NEW YORK — Media Metrix (NASDAQ: JMXI), the pioneer and leader in Internet and Digital Media measurement worldwide, today reports that usage of the Napster software application increased from 1.1 million users in February 2000 to 6.7 million users in August 2000, a 506.8 percent increase. Further highlights on Napster, the controversial music file-swapping service, include:

Napster remains the fastest growing home software application ever.

Napster software-application usage grew more than 30 percent from July to August 2000, both at home and at work, to 6.7 million and 1.2 million unique users, respectively.

Penetration of the Napster software application increased significantly among online-computer users at home: 8.5 percent used the Napster application in August 2000, up from 1.4 percent in February 2000.

Media Metrix SoftUsage Report

Unique Users (000) at Home in the U.S.

January-August 2000

January February March April

Total Online Computer Users 78,248 77,741 76,639 78,266

Multimedia Player Users 31,304 36,005 32,828 34,529

Napster Software-Application Users (1) 1,109 1,744 2,897

May June July August

Total Online Computer Users 77,759 77,591 79,163 79,461

Multimedia Player Users 35,354 35,664 37,477 38,121

Napster Software-Application users 3,166 4,670 4,936 6,729

Media Metrix SoftUsage Report

Unique Users (000) at Work in the U.S.

January - August 2000

January February March April

Total Online Computer Users 24,020 24,759 25,454 26,266

Multimedia Player Users 11,606 13,235 12,736 11,442

Napster Software-Application Users (2) (2) (2) (2)

May June July August

Total Online Computer Users 26,687 26,857 26,863 26,821

Multimedia Player Users 11,455 10,646 14,211 14,523

Napster Software-Application Users 417 763 887 1,179

Media Metrix Definitions

Unique Users: The estimated number of total users who used the software application once in the given month. All Unique Users are unduplicated (only counted once).

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Multimedia applications: Includes such applications as Realplayer, Media Player, Quicktime and Spinner. (1) Indicates unreported traffic. (2) Indicates unreportable traffic.

About Media Metrix

Media Metrix, a Jupiter Media Metrix Company, is the leader and pioneer in Internet and Digital Media measurement and the industry's source for the most comprehensive, reliable, and timely audience, e-commerce and technology measurement services. The Company provides the most comprehensive coverage of all Digital Media including more than 25,000 Web sites and online properties. Media Metrix utilizes its patented operating-system metering methodology to track Internet and Digital Media audience usage behavior in real-time - click-by-click, page-by-page, minute-by-minute. Today, Media Metrix has a representative sample of more than 100,000 people under measurement and covers more than 85% of Internet usage worldwide. Visit us at www.mediametrix.com for more information. About Jupiter Media Metrix

Jupiter Media Metrix is the global leader in market intelligence for the new economy. The Company delivers innovative and comprehensive Internet measurement, analysis, intelligence and events to provide businesses with unmatched global resources for understanding and profiting from the Internet. Jupiter Media Metrix brings together world-class, innovative and market-leading products, services, research methodologies and people. Jupiter Media Metrix brands include Media Metrix, AdRelevance, Jupiter Research and Jupiter Events. The Company is headquartered in New York City and operates worldwide, across the Americas, Asia Pacific, Europe (as Jupiter MMXI Europe), and the Middle East. Visit us at www.jmm.com for more information.

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