Outlook Calendar invite - Not able to send from exchange server.

Question

Hi,
   I am not able to send outlook calendar invite from exchange server. But if i installed outlook on my local machine/server it works fine. Below code the i used to build calendar invite for your reference.
  public static void sendOutlookInvitationViaICSFile1(EAppointmentMail objApptEmail)
            try
                log.Info("Invite Started");
                Microsoft.Office.Interop.Outlook.Application apptApp = new Microsoft.Office.Interop.Outlook.Application();
                Microsoft.Office.Interop.Outlook.AppointmentItem agendaMeeting = apptApp.CreateItem(Microsoft.Office.Interop.Outlook.OlItemType.olAppointmentItem);
                DateTime venueDate = Convert.ToDateTime(objApptEmail.VenueDate);
                string formatedVenueDate = venueDate.Year.ToString() + "/" + venueDate.Month.ToString() + "/" + venueDate.Day.ToString();
                DateTime from = Convert.ToDateTime(formatedVenueDate + " " + objApptEmail.FromTime);
                DateTime to = Convert.ToDateTime(formatedVenueDate + " " + objApptEmail.ToTime);
                System.Net.Mime.ContentType typeHTML = new System.Net.Mime.ContentType("text/html");
                //Create the Body in HTML format
                string strBodyText = "Type:Single Meeting\r\nOrganizer: {0}\r\nStart Time:{1}\r\nEnd Time:{2}\r\nTime Zone:{3}\r\nLocation: {4}\r\n\r\n\r\n\r\n{5}";
                strBodyText = string.Format(strBodyText, objApptEmail.Email, from.ToLongDateString() + " " + from.ToLongTimeString(),
                                    to + " " + to, System.TimeZone.CurrentTimeZone.StandardName,
                                    objApptEmail.Location, objApptEmail.Body);
                if (agendaMeeting != null)
                    Console.WriteLine("started");
                    agendaMeeting.MeetingStatus =
                        Microsoft.Office.Interop.Outlook.OlMeetingStatus.olMeeting;
                    agendaMeeting.Location = objApptEmail.Location;
                    agendaMeeting.Subject = objApptEmail.Subject;
                    agendaMeeting.Body = strBodyText;
                    agendaMeeting.Start = from;
                    agendaMeeting.End = to;
                    Microsoft.Office.Interop.Outlook.Recipient recipient = agendaMeeting.Recipients.Add(objApptEmail.Email);
                    recipient.Type = (int)Microsoft.Office.Interop.Outlook.OlMeetingRecipientType.olRequired;
                    ((Microsoft.Office.Interop.Outlook._AppointmentItem)agendaMeeting).Send();
                    log.Info("Invite Successfully End");
                    Console.WriteLine("End");
            catch (Exception ex)
                log.Info("Error: " + ex.Message.ToString());
                Console.WriteLine("Error: " + ex.Message.ToString());
In exchange server/ not outlook installed server, i am getting below error.
"Retrieving the COM class factory for component with CLSID {0006F03A-0000-0000-C000-000000000046} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))"
Help me to send calendar invite without installing outlook on the specified server. Please do the needful.

Answer 1

Hi
It is probably that the stuff you doing is for outlook and because outlook is not installed it cannot find the classes.
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