Well calibre does a good job if there is no DRM. If you have books withe that dreaded readers bloc, you would need to remove the DRM before conversion.
Otherwise, most book formats are readable by various apps. iBooks would read drm free pubs and PDFs, kindle app will obviously read kindle books and I think it can read mobi, but I haven't got round to investigating that yet.
Stanza and others also exist, include bluefire which are all worth trying. So you may not need to convert in all instances.
Howard
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