[otrs] Changing auth type from local to ldap for agents

Hi, I'm using OTRS only internally, so I use ldap backend for clients, but at first I didn't know if it would cause problem with agents so the auth for agent is local. I have a few questions about the possible transition to ldap auth for agents. - Can an agent be a customer as well if using the same AD for auth? Of course, I guess that agents would be in an extra AD group compared to the users. - Will I lose agent history or will I break something if I go with ldap auth instead of local eventually? The usernames and e-mail addresses are the same. Thanks, Ugo