The plugin needs a bit of work as @julian keeps QQing about 😄
It's not part of core, and in the near future I'd like to resolve them!
@Chad this plugin provides support for importing from xenforo. https://github.com/akhoury/nodebb-plugin-import
There is one catch with that plugin. You will have to install NodeBB v1.0.0... complete the import and then upgrade NodeBB to latest version.
Chats are integrated into NodeBB. No plugin required. Supports one-to-one and group chats.