XO Communications Partners With USA.NET to Offer Hosted Microsoft Exchange RESTON, Va. and DENVER, July 12 /PRNewswire/ -- XO Communications, Inc. (OTC:XOCM) (BULLETIN BOARD: XOCM) has entered into a partnership agreement with USA.NET, the nation's leading provider of hosted email services, as its hosted Microsoft Exchange(R) provider. Under the terms of the agreement, USA.NET will also market XO's Concentric(R) Clustered Hosting solution to its customers. The agreement gives XO Communications the ability to offer USA.NET's highly regarded hosted Microsoft Exchange services and enhanced solutions to XO's customers. In addition, nearly all of XO Communications' existing Exchange users have been successfully migrated from the company's previous hosted Microsoft Exchange provider to USA.NET. "In a very short time, USA.NET's platform and professional service team has exceeded our expectations in terms of responsiveness, expertise and customer service," said Barbara Branaman, vice president and general manager of hosting at XO Communications. "We're confident our customers will enjoy a similar experience with all of their Microsoft Exchange needs." USA.NET is the nation's only hosted email provider that is SAS 70-Type II certified, Microsoft Gold Certified, and a member of the Microsoft Technology Adoption Program. About XO Communications XO Communications is a leading provider of national and local telecommunications services to businesses, large enterprises and telecommunications companies. 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, national facilities-based IP network and serves more than 70 metropolitan markets across the United States. For more information, visit http://www.xo.com/. About USA.NET USA.NET, the global eMessaging service provider(TM), is the largest exclusively-focused hosted eMessaging provider in North America, with over 5,000 customers of all sizes and complexities. USA.NET is the only hosting provider who is SAS 70-Type II certified, Microsoft Gold Certified, and a member of the Microsoft Technology Adoption Program. USA.NET eMessaging solutions are modular and infinitely scalable to ensure customers can grow their business without having to invest additional resources, time or capital into their mission-critical messaging infrastructure. More information can be found at http://www.usa.net/ or by calling (303) 865-1200. DATASOURCE: USA.NET CONTACT: Bill McCue of USA.NET, +1-609-397-4880, ext. 217, ; or Chad Couser of XO Communications, +1-703-547-2746, Web site: http://www.usa.net/ http://www.xo.com/

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