If you mean azw3/KF8, I would suggest trying the KindleUnpack plugin instead of calibre's built in coversion to extract an ePub from an azw3 since the structure and CSS will be much closer to the azw3's structure (and much like the structure of the ePub used as input to Kindle Publishing). If you mean azw (mobi with DRM), then calibre' conversion is pretty much the only game in town.
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