Outlook (classic), as the previous Outlook from the Office365 package is known, is intended to be replaced by Outlook (new).

• Microsoft has already introduced the Outlook (new) version as the default Outlook client on Windows 11 systems.
• The new Outlook does not support connection to the on-prem Exchange 2016 mail server! Therefore, Outlook (new) should only be used if your account has already been migrated to Exchange Online.
• It is important to know that Outlook (new) is more similar to a web application than a classic desktop program. It is based on Progressive Web App (PWA) technology and essentially functions like a web version of Outlook running in a desktop frame.
• Unlike the classic Outlook, the new version does not offer offline support.
• There is no local storage of emails in the form of caches or OST files.

S/MIME support under Windows in Outlook (new) is currently not available.

However, it should be possible to use it with a tool called S/MIME control.

IMPORTANT PRIVACY CONCERNS!

Please note that generally, all passwords entered in Outlook (new) are sent to Microsoft. This applies to all private email accounts such as gmx, gmail, etc. EXCEPTION: the ETH email password! For the ETH email account, the password is replaced by a token that Microsoft receives. This token does not allow any conclusions to be drawn about the password.