vBSEO sitemap telling of duplicate content?

Nopes.

But if you don't have any old/stock vBulletin URLs indexed in Google currently,
theres no point in turning it On either.

We installed SiteMaps at least six months ago I think so are we ok to disable those?

Ah... yes. You can disable it, then.

You also need to fix these issues :

- The broken individual post permalink URLs. (!important)
- No use of having 1040 calendar pages indexed. Kinda useless.
- Nearly 500 indexed urls related to /forums/post_thanks.php (majority having dupe meta tags)
- ...

Originally Posted by Shadab

You also need to fix these issues :

- The broken individual post permalink URLs. (!important)
- No use of having 1040 calendar pages indexed. Kinda useless.
- Nearly 500 indexed urls related to /forums/post_thanks.php (majority having dupe meta tags)
- ...

Thanks, but again, I've no idea how to. They're not in the CP as far as I can see.

For the first issue, create a new thread in this sub-forum :
http://www.vbseo.com/f77/

For the 2nd and 3rd issues...

check if you are getting any traffic from SEs on those 2 types of pages (e.g.: in Google Analytics, if you use it)
and then decide if they are worth blocking or not. (via robots.txt)