Users should start with the then current "release" version and, when upgrade is appropriate, upgrade to then current "release".

It may not be necessary (or even desirable) to upgrade upon announcment of each new "release", but users should consider upgrading whenever the version they installed is older than the current "stable" release. Versions older than current "stable" release are known to be less reliable.

See http://www.openldap.org/software/download/ for current "release" and "stable" versions.