Published 01.10.2025
Microsoft is pushing customers to update to the new Outlook version.
It is possible to change the behaviour and suppress the push-to-update notifications in Outlook.
Windows
@echo off
reg add "HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\General" /v "HideNewOutlookToggle" /t REG_DWORD /d "1" /f
reg add "HKEY_CURRENT_USER\Software\Policies\Microsoft\office\16.0\outlook\preferences" /v "NewOutlookMigrationUserSetting" /t REG_DWORD /d "0" /f
powershell -command "Get-AppxPackage -AllUsers | Where-Object {$_.Name -Like '*OutlookForWindows*'} | Remove-AppxPackage"
powershell -command "Get-AppxProvisionedPackage -Online | ? DisplayName -like '*OutlookForWindows*' | Remove-AppxProvisionedPackage -Online"
pause
macOS
defaults write com.microsoft.Outlook EnableNewOutlook -int 0