We are using Outlook 2003 connecting to a corporate LDAP server.
I can add the LDAP server into Outlook, and it searches the server fine
returning SMTP addresses. However, we need the X400 addresses instead.

I have changed the following values:
6605001e=X400
6606001e=textEncodedORaddress
But this did not work.

However, if I set the following:
6605001e=X400
6606001e=mhsoraddress
This does return X400 addresses in the address book - but only when
selecting the address you want from the list of matches.

When you have selected the correct address, it adds the display name to the
"To" box, if you then bring up the properties for that name, it shows the
SMTP address, and any emails fail to reach their destination, resulting in an
NDR (syntax error).

'All' I want to be able to do is search the LDAP directory, and return an
X400 address. It doesn't even need to populate the "To" box with the display
name (although this would be the ideal situation), the full common name will
suffice, as long as the email gets to the destination.