Daley, I've updated the RPMs and the install procedure. You'll want to install (at a minimum) horde, imp, turba, and the e-smith- packages for each of these. Then, all you need to do is
/sbin/e-smith/signal-event horde-update
Brad, I haven't tested it at all on 5.5; if it works, great, but the idea is only for 5.6.