Just install a base SME server, then install smeserver-kronolith, smeserver-nag, and smeserver-mnemo from the smedev repo which should pull in the dependent kronolith-h3, nag-h3, and mnemo-h3 and you will will have horde groupware webmail edition. Then signal-event post-upgrade ; signal-event reboot. The individual files are also the equivalent of all of the files together, there is no functional difference. The groupware editions just add a script to install all of the components at one time.
John