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Hi all,

I have created a VSTO (Appointments) application targeting Outlook 2003. The thing is that I have no idea how to get hold of the email address of the recipients of the appointment. I am well aware that in Outlook 2007 VSTO, one can use the following piece of code to get hold of the email address, but this does not work in Outlook 2003:

I wrote the following method that does get hold of the recipients email address, but it makes use of LDAP, this is a problem seeing that each client will require a username and password....
public string LookupEmailAddress(string legacyExchangeDN)
    string emailAddress = String.Empty;
    DirectoryEntry de = new DirectoryEntry("LDAP://server.local", "username", "password");
    DirectorySearcher deSearch = new DirectorySearcher();
    deSearch.SearchRoot = de;
    deSearch.Filter = "(&(objectClass=user)(legacyExchangeDN=" + legacyExchangeDN + "))";
    deSearch.SearchScope = SearchScope.Subtree;
        SearchResult results = deSearch.FindOne();
        if (!(results == null))
            de = new DirectoryEntry(results.Path, "username", "password", AuthenticationTypes.Secure);
            foreach (System.DirectoryServices.PropertyValueCollection o in de.Properties)
                if (o.PropertyName == "mail")
                    emailAddress = o.Value.ToString();
    catch (System.Exception)
        return String.Empty;
    return emailAddress;

Does anyone know how I can get hold of the email address of the recipients attending the appointment / meeting?

Many thanks in advance.
Kind regards,

[Corrected code formatting]
Updated 8-Mar-10 2:28am

I am running into the same problem. I've found one solution

applicationObject.GetNamespace("MAPI").AddressLists["Global Address List"].AddressEntries["USER NAME"].Details(0);

applicationObject is the pointer to your Outlook Application, and "USER NAME" is pretty much the sender's user name. This does not solve my problem but hopefully it solves yours

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