Kathy, do I really need to give you the answer?
Ruddy apple, iplod and itunes and single format unusable crap?
Yebbut the iBook was FREE!
And therein lies my gripe with DRM...
You have bought (for free) the book for your iPhone Kindle App, but can't read it on the Kindle, therefore have to download it again (at cost 'cos I can't find it for free) for the Kindle itself.
That's like having to buy the same physical book twice, once for home and once for holiday.
I would never have bought a Kindle, as I felt it was tied to Amazon in the same way that iShit is tied to Apple.
Mine was bought for me though as a present so I pretend to be grateful. Calibre is good (but I don't have that book in the library to give you to replace the one you have bought already). Question I still wonder though, can Amazon read what I have on my kindle that I have downloaded from Gutenburg etc?