Synchronize AD changes with synchronization cookie and PowerShell

AD_cookie_sync.ps1

# Define a path to file to store cookie 
$CookiePath="C:\Windows\Temp\cookie.ad"

# Domain connection entry & searcher obj
$objDomain = New-Object System.DirectoryServices.DirectoryEntry("LDAP://domain.local")
$objDirectorySearcher = New-Object System.DirectoryServices.DirectorySearcher($objDomain)

# Filter and associated settings for searcher
$ldapFilter = "(objectclass=Computer)"
$objDirectorySearcher.Filter = $ldapfilter


$objDirectorySearcher.PropertiesToLoad.Add("name") 
$objDirectorySearcher.PropertiesToLoad.Add("distinguishedName") 

$objDirectorySearcher.ExtendedDN = [System.DirectoryServices.ExtendedDN]::Standard

# Create new dir sync object and associate it with searcher 
$objDirSync = new-object System.DirectoryServices.DirectorySynchronization

# If we have already cookie lets use it in subsequent query 
if(Test-Path $CookiePath) 
{
    $objDirSync.ResetDirectorySynchronizationCookie( ([System.IO.File]::ReadAllBytes($CookiePath)) ) 
}

$objDirectorySearcher.DirectorySynchronization = $objDirSync

# look for all objects now 
$allResults = $objDirectorySearcher.FindAll()

# get our synchronization cookie - this is where the mahic begins :) 
$adSyncCookie = $objDirSync.GetDirectorySynchronizationCookie()

# Write all bytes to file for future use
[System.IO.File]::WriteAllBytes($CookiePath, $adSyncCookie)