Campbell, Calif. – December 18, 2007 – Rainmaker Systems, Inc. (NASDAQ: RMKR), a leading provider of sales and marketing solutions combining hosted application software and execution services, today announced that it has been selected by its current Fortune 50 Client to provide comprehensive lead development services for the Client's Enterprise Networking Solutions business.

The one-year engagement represents a significant expansion with this Client--it is the second agreement to be signed with this premier client within the past 60 days and the first with this particular business unit.

Rainmaker's successful track record with this global leader dates back to 2000, providing service contract renewal services to its Mid Market accounts. To date in 2007, Rainmaker has also extended its existing agreement for lead development services with this Client for an additional 18-month term and become the exclusive provider of Account Profiling Services for the Client's Enterprise and Public Sector accounts.

Rainmaker will leverage its proprietary Prospect Intelligence™ database in providing outbound tele-prospecting services to create a pipeline of qualified sales opportunities for the client's and partner's sales teams in the North American marketplace. Rainmaker will also provide comprehensive closed-loop tracking and reporting.

"Our relationship with this Client continues to grow as we consistently drive sales and marketing cost efficiencies and deliver increased revenue across multiple channels," said Michael Silton, Rainmaker's CEO. "Our data management, profiling and lead generation technologies and services are derived from decades of experience in planning, executing, and optimizing sales and marketing support programs for the world's leading business technology companies."

About Rainmaker
Rainmaker Systems, Inc. delivers sales and marketing solutions, combining hosted application software and execution services designed to drive more revenue for our clients. Our Revenue Delivery Platform^SM combines proprietary, on-demand application software and advanced analytics with specialized sales and marketing execution services. Rainmaker clients include large enterprises in a range of industries, including computer hardware and software, telecommunications, and financial services industries. For more information visit www.rmkr.com or call 800-631-1545.

NOTE: Rainmaker Systems, the Rainmaker logo, Sunset Direct and Contract Renewals Plus are registered with the U.S. Patent and Trademark Office. All other service marks or trademarks are the property of their respective owners.
 
This press release contains forward-looking statements regarding future events. These forward-looking statements are based on information available to Rainmaker as of this date and they assume no obligation to update any such forward-looking statements. These statements are not guarantees of future performance, and actual results could differ materially from current expectations. Among the important factors which could cause actual results to differ materially from those in the forward-looking statements are general market conditions, unfavorable economic conditions, our ability to execute our business strategy, our ability to integrate acquisitions without disruption to our business, the effectiveness of our sales team and approach, our ability to target, analyze and forecast the revenue to be derived from a client and the costs associated with providing services to that client, the date during the course of a calendar year that a new client is acquired, the length of the integration cycle for new clients and the timing of revenues and costs associated therewith, our client concentration given that we are currently dependent on a few significant client relationships, potential competition in the marketplace, the ability to retain and attract employees, market acceptance of our service programs and pricing options, our ability to maintain our existing technology platform and to deploy new technology, our ability to sign new clients and control expenses, the possibility of the discontinuation and/or realignment of some client relationships, and the financial condition of our clients' businesses, and other factors detailed in the Company's filings with the Securities and Exchange Commission, including our filings on Forms 10-K and 10-Q.