You'll need ADE if you are downloading books with DRM. You can use ADE for non DRM books but just about everybody prefers Calibre for their non-DRM books (out of copyright books like the ones on this site). Calibre also has a lot of other good features, like conversion of books to EPUB format, downloading magazines and news feeds (you'll really enjoy this once you get used to it!) and is just much more user friendly. I open Calibre every day and ADE only when I buy a new DRM'd book - and I would guess a lot of ebook owners would say the same!
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