Can I disable new New Outlook (Pre) to all users?

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can I completely disable the use and update to a new Outlook desktop for all the users in Tenant?

Can i use just targeted users for testing, and completely block the rollout of the new Outlook? (I know there is an option in Microsoft 365 Admin Center for targeted users).


1 Reply
Seeking to do the same. So far came across this to hide the 'Try new Outlook' toggle button.

HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\General REG_DWORD “HideNewOutlookToggle” 0 (default) - “Try the new Outlook” toggle, if available in selected update channel, is displayed to users. 1 - “Try the new Outlook” toggle is hidden.