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ePub (either version 2 or 3) is an opensource format that has a standard ... It is not OS dependent. The same ePub will work on the same app on all operating systems.
We wish all devices/apps/developers/etc would support the ePub standard natively; it would make our lives soooo much better!
Unfortunately, people who work at these different companies (apple/amazon/kobo, etc) think they can do it better, and come up with their own standard/format. Fortunately, most of them have the ability to read a standard ePub (2 or 3) and/or convert it to their proprietary format to be readable on their device/app.
If that doesn't work, then you have 3rd party programs that can convert it - like Calibre - sometimes even doing a better job!
You may want to provide your customers instructions - or links to instructions - to show them how to open an ePub on the different devices.
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