• upgrade both the source and target websites to the latest available versions of the component
• backup the source and target websites

Migrate core functions with JUpgrade or SP Upgrade or similar so that user ids are preserved.

Export the 24 x Joomla 1.5 Kunena databases with “Quick” and “SQL” options (Note: you can multiple select tables and export them as one file):

• jos_kunena_announcement
• jos_kunena_attachments
• jos_kunena_attachments_bak
• jos_kunena_categories
• jos_kunena_config
• jos_kunena_config_backup
• jos_kunena_favorites
• jos_kunena_groups
• jos_kunena_messages
• jos_kunena_messages_text
• jos_kunena_moderation
• jos_kunena_polls
• jos_kunena_polls_options
• jos_kunena_polls_users
• jos_kunena_ranks
• jos_kunena_sessions
• jos_kunena_smileys
• jos_kunena_subscriptions
• jos_kunena_subscriptions_categories
• jos_kunena_thankyou
• jos_kunena_users
• jos_kunena_users_banned
• jos_kunena_version
• jos_kunena_whoisonline

If necessary, amend table prefixes by searching and replacing all of the old prefixes e.g. jos_ to j25_ inside the file(s).

Delete the 22 x Joomla 2.5 Kunena databases.

Import the Joomla 1.5 Kunena databases into Joomla 2.5.

Copy across files in /media/kunena/attachments/

In Category Manager, reapply the permissions as these don’t seem to be copied across.

References:
http://www.kunena.org/forum/159-K-17-Common-Questions/111394-Transfer-kunena-17-with-joomla-15—in-joomla-17
http://www.kunena.org/forum/159-k-16-and-k-17-common-questions/103459-merged-topic-how-to-move-my-kunena-forum-from-one-site-to-another#103539

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