Intune
![](https://pariswells.com/blog/wp-content/uploads/2024/02/image-2.png)
GPO via Registry
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\General
DWORD: HideNewOutlookToggle
Value: 1
Via 365 Admin Powershell
# Connect to Exchange Online first
Connect-ExchangeOnline
# Disable the new Outlook app for all users:
Get-CASMailbox | Set-CASMailbox -OneWinNativeOutlookEnabled $false
# Or for a single user:
Set-CASMailbox -identity [email protected] -OneWinNativeOutlookEnabled $false
# Verify change
Get-CASMailbox | ForEach-Object {
Write-Host "$($_.DisplayName) - OneWinNativeOutlookEnabled: $($_.OneWinNativeOutlookEnabled)"
}