Microsoft to Automatically Install New Outlook on Windows 10 in February

The new email client will coexist with the classic version, but users cannot block its installation via updates.

Microsoft will include the new Outlook app in Windows 10 updates starting January 28 for optional updates and February 11 for mandatory security updates.
The new Outlook will not replace the classic version, allowing both to run simultaneously without altering user configurations or defaults.
Users cannot prevent the installation but can uninstall the new app manually using PowerShell commands or registry tweaks.
The new Outlook currently lacks full feature parity with the classic version, including limited support for .pst files and other functionality issues.
Microsoft plans a gradual transition to the new Outlook, with the classic version potentially being phased out by 2029.