<A target="_blank" href="http://kbild.ch/2011/08/using-ssl-in-sametime-8-5-x-for-ldap-connection-part-1/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+kbild+%28kbild+-+Mehr+als+die+gelbe+Welt%29">Klaus Bild has posted Part 1 of his explanation on securing a connection to an LDAP server</A> for Sametime 8.5. He's included lots of screen shots to help you set things up.