Using New Outlook on Windows for personal email, calendar, and contact management
On the corporate machine I use, the MSO suite (including Outlook client) is installed in 'machine-context'.
Switching to 'Outlook (new)' installs the client latest version in 'my user-context' (an account which has no admin permissions on the machine).
The only way for me to go back to 'classic' Outlook client was to turn off the client and uninstall 'Outlook (new)'.
This has not removed my Outlook profile, but please verify in your environment.
Cheers,
Tomasz