Hhhhhmmmmm thx Sun Rays... i didn't quite get the answer from ur google key words but i managed get the answer, but thx anyway for ur support... i post the enlightenment for this issue just in case there's someone in the world being order by his/her manager to send outlook meeting request in asp.net apps :p public static void CreateMeetingRequest(string toEmail, string subject, string body, DateTime startDate , DateTime endDate) { Microsoft.Office.Interop.Outlook.Application objOL = new Microsoft.Office.Interop.Outlook.Application(); Microsoft.Office.Interop.Outlook.AppointmentItem objAppt = (Microsoft.Office.Interop.Outlook.AppointmentItem)objOL.CreateItem(OlItemType.olAppointmentItem); objAppt.Start = startDate; objAppt.End = endDate; objAppt.Subject = subject; objAppt.Body = body; objAppt.MeetingStatus = Microsoft.Office.Interop.Outlook.OlMeetingStatus.olMeeting; objAppt.RequiredAttendees = toEmail; objAppt.Send(); objAppt = null; objOL = null; } CreateMeetingRequest(someone@bla.com,"Hello test","Cool it works",DateTime.Now.AddDays(1),DateTime.Now.AddDays(1).AddHours(1));