Keynote® Systems (Nasdaq: KEYN), the global leader in on-demand mobile and Internet test & measurement solutions for continuously improving the online experience, today announced that it will demonstrate the world’s most powerful Web load testing product, Keynote LoadPro, used by leading retailers at the upcoming Internet Retailer Conference & Exhibition being held at McCormick Place West in Chicago, IL on June 8 – 11^th. In addition, Keynote will be demonstrating Keynote Test Perspective 3.0 just announced this week, a fully self-service load testing product that is making load testing available, accessible and easy to use for every IT department. Media and analysts are invited to visit Keynote at Booth #149.

“As Americans across the country begin heading off on summer vacations, leading retailers across the nation will begin battening down the hatches to prepare for the 2010 online holiday shopping season,” said Anshu Agarwal, vice president of marketing at Keynote. “The Internet Retailer Conference is the ideal gathering for retailers to see Keynote’s latest and most powerful load testing and Web monitoring solutions in action. We invite our many retail customers, and of course prospects, to stop by our booth during the show.”

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About Keynote

Keynote Systems (NASDAQ: “KEYN”) is the global leader in on-demand test & measurement solutions for continuously improving the online experience. For over a decade, Keynote has been providing measurement data and testing capabilities that allow companies to understand and improve their customers’ online and mobile experience. Keynote has four test and measurement businesses: Web performance, mobile quality, streaming & VoIP and customer experience/UX.

Known as The Mobile and Internet Performance Authority™, Keynote has a market-leading infrastructure of 3,000 measurement computers and mobile devices in over 240 locations around the world. Keynote’s 2,800 customers represent top Internet and mobile companies including American Express, Disney, eBay, E*TRADE, Expedia, Microsoft, SonyEricsson, Sprint, T-Mobile, Verizon, Vodafone and YouTube.

Keynote Systems, Inc. is headquartered in San Mateo, California and can be reached at www.keynote.com or by phone in the U.S. at 1-800-KEYNOTE.

Keynote®, DataPulse®, CustomerScope®, Keynote CE Rankings®, Keynote Customer Experience Rankings®, Perspective®, Keynote Red Alert®, Keynote Traffic Perspective®, Keynote WebEffective®, The Internet Performance Authority®, MyKeynote® , SIGOS®, SITE®, Keynote™, The Mobile & Internet Performance Authority™, Screen Sensing Technology and Keynote FlexUse™ are trademarks or registered trademarks of Keynote Systems, Inc. in the United States and/or other countries. All other trademarks are the property of their respective owners. © 2009 Keynote Systems, Inc.