An e-book's container format is (essentially) orthogonal to whether or not it has DRM. Kindle uses a convoluted, badly designed container, where everyone else

An e-book's container format is (essentially) orthogonal to whether or not it has DRM. Kindle uses a convoluted, badly designed container, where everyone else uses ePub, which is an open standard. Bottom line: There is not Kindle support because Kindle is too picky.