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(Official Form 1) (9/01) FORM B1

United States Bankruptcy Court Southern District of New York

Voluntary Petition

Name of Debtor (if individual, enter Last, First, Middle):

WorldCom, Inc.

Name of Joint Debtor (Spouse) (Last, First, Middle):

All Other Names used by the Debtor in the last 6 years

(include married, maiden, and trade names): MCI WORLDCOM, Inc., LDDS WorldCom

All Other Names used by the Joint Debtor in the last 6 years

(include married, maiden, and trade names):

Soc. Sec./Tax I.D. No. (if more than one, state all):

58-1521612

Soc. Sec./Tax I.D. No. (if more than one, state all):

Street Address of Debtor (No. & Street, City, State & Zip Code):

500 Clinton Center Drive Clinton, Mississippi 39056

Street Address of Joint Debtor (No. & Street, City, State & Zip Code):

County of Residence or of the Principal Place of Business:

Hinds County, Clinton, Mississippi Mailing Address of Debtor (if different from street address):

County of Residence or of the Principal Place of Business: Mailing Address of Joint Debtor (if different from street address):

Location of Principal Assets of Business Debtor (if different from street address above): The Debtor and its affiliates own and operate a global telecommunications network with substantial assets throughout North America, Europe, the Middle East, Africa, Latin America, Australia, and Asia.

Information Regarding the Debtor (Check the Applicable Boxes)

Venue (Check any applicable box) Debtor has been domiciled or has had a residence, principal place of business, or principal assets in this District for 180 days immediately preceding the date of this petition or for a longer part of such 180 days than in any other District. There is a bankruptcy case concerning debtor’s affiliate, general partner, or partnership pending in this District. Type of Debtor (Check all boxes that apply) Individual(s) Corporation Partnership Other Railroad Stockbroker Commodity Broker Nature of...