Configure your LDAP client with the local IP address of your server, port number 389, and the server root parameter as dc=yourdomain,dc=com (or,net, org, edu, etc.)
For Outlook 2000:
1)Tools->Accounts->Directory-Services(Tab)->
[Add]->Directory-Service
Internet directory (LDAP) server: __some-name__
Logon is *NOT* required
[Next]
Check Email Addresses: __your-choice-Yes-or-No__
[Next]->[Finish]
Click the [Properties] button
General Tab
Fill-in the server name (or IP address)
Advance Tab
Server Port Number: __389__
Search Base: __dc=yourdomain,dc=com___
Click [OK], then [Close]