IMP 3.0 Options / prefs activation

[Cliff R. Pearson]

Please forgive a silly questions, but I was wondering what the
dependencies are for the Options feature of imp 3.0 to show up.

In webroot/horde/imp/templates/menu/menu.inc I see:
}
if (($conf['prefs']['driver'] != '') && ($conf['prefs']['driver'] !=
'none')) {
    Menu::printItem(Horde::applicationUrl('prefs.php'), _("Options"),
'prefs.gif', $registry->getGraphicsPath("horde"));
}

Removing the if causes the button / link to light up, but notta on
functionality.

What is this checking for? I'm guessing it's something to do with
database tables or setting, but I don't know what all it needs. The
databases for turba, horde and imp are all set up, but it looks like I
missed something.

Thanks,
Cliff