Exchange server - Not able to send calendar invite if outlook is not installed on the specified server. RRS feed

  • 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)

                    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)
                        agendaMeeting.MeetingStatus =
                        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;
                        log.Info("Invite Successfully 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.

    Tuesday, September 9, 2014 8:40 AM


  • Duplicate post.

    Hope this helps. Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

    Tuesday, September 9, 2014 12:35 PM