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When client certificates are enabled, and anonymous and name and password authentication are disabled for LDAP,
Notes/Domino LDAP client and Netscape 4.6 are the only clients that send the client certificate over LDAP when requested by the Domino LDAP server.

Microsoft Outlook Express currently does not send a client certificate when requested by the server, when using LDAP, therefore if you are using Microsoft Outlook as your LDAP clients and SSL you would need to enable name and password or anonymous authentication in order to communicate.