You have to change the "Filtro LDAP" field to the appropriate email field on your LDAP tree, so where you have "AMAccountName=%s" you should have "wtv_name_of_field_you_want_to_check_in_your_LDAP_tree=%s".
Since you have the "Criar utilizador" checked, you have to select a default user in the "Utilizador modelo" dropdown, users that authenticate sucessfully on LDAP will be created on OpenERP db with the same access rights as that default user.
Also, if your server allows anonymous binding, you don't need to fill the "Senha LDAP" field, since you are not going to make changes on LDAP side.
You might want to populate your users and store them in your OpenERP database, for that you'll need to install the "LDAP Populate" module, I advice you to install also the "LDAP mapping for user name and e-mail" in order to map and store users real (full) name and email.
And finaly, note that you can have users that authenticate locally (e.g. admin user) and users that authenticate in LDAP. LDAP is queried after the local database and only when local authentication fails.