>>Thx. Made a huge difference. Interestingly, IIRC, before the fix it would still get there in the end but maybe not actually show all messages in the thread.
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>There is a limit the maximum messages being returned at a time. When this is the case, at the end, there should be a link to move on to the next batch.

Not "not all" in that sense. I've seen this before - the treeview in the upper frame showed, say, seven messages, and the ShowAll would return five. I wouldn't notice except in the cases where it was missing one of the first three. Spotty index. Brings back fond memories of older Microsoft products, when the same table would show a different set of records, depending on how you read it.