Originally Posted by wallcraft
Given that bookmarks and annotations will migrate to a purchased copy of the same ebook, the lending library version must be identical to the Kindle store version (i.e. AZW or TOPAZ, not ePub). So my guess is that OverDrive will give you a ticket that the Kindle Store redeems. That is already the way that Adobe DRM redemption works after all.
Where did it say that if you borrowed a library eBook that the annotations would carry over to a purchased copy?