Ldapsearch and LDAP:// problem

Hi! I have a problem with ldap query to my server domino. If I write ldapsearch -h myserver -b “o=myorg” -s subtree “(mail=*)” mai, the ldap server respond corretly. If I try to do ldap://myserver (on my IE) and I send an ldap query to search my email address, I receive a message that nothing name found. Why?Help!!!