As part of a current development project for a support desk utilising CRM Portals we had a requirement to allow the system to automatically associate a new B2C login with an existing contact if the email address matches.
I was admittedly worried this could be a difficult thing to do well, however, CRM Portals actually makes it extremely easy providing your email claims are linked to the primary email field in CRM.
In this article, I’ll cover the setting required to make this work.
SharePoint & CRM 