Press Release

ON24 Announces Master Services Agreement with CMP Information

ON24's Industry Leading Webcasting and Rich Media Marketing Solutions To Deliver Added Value and Extend Online Revenue Opportunities for CMPi

San Francisco, CA/London, UK – March 17, 2008 – ON24, Inc. (http://www.ON24.com), the global leader in webcasting and rich media marketing solutions, today announced a master services agreement with CMP Information (CMPi), the leading international business-to-business media company. Under the terms of the agreement, ON24 will provide webcasting, virtual conference and tradeshow, and rich media marketing solutions to CMPi. ON24's solutions will further extend CMPi's online business revenue opportunities throughout CMPi's media properties, while providing added value to advertisers and sponsors.

"There is tremendous growth opportunity for webcasting in Europe as more organisations realize the benefits of webcasting for their corporate and marketing programs," stated Paul Way, Digital Business Director, CMPi. "ON24 was the only solutions provider with the breadth of innovative webcasting solutions, global presence, and publishing industry experience to help us develop and deliver value-added online offerings to our customers."

CMPi provides targeted media solutions - exhibitions, magazines, conferences and online - in such markets as commercial property, construction and architecture, food and pharmaceutical ingredients, security, interiors and licensed trade. This master services agreement between ON24 and CMPi provides for both companies to offer webcasting, online conference and tradeshow, and rich media marketing solutions throughout CMPi properties in Europe:

• Editorial Webcasts: CMPi leverages ON24's flagship ON24 Webcast Center Enterprise platform to plan, schedule and deliver editorial webcasts on behalf of advertisers and sponsors.
• Product Casts: With ON24 Simple Audio product, CMPi offers organisations the opportunity to create 15-minute audio presentations with product information slides.
• Virtual Conferences: ON24 provides on-demand webcasting of keynote speeches and panel discussions of CMPi conferences, which enables CMPi to extend the shelf life of a physical conference to attendees.

"We are delighted to be the premier global provider of webcasting and rich media marketing solutions to CMPi, one of the leading publishers in Europe and globally," said Sharat Sharan, President and CEO, of ON24, Inc. "This partnership further strengthens our European footprint, while aligning with our global strategy to expand our business relationships and partner network in Europe, Asia-Pacific and Latin America."

ON24's webcasting and rich media marketing solutions address the global streaming communications needs of global organisations and maximise the effectiveness of online marketing campaigns. ON24's scalable and reliable webcasting solutions can support multinational companies and audiences in multiple languages, such as simplified and complex Chinese, Japanese, German, French, Spanish and Korean. ON24 has offices in Beijing, London, New York and San Francisco, providing 24/7 support to customers in Asia-Pacific, Europe and North America. For more information about ON24, the company's webcasting solutions and global capabilities, visit: http://www.ON24.com

About CMP Information
Operating internationally, CMPi provides creative professional media solutions to around 20 industry sectors. Its products, including magazines, exhibitions, conferences, awards, information products and websites, are targeted at business professionals across a range of markets; these include Construction & Architecture, Commercial Property, Licensed Trade, Travel, Agriculture and Ingredients.

CMPi has approximately 1,200 employees in the UK, US, Asia, Europe, India and South America and in 2007, generated around £192m in revenues. CMP Information a division of the London Stock Exchange-listed United Business Media plc.

About ON24, Inc.
ON24, Inc. (www.on24.com) 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™” - your B2B rich media network for information, intelligence and insight - is a trademark of ON24, Inc.