I use Calibre primarily to...hmm, preserve my ownership of the books I have given money to Amazon for (if, for example, Amazon should decide to pull another 198

I use Calibre primarily to...hmm, preserve my ownership of the books I have given money to Amazon for (if, for example, Amazon should decide to pull another 1984.) I certainly don't need Calibre to use my Kindle, but I'm glad I have it.