Quote:
Originally Posted by Sirtel
If they're running 5.0, they're still pretty up-to-date compared to some. I've seen reports about running 3.x and 4.x versions several times, and in one case even 0.x (yes, recently). Granted, that person only used calibre for conversion, not for library management. Their reason for running a stone-age version was that it does what they want and they don't need anything else.
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There's some neat statistics here:
https://calibre-ebook.com/dynamic/calibre-usage