| | Arcelor Mittal signs Agreement to develop iron ore mining in Senegal                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
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| | Rotterdam/Luxembourg, February 23, 2007Arcelor Mittal, the worlds largest and most global steel company, today announces that it has signed various Agreements with the State of Senegal in West Africa to develop iron ore mining in the Faleme region of South East Senegal.
      
      The project is expected to entail an investment of approximately $ 2.2 billion. The total estimated reserves are approximately 750m tonnes, located in 4 locations in the Faleme region and comprising both haemetite and magnetite deposits.
      
      The project is an integrated mining project and will encompass the development of the mine, the building of a new port near Dakar and the development of approximately 750 km of rail infrastructure to link the mine with the port.
      
      The mine is expected to commence production in 2011. The project will be developed in phases to achieve an annual production capacity of between 15 million 25 million tonnes per year at peak operations. The Company will also consider selective investments in the downstream steel facilities.
      
      The agreements will become effective upon fulfillment of certain conditions precedent by the State of Senegal.
      
      The Company has also pledged its support to the community and the people of Senegal as part of its commitment to Corporate Social Responsibility in the countries in which it operates.
      
      Commenting, Mr.Lakshmi N. Mittal, President and CEO, Arcelor Mittal said:
      
      We are delighted at having signed the binding agreements with the State of Senegal in Dakar yesterday and are now looking forward to moving forward with this important project. Once completed, the Faleme project will prove to be an important and competitive source of iron ore supplies for our European plants
      
    This project is an important step in our strategy of creating West Africa as a mining hub for iron ore supplies to our steel plants around the world. We are confident Senegal will prove to be a strategic location to extend our existing footprint in the promising West African markets.



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|                                                                                                    | About Arcelor Mittal
      Arcelor Mittal is the world's number one steel company, with 330,000 employees in more than 60 countries. The company brings together the world's number one and number two steel companies, Arcelor and Mittal Steel.
      Arcelor Mittal is the leader in all major global markets, including automotive, construction, household appliances and packaging, with leading R&D and technology, as well as sizeable captive supplies of raw materials and outstanding distribution networks. An industrial presence in 27 European, Asian, African and American countries exposes the company to all the key steel markets, from emerging to mature, positions it will be looking to develop in the high-growth Chinese and Indian markets.
      Arcelor Mittal key pro forma financials for the first nine months of 2006 show combined revenues of USD 65.4 billions, with approximate production capacity of 130 million tonnes a year, representing around 10 per cent of world steel output.
      Arcelor Mittal is currently listed under the legal entity Mittal Steel NV on the stock exchanges of New York (MT), Amsterdam (MT), Paris (MTP), Brussels (MTBL), Luxembourg (MT) and on the Spanish stock exchanges of Barcelona, Bilbao, Madrid (MTS) and Valencia.
      Forward-Looking Statements
      
    This document may contain forward-looking information and statements about Mittal Steel Company N.V. including Arcelor S.A. These statements include financial projections and estimates and their underlying assumptions, statements regarding plans, objectives and expectations with respect to future operations, products and services, and statements regarding future performance. Forward-looking statements may be identified by the words believe, expect, anticipate, target or similar expressions. Although Arcelor Mittals management believes that the expectations reflected in such forward-looking statements are reasonable, investors and holders of Mittal Steels securities are cautioned that forward-looking information and statements are subject to numerous risks and uncertainties, many of which are difficult to predict and generally beyond the control of Mittal Steel, that could cause actual results and developments to differ materially and adversely from those expressed in, or implied or projected by, the forward-looking information and statements. These risks and uncertainties include those discussed or identified in the filings with the Netherlands Authority for the Financial Markets and the Securities and Exchange Commission (SEC) made or to be made by Mittal Steel, including (in the latter case) on Form 20-F. Mittal Steel undertakes no obligation to publicly update its forward-looking statements, whether as a result of new information, future events, or otherwise.
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|Contact information Arcelor Mittal Investor Relations                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
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|UK/Asia/Africa                                                                                      | +44 207 543 1172                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
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|Contact information Arcelor Mittal CommunicationsE-mail:press@arcelormittal.comPhone:+352 4792 5000
|Arcelor Mittal Corporate Communications                                                             | France                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
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|Luc Scheer                                                                                          | +352 4792 2360                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
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|Philip Gawith / Lydia Pretzlik                                                                      | +44 20 7379 5151                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
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