Will I be able to change my customer’s email address? Will he now able to view the old invoices in the customer portal?

Will I be able to change my customer’s email address? Will he now able to view the old invoices in the customer portal?

Yes, you can change the email address of a customer. Send him a portal invitation again using the new mail ID, using which he can create a password and log back into the portal. Once this is done, he can view all old invoices you’ve sent him