After some stressful and unsatisfying days the upgrade to the new site and forum went pretty well. All posts could be save, all users with that have previously posted are able to login again.
When you tried to register before and wasnt enabled by an admin please register again.
This board has a lot of new features. And it will take care of those spam-bots too.
Some minor changes (like theme setting and the like) will happen in the near future, but the basic function is back in place. So have fun looking around and enjoy