From the infopop website http://www.infopop.com/products/ , it would appear there are 3 basic products: Ultimate Bulletin Board (what we have), UBBThreads, and Open Topic.

I cannot find that preview post is available in the Ultimate Bulletin Board feature set descriptions. It does appear to be available in the UBBThreads - actually there seems to be some really cool technical and feature options in both UBBThreads and OpenTopic..

Here's a link to "UBBThread" features that were available in version 5.4 . Note that there is a vague reference to "preview post" as a user-toggled feature...

Preview post
The user can edit his/her profile to turn the preview post screens on or off.

http://www.infopop.com/products/ubbt.../features.html

Of course, this is just interesting conversation. They aren't giving this stuff away, nor are they sending IT staff to do conversions, maintenance, etc. So maybe we should remind ourselves that what we have is pretty good after all ...