Hi!
I had to make a clean install of Windows on my computer. Beforehand I exported my Calibre library like it showed. Now I imported it, it went to the folder I specified, but it didn't change anything in Calibre itself. As such, I added the content of that folder to Calibre myself and the books added fine...but with all the metadata that I had created (collections and all). I see a file named metadata in that folder but it's like calibre isn't using it or syncing with it. I don't know. I'm really discouraged thinking that I did all that for nothing and that I lost everything anyway...
Marie