Entourage 2004 & Exchange 2003


There seems to many users asking for support for this problem but I don't find a the answers that I am looking for
1) It says in the Documentaion to put in the DNS for the domain controler ie:, no change

2) It says to have LDAP running, but how do I know if is running ? or how to install LDAP ?

3) When I try to access OWA from "IE" it comes up with "invaldid cetificate" but it will let me in with "Safari" is there something with MS that is blocking it ?

PC Expert