Courtesy [http://www.macosxhints.com/article.php?story=20050723123302403&lsrc=osxh]
===Auto-complete Williams email addresses===
Auto-complete is a major time saver if you haven't memorized the middle initials of everyone at Williams. Here's how to set it up on Apple Mail running on any version of OS X.
# Open Apple Mail
# Go to Mail -> Preferences...
# Click the "Composing" tab.
# Check the "Automatically complete addresses" box.
# Click "Configure [[LDAP]]..."
# Click the + sign.
# Fill out the fields as shown:
[[Image:Apple_Mail_edit_LDAP_entry.jpg]]
Finally, click "Save", "Done", and close the preferences window.
Now when you compose a message and start to type a name, it will pop up with a list of a bunch of people you've never heard of who go to or work for Williams.
===Connect to a PC===