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"You know, there was a phase when GC told you "it seems that the message has already been posted" if you had posted a message with the similar title 10 or 100 years ago."

I think that is still the case, but only for messages at the same position in the hierarchy of messages - which is particularly noticeable if you want to post a "Happy New Year's!" message at the top level on the board, only to be refused because you made a top level post with the same subject line twelve years ago.