YouTube Back Online at 1:30 p.m. Pacific After Major Outage Today, Keynote Reports

SAN MATEO, Calif.--(BUSINESS WIRE)--Aug. 15, 2006--Keynote (Nasdaq:KEYN):

-- Site Issues Began at 7:30 a.m. Pacific

“We're currently putting out some new features, sweeping out the cobwebs and zapping a few gremlins. We'll be back later. In the meantime, please enjoy a layman's explanation of our website.”

-- YouTube Reportedly Acknowledges Outage

-- Journalists Invited to Receive Email Updates of Significant Site Outages

Keynote (Nasdaq:KEYN), The Internet Performance Authority(R), detected what appeared to be a significant outage today of the fast growing YouTube Web site beginning at approximately 7:30 a.m. pacific time. Keynote's global infrastructure of measurement computers for assessing site performance observed that the site returned online at approximately 1:30 p.m. pacific and YouTube officials have reportedly now acknowledged the six hour outage.

Earlier today when users attempted to access the YouTube Web site the following statement appeared on the site: "We're currently putting out some new features, sweeping out the cobwebs and zapping a few gremlins. We'll be back later. In the meantime, please enjoy a layman's explanation of our website."

In tracking the outage Keynote measured YouTube's speed and reliability from 25 cities around the U.S. In each case, Keynote received a quick download of the above message rather than the normal homepage of the site. Today's unplanned event underscores for companies the need to perform regular site load testing -- in addition to ongoing site monitoring. Keynote will continue to closely watch the performance of the YouTube Web site and welcomes journalist inquiries regarding the site performance (speed/reliability) of YouTube and other popular Web sites, such as MySpace.com. Journalists are invited to receive email updates of significant site outages.

Here is more information on Keynote's global infrastructure of measurement computers: http://www.keynote.com/keynote_method/keynote_method_methodology.html

About Keynote

Founded in 1995, Keynote Systems (Nasdaq:KEYN) is the global leader in Internet and mobile test and measurement services. Keynote helps approximately 2,600 corporate customers become "the best of the best" online. The business premise supporting Keynote's mission is: "Online businesses can't manage what they don't measure." As an independent and trusted third-party, Keynote provides IT and marketing executives with unbiased benchmarking data, competitive analysis and operational metrics from the customer perspective. This data measures service levels and customer experience of Web sites, broadband services and mobile communications.

Known as The Internet Performance Authority(R), Keynote manages a market-leading infrastructure of 2,100 measurement computers and mobile devices in over 120 locations and 70+ metropolitan areas worldwide that assess service levels and a panel of over 160,000 consumers who participate in interactive Web site tests that assess user experience. These online user experience tests capture customer attitude and behavior to answer the critical "why" behind the "what." Keynote's geographically distributed measurement services, on-site monitoring appliances, competitive intelligence and custom studies ensure that its customers outpace their competitors in online service levels and overall user experience.

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 650-403-2400.

Keynote, The Internet Performance Authority and Perspective are registered trademarks of Keynote Systems, Inc. Other trademarks are the property of their respective owners. (C) 2006 Keynote Systems, Inc.