Media Advisory: Microsoft Bids on Yahoo!

RESTON, VA, February 5, 2008 – Comscore, Inc. (NASDAQ: SCOR), a leader in measuring the digital world, today released figures in support of the continuing coverage of Microsoft’s recent announcement to bid on Yahoo!, relevant Comscore figures are provided below.

• Google Sites saw nearly 588 million visitors worldwide in December 2007, more than both Microsoft Sites and Yahoo! Sites individually, but less than the combined audience of Microsoft and Yahoo!, which would reach 665 million worldwide visitors.
• In search share, Google Sites lead both the U.S. (58.4 percent share), and worldwide (62.4 percent share). Microsoft/Yahoo! combined would have a 32.7 percent U.S. search share, and a 15.7 percent share worldwide.
• In the email category, Yahoo! mail leads both in the U.S. (82 million visitors) and worldwide (257 million visitors). A Microsoft/Yahoo! combined instant messenger audience of 298 million would reach nearly 77 percent of the instant messenger audience worldwide.

*Based on the five major search engines including partner searches and cross-channel searches. Searches for mapping, local directory, and user-generated video sites that are not on the core domain of the five search engines are not included in the core search numbers.

**Based on the top 50 properties worldwide. Worldwide data reported for people age 15+ at world home/work locations

*Worldwide data reported for people age 15+ at world home/work locations

*Worldwide data reported for people age 15+ at world home/work locations

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About Comscore
Comscore, Inc. (NASDAQ: SCOR) is a global leader in measuring the digital world. For more information, please visit www.comscore.com/boilerplate

Press
Bill Daddi
Daddi Brand Communications
646-370-1341
press@comscore.com