How to Hide the New Outlook

This is the only way https://github.com/WorkinTimeIT/BlockNewOutlook/blob/main/BlockNewOutlookScripts Intune GPO via Registry HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\GeneralDWORD: HideNewOutlookToggleValue: 1 Via 365 Admin Powershell

Using Powershell to Send Emails via 365

Finally can do this via OAuth ( No Username and password Azure APP ) AND Non-Interactive https://github.com/richfaj/SmtpClientDiag/blob/master/SmtpClientDiag.psm1 SMTP Will be Decommed Soon ( Below )