Microsoft and AT&T Wireless to Demonstrate New Location-Based Services Product at DEMOmobile 2002

LA JOLLA, Calif., Sept. 18, 2002 — Microsoft Corp. (Nasdaq
) and AT & T Wireless (NYSE
“AWE” ) demonstrated new location-based software, provisionally named Microsoft® Enterprise Location Server, that brings together XML Web services, core Microsoft .NET technology and AT & T Wireless Network to enable rich location-based services. The Microsoft Enterprise Location Server was developed as a part of the strategic alliance formed by the two companies in July. The two companies will demonstrate an application of the software at DEMOmobile 2002 being held at the Hilton La Jolla Torrey Pines in La Jolla, Sept. 19–20, 2002.

The application is built on the .NET Compact Framework on a Windows® Powered Pocket PC-based phone and uses XML Web services to integrate with the Microsoft Enterprise Location Server and AT & T Wireless unique location capabilities to bring together MapPoint® .NET information and real-time location data from AT & T Wireless. It combines the ability to locate colleagues with other functionality, such as the ability to obtain maps and driving directions, conduct proximity searches, and find destinations or points of interest, such as store or customer locations near ones own or a colleagues position, boosting mobile worker connectivity and efficiency and enabling a range of powerful new scenarios in areas such as field sales and service.

“The Microsoft Enterprise Location Server is a significant example of the powerful possibilities that emerge when great software and great carriers come together,”
said Tom Button, vice president of the Developer and Platform Evangelism Division at Microsoft.
“Mobile workers, their companies and application developers are quickly discovering that XML Web services, smart devices, high-speed wireless networks and Microsoft .NET technologies such as the .NET Compact Framework and MapPoint .NET are powerful building blocks on which to deliver valuable mobile solutions and increased return on investment.”

As evidenced today, were delivering on the commitment we announced a few months ago,
“said Don Boerema, senior vice president of Mobile Multimedia Services at AT & T Wireless.”
Together, AT & T Wireless and Microsoft will deliver a new class of business applications designed to enhance the productivity of todays mobile work force. As the only major carrier in North America with a commercially available location-based service platform, weve been able to leverage the capabilities of our next-generation network and Microsofts applications to bring services to market quickly and efficiently.

Pricing and availability for the Microsoft Enterprise Location Server will be announced later.

New Dawn for Mobile Computing

Microsoft .NET is enabling the world of XML Web services for telecommunications companies, enterprises and mobile workers. As an example, the Microsoft Enterprise Location Server marks the first time that enterprise location-based applications are using XML Web services to integrate corporate location data with live location information on mobile devices. This represents a new level of innovation that leads to new, exciting experiences for end users and streamlined operations for enterprise IT departments.

About the .NET Compact Framework and MapPoint .NET

The .NET Compact Framework is Microsofts developer platform for building smart mobile applications that consume XML Web services. The .NET Compact Framework is tightly integrated with Visual Studio® .NET, Microsofts flagship programming tool, meaning that developers have a consistent platform and interface for developing applications that range from the largest servers to the smallest devices. MapPoint .NET is the Microsoft platform for mobile location-based services that enables developers to integrate location intelligence and mapping capabilities into consumer and enterprise mobile applications.

About AT & T Wireless

AT & T Wireless (NYSE: AWE) is the largest independently traded wireless carrier in the United States, following our split from AT & T on July 9, 2001. We operate one of the largest digital wireless networks in North America. With more than 19.95 million subscribers, and full-year 2001 revenues exceeding $13.6 billion, AT & T Wireless is committed to being among the first to deliver the next generation of wireless products and services. Today, we offer customers high-quality mobile wireless communications services, voice or data, to businesses or consumers, in the United States and internationally. AT & T Wireless Customer Advantage is our commitment to ensure that customers have the right equipment, the right calling plan, and the right customer services options — today and tomorrow. For more information, please visit us at .

About Microsoft

Founded in 1975, Microsoft (Nasdaq
) is the worldwide leader in software, services and Internet technologies for personal and business computing. The company offers a wide range of products and services designed to empower people through great software — any time, any place and on any device.

This press release contains

forward-looking statements

that are based on managements beliefs as well as on a number of assumptions concerning future events made by management with information that is currently available to management. Forward-looking statements include, without limitation, managements expectations regarding: our future financial and operating performance and financial condition, including specific projections and guidance for fiscal year 2002; subscriber growth; industry conditions; the strength of our balance sheet; and our liquidity and needs for additional financing.

Readers are cautioned not to put undue reliance on such forward-looking statements, which are not a guarantee of performance and are subject to a number of uncertainties and other factors, many of which are outside AT & T Wireless control, that could cause actual results to differ materially from such statements. Without limitation these factors include: the risks associated with the implementation of a third-generation network and business technology, and the effects of vigorous competition in the markets in which we operate.

For a more detailed description of the factors that could cause such a difference, please see AT & T Wireless filings with the Securities and Exchange Commission, including the information under the heading

Risk Factors

and & quot;Special Note Regarding Forward Looking Statements

in its annual report of Form 10-K filed on March 28, 2002. AT & T Wireless disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Microsoft, Windows, MapPoint and Visual Studio are either registered trademarks or trademarks of Microsoft Corp. in the United States and/or other countries.

The names of actual companies and products mentioned herein may be the trademarks of their respective owners.

For more information on the .NET Compact Framework:

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