Google is already crawling the site. Some sites have crashed in Google after changing to mod_rewrite using vBSEO, after already being indexed.
Umm lots of sites vbseo and non have crashed in google. There is no way period you can say it was related to VBSEO :thumbdown:
It properly uses 301 redirects. There is NO duplicate content period.
What is it with people and thinking that just because you go mod_rewrite you think google doesn't crawl vBulletin sites? Of COURSE THEY DO. No one is saying they don't. The purpose of Mod_Rewrite is to put keywords in the urls and to clean the urls.