/// <summary>
 /// static executor functions for easy multi-threading
 /// </summary>
 public static List<String> ExecuteO365Verify(string adminusername, string adminpassword, string userupn, string localdomain)
 {
     VerifyController controller = new VerifyController(adminusername, adminpassword);
     return controller.O365Verify(userupn, localdomain);
 }