merging old forum with new one.
 

Anyone got any pointers on merging another forum with a current one. When i switched to vbb I could never get my snits db to impex in. I found out not i should snits to phpbb to vbb to get it to import. So some of the old users have reregistered etc. Not very many, lots just moved on. But i have3-4 years of very active posting, and lots of content, my board honesty fizzled after switching from snits to vbb. Kinda would not mind having the extra content to help with serps.

What problems will i run into with double user and email addys. I may have 20-30 of these at most.