These instructions are for Outlook 2011 on the Mac. Windows should be similar.
Launch Outlook 2011 and goto Tools and then Accounts.
Click the + button on the bottom left to add a new Directory Service.
Enter the server information as shown. You can use ds1-lon.entic.net if you are in Europe.
Enter User name and password as shown and click Advanced. The user name is called the Bind DN in LDAP language.
Enter Search Base to be the same as the User name.