instant LDAP query - HOW?

[Curtis Vaughan]

We have Outlook 2003 which is set up to query an outside LDAP server.
Many email clients when querying this server will begin to show you
possible names as you enter the person to whom you wish to send the
letter. That is, say I wish to send a letter to John Downing. I don't
know John's email address, but I know it's on that LDAP server. So I
start typing in Joh.. and I get a list of all names and addresses that
have the combination of joh in them.
I have never seen Outlook (any version) be able to do this. In fact in
my case even if I enter joh, it won't show me possible options from the
LDAP server, even if I click on the Check Names icon. Only if I entered
the full name John Downing will it then show me his entry in the LDAP
server. That's absurd.
I can of course query the LDAP server another way. I have to go to
address book, choose the LDAP server, click on Advanced, then Find, then
enter the letters to query by. The search will then pull up a list of
possibilities.
Also, a lot of email clients will let me enter an asterick in order to
query the entire LDAP database, but Outlook won't.

Is there any way to get the functionality that I am referring to in Outlook?

Curtis