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High Quality Content by WIKIPEDIA articles! XO Communications (previously Nextlink Communications, Concentric Network Corporation and Allegiance Telecom, Inc.) is a one of the largest telecommunications companies in the United States. It is owned by XO Holdings, Inc OTCBB: XOHO. XO provides voice, data and IP services to small and medium-sized business, large enterprises, cable companies, content providers, telecommunications companies and wireless service providers in more than 75 major metropolitan markets across the United States. Its customers include more than half of the Fortune 500.

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High Quality Content by WIKIPEDIA articles! XO Communications (previously Nextlink Communications, Concentric Network Corporation and Allegiance Telecom, Inc.) is a one of the largest telecommunications companies in the United States. It is owned by XO Holdings, Inc OTCBB: XOHO. XO provides voice, data and IP services to small and medium-sized business, large enterprises, cable companies, content providers, telecommunications companies and wireless service providers in more than 75 major metropolitan markets across the United States. Its customers include more than half of the Fortune 500.