The UNIX version was a good product. It worked and worked well. Depending on who you speak with you'll probably get a different story on why or why the product isn't around today. Some may say it didn't have a third-party developer following, others might say it was too costly....
I believe part of the reason is the same reason you don't see bulletin boards -- the Internet and web sites came to town. Market winds shifted towards other directions and bulletin boards weren't as popular, and weren't required.
It's too bad, but as far as I know this is the only remaining web site of information about this forgotten product. Please let me know if you find any other references on the 'net.