Release Details

OCEANPORT, N.J. — September 22, 2006 — CommVault Systems, Inc. (NASDAQ: CVLT), a leading provider of data management software applications and related services, announced today the pricing of its initial public offering of 11,111,111 shares of its common stock at $14.50 per share (before underwriting discounts and commissions). Of those shares, CommVault is selling 6,148,148 shares and selling shareholders are selling 4,962,963 shares.

Credit Suisse Securities (USA) LLC and Goldman, Sachs & Co. are serving as the joint bookrunners of this offering, with Merrill Lynch & Co. as the Lead Manager, and Thomas Weisel Partners LLC, RBC Capital Markets and C.E. Unterberg, Towbin LLC serving as co-managers. Copies of the final prospectus relating to this offering may be obtained by contacting Credit Suisse (Eleven Madison Avenue, New York, New York, 10010; telephone 212-325-2580) or Goldman, Sachs & Co. (85 Broad Street, New York, New York 10004; telephone 866-471-2526).

This announcement shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About CommVault

CommVault® provides Unified Data Management™ solutions for high- performance data protection, universal availability and simplified management of data on complex storage networks. The CommVault® QiNetix™ platform, based on CommVault's Common Technology Engine, integrates Galaxy backup and recovery, snapshot management and recovery, remote replication, active data migration and archiving, e-mail compliance, enterprise service level management and reporting and storage resource management software solutions. The QiNetix unified approach allows customers to add/integrate QiNetix components, at a fraction of the time, effort and money required by separate point products.

Information about CommVault can be obtained by calling 732-870-4000. CommVault's corporate headquarters is located in Oceanport, New Jersey in the United States.
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©2005 CommVault Systems, Inc. CommVault Systems, CommVault Galaxy, CommVault QiNetix, DataMigrator, DataArchiver, QNet, CommServe StorageManager, MediaAgent, iDataAgent, CommCell and the CommVault logo are trademarks and may be registered trademarks in some jurisdictions of CommVault Systems, Inc. Product and company names herein may be trademarks of their respective owners.

Press Contacts:
Jeremy Skule
Fleishman-Hillard
212.453.2145
skulej@fleishman.com

Michael Picariello
CommVault, Investor Relations
732.728.5380
ir@commvault.com