When I view a thread on my forum it looks like this:

http://lymecommunity.com/forums/ubbthreads.php/ubb/showflat/Number/72/page/1#Post72

But when I email THE SAME THREAD, the link looks like this:

http://lymecommunity.com/forums/ubbthreads.php?ubb=showthreaded&Number=72

What is the difference between these two URLs? Is there anything functionally different about them that I need to understand?