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using Microsoft.Office.Interop.Outlook;

Microsoft.Office.Interop.Outlook.Application outlookApplication = new Microsoft.Office.Interop.Outlook.Application(); ;
Microsoft.Office.Interop.Outlook.AppointmentItem appointmentItem = (Microsoft.Office.Interop.Outlook.AppointmentItem)outlookApplication.CreateItem(Microsoft.Office.Interop.Outlook.OlItemType.olAppointmentItem); 

appointmentItem.Subject = "Meeting Subject";
appointmentItem.Body = "The body of the meeting";
appointmentItem.Location = "Room #1";
appointmentItem.Start = DateTime.Now;
appointmentItem.Recipients.Add("test@test.com");
appointmentItem.End = DateTime.Now.AddHours(1);
appointmentItem.ReminderSet = true;
appointmentItem.ReminderMinutesBeforeStart = 15;
appointmentItem.Importance = Microsoft.Office.Interop.Outlook.OlImportance.olImportanceHigh;
appointmentItem.BusyStatus = Microsoft.Office.Interop.Outlook.OlBusyStatus.olBusy;
appointmentItem.Recipients.ResolveAll();
appointmentItem.Display(true);