public string CreateAppointmentInOutlook(AppointmentEntity appointmentEntity)
 {
     Trace.TraceInformation("CreateAppointmentInOutlook");
     if (!InitializeHelpers())
     {
         return("Initialize helpers fail");
     }
     if (!string.IsNullOrEmpty(appointmentEntity.OutlookId))
     {
         Trace.TraceInformation("CreateAppointmentInOutlook: appointment exist in outlook");
         return(appointmentEntity.OutlookId);
     }
     appointmentEntity.OutlookId = exchangeHelper.CreateNewOutlookAppointment(appointmentEntity);
     //crmHelper.UpdateCrmAppointment(appointmentEntity);
     return(JsonConvert.SerializeObject(appointmentEntity.OutlookId));
 }