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Siebel Systems Purchases IT Guru for Managing Growth of Networks and Applications

Global Leader in eBusiness Applications Software Taps OPNET's IT Guru to Plan, Manage & Optimize Rapid Network Growth

BETHESDA, MD., -- May 7, 2001 -- OPNET Technologies, Inc. (Nasdaq: OPNT), the leading provider of intelligent network management software, today announced that Siebel Systems, Inc. (Nasdaq: SEBL)—a world-class provider of eBusiness software—has purchased OPNET's IT Guru product for Siebel's IT Network Planning and Network Operations departments. The agreement comes at a time in which Siebel Systems has experienced rapid growth, and has launched 50 new sites on its network within the past six months.

According to Siebel Systems, mounting demands on its network and applications required a more comprehensive and proactive approach to network management and expansion. Commented Siebel's Gene Hertel, Senior Manager of Network Architecture, "We required a product that addresses both network fundamentals and application planning. OPNET satisfies these diverse, yet related needs."

Continued Mr. Hertel, "Factoring time and cost efficiencies, we fully anticipate OPNET's solutions will save Siebel a significant dollar amount that we can reinvest in our network systems. We are particularly confident in turning to industry-leader OPNET Technologies to deliver the expertise Siebel needs to effectively plan for, and optimize our network growth."

Also commenting on today's announcement, OPNET Technologies' Vice President of Marketing, Todd Kaloudis, stated, "Our software is unique in its ability to fully understand enterprise networks— including their routers, switches, servers, and perhaps most importantly, their networked applications."

Added Mr. Kaloudis, "IT Guru enables cutting-edge companies like Siebel Systems to achieve the high network and application performance levels they require, while keeping costs to a minimum."

IT Guru has received numerous prestigious awards, including the SuperQuest Award for Best e-Business Solution at SUPERCOMM 2000 and has already been named a finalist for this year's Well-Connected Award, sponsored by Network Computing.

About OPNET Technologies, Inc.

Founded in 1986, OPNET Technologies, Inc. is the leading provider of intelligent network management software. The OPNET product suite combines predictive modeling and a comprehensive understanding of networking technologies to enable its customers to more effectively design and deploy networks, provision services, diagnose network and application performance problems, and predict the impact of network changes. For more information about OPNET and its products, visit www.opnet.com.

About Siebel Systems, Inc.

Siebel Systems, Inc. (Nasdaq: SEBL) is the world's leading provider of eBusiness applications software. Siebel Systems provides an integrated family of eBusiness applications software enabling multichannel sales, marketing, and customer service systems to be deployed over the Web, call centers, field, reseller channels, and retail and dealer networks. Siebel Systems' sales and service facilities are located in more than 37 countries. For more information, please visit Siebel Systems' Web site at www.Siebel.com.

Safe Harbour Statement
The statements contained in this press release that are not purely historical are forward-looking statements within the meaning the Private Securities Litigation Reform Act of 1995, as amended, including statements regarding OPNET Technologies Inc.'s expectations, beliefs, intentions, or strategies regarding the future. All forward-looking statements included in this document are based upon information available to OPNET Technologies, Inc. as of the date hereof; OPNET Technologies, Inc. assumes no obligation to update any such forward-looking statements. Forward-looking statements involve risks and uncertainties, which could cause actual results to differ materially from those projected. For a discussion of such risks and uncertainties, see the Company's reports filed with the Securities & Exchange Commission, including its 10-Q for the quarter ended December 31, 2000.

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Note to editors: The word OPNET is spelled with all upper-case letters.

OPNET Media Contact:
Margarita Castillo
OPNET Technologies, Inc.
(240) 497-3000
Media@opnet.com
www.opnet.com

OPNET Investor Relations:
Mel Wesley
OPNET Technologies
(240) 497-3000
ir@opnet.com
www.opnet.com