It can only go back to 2007
That's because the forum only started in 2007, May 2007 from memory.
With this new setup, you can only go back to 2010, unless you go into your user cp and search your own posts, which in my case is 20th May 2007, which was I think my second or 3rd post, my first post was 18th or 19th of May(in indroductions) didn't come up, which is odd.
Baz.