SANTA CLARA, CA — (Marketwire) — 05/29/09 — Data Domain, Inc. (NASDAQ: DDUP), the leading provider of deduplication storage systems, announced a customer presentation by Jules Thomas, senior systems administrator for PITT OHIO Express, at the TechTarget Storage Decisions Chicago conference. This case study session, held at a special, sponsored luncheon event at the conference, details PITT OHIO Express’ strategic deployment of VMware and Data Domain deduplication storage to manage data growth and maximize backup and recovery processes in a cost efficient and effective manner. Data Domain is a gold sponsor of the Storage Decisions Chicago conference.

Session Title: Data Domain and VMware Deliver Data Center Efficiencies

Speaker: Jules Thomas, senior systems administrator for PITT OHIO Express

Date/Time/Location: Monday, June 1 from 12:30 – 1:45 p.m. in the Columbus G Suite at the Hyatt Regency Chicago.

Session Description: PITT OHIO Express is a 2,600 employee less-than-truckload (LTL) regional freight carrier that manages more than 10,000 daily shipments. Mr. Thomas will discuss IT objectives and resulting implementation of VMware server virtualization and Data Domain deduplication storage technologies at the organization’s primary data center. He will also share techniques and best practices that have resulted in maximizing efficiencies for storing, retaining and recovering virtual machines leveraging VCB and Symantec NetBackup tools.

Registration: For additional event information or to attend the conference, please visit: http://storagedecisions.techtarget.com/chicago/index.html

Data Domain Exhibiter Booth: 107

ABOUT DATA DOMAIN

Data Domain® is the leading provider of deduplication storage systems. Thousands of companies worldwide have purchased Data Domain systems to reduce storage costs and simplify data management. Data Domain delivers the performance, reliability and scalability to address the data protection and nearline storage needs of enterprises of all sizes. Data Domain products integrate into existing customer infrastructures and are compatible with leading enterprise backup and archive software products. To find out more about Data Domain, visit www.datadomain.com. Data Domain is headquartered at 2421 Mission College Blvd., Santa Clara, CA 95054 and can be contacted by phone at 1-866-933-3873 or by e-mail at sales@datadomain.com.

CONTACT INFORMATION Data Domain Sean Lamb 408-980-4944 press@datadomain.com