Without triggering religious wars, for archival use, I prefer .rtf, or .prc (non-DRM). Both are ubiquitous, fairly neutral, and widely dispersed. That's your best bet for being able to read them years from now. Third choice is probably MS Reader, and strip the DRM so you wind up with a OEB file-set. After that, any other strippable format.
Regards,
Jack Tingle
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