public async Task ExecuteLoginMicrosoftCommandAsync()
{
if (client == null || IsBusy)
return;
Settings.LoginAccount = LoginAccount.Microsoft;
var track = Logger.Instance.TrackTime("LoginMicrosoft");
track?.Start();
IsLoggedIn = await LoginAsync(MobileServiceAuthenticationProvider.MicrosoftAccount);
track?.Stop();
Logger.Instance.Track("LoginMicrosoft");
}