MC SHOWCASE BUYER'S GUIDE

XO Communications, a subsidiary of XO Holdings, Inc. (OTC Bulletin Board: XOHO.OB), is a leading provider of national and local telecommunications services to businesses, large enterprises and communications service providers. XO offers a complete portfolio of services, including local and long distance voice, dedicated Internet access, private networking, data transport, and Web hosting services as well as bundled voice and Internet solutions. XO provides these services over an advanced, nationwide facilities-based IP network and serves 75 metropolitan markets across the United States. For more information, visit http://www.xo.com. XO Communications