EWS Connect with SharePoint, Performance

For my experience using EWS with SharePoint I want to share some useful information.

When you connect to Exchange Online with SharePoint a big performance improvement is to write a console application in order to get your Service URL and pass it directly. But to do this SharePoint ask you for a certificate, the workaround is to pass a Dummy X509 CER, code bellow, comment if it help.

// <summary>
/// Gets the binding.
/// </summary>
/// <returns></returns>
public static ExchangeService GetBinding()
{
    try
    {
        //Create Service
        ExchangeService service = new
            ExchangeService(ExchangeVersion.Exchange2010_SP1);
        //Assign Credentials
        service.Credentials = new
            WebCredentials("admin@contoso.com", "password");
        ServicePointManager.ServerCertificateValidationCallback +=
            RemoteCertificateValidationHandler;
        //Change this line by your EndPoint Url
        service.Url = new Uri("https://SERVER.outlook.com/EWS/Exchange.asmx");
        return service;
    }
    catch (AutodiscoverRemoteException ex)
    {
        Console.WriteLine("Exception thrown: " + ex.Error.Message);
        return null;
    }
}

private static bool RemoteCertificateValidationHandler
    (object sender, X509Certificate certificate,
    X509Chain chain, SslPolicyErrors sslPolicyErrors)
{
    return true; //ignore the checks and go ahead
}