Epub is not an Adobe format at all. It's an extension of the open ebook format. Amazon purchased the Mobi format a while ago and used that as the basis for the Kindle format. Whether Amazon charge others to use their format or not, I dunno.
Oh, ok, fair enough. I thought that since Adobe have digital editions, it was a Adobe format. Even better news.
My Kobo touch can read mobi, but I don't think any of their newer readers do.
As someone who has created and edited ebooks in both formats, epub is the easier to work with.
I have no idea, I take your word on that