Heap preset on very display forum, on editing posts, there is system filtering spam and checkmate, what tags in governing resolved, and what there is no, protection exile, fine-tuning visual editor for posts + emoticons + BB codes, system personal messages, ranks,', ratings, system organizations polls in themes, subscription on new themes and messages, booting files and the images in messages and many what still.
You can deny access to the forum is not registered, or only to prohibit the creation of new threads. Very powerful system of differentiation of the rights. For example, you can give them access to the forum man for a period of time, which is not in the basis of almost no other forum, without installing additional modules. Powerful message moderation and user management system.
For fans of SEO-a very powerful system of CNC settings, automatic prostanovka nofollow attributes in links in messages, substitution in meta tags of data from the forum topic.
And do forum on Bitrix can be for 10 minutes.