public MailStoreProviderSDK(string userName, string password)
            : base(userName, password)
        {
            _outlookClient = GetOutlookClient("Mail");

            _user = _outlookClient.Me.ExecuteAsync().Result;

            DisplayName = _user.Id;
            RootFolder = new MailFolderProviderSDK(_outlookClient, _user.Id);
        }
        public MailStoreProviderSDK(string userName, string password)
        {
            _adClient = AuthenticationHelperSDK.GetGraphClientAsync(userName, password).GetResult();
            _outlookClient = GetOutlookClient("Mail");

            _user = _outlookClient.Me.ExecuteAsync().GetResult();

            DisplayName = _user.Id;
            RootFolder = new MailFolderProviderSDK(_outlookClient, _user.Id);
        }