How to setup a LDAP directory, How to setup Outlook, IMAP/POP3 setup
Within Outlook you can configure LDAP settings to view Downstate email address when addressing an email.
File/ Info/ Account Settings
Navigate over to the Address Books tab
Click on New... then on Next
After the below information is filled in with your personal user name & password, click on More Settings...
Change the port # to 636 and check the box for Use Secure Sockets Layer
Click Apply and then Finish