I'm currently running IPB 3.2.3 so I'm looking for advice on importing. What username will my members have after importing to xenforo? i.e. IPB has a display name and a username system so which one will act as their login/display name? Is it possible to choose what to import? i.e. members and forums but not threads/posts? Is there anything which the importer will not import? i.e user fields etc?