Calibre can manage your AZW files "as is" if you want, but these are typically locked to a single device by DRM. A better alternative is to strip the DRM using a 3rd party plugin for Calibre that imports DRM-ridden AZW but instead adds DRM-free MOBI to the Calibre library. That way, you are free to edit metadata and add a new cover etcetera. See Apprentice Alf's Blog for more on DRM.
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