XF 1.2 vbulletin 4.2.2 import

Hey guys I work on a board with 190k posts and we did an import to XenForo 1.2.2 last night and went very well. I have a problem with a mod we have on vBulletin that mentions users. When we converted to xF the mentions came out like:


I was wondering if there was a way I could change them to @ or delete them? Or would it be worth uninstalling the mod before the import?

Another quick question the site uses vb4 friendly urls would I need to put anything in the .htaccess for it to redirct to the correct threads?

Any help would be appriciated!