My Nook library was not showing books I'd ordered so I contacted their tech department. They said my email had changed but it never has. They had me re-register the device which eliminated all of my books. When I asked them to resend them - they'd sold them to me and of course have the sales records - they said I had to tell them the other email address. But I'd never had a different one. The Nook went into the trash. Never again.