$ADS_NAME_INITTYPE_GC = 3
$ADS_NAME_TYPE_CANONICAL = 2
$ADS_NAME_TYPE_1779 = 1

$cname = "something.YourDomain.com/Business Unit1/Users\/Manufacturing/TUser23"
$NameTranslate = New-Object -ComObject NameTranslate
$NameTranslate.GetType().InvokeMember("Init", "InvokeMethod", $null, $NameTranslate, ($ADS_NAME_INITTYPE_GC, $null)) > $null
$NameTranslate.GetType().InvokeMember("Set", "InvokeMethod", $null, $NameTranslate, ($ADS_NAME_TYPE_CANONICAL, $cname)) > $null
$dname = $NameTranslate.GetType().InvokeMember("Get", "InvokeMethod", $null, $NameTranslate, $ADS_NAME_TYPE_1779)
$dname