Change mail adress in Adobe-ID? How keep the books?

Hello!

1. I want to change email adress for my Adobe-ID. Can I do that without loosing all the ebooks I've bought with my "old" email adress/adobe-id? (It will still be on the same unit.) 2. After changing email adress, I want to move my ebooks from the Sony ereader app, where they are now, to ADE, and start using that as a library. How do I do it? 3. I guess I have to change adobe-id/email adress on both sony ereader app and ADE (1) before being able to do nr 2?

Thank you!