Hi RubenRocha,
thanks. I'm thinking (without having looked at the database layout yet, so that might still be a bust) that I extract a dump with the thread-ids matched to the post-ids. This assumes the thread-id still exist in the database. With that mapping table, I should be able to patch all the links to get_topic we still have. We might lose the post position within the thread, but that is the lesser of two evils.
Annette, I'll send you a mail regarding the query details sometime during the weekend.

Michael