Necro-posting is easy to do when you’re a newer member. Being new myself, I’ve already committed this fuax pas. It’s due, in part, to nearly every post showing as unread or new. In an effort to be self-reliant and read is much as I can, and to avoid Jerry’s chastening, I read and read, and then respond before I realize I’m looking at a post several months old.
It may be prudent that when new members register, all existing posts are marked as read. Of course, from that point forward, anything new shows as unread. Then, when searching or reading, it will be easier to know “this is an old post, maybe I should not respond to it.” Likewise, new “unread” posts are open season.