There was a precious time then business-to-business (B2B) ecommerce was the sweet darling of Internet-based business. Sure, Amazon.com has a great brand name, but B2B was going to change the very nature of how business would be conducted in the future. Proponents scoffed at consumer e-tailers while pointing to the auto-exchange, Covisint, which is projected to handle some $750 billion in goods annually at some not-to-distant point in the future. And if Covisint saves automakers just 10 percent .