Hi all I'm connecting to ExchangeServer with username,password,doain properities(my code below) but what how to define server uses Kerberos,ntlm or basic authentication e.g? thnx

xchangeServiceBinding binding = new ExchangeServiceBinding();
        ServicePointManager.ServerCertificateValidationCallback = CertificateValidationCallBack;

        System.Net.WebProxy proxyObject = new System.Net.WebProxy();
        proxyObject.Credentials = System.Net.CredentialCache.DefaultCredentials;
        if (string.IsNullOrEmpty(credentials.UserName) || string.IsNullOrEmpty(credentials.Password) || string.IsNullOrEmpty(credentials.Domain))
            throw new ArgumentNullException("The Crediantial values could not be null or empty.");
        binding.Credentials = new NetworkCredential(credentials.UserName, credentials.Password, credentials.Domain);
        if (string.IsNullOrEmpty(serverURL))
            throw new ArgumentNullException("The Exchange server Url could not be null or empty.");
        binding.Url = serverURL;

        binding.UseDefaultCredentials = true;
        binding.Proxy = proxyObject;

        //TO DO:take version over parameter..or configration!!
        binding.RequestServerVersionValue = new RequestServerVersion();
        binding.RequestServerVersionValue.Version = (ExchangeVersionType)Enum.Parse(typeof(ExchangeVersionType), serverVersion);// ExchangeVersionType.Exchange2007_SP1;//.Exchange2010;