I have two Exchange 2007 in Exchange organization. All roles (except Edge and UM role) are on one server (one physical server for each Exchange server). One Exchange server is production with valid SSL certificate and one is test with self-sign certificate. Occasionally Outlook 2007 goes to test Exchange server to use EWS and then users get certification warning about certification trust (because test Exchange have self-sign certificate).
How Outlook 2007/2010 choose which Exchange Web Service to use and is it possible to control that?