Connect-ExchangeOnline -UserPrincipalName myadminuser@mycompany.de -ShowProgress $True
Set-OrganizationConfig -MailTipsExternalRecipientsTipsEnabled $true
Set-ExternalInOutlook -Enabled $true
See:
Powershell Admin Tools for Office 365 and local AD, File Server, ...
Connect-ExchangeOnline -UserPrincipalName myadminuser@mycompany.de -ShowProgress $True
Set-OrganizationConfig -MailTipsExternalRecipientsTipsEnabled $true
Set-ExternalInOutlook -Enabled $true
See:
Powershell Admin Tools for Office 365 and local AD, File Server, ...