Sample script that searches Active Directory for all the OUs that have the word Server in their name. The Name attribute is replicated to the Global Catalog. This means you can connect to a Global Catalog server and search across the forest for all organizational units with a specified name.

$strFilter = "(&(objectCategory=organizationalUnit)(name=*Servers*'))"

$objDomain = New-Object System.DirectoryServices.DirectoryEntry

$objSearcher = New-Object System.DirectoryServices.DirectorySearcher
$objSearcher.SearchRoot = $objDomain
$objSearcher.PageSize = 1000
$objSearcher.Filter = $strFilter

$colProplist = "name"
foreach ($i in $colPropList){$objSearcher.PropertiesToLoad.Add($i)}

$colResults = $objSearcher.FindAll()

foreach ($objResult in $colResults)
    {$objItem = $objResult.Properties; $}