Disable the simplified account creation in Outlook 2016
As a User setting in the Registry Editor: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Outlook\setup DWORD (32-bit) Value / DisableOffice365SimplifiedAccountCreation=1 or the Group Policy subkey in the registry: HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Office\16.0\Outlook\setup DWORD (32-bit) Value / DisableOffice365SimplifiedAccountCreation=1
