Access to e-reader books

A couple of years ago I bought a Sony e-reader which uses Adobe digital editions.  Recently my desktop computer died and I bought a laptop.  I then set up a new email account and a new adobe account, not realizing the consequences.  Now I can only read content on my e-reader that has been authorized with my new adobe account.  When I try to open any older purchases I get an error message “Protected by Digital Rights Management”

How can I transfer all or some of the previous purchases to my new adobe account?  I still have a lot of unread books!

Cheers

Kate