@jpg

we have exporters for both.

IP.Board
https://github.com/akhoury/nodebb-plugin-import-ipboard

VBulletin
https://github.com/akhoury/nodebb-plugin-import-vbulletin

you don't really need to install any of these 2, just install

https://github.com/akhoury/nodebb-plugin-import

and use the interface the select the right exporter.

Note: hold off a little bit on the source forum with 2M+ posts, I am still in the process of resolving some memory issues