OK looking on Google it looks like that format was used as recently as 2006. However, I don't feel like maintaining large tables long term in the future to make the links work exactly. There's no way I could track down and get all the sites out there to change their links.
What would code be to put into postlist.php - if that is just a redirect page - to have it simply go to the main new forum? Is that the only page I'd need to change?