i believe you'll find 3 files in your root to handle that redirect.. (if you saved them)..

by 'root' i man you forum root, where ubbthreads.php and index.php are..

those 3 files would need to be modified to do something like:

PHP Code

<?php

header('Location: http://yourforums.com/path/to/forums/');
?>

then any incoming link in the old style, will redirect to the root of your NEW forums..