Space bar goes to the next message for my thunderbird install on windows

Jon Daley wrote: 
On Thu, 20 Apr 2006 13:28:50 -0500, Charles McNulty <charles@charlesmcnulty.com> wrote:
  
The space key doesn't navigate to the next message on my install
of Thunderbird or Outlook or any other mail application that I've ever
heard of.
    

I wasn't one of the people who mentioned it, but space skips to the next unread message (even not in the current folder) on Pine, my normal mail client.