Windows Registry Editor Version 5.00

; Replace 'exchange4all.local' with the customer's ADFS domain
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\AAD\AuthTrustedDomains\https://exchange4all.local/]

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\AAD\AuthTrustedDomains\https://exchange4all.local]

; Enable Modern Auth via ADFS in Outlook on Windows
[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\Identity]
"EnableExchangeOnPremModernAuth"=dword:00000001