I've done what I can to repair the
Help Index—by reposting my own messages from an archive of my message history I happened to have.
Nostra, that "optimizing" had a rather devastating effect on this particular topic. I suppose that may because all of the messages lost were rather old. The archive I restored them from created in December 2008. But I'm concerned about what else may be gone. Is there a way you can describe what messages were removed? It's obviously not everything before a certain date—my message history still goes back to day 1.
Oh, but wait. We do have an indicator of the impact of whatever this is. According to my stats, I've posted 2,230 messages—but there are only 1,689 in my history. So it would seem I've lost over 500 messages (a handful were deleted by me). Your situation looks even worse—646 of 2,128 missing. It seems only members who have been around since before the middle of last year are affected. So maybe there is some connection with the fact the Support and Feature Suggestion forum messages only go back to June 2009?
BTW, I'm not expecting you to recover lost messages. But it would be helpful to understand what's gone so I don't waste time looking for it.