Disable all Outlook add-ins except for a specified list

Disable-OutlookAddins.ps1

# List of add-in names that ARE permitted. Everything else will be disabled
$permittedAddIns = "Redemption.Addin","WorkSiteEmailManagement.Connect","imFileSite.Connect"

# Registry paths to search
$registryPaths = "Registry::HKEY_USERS\S-1-5-21-*\Software\Microsoft\Office\Outlook\Addins",
                 "Registry::HKEY_USERS\S-1-5-21-*\Software\Wow6432Node\Microsoft\Office\Outlook\Addins",
                 "HKLM:\Software\Wow6432Node\Microsoft\Office\Outlook\Addins",
                 "HKLM:\Software\Microsoft\Office\Outlook\Addins"

# Build up a list of add-ins by searching the specified paths
$addIns += ($registryPaths | ForEach-Object {Get-Item $_ | Get-ChildItem | Where-Object -Filter {($_.GetValue("LoadBehavior") -and $_.GetValue("LoadBehavior") -ne 0)}})

# Narrow down our list of add-ins to only those that don't match our permitted list
$deniedAddIns = $addIns | ? {$_.PSChildName -notin $permittedAddIns}

# Loop through all of the denied add-ins, and set the LoadBehavior
foreach ($addin in $deniedAddIns) {
    # If the current add-in's LB is already set to 0. Skip this one.
    if ($addin.GetValue("LoadBehavior") -eq 0) { continue }

    # Set the LoadBehavior to zero
    Set-ItemProperty -Path "Registry::$($addin.Name)" -Name "LoadBehavior" -Value 0 -WhatIf
    
}