How To Recover Registered Email Address?

Hi,

After the system drive in my father-in-law's WHSv1 failed, I reinstalled his home server with a new system drive and WHS2011. When trying to re-register remote access, my father-in-law cannot remember the email address he used to register his WHSv1. Without it, he will lose his subdomain.

I was able to boot the original faulted drive in another PC, but cannot seem the find the registration information anywhere in the dashboard or strings in the registry.

Does anyone know how I can recover this information?

Thanks!