Guidance Software Reports Record Number of New Customers of the EnCase® Enterprise Platform in Q4 2011

Company adds 98 New EnCase Enterprise Customers, Compared to 32 in Q4 2010

PASADENA, Calif. (NASDAQ:GUID), the World Leader in Digital Investigations™, today announced that EnCase® Enterprise, the industry standard platform for network-enabled digital investigations, gained 98 new customers in Q4 2011. For all of 2011, the company added 285 new EnCase Enterprise customers, which is more than three times as many as the 91 new EnCase Enterprise customers added in 2010.

"Because EnCase Enterprise is a powerful platform with a proven track record, enterprises in every industry are turning to it to provide cost effective, yet credible and defensible digital investigations," said Victor Limongelli, President and CEO of Guidance Software. "We are incredibly pleased with this quarter's growth as our rapidly growing install base of EnCase Enterprise customers provides an enormous upsell opportunity for our eDiscovery and Cybersecurity products in the future."

A partial list of new customers in 2011 includes the following organizations:

• Technology/Media/Telecom:
  • Facebook
  • Rackspace
  • Cadence Design Systems
  • TIM Brasil
  • Go Daddy
  • Ingram Micro
  • Dow Jones & Company
  • Demand Media
  • Plantronics
  • Home Shopping Network
  • The McGraw-Hill Companies
  • Charter Communications
• Industrial/Manufacturing:
  • 3M
  • Huntsman
  • Chemtura
  • Gulfstream Aerospace
  • Rio Tinto
  • DuPont
  • Rockwell Automation
• Energy/Utilities:
  • National Oilwell Varco
  • American Water Works Company
  • Northeast Utilities
  • Hydro One Networks
  • Los Angeles Department of Water and Power
  • Saudi Aramco
  • Tennessee Valley Authority
• Retail/CPG:
  • Cracker Barrel Old Country Store
  • The Gap
  • Tyson Foods
  • McKee Foods
  • Sears Holdings
  • Kellogg Company
  • Chipotle Mexican Grill
  • Tesco
• Financial Services:
  • Grupo BBVA
  • Heartland Payment Systems
  • Erie Insurance Group
  • Dun & Bradstreet
  • Credit Suisse Group
  • Hudson City Bancorp
  • First Republic Bank
  • Commerce Bancshares
  • U.S. Bancorp
  • H&R Block
  • Nuveen Investments
  • Nara Bancorp
  • Ameriprise Financial
  • National Australia Bank
  • Bank of the West
  • Pacific Life Insurance Company
• Pharmaceuticals/Healthcare:
  • Maxim Healthcare Services
  • Orlando Health
  • Horizon Blue Cross Blue Shield of New Jersey
  • Memorial Sloan-Kettering
  • New York-Presbyterian Hospital
  • DaVita
  • Cleveland Clinic
  • Oklahoma Heart Hospital
  • Thermo Fisher Scientific
  • McKesson
• Local Governments:
  • Australian Capital Territory
  • Jeddah Municipality (Saudi Arabia)
  • City of Oakland
  • Dallas County
  • City of Fort Worth
  • Province of Manitoba (Canada)
  • City of Grand Junction
  • Durham County Council (UK)
  • City of Auckland (NZ)

For more information on the EnCase Enterprise platform, please visit .

About Guidance Software, Inc.

Guidance Software is recognized worldwide as the industry leader in digital investigative solutions. Its EnCase® platform provides the foundation for government, corporate and law enforcement organizations to conduct thorough, network-enabled, and court-validated computer investigations of any kind, such as responding to e-discovery requests, conducting internal investigations, responding to regulatory inquiries or performing data and compliance auditing - all while maintaining the integrity of the data. There are more than 40,000 licensed users of the EnCase technology worldwide, the EnCase® Enterprise platform is used by more than 60 of the Fortune 100, and thousands attend Guidance Software's renowned training programs annually. For more information about Guidance Software.

EnCase®, EnCE®, EnCEP®, EnScript®, FastBloc®, Guidance Software™ and Tableau™ are registered trademarks or trademarks owned by Guidance Software in the United States and other jurisdictions and may not be used without prior written permission. All other marks and brands may be claimed as the property of their respective owners.

Forward Looking Statements

This news release contains forward-looking statements within the meaning of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Investors are cautioned that forward-looking statements in this release involve risks and uncertainties that could cause actual results to differ materially from current expectations. There can be no assurance that demand for the Guidance Software's products will continue at current or greater levels, or that the Company will continue to grow revenues, or be profitable. There are also risks that the Guidance Software's pursuit of providing network security and eDiscovery technology might not be successful, or that if successful, it will not materially enhance the Guidance Software's financial performance; that the Company could fail to retain key employees; that changes in customer requirements and other general economic and political uncertainties could impact the Guidance Software's relationship with its customers; and that delays in product development, competitive pressures or technical difficulties could impact timely delivery of next-generation products; and other risks and uncertainties that are described from time to time in Guidance Software's periodic reports and registration statements filed with the Securities and Exchange Commission. The Company specifically disclaims any responsibility for updating these forward-looking statements.

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Guidance Software, Inc.
Alex Andrianopoulos
626-229-9191
[e-mail]

Source: Guidance Software, Inc.

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