XO Communications Teams With Ziff Davis Offering an Online Seminar On the Cost Saving Benefits of Outsourcing to a Web Hosting Provider

The seminar will feature:

-- Michael Krieger, Vice President of Ziff Davis will provide an overview on
general marketplace conditions, including an analysis on the state of the
hosting industry, and how this factors into the consideration process when
selecting a hosting provider.

-- Nancy Gofus and James Isaacs, Vice President of Product Management and
Hosting Application Services for XO will present the business case for
outsourcing, including ROI modeling, resource gains and the technical
advantages achieved in terms of superior security, performance and reliability.


-- Sean Moriarity, Executive Vice President of Technology for TicketMaster will
provide key insight from the customer perspective, including why XO was chosen
as TicketMaster's hosting partner, the decision factors used in their selection
process and the service benefit gained throughout the 2  year partnership.

-- Sameer Padhye, Vice President of Service Provider Marketing for Cisco
Systems will cover the ten key questions to ask when considering a Web hosting
provider.

"In our interactions with customers we've found they outsource for several core reasons," said James Isaacs. "The first reason is customers can save money by lowering overall costs. Secondly, customers can achieve greater reliability by leveraging a hosting provider's data center infrastructure and achieve higher levels of functionality or capability. Finally, companies can convert capital expense into a variable operation expense, enabling them to conserve their capital for their main business."

XO Web Hosting Services

XO offers an extensive array of hosting services for small- and medium-sized businesses to larger enterprises and Internet-centric companies.

Offering the industry's most comprehensive customer migration path, XO can deliver solutions ranging from shared hosting service, that allows multiple customers to leverage a cluster of servers for superior uptime and reliability, up to a managed or co-location hosting service for customers that require dedicated servers and high-performance Web, transaction and application hosting.

In the United States, XO hosting services are deployed and managed from five XO data centers located in Irvine, San Jose, Chicago, Secaucus, New Jersey and Fremont, California. All XO data centers are connected to the Company's broadband network backbone, which provides for faster content delivery (low latency) and increased reliability (high throughput) of customer traffic.

XO Communications is one of the world's leading providers of broadband communications services offering a complete set of communications services, including: local and long distance voice, Internet access, Virtual Private Networking (VPN), Ethernet, Wavelength, Hosting and Integrated voice and data services.

XO has assembled an unrivaled set of facilities-based broadband networks and Tier One Internet peering relationships in the United States. XO currently offers facilities-based broadband communications services in 62 markets throughout the United States.

The Company is also one of North America's largest holders of fixed broadband wireless spectrum, with licenses covering 95 percent of the population of the 30 largest U.S. cities.

The statements contained in this release that are not historical facts are "forward-looking statements" (as such term is defined in the Private Securities Litigation Reform Act of 1995). These statements include those describing the expected future operations of XO and the potential benefits of the arrangements and services described in this release. Management wishes to caution the reader that these forward-looking statements are only predictions and are subject to risks and uncertainties and actual results may differ materially from those indicated in the forward-looking statements as a result of a number of factors. These factors include, but are not limited to, those risks and uncertainties described from time to time in the reports filed by XO Communications with the Securities and Exchange Commission, including its Annual Report on Form 10-K for the year ended December 31, 2000 and in it's Quarterly Report on Form 10-Q for the quarter ended June 30, 2001. XO, XO Not Just Talk and the XO design logo are trademarks of XO Communications, Inc. Other product or service names mentioned herein are the trademarks of their respective owners.