Dialink Selects XO Communications to Provide Ethernet,
DIA and VoIP Services

Addition of Ethernet Over Copper and Ethernet Over DS1 Services Will Allow Dialink to Offer Customers Next-Generation Voice and Data Solutions

HERNDON, VA – June 07, 2010 – XO Communications (OTCBB: XOHO) today announced that it has been selected by Dialink, a leading provider of VoIP network services to small and medium-sized businesses in Northern California, to provide Ethernet, DIA and VoIP services. By expanding its voice and IP services with XO, the company is well positioned to offer customers more scalable, cost-effective services, as well as grow its network footprint into the Southern California market.

Dialink approached XO at a time when Dialink’s traditional T1 customers were searching for a more economical IP service that could easily expand as their business needs grew. XO’s Ethernet over copper (EoC) and Ethernet over DS1 (EoDS1) services, with bandwidth options ranging from 3 Mbps up to 10 Gbps, offer the bandwidth flexibility and network reach Dialink requires. With XO’s VoIP origination and termination services added to the mix, the company will be able to offer end-to-end data and voice services.

“Working with XO, Dialink has a competitive advantage as we can now offer new and existing customers the comprehensive and cost-effective service solutions their evolving businesses require,” said Jeff Klapper, president of Dialink. “We look forward to growing our business with a company who shares our goal to provide the highest-level customer support and superior network services.”

XO’s extensive Ethernet infrastructure – which reaches nearly four million buildings nationwide – further affords Dialink the opportunity to move forward with plans to expand its network into Southern California.

“XO continues to invest in its IP and Ethernet infrastructures so we can quickly and effectively provide carriers of all sizes and their customers with customized Ethernet solutions that best meet their needs – whether its new customer demands or business expansion plans,” said Ernie Ortega, president of XO Carrier Services. “The solution we designed for Dialink brought significant value to their business by concurrently improving their service offerings and achieving significant cost savings.”

About XO Communications

XO Communications, a subsidiary of XO Holdings, Inc. (OTCBB: XOHO), is a leading nationwide provider of advanced communications services and solutions for businesses, enterprises, government, carriers and service providers. Its customers include more than half of the Fortune 500, in addition to leading cable companies, carriers, content providers and mobile network operators. Utilizing its unique combination of high-capacity nationwide and metro networks and broadband wireless capabilities, XO offers customers a broad range of managed voice, data and IP services with proven performance, scalability and value in more than 75 metropolitan markets across the United States. For more information, visit www.xo.com.

About Dialink

Dialink is a leading provider of voice, data/IP and VoIP services to small- and medium-sized businesses throughout California. With more than 20 years of experience, Dialink is one of the country’s first integrated service providers with capabilities ranging from network services to customer premise equipment. The company prides itself on offering cost-effective solutions and personalized customer service to best meet the business-critical communications needs of its customers. For more information, visit www.dialink.com.

Cautionary Language Concerning Forward-Looking Statements

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) that involve risks and uncertainties. These statements include those describing our ability to expand (internationally and domestically) and broaden our offerings. Management cautions the reader that these forward-looking statements are only predictions and are subject to a number of both known and unknown risks and uncertainties, and actual results, performance, and/or achievements of XO Communications may differ materially from the future results, performance, and/or achievements expressed or implied by these forward-looking statements as a result of a number of factors. Other factors to consider also include the risk factors described from time to time in the reports filed by XO Holdings, Inc. with the Securities and Exchange Commission, including its Annual Report on Form 10-K for the year ended December 31, 2008 and its quarterly reports on Form 10-Q. XO Holdings, Inc. undertakes no obligation to update any forward-looking statements, except as otherwise required by law.

Media Contacts

Monica Heckman
Reputation Partners (for XO Communications)
(312) 819-5720

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