Quote:
Originally Posted by conan50
Looking at it going in another direction, is there a serious danger that in time there will not be backwards compatibility with older file types? I saw this change from pdb to epub at B&N I think, at least they upgraded the files. But do we have any guarantee that Amazon or anyone else will upgrade older file types in the future?
That is one thing that always appeals about print books, unless physically damaged--they aren't going anywhere 
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Is there a serious danger that calibre will drop off the face of the planet?
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There are several different tools available for converting between formats, I highly doubt that your ebooks of
whatever format are going anywhere.