Also for those who do not have RHEL/AS4 which is commercial:
RedHat FedoraCore3 RHFC3 (which is free) includes RPMs for OpenLDAP
2.2.13 and cyrus-sasl 2.1.19.
Without wanting to start some Distro-Flame here, I would suggest going
with the free RHEL clones (CentOS for example), for any server
application. FC3 might work, but the EL-type offerings have the
explicit goal of being server-grade and stable. FC3 does not.