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how to get ContactItem from Recipients property by Active directory. I had trid the code and get the ContactItem seccsussful when the Recipients is saved in local contact. how to get the ContactItem when a Recipients was only exists only on Active directory.

public void Application_ItemSend(object mail, ref bool Cancel)
{

        Outlook.MAPIFolder fldContacts = (Outlook.MAPIFolder)Application.Session.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderContacts);

            for (int i = 1; i < mail.Recipients.Count + 1; i++)

            {

                Outlook.Recipient r = mail.Recipients.Item(i);

                if (!r.Resolved) r.Resolve();

                if (r.Resolved)

                {

                    Outlook.ContactItem ci = (fldContacts.Items.Find("[Email1Address] = '" + r.Address + "'") as Outlook.ContactItem);

                    if (ci != null)

                    {

                        //to get the Department of Recipient

                        string DepartmentName = ci.Department;

                    }

                }

            }



    }

You could refer to the below code:

bool resolved;

        Microsoft.Office.Interop.Outlook.Application olApplication = new Microsoft.Office.Interop.Outlook.Application();



        // get nameSpace and logon.

        Microsoft.Office.Interop.Outlook.NameSpace olNameSpace = olApplication.GetNamespace("mapi");

        olNameSpace.Logon("Outlook", "", false, true);



        // get the Calender items

        Microsoft.Office.Interop.Outlook.MAPIFolder _olCalender = olNameSpace.GetDefaultFolder(Microsoft.Office.Interop.Outlook.OlDefaultFolders.olFolderCalendar);



        // Get the Items (Appointments) collection from the Calendar folder.

        Microsoft.Office.Interop.Outlook.Items oItems = _olCalender.Items;







        foreach (object o in oItems)

        {



            if (o is Microsoft.Office.Interop.Outlook.AppointmentItem)

            {

                Microsoft.Office.Interop.Outlook.Recipients recipients = ((Microsoft.Office.Interop.Outlook.AppointmentItem)o).Recipients;

                foreach (Microsoft.Office.Interop.Outlook.Recipient rec in recipients)

                {

                    resolved = rec.Resolve();

                    if (resolved)

                    {

                        Microsoft.Office.Interop.Outlook.ContactItem contactItem = rec.AddressEntry.GetContact();



                    }

                }



            }

        }

For more information, Please refer to this link:

C# Outlook get CompanyName property from Recipient

just change the code like the folowing:

Outlook.ContactItem ci =
(fldContacts.Items.Find("[Email1Address] = '" + r.Address + "'") as Outlook.ContactItem);

change to
ExchangeUser contactItem = recip.AddressEntry.GetExchangeUser();