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There is a column called modified but it is affected by other things such as global tag changes.
What worked for me is to have the original format turned on. Then when you convert mobi to mobi the original file extension is renamed to original_mobi.
This file is then used for conversions if you convert again. You can delete it of course, but I don't as calibre also saves the conversion settings. Takes up disk space of course, but I like it.
Helen
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