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AFAIK original_mobi is never replaced. You cannot convert to that format. The original mobi file can be replaced
You can choose mobi as your preferred input for conversions and delete saved conversion settings when bulk converting. Then calibre will always choose mobi as its input source, unless an original_mobi file exists. If file does not exist it will then create one.
Of course you may be using an older version of the software or have the tweak turned of, in which case I am probably confusing you.
But I assure you it does work.
Helen
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