Good evening,

I am looking for a discussion forum for a small website I am running. I used to use UBB as my forum solution many years ago, but I understand that it has now been replaced with UBB.threads as a portal system. What I am looking for is something along the lines of the message board found here: http://boards.lineage2.com/ubbthreads.php

I saw this site as a featured forum on the main page and it resembles the classic UBB-type forum I am looking for. Does the Linegae II forum use an older version of the UBB.threads product? I was unable to find a version number on there. I tried out the demo here, but was unable to customize it to my liking (resembling the style of the board I linked to).

If anyone knows anything about this, it would be greatly appreciated.

The forum you referenced is using UBB.Threads6. When you purchase a license to UBB.threads you get the ability to download and utilize:
UBB.Classic 6.7.3
UBB.threads 6.5.5
UBB.threads 7.1.1 (7.2 is chugging away in beta right now)

UBB.threads versions prior to 7.x are EOL, however you can still find support from users here who've used it (although 7.x is recommended as it's been heavily optimized from its older countrparts).

The portal system is totally optional as well. You don't need to enable any of it and can just run with just the forum itself.