Sip, de hecho puedes crear los Eventos desde .net y que los usuarios al descargarlo, el Outlook automáticamnete agenda ese evento en su calendario, puedes ver la sgte página para que te des una idea de cómo lo puedes hacer:
//First thing you need to do is add a reference to Microsoft Outlook 11.0 Object Library. Then, create new instance of Outlook.Application object:
Outlook.Application outlookApp = new Outlook.Application ();
//Next, create an instance of AppointmentItem object and set the properties:
Outlook.AppointmentItem oAppointment = (Outlook.AppointmentItem) outlookApp.CreateItem (Outlook.OlItemType.olAppointmentItem);
oAppointment.Subject = "This is the subject for my appointment";
oAppointment.Body = "This is the body text for my appointment";
oAppointment.Location = "Appointment location";
// Set the start date
oAppointment.Start = Convert.ToDateTime ("10/10/2004 10:00:00 AM");
// End date
oAppointment.End = Convert.ToDateTime ("10/10/2004 2:00:00 PM");
// Set the reminder 15 minutes before start
oAppointment.ReminderSet = true;
oAppointment.ReminderMinutesBeforeStart = 15;
//Setting the sound file for a reminder:
set ReminderPlaySound = true
//set ReminderSoundFile to a filename.
//Setting the importance:
//use OlImportance enum to set the importance to low, medium or high
oAppointment.Importance = Outlook.OlImportance.olImportanceHigh;
/* OlBusyStatus is enum with following values:
olBusy
olFree
olOutOfOffice
olTentative
*/
oAppointment.BusyStatus = Outlook.OlBusyStatus.olBusy;
//Finally, save the appointment:
// Save the appointment
oAppointment.Save ();
// When you call the Save () method, the appointment is saved in Outlook. Another useful method is ForwardAsVcal () which can be used to send the Vcs file via email.
Outlook.MailItem mailItem = oAppointment.ForwardAsVcal ();
mailItem.To = "recipients email address";
mailItem.Send ();
Más información la puedes conseguir en esta página:
http://www.outlookcode.com/codedetail.aspx?id=775