vBulletin 3 is end of life and will not be receiving future development. Warning: vBulletin 3.8.11 is not compatible with PHP 7.2.0 or higher.
Welcome to the vBulletin support forums! In our community forums you can receive professional support and assistance with any issues you might have with your vBulletin Products.
It's actually easier to experience it than explain it. Why don't you switch to it and see? Find a thread with lots of replies, then use the Display link at the top right of that thread to switch.
Comment