The reason Amazon is not supporting ePub is because Amazon doesn't have control over the format. Also, with AZW, if people want to buy a DRMed eBook, they have to buy it from Amazon. Also, Amazon eBook experience would not be the same if Amazon allowed ePub with DRM using ADE. Amazon would lose money.
I suspect if Amazon supports ePub for the Harry Potter eBooks, they may do so like they do PDF. Without DRM.
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