I made this mod after being requested at my forum by a user and thorught to share it here as well in case other users will find a use for it as well
http://www.forumservices.eu/showthre...-hack-from-Ipb
ANyway this hack will allow you to show the first post to guests and hide the rest. You can enable and disable from the Acp where you can add the message that you want to be displayed to guests instead of the post. You can also choose forums to be excluded from the hide post limit.
Screenshots:
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