[exim] Fedora Directory Server for LDAP

Does anyone here have experience using--or trying to use and failing--Fedora
Directory Server as the server for LDAP queries from Exim?

I'm not asking for research--just experience, successful or not. The list
archive and the Wiki appear to be silent on the issue.

(We currently use OpenLDAP, only for authentication. In building up a new
batch of servers, we're at least idly considering FDS.)

Thanks.

--John