we have exporters for both.
you don't really need to install any of these 2, just installGitHub - akhoury/nodebb-plugin-import: migrate your old crappy forum to NodeBB
migrate your old crappy forum to NodeBB. Contribute to akhoury/nodebb-plugin-import development by creating an account on GitHub.favicon
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