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KLA-Tencor Deploys Clearwell as Critical Component of Information Assets Protection Strategy

Clearwell Email Intelligence Platform Delivers 90 Percent Reduction in the Cost and Duration of Information Security Investigations for Leading Semiconductor Equipment Manufacturer

SANTA CLARA, Calif.—July 31, 2006—Clearwell Systems, Inc., a pioneer in the emerging Email Intelligence market, today announced KLA-Tencor Corporation (NASDAQ: KLAC), the world leader in yield management and process control solutions for semiconductor manufacturing and related industries, has deployed the Clearwell Email Intelligence Platform™ to provide powerful and in-depth analysis of email as part of its global information assets protection strategy. KLA-Tencor has achieved market leadership based on the intellectual property (IP) behind its technology. With Clearwell, KLA-Tencor has further strengthened its information security, decreasing the cost and duration of email security investigations by 90 percent and mitigating risk to the enterprise.

Aggressive competition in the manufacturing industry requires KLA-Tencor to ensure confidentiality and protect its information assets. As the leader in its industry and employer of a 5,500-person staff, the company relies heavily on advanced technology solutions and a best practices approach to protect intellectual property and enforce policy. KLA-Tencor selected Clearwell for its market leading email analysis capabilities such as de-duplication, discussion threads, relevance ranking, group-to-group communication analysis and tagging.

"The growth and critical nature of our company’s email communications, coupled with operations in a highly competitive industry, has driven our need to deploy best-in-class information security solutions," said Jeff Gurule, director of security at KLA-Tencor. "The ability to analyze email using Clearwell has led to an order of magnitude improvement in our security investigations. Clearwell’s intelligent analysis, combined with its rapid speed and accuracy make it a valuable addition to our advanced security toolkit. Plus, Clearwell is a non-intrusive, stand-alone solution that is easy to use, making it seamless for IT for deploy and support."

"Email plays a critical role in today’s information security landscape, as the volume of internal and external email communications continue to increase exponentially," said Aaref Hilaly, president and CEO of Clearwell Systems. “Clearwell delivers market-leading email analysis capabilities, enabling rapid, accurate and cost-effective security investigations. Our deployment at KLA-Tencor is testament to the significant impact of email analysis on strengthening information security and reducing corporate exposure."

About KLA-Tencor

KLA-Tencor is the world leader in yield management and process control solutions for semiconductor manufacturing and related industries. Headquartered in San Jose, Calif., the company has sales and service offices around the world. An S&P 500 company, KLA-Tencor is traded on the Nasdaq National Market under the symbol KLAC. Additional information about the company is available on the Internet at
http://www.kla-tencor.com.

About Clearwell Systems

Clearwell Systems is transforming the way enterprises discover, organize and analyze the information captured in corporate email systems. By automating the email review and analysis process, Clearwell enables business and IT executives to reduce the cost, time and risk of email analysis for legal requests, regulatory inquiries and corporate investigations. Large energy companies, major financial institutions, leading high-technology companies, governmental agencies and E-Discovery service providers have realized immediate and significant value within days of their production deployments. For more information, visit www.clearwellsystems.com.

@Symantec