Quote:
Originally Posted by MRM66
After all your helpful replies I got rid of all my mobis and upgrded Calibre
Something I have been nervous about for ages.
Really pleased.
But I keep thinking should I get rid of any of these also...
AZW3 2685
ORIG AZW3 13
ORIG EPUB 1524
ORIG MOBI 73
PDF 14
Or leave well alone?
And if so, which ones do I really not want?
What do I type in to find them?
Is it the same as removing the Epub?
I value this forums help. 
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As you keep coming back to this I suspect you really do want to get rid of at least some of them.
I would delete the ORIG formats. The easiest way to do that is:
- Make a backup of your library in case something goes wrong.
- Open the "Formats" section of the tag browser (the pane on the left).

- Click the ORIG format you want to remove. A green plus sign will appear and all books having that format will be listed in the book list.

- Press CTRL-A to select all the books.
- Right click on the ORIG format and select "Remove ORIG ...". In this example it is "Remove the ORIGINAL_EPUB" from selected books".

- Answer the "Are you sure" question.

- The format is deleted.

Note: while preparing this post I found a bug in the current calibre version where the tag browser formats list isn't cleaned up after deleting formats. I submitted a fix to Kovid for the next release. In the meantime you can "force" a cleanup by typing E (for edit metadata) then immediately pressing OK.
EDIT: The fix is now in calibre source and will be in the next release/preview.