For authentication and vCards we're using a custom LDAP backend. And XEP-0313 Message Archive Management didn't exist when we had to implement a custom solution

For authentication and vCards we're using a custom LDAP backend. And XEP-0313 Message Archive Management didn't exist when we had to implement a custom solution, especially on behalf of german archive law §146AO and §239HGB. We did put a lot individual developement in a solution I can't economically justify burying now.