FIM Client add-in, Outlook 2013 and hiding Groups ribbon

Hi,

I am trying to hide the Groups ribbon/button on Outlook client, using the registry values from here https://msdn.microsoft.com/en-us/library/ff800821%28v=ws.10%29.aspx . I am using 32-bit Outlook 2013. The registry value ShowGroupManagementUi set to 0 does not hide the "GROUPS" button from Outlook.

Can anyone confirm if they have been able to hide the Groups ribbon on Outlook 2013 or if there is something else to check?

-Mikko