Our company is developing our own custom shopping cart. We are only in the initial planning stages and a debate arose in a meeting as to whether we should make our customers register when placing an order.

One side believes that if you are forced to register when completing the order, the customer will just leave the site.

Another side believes that using the customer's email address and password can provide the customer with order confirmation information and order tracking when they return to the site.

What are some of the other pros and cons to having User Registration be part of the order process? What is the general consensus in webproworld.com-land?