Thanks for all the information. I have purchased your addon to see if it is what I need.
In regards to importing vbulletin groups: If I can retain the IDs of the groups, then I would be able to do a simple htaccess redirection without the need for a redirection script for the groups itself. Grou0p threads would still need a redirection script.
But retaining the group discussion ID's would overwrite forum threads. So I assume that I cant select 'retain IDs' in the importer.
Is there a possibility to retain the group ID's, but not the group discussion IDs?
Also: if I uninstall this addon, then will it remove all data? (this would allow me to run several tests)