The format that gets me is PDF (Personal Document Format) which was never intended as an ebook format. It's supposed to be solely for sending Documents through email like in the case of you working for a company in California that has an office in New York for example (or vice versa). That way the documents get to the other office quickly with no loss of any of the data. Some PDF files read well enough on Kindle but others are a real burden to read, so I usually use pdf converter or Calibre to convert them if I want them on my Kindle reader or Tablet (i.e. Kindle Fire).
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