We have an existing VBulletin forum. Right now we just completed our portal using Drupal (V6). We want to use vBulletin login panel and while any user login using that they will automatically login to Drupal site also. I already checked DrupalVB and vbDrupal. But we need vb based login system but vbDrupal latest version is 5x, so it is not our choice. I think i have to create a vBulletin plugin to create drupal login session and save the new user in drupal user table while user login throught dBulletin login panel.

Can anyone help please or suggest any better solution.