I've been using vBulletin on my forum since 2001 (currently on Version 4.2.2) and have over a million posts. I've got a few questions:
1) Does Xenforo have their own 'paid subscriptions' function and would it be able to import vBulletin's into this?
2) We've not really used many plugins and do not allow attachments, would anyone expect any issues migrating with 1 million plus posts? (I understand that's a vague question, just looking for some reassurance from similar moves)
3) Do you have your own forum apps like vBulletin? If not, do you have any plans to create them?
Our forum apps have been downloaded by thousands and are regularly used by many members (including myself) so it's important for us to continue with this.