EWS API 使用的问题

Question

 与邮件系统日历数据同步，有如下代码：ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2013);
                service.Credentials = new WebCredentials("[email protected]", "Password01!");
                service.Url = new Uri("https://mail.ceshi.com/EWS/Exchange.asmx");                Appointment appointment = new Appointment(service);
                // Set the properties on the appointment object to create the appointment.
                appointment.Subject = "Tennis lesson";
                appointment.Body = "Focus on backhand this week.";
                appointment.Start = DateTime.Now.AddDays(2);
                appointment.End = appointment.Start.AddHours(1);
                appointment.Location = "Tennis club";
                appointment.ReminderDueBy = DateTime.Now;
                // Save the appointment to your calendar.
                appointment.Save(SendInvitationsMode.SendToNone);
                // Verify that the appointment was created by using the appointment's item ID.
                Item item = Item.Bind(service, appointment.Id, new PropertySet(ItemSchema.Subject));
这样的代码，数据是同步进了管理员的邮箱账户，如果我需要根据不用的用户来同步数据，是需要分别设置 service的什么属性。或者Appointment，有实现过的指点一下，谢谢！

Answer 1

Exchange 2013是这个版本的。