DCM – Check if User has PST’s mounted in Outlook

I wrote a machine-based rule to check if the environment contains anyone who was actively using PST’s per management request.  Voila:

$primaryUser = "" # use some method to determine the primary user of the machine
$officeVersion = "16.0"
$sid = (New-Object System.Security.Principal.NTAccount($primaryUser)).Translate([System.Security.Principal.SecurityIdentifier]).value

$valuesarray = New-Object System.Collections.ArrayList
New-PSDrive -PSProvider Registry -Name HKU -Root HKEY_USERS -ErrorAction SilentlyContinue | Out-Null

$strOutlookSubkey = "HKU:\$sid\Software\Microsoft\Office\$officeVersion\Outlook\Profiles\Outlook"
$outlookSubkey = (Get-ChildItem "$strOutlookSubkey" -ErrorAction SilentlyContinue).PSChildName

foreach ($key in $outlookSubkey){
    $properties = $null
    $properties = (Get-Item "$strOutlookSubkey\$key").Property
    foreach ($property in $properties){
        if ((Get-ItemPropertyValue -Path "$strOutlookSubkey\$key" -Name $property).GetType().Name -eq 'Byte[]'){
            $valuesarray.Add([System.Text.Encoding]::Unicode.GetString((Get-ItemPropertyValue -Path "$strOutlookSubkey\$key" -Name $property))) | Out-Null
        }
    }
}

$filteredValuesArray = ($valuesarray | ? {$_ -like "*.pst*"}) | % {$_.substring($_.IndexOf(':')-1)} | unique | ? {$_ -notlike "*Internet Calendar Subscriptions*" -and $_ -notlike "*SharePoint Lists*"}

if(!($filteredValuesArray)){"NONE"}
else {$filteredValuesArray}