This solved SO many of my problems
One question about Calibre that is probably NOT Sony-related:
When I started up, I sorted my ebooks manually, I saw no reason to have the books that the reader cannot read in the library. (Yes, I am big on manual labor, I know).
With Calibre, I realize I may just as well include the rest of the formats in the library, just to get it all in one place. (I decided I would have the Calibre-library, and a backup of the Calibre-library (on another disk), and delete the rest of the files.)
So, I imported all the formats I had previously NOT included.
Now, I must merge the "new" books with the "old" ones. More manual labour, I guess, as this should probably NOT be done automatically.
BUT, is there any way to have Calibre display only the books where I have more than one with the same name/author?