I am working with a site that has vBulletin 3.x. I am not sure of the exact version number. I'd like to convert it to something modern, supported, and well liked. XF seems to fit that mold. The sites stats are: Threads: 9,223; Posts: 87,267; Members: 2,932. That seems rather small compared to some I see in the forum here. There is currently some weirdness with our register.php being spammed. I imagine this has to do with the version level and vulnerabilities. Would this issue convert over to XF if we switch? Does XF contain built-in CAPTCHA or some other human verification? I'd like to keep spammers at bay as best as I can. I checked the site and all version levels are where they need to be for a XF conversion.