Stupid idea... Now I have plenty of questionmarks behind the old folders in lightroom. I moved the catalogue too. Most of the pics are connected again, but some folders remain with the pics, but without any metadata-information as out-of-the-cam-version. How do I synchronize with the still existing catalogue-information from the former place? The pics there still have all of my changes, I can open them and see what I did. Thanks!
Right click folders and choose Find Missing Folder, then point to where they now are.
Or put them back as they were before.