Based on the initial response I got from my library's help desk, the person who responded has no idea what a Sony reader is or how it is supposed to work. I will attempt an explanation, and suggest they ask Overdrive (surely they have a contact there for technical questions?) if Sony readers will officially no longer be supported.
However, at this point I am not hopeful that I will receive a useful response.
In case any of you want to try emailing your own library in the hope of reaching someone more knowledgeable, the following is a link to an Overdrive page where you can enter your library's name or location to obtain an email address for you local library:
http://help.overdrive.com/customer/p...ticles/1613698