I understand you every time you say it (and I count almost ten) . But do you understand what I'm saying?

A - If bunanson would have used the search the result would have been the same for those threads without "Palm" in the subject. They hadn't "Palm" before and now the search engine can't find them because of the brackets. The rest of the content can be equally found or not-found by the search engine since it doesn't care about subforums. No difference.

B - If the Palm OS subforum would exist still today and bunanson would have got to scan it thread by thread, he would have seen exactly the same threads and in the same sort than this list. No difference.

If A and B show no actual difference with or without subforum, then we can conclude in an Aristotelian way that bunanson would have equally sweat to find that old post with or without subforum.

I think this is a solid argumentation, but I'm ready to see it beaten.