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OK.
I can use mobi and azw on Kindle.
I can use epub on Nook and epub and pdf on iPad (iBooks) and eReader.
I can definitely use pdf on eReader and anywhere else, where I can install pdf reader.
Obviously, html and doc/rtf formats are used too, because I see them sold in the same bundle with mobi and epub all over the place.
A couple of years ago FictionWise was offering 2 to 4 formats. ARe is offering at least 2 different formats, sometimes more. Many book publishers offer html, epub, mobi, pdf and doc.
So, we can talk about file extensions instead of book formats, fine. Sums up to pretty much the same thing: Kobo is very restrictive in what it's offering. I am just curious why, since I am not a bookseller and never really looked into that problem.
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