XO had deployed IP/MPLS in its core back when the carrier got its start in the business. In March 2007, it finally introduced a customer-facing MPLS-based IP VPN service. XO now has to make up a great deal of lost ground in network-hosted VPNs. This report contains insight and analysis of the product or service strengths and weaknesses, list of buying criteria and how the product or service fares in each category, and a comprehensive table of product or service metrics and specifications. This report is useful for purchasers who need to evaluate products, or as a source of competitive intelligence for vendors.