I would second the need to migrate. This forum software has a really dated look, it's hard to locate threads with updates since you last visited, and it doesn't support mobile devices, which is pretty crucial these days.
Don't worry about having to "retrain" all your members. We already use different forum software on other sites, and given that the software you're migrating to will be easier to use and more familiar (UBB Threads is pretty rare these days, probably because it's so out of date), you're actually reducing the burden on new users, and making it easier for existing ones to use. Your user will actually appreciate the upgrade.
You'll want to shop around, but I'd recommend vBulletin
as one of the best and most popular forum softwares (example
). I've used this on several sites; it has a nice clean look, is quick to load, and has some nice features like auto-subscription to threads you've replied to, then an easily-accessible user control panel to list all the threads with updates.
A quick google reveals that people have been migrating from ubb to vBulletin for over a decade, so it's not like you're treading uncharted ground. vBulletin has something called Impex
that can migrate all your posts and users etc automatically. You can get the free trial and attempt this migration yourself without going live, and see how it works. Or hire some outside help from a site like elance
- the going rate, with a bunch of customization for advertising, seems to be around 1000 USD
. But the new vBulletin 5 drag and drop site builder looks pretty easy to use and since you've already set up this site, I'd guess you're fully capable of customizing it yourself.
Hope this is useful.