Keynote Systems, Inc. : World's First Global Website Monitoring Service Using Internet Explorer 9 -- Now Available from Keynote

-- Keynote's market-leading Transaction Perspective website monitoring service is world's first solution to measure and monitor site performance from the true end user perspective using Microsoft IE9 browser -- Leading companies rely on Keynote performance monitoring for websites using advanced capabilities like HTML5, CSS3 and DOM performance APIs -- Transaction Perspective uses an actual IE9 browser on Windows 7 to generate measurements from locations all over the world and collect the most precise and accurate end user performance data 24x7

Keynote Systems (Nasdaq:KEYN), the global leader in Internet and mobile cloud testing & monitoring, today announced the world's first website monitoring service to use Microsoft Internet Explorer 9 to measure website performance. IE9 is the most popular desktop Web browser worldwide with 51.9% marketshare.*

Keynote Transaction Perspective®, the market leading website monitoring service, now uses IE9 for measuring website performance from the end user perspective worldwide. Using IE9 underscores Keynote's technology leadership by allowing site operators to accurately capture the detailed effects on performance of websites using modern Web standards such as HTML5, CSS3, and DOM APIs designed for high performance. No other website monitoring company currently offers IE9 browser-based performance measurements in a clean-room testing lab to customers.

"Keynote Transaction Perspective has always delivered the most accurate representation of end user experience by using real IE and Firefox browsers to measure the speed of websites and applications," said Vik Chaudhary, vice president of product management and corporate development at Keynote. "As the first and only Internet cloud monitoring service to harness Internet Explorer 9, Keynote continues to lead the industry in Web performance monitoring by using state-of-the-art Web browsing technologies."

All Keynote customers can preview monitoring using IE9 immediately by applying for the IE9 preview program by contacting their Keynote account representative or submitting a request online from Keynote Support Central.

Follow Keynote on Twitter at: www.twitter.com/KeynoteSystems and www.twitter.com/Keynote_Mobile

*According to Net Applications

About Keynote Systems

Keynote Systems, Inc., (NASDAQ:KEYN) is the global leader in Internet and mobile cloud testing & monitoring. Keynote maintains the world's largest on-demand performance monitoring and testing infrastructure for web and mobile sites comprised of over 4,000 measurement computers and mobile devices in over 275 locations around the world that enable companies to continuously improve the online and mobile experience. Known as 'The Mobile and Internet Performance Authority?, Keynote offers three market-leading product platforms:

Keynote Perspective® provides on-demand performance monitoring for enterprise web and mobile sites including online portals, e-commerce sites and B2B sites. Over 2,000 customers rely on Keynote Perspective services to know precisely how their websites, content, and applications perform on actual browsers, networks, and mobile devices.

Keynote DeviceAnywhere is an enterprise-class, cloud-based, mobile application lifecycle management (ALM) testing & quality assurance platform. It is used by over 1,000 mobile developers and enterprises to deliver mobile applications, content and services faster while reducing downtime and testing costs.

Keynote SIGOS offers active end-to-end Quality of Service (QoS) testing and monitoring solutions for mobile, fixed and VoIP communications. Its SITE and Global Roamer products are used by over 200 network operators, content providers, carriers and regulators in over 100 countries worldwide.

Keynote's 4,000 customers represent top Internet and mobile companies and include American Express, AT&T, Disney, eBay, E*TRADE, Expedia, Google, Microsoft, SonyEricsson, T-Mobile and Vodafone. Keynote Systems is headquartered in San Mateo, California and can be reached at http://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? 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. © 2012 Keynote Systems, Inc.

Keynote Systems, Inc.
Dan Berkowitz, 650-403-3305
[e-mail]