There's another way to keep them sorted out which we used on another Ask the Expert where we had very long threads (pages) where the Expert would chime in at the end of the day. We started out with the default sort of oldest --> newest, but then you could never tell what the Expert post referred to. In the Lithium admin tool, there's a setting for "Linear Format Message Sorting Order within Threads" -- set it to "Sort by threading" (you can do this on a board-by-board basis). Then, if the Expert clicks the Reply button on a specific message, the reply will appear right after it. It has pros and cons -- the pro: when you read through a whole thread, the conversation is obvious; the con: if you pop in once a day to see what is new... you cant find it because the new posts are embedded with their antecedents.
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