Press Release

ON24, Inc. Awarded Contract Renewal with Horizon House Publications

Worldwide Broadband Growth Spurs Demand for Sophisticated Webcasting and Rich Media Marketing Solutions for Global Interactive Marketing Initiatives

San Francisco, CA – September 24, 2007 – ON24, Inc., the global leader in webcasting and rich media marketing solutions, today announced the company has been awarded a contract renewal with Horizon House® Publications. The contract covers a series of webcasting solutions and full-service event management services for Horizon House.

Horizon House serves the technology and business information needs of communications professionals through the publisher's marquee publications Microwave Journal® and Telecommunications. ON24's scalable and reliable webcasting platform enables Horizon House to organize and produce high-quality telecom and information technology webcasts for hundreds and thousands of senior-level executives and engineers worldwide.

"We are pleased to continue our webcasting partnership with ON24," said Jared Bazzy, Vice President of Horizon House Publications. "ON24's exemplary professional services team, robust webcasting platform, and international presence will enable us to provide the level of services and quality that our sponsors expect from us in the U.S. and as we expand internationally."

"We are delighted to have the opportunity to work with Horizon House on their webcasting program," said Chuck Ellison, Vice President of Sales and Marketing, ON24, Inc. "This contract renewal demonstrates our deep understanding of the publishing industry and supports our strategy to be the leading provider of innovative streaming audio and video solutions to publishers."

ON24 provides publishers a comprehensive suite of webcasting and rich media marketing solutions to plan, schedule and deliver live and on-demand audio and video webcasts. Key features for publishers include:

• Customization and Branding: ON24 provides publishers and their sponsors flexibility to reinforce corporate identity with easily branded and customized event lobbies, registration pages, and event consoles.
• Real-Time Reporting and Lead Scoring: With ON24's real-time reporting and lead-scoring backend, publishers and sponsors can develop, identify, manage and prioritize more qualified sales leads based on sales criteria.
• Event Management: Dedicated ON24 event managers coordinate all activities before, during, and after the event. They assist and advise on a variety of topics, including the selection of presentation views and tools, effective use of graphics, synchronizing with multiple presenters, and timing. ON24 provides extensive training for those publishers seeking to self-produce events.

For more information about ON24's webcasting and rich media marketing solutions for publishers, visit: http://ON24.com/industrysolutions_publishing.html.

About Horizon House® Publications
Horizon House serves the technology and business information needs of communications professionals worldwide with the highest quality Websites, live events, magazines, and books in the industry. We unite the depth and reliability of the brick and mortar trade-publishing world with the instant access and communication power of the World Wide Web.

About ON24, Inc.
ON24 Inc. is the global leader of webcasting and rich media marketing solutions. ON24's solutions provide companies a full range of applications and services to meet corporate and marketing initiatives such as lead generation, conferences and events, product launches, continuing professional education, internal communications, and executive announcements.

More than 600 global organizations in publishing, technology, life sciences, government, and financial services rely on ON24, including Business Objects, Cardinal Health, Cisco Systems, CMP Media, Credit Suisse, Department of Education, GE Healthcare, Hewlett-Packard, IBM, Motorola, National Science Foundation, and Samsung. ON24 is headquartered in San Francisco, with offices in Washington, D.C., New York, London and Beijing.

“A World of Webcasting Solutions. One Webcasting Provider”™ - is a trademark of ON24.

“Insight24^SM” - your B2B rich media network for information, intelligence and insight - is a service mark of ON24 Inc.