Keynote Systems to Announce Fiscal 2009 Fourth Quarter and Year End Financial Results on November 9th

SAN MATEO, Calif.--(Business Wire)--
Keynote Systems (Nasdaq:KEYN), the global leader in on-demand mobile and
Internet test & measurement solutions for continuously improving the online
experience, intends to announce its fiscal 2009 fourth quarter and year end
financial results for the periods ended September 30, 2009 after the market
closes on Monday, November 9, 2009. Keynote will host an earnings conference
call at 2:00 P.M. Pacific (5:00 P.M. Eastern).

To access the call in the U.S., please dial (866) 271-6228, and for
international callers dial (973) 638-3423 approximately 10 minutes prior to the
start of the conference call. The conference ID is #33968522. The conference
call will also be broadcast live over the Internet and available for replay for
90 days at www.keynote.com. In addition, a replay of the call will be available
via telephone for five business days, beginning two hours after the call. To
listen to the telephone replay in the U.S., please dial (800) 642-1687, and for
international callers, dial (706) 645-9291, and enter access code #33968522.

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 over 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, Keynote
FlexUse and Screen Sensing Technology 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.

Public Relations
Keynote Systems, Inc.
Dan Berkowitz, 650-403-3305
dberkowitz@keynote.com
or
Investor Relations
LHAI, Inc.
Kirsten Chapman, 415-433-3777
kchapman@lhai.com

Copyright Business Wire 2009