Rockwood Holdings, Inc. Adds Hosting and Internet Protocol Telephony to Business with AT&T

Princeton, New Jersey, May 10, 2007

AT&T Inc. (NYSE: T) today announced the signing of contracts for hosting and Internet Protocol Telephony (IPT) with Rockwood Holdings, Inc., a global family of specialty chemicals and advanced materials businesses. The contracts add to the portfolio of telecommunications services that AT&T has provided for Rockwood for the past five years. Specific terms of the new agreements were not disclosed.

AT&T designed hosting and disaster-recovery capabilities to provide Rockwood with more advanced solutions to protect the company's critical business data and applications. These services were previously managed 100 percent in-house by Rockwood. Under the hosting contract, Rockwood will store critical data at one of AT&T's temperature-controlled, secure Internet Data Centers (IDCs), which are monitored around the clock, 365 days a year. AT&T IP-enable Frame Relay and enhanced Virtual Private Network (VPN) services will create a fully meshed network and offer reliable communication between the IDC and Rockwood business locations.

The Internet Protocol Telephony contract will deliver greater flexibility and expanded capabilities, compared with a conventional voice platform. The new IPT system will allow Rockwood to link employees' offices and to integrate voice mail, instant messaging and live phone calls at a lower cost than with traditional telephony.

"We are pleased to expand our business with AT&T," said Mark Yankowskas, Chief Information Officer of Rockwood Holdings, Inc. "For the past five years, AT&T has delivered customized services that have fulfilled our specific needs, as our business has grown and our needs have changed. We recognize the value that AT&T's hosting and advanced telephony capabilities bring to a company of our size and complexity."

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About Rockwood Holdings, Inc.
Rockwood Holdings, Inc. is a leading global specialty chemicals and advanced materials company. Rockwood has a worldwide employee base of approximately 9,500 people and annual net sales of approximately $3.0 billion. The company focuses on global niche segments of the specialty chemicals, pigments and additives and advanced materials markets. For more information on Rockwood, please visit www.rocksp.com.

About AT&T
AT&T Inc. is a premier communications holding company. Its subsidiaries and affiliates, AT&T operating companies, are the providers of AT&T services in the United States and around the world. Among their offerings are the world's most advanced IP-based business communications services and the nation's leading wireless, high speed Internet access and voice services. In domestic markets, AT&T is known for the directory publishing and advertising sales leadership of its Yellow Pages and YELLOWPAGES.COM organizations, and the AT&T brand is licensed to innovators in such fields as communications equipment. As part of its three-screen integration strategy, AT&T is expanding its TV entertainment offerings. Additional information about AT&T Inc. and the products and services provided by AT&T subsidiaries and affiliates is available at www.att.com.

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