# --------------------------------------------------------------------
<#
#
# Outlook-New-Entfernen.ps1
# 
# Outlook-New:
# .   Vom Rechner entfernen
# .   Bei allen Benutzern entfernen
# .   Automatische Umstellung deaktivieren
# 
# Parameter : -
# 
# 2025-03-04/Rc : Initiale Version
# 2025-03-08/Rc : Entfernen von Windows-Mail integriert
# 
#>
# --------------------------------------------------------------------

# ----- Paket vom Rechner entfernen: Kuenftige Benutzer koennen kein Outlook-New mehr erhalten -----
# https://learn.microsoft.com/de-de/microsoft-365-apps/outlook/get-started/control-install
# https://administrator.de/knowledge/zuverlaessiger-remove-appxprovisionedpackage-ausfuehren-in-w10-1803-389143.html
# https://www.reddit.com/r/PowerShell/comments/1bprao8/trying_to_use_removeappxprovisionedpackage_always/

$PackageName = "Microsoft.OutlookForWindows"

Get-AppxProvisionedPackage -Online | Where-Object -Property PackageName -match $PackageName | Remove-AppxProvisionedPackage -Online
 
# ----- Outlook-New bei allen definierten Benutzern entfernen
# https://answers.microsoft.com/en-us/outlook_com/forum/all/how-to-remove-outlook-new-app-for-all-users-also/ae321ce0-fd3a-4a5c-b0fb-28d75281fb5a

Get-AppxPackage -AllUsers | Where-Object {$_.Name -Like $PackageName} | Remove-AppxPackage -AllUsers -ErrorAction Continue

# ----- Deaktivierung der automatischen Umstellung auf Microsoft Outlook New -----
# https://learn.microsoft.com/de-de/microsoft-365-apps/outlook/get-started/control-install)
# https://apps.datev.de/help-center/documents/1037821

$RegistryPath = "HKCU:\Software\Policies\Microsoft\office\16.0\Outlook\Preferences"
$Name         = "NewOutlookMigrationUserSetting"
$Value        = "0"
$PropertyType = "DWORD"
# Create the key if it does not exist
If (-NOT (Test-Path $RegistryPath)) {
  New-Item -Path $RegistryPath -Force | Out-Null
}  
# Now set the value
New-ItemProperty -Path $RegistryPath -Name $Name -Value $Value -PropertyType $PropertyTyp -Force 

# Zweite Policy (https://learn.microsoft.com/en-us/microsoft-365-apps/outlook/manage/admin-controlled-migration-policy):

$RegistryPath = "HKCU:\Software\Policies\Microsoft\office\16.0\Outlook\Options\General"
$Name         = "DoNewOutlookAutoMigration"
$Value        = "0"
$PropertyType = "DWORD"
# Create the key if it does not exist
If (-NOT (Test-Path $RegistryPath)) {
  New-Item -Path $RegistryPath -Force | Out-Null
}  
# Now set the value
New-ItemProperty -Path $RegistryPath -Name $Name -Value $Value -PropertyType $PropertyTyp -Force 

# Policy, um automatisches Öffnen von Microsoft Outlook new beim Starten vom Microsoft Outlook zu deaktivieren (https://support.microsoft.com/en-us/office/toggle-out-of-the-new-outlook-for-windows-preview-ec102b39-5727-418e-ae1f-a1805434640c):

$RegistryPath = "HKCU:\Software\Policies\Microsoft\office\16.0\Outlook\Preferences"
$Name         = "UseNewOutlook"
$Value        = "0"
$PropertyType = "DWORD"
# Create the key if it does not exist
If (-NOT (Test-Path $RegistryPath)) {
  New-Item -Path $RegistryPath -Force | Out-Null
}  
# Now set the value
New-ItemProperty -Path $RegistryPath -Name $Name -Value $Value -PropertyType $PropertyTyp -Force 

# Policy zur Intervallsteuerung zwischen Migrationsversuchen (https://learn.microsoft.com/en-us/microsoft-365-apps/outlook/manage/admin-controlled-migration-policy):

$RegistryPath = "HKCU:\Software\Policies\Microsoft\Office\16.0\Outlook\Options\General"
$Name         = "NewOutlookAutoMigrationRetryIntervals"
$Value        = "0"
$PropertyType = "DWORD"
# Create the key if it does not exist
If (-NOT (Test-Path $RegistryPath)) {
  New-Item -Path $RegistryPath -Force | Out-Null
}  
# Now set the value
New-ItemProperty -Path $RegistryPath -Name $Name -Value $Value -PropertyType $PropertyTyp -Force 

# Policy, um Schalter „Neues Outlook testen” auszublenden (https://learn.microsoft.co; m/de-de/exchange/clients-and-mobile-in-exchange-online/outlook-on-the-web/enable-disable-employee-access-new-outlook):

$RegistryPath = "HKCU:\Software\Policies\Microsoft\office\16.0\Outlook\Options\General"
$Name         = "HideNewOutlookToggle"
$Value        = "1"
$PropertyType = "DWORD"
# Create the key if it does not exist
If (-NOT (Test-Path $RegistryPath)) {
  New-Item -Path $RegistryPath -Force | Out-Null
}  
# Now set the value
New-ItemProperty -Path $RegistryPath -Name $Name -Value $Value -PropertyType $PropertyTyp -Force 

# ----- Windows-Mail entfernen -----
# https://www.reddit.com/r/sysadmin/comments/bxznso/uninstall_windows_10_mail_app_for_all_users/?tl=de

Write-Output "Windows 10 Mail Appx-Paket entfernen"

if(Get-AppxPackage -Name Microsoft.windowscommunicationsapps -AllUsers){
    Get-AppxPackage -Name Microsoft.windowscommunicationsapps -AllUsers | Remove-AppxPackage -AllUsers -Verbose -ErrorAction Continue
}
else {
    Write-Output "Mail-App ist für keinen Benutzer installiert"
}

if(Get-ProvisionedAppxPackage -Online | Where-Object {$_.DisplayName -match "Microsoft.windowscommunicationsapps"}){
    Get-ProvisionedAppxPackage -Online | Where-Object {$_.DisplayName -match "Microsoft.windowscommunicationsapps"} | Remove-AppxProvisionedPackage -Online -AllUsers -Verbose -ErrorAction Continue
}
else {
    Write-Output "Mail-App ist nicht für das System installiert"
}