> I always got the message that the folder "2009" is
> empty. (Which isn't true. It contains the subfolders
> I mentioned above.)

Most web site don't allow you to read folders. If your put the url in your
browser do you see a directory listing? Yes, then httrack can mirror it. 

No, you can't. You'll have to get the url list another way like mirroring the
site.