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

[LeonPavesic]

Hi,

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).

Thanks.

[#2]

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

https://learn.microsoft.com/en-us/officeupdates/current-channel#outlook-1

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.