Kunena Importer lets you import data from other forums like
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Agora
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CCBoard
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Discussions
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JoomBB
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NinjaBoard
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phpBB3
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phpBB2
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PNphpBB2
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SMF2
Requirements: Joomla 1.5 / 2.5, Kunena Forum 2.0
Install com_kunenaimporter via the Joomla extension manager.