Well, the integration isnt a listed feature as such. When I was comparing eSupport and ProSupport I submitted a ticket to the ProSupport team asking if vBulletin integration is possible. They replied saying that it could be done by editing the userlogin.class file.
However it isnt as straight forward or intuitive as I thought it would be... I have looked at other scripts (mainly vbulletin integration scripts from vb.org), just to see how they integrate and I can see it isnt anywhere near as simple as I had thought.
Any pointers would be well recieved,
thanks