$searchScopes = "HKCU:\SOFTWARE\Microsoft\Office\Outlook\Addins","HKLM:\SOFTWARE\Wow6432Node\Microsoft\Office\Outlook\Addins"
$searchScopes | % {Get-ChildItem -Path $_ | % {Get-ItemProperty -Path $_.PSPath} | Select-Object @{n="Name";e={Split-Path $_.PSPath -leaf}},FriendlyName,Description} | Sort-Object -Unique -Property name