Disable inactive AD accounts

Search-ADAccount -UsersOnly -AccountInactive -SearchBase "OU-disginguishedName" -TimeSpan "30" | Disable-ADAccount

Create a scheduled task to run the powershell script...

    <Exec>
      <Command>powershell.exe</Command>
      <Arguments>-ExecutionPolicy Bypass  -File "path-to-ps1-file"</Arguments>
    </Exec>