Sample script that searches Active Directory for all computers that have logged on to a domain controller at least once. The logonCount attribute is not replicated to the Global Catalog; you cannot connect to a Global Catalog server and search across the forest for computers that have logged on a specified number of times. Note that this attribute is not replicated within a domain, either. To determine the number of times a computer has logged on, you will have to retrieve this value from each domain controller.

$strFilter = "(&(objectCategory=Computer)(logonCount>=1))"

$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; $}