Hmmm. Nevertheless the files have gone and I've never even looked at the Calibre directories before today. As to working out a way of deleting only mobi files, I wouldn't have a clue, much less a reason to try.
When you say change the metadata, would that include my habit of reversing first/second names in the author name slot as well as sort order after import?
Don't get me wrong, I love Calibre but the fact is that I've only ever used as a simple consumer so I don't think I've done anything clever or even unusual.
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