Document:

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[***] INDICATES THAT TEXT HAS BEEN OMITTED WHICH IS THE SUBJECT OF A
CONFIDENTIAL TREATMENT REQUEST. THIS TEXT HAS BEEN FILED SEPARATELY WITH THE
SEC.

                                                                   EXHIBIT 10.18

                          SOFTWARE LICENSING AGREEMENT

THIS SOFTWARE LICENSE AGREEMENT is entered into as of this 17th day of December,
2003 (hereinafter "Effective Date") by and between Dell Products L.P.
(hereinafter "Dell") with its principal place of business at One Dell Way, Round
Rock, Texas 78682, and CommVault Systems, Inc., a Delaware corporation having a
principal place of business at 2 Crescent Place, Oceanport, New Jersey 07757
(hereinafter "Licensor").

1.0  DEFINITIONS

1.1  AGREEMENT shall mean this Software License Agreement and its Supplement.

1.2  LICENSED PRODUCT(S) shall mean: (i) the software in object code form and
     documentation listed in the Supplement to this Software License Agreement
     and (ii) all improvements, corrections, modifications, alterations,
     revisions, extensions, upgrades, national language versions and/or
     enhancements to the software in object code form and/or documentation made
     during the term of this Agreement (hereinafter "Updates").

1.3  SUPPLEMENT shall mean the supplement executed under this Software License
     Agreement. The supplement shall describe the Licensed Product(s) and may
     include additional terms and conditions such as compensation, delivery
     schedules, technical contacts and other information related to the Licensed
     Product(s). The terms and conditions of this Software License Agreement
     shall apply to the Supplement.

2.0  OBJECT CODE LICENSE

2.1  Licensor hereby grants to Dell a non-exclusive, worldwide, and, subject to
     Section 9, below, irrevocable right and license, under all copyrights,
     patents, patent applications, trade secrets and other necessary
     intellectual property rights, to: (i) use, make, execute, reproduce,
     display, perform, the Licensed Product(s), in object code form, (ii)
     distribute and license, the Licensed Product(s), in object code form, as
     part of, in conjunction with, or for use with, Dell systems and (iii)
     authorize, and license third parties to do any, some or all of the
     foregoing. Dell shall have the option to distribute the Licensed Product(s)
     to end users pursuant to Licensor's end user license agreement

2.2  The above grant includes, without limitation, the right and license to: (i)
     use Licensor's trade names, product names and trademarks (the "Trademarks")
     in connection with the marketing and distribution of Licensed Product(s)
     and (ii) all pictorial, graphic and audio visual works including icons,
     screens and characters created as a result of execution of the Licensed
     Product(s). Dell's use of the Trademarks shall be in accordance with
     applicable trademark law. Dell agrees to consistently identify the
     Trademarks as being the property of Licensor. Dell agrees that the
     Trademarks are and will remain the sole property of Licensor and agrees not
     to do anything inconsistent with that ownership. Dell shall (a) comply with
     any requirements established by Licensor concerning the style, design,
     display and use of the Trademarks, (b) correctly use the "(R)" registration
     and "(TM)" symbols, (c) use the Trademark solely in connection with the
     appropriate products, (d) promptly inform Licensor of the use of any marks
     similar to the Trademarks and any potential infringements of the Trademarks
     which comes to Dell's attention, and (e) not misuse the Trademarks or
     engage in any unlawful activity in any way related to the use of the
     Trademarks. Dell will indemnify, defend and hold harmless Licensor and its
     officers, directors, employees and agents from and against any and all
     liabilities, losses, damages, claims, costs and expenses (including without
     limitation, reasonable attorney's fees and expenses) arising out of (i)
     misuse of the Trademarks, (ii) any statements or representations made to
     any person or entity by the Dell or its agents concerning the Products and
     (iii) any other negligent, reckless or wrongful conduct of the Dell or its
     agents arising in connection with its activities related to this Agreement
     or the Products. All sales and promotions materials (including, without
     limitation, labels, stickers, packaging or software documentation) which
     include any Trademark shall be subject to the advance review and approval
     of Licensor; it being understood that once Licensor has approved any
     particular use, Licensor need not approve any additional use which is
     substantially the same as that which has been previously approved, provided
     such future use complies with the foregoing obligations regarding Trademark
     usage. When requested, Dell shall send samples of advertising and
     promotional materials bearing any Trademark, samples of any goods bearing
     or sold under any Trademark, and any other documentation which may permit
     Licensor to determine whether the Trademark uses conform to the
     requirements of this Agreement..

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2.3  Licensor hereby grants to Dell a non-exclusive, worldwide, and, subject to
     Section 9, below irrevocable right and license, under all copyrights,
     patents, patent applications, trade secrets and other necessary
     intellectual property rights, to internally: (i) use, execute, reproduce,
     display, perform, and distribute the Licensed Product(s), for the purposes
     of enabling Dell to maintain, service and manufacture the Licensed
     Product(s) and (ii) authorize, and license third parties to do any, some or
     all of the foregoing on Dell's behalf.

3.0  COMPENSATION; PER COPY ROYALTIES, SUPPORT PRICING, AND MAINTENANCE PRICING

3.1  Dell will pay Licensor a per copy royalty as set forth in the Pricing
     Supplement for each copy of the Licensed Product(s) distributed by Dell for
     revenue. No per copy royalties shall be due for copies of the Licensed
     Product(s): (i) used or distributed for demonstration, marketing or
     training purposes, (ii) distributed to a customer as a replacement for a
     defective copy or to fix an error, (iii) used to repair or maintain a
     customer's system, (iv) held for backup or archival purposes, (v) returned
     by a customer, (vi) used for manufacturing or testing purposes or (vii)
     distributed to an existing customers as an upgrade to their existing copy
     of the Licensed Product(s).

3.2  Unless provided otherwise in a Schedule, all prices will be in U.S. dollars
     and are exclusive of applicable value, added, sales, use, excise, or
     similar taxes for which Dell shall be obligated to pay licensor. Dell will
     have no liability for any taxes based on Licensor's net assets or income or
     for which Dell has an appropriate resale or other exemption. Licensor shall
     be the importer of record for VAT/GST purposes (applicable in the country
     of incorporation). All payments shall be made in United States currency.
     Licensor acknowledges that there is no minimum aggregate royalty due under
     this Agreement and that any royalties received will be based solely on the
     criteria set forth above. Licensor acknowledges and agrees that Dell has
     the right to withhold any applicable taxes from any royalties due under
     this Agreement if required by any government agency.

3.3  Dell shall pay Licensor the amounts set forth in the Pricing Supplement
     during the term of this Agreement and for so long thereafter as Licensor
     has any obligations under Exhibit C ("Support") or to provide maintenance
     as described in Section 4.2 below.

4.0  SUPPORT, TRAINING AND MAINTENANCE

4.1  Licensor shall, at its expense, train Dell personnel to set up, install,
     configure and operate the Licensed Product(s) and provide such other
     training to assist and enable Dell to fully perform and exercise its rights
     under this Agreement. Such training shall be completed thirty (30) days
     prior to Dell's commercial introduction of the Licensed Product(s).
     Thereafter, further training of additional Dell personnel will be conducted
     by the Dell personnel previously trained by Licensor. Additional training
     periods for Updates, if any shall also be provided at Licensor's expense
     and within a mutually agreed upon time period.

4.2  During the term of this Agreement, and for a period of up to three years
     after the termination of the Agreement, as long as Dell has not breached
     this Agreement, Licensor shall, provide Dell with all maintenance releases
     generally made available by Licensor to licensees of the Licensed
     Product(s).

4.3  During the term of this Agreement, and for a period of up to three years
     after the termination of the Agreement, as long as Dell has not breached
     this Agreement, the parties shall provide and comply with the Support
     obligations set forth in Exhibit C.,

5.0  END USER LICENSE
     Dell acknowledges that all software sold separately or with hardware and
     obtained by Dell from Licensor is proprietary to Licensor and its licensors
     and is subject to patents and/or copyrights owned by Licensor and/or its
     licensors. Any references to "purchases" of software and Products
     containing software products signify only the purchase of a license to use
     the software in question pursuant to the terms of the Licensor's then
     current applicable end user license agreement, as provided to Dell,, a copy
     of which Licensor has and will have included with the Products and which is
     incorporated herein in its entirety by this reference for the term of this
     Agreement. Notwithstanding anything to the contrary contained herein, Dell
     agrees to be bound by all of the terms of such end

Dell Confidential                       2

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     user license agreement and agrees that it will acquire no rights with
     respect to such software Product other than the right to use such software
     pursuant to the terms of such software license agreement.

6.0  REPRESENTATIONS AND WARRANTIES

     On an ongoing basis, Licensor represents and warrants that:

     (a)  the Licensed Product(s) will operate in accordance with its written
          specifications;

     (b)  Licensor has all the necessary rights, titles and interests in the
          Licensed Product(s) to grant Dell the rights and licenses contained in
          this Agreement;

     (c)  the Licensed Product(s) shall not infringe any copyright, patent,
          trade secret or any other intellectual property rights or similar
          rights of any third party;

     (d)  the Licensed Product(s) does not contain any known viruses,
          expiration, time-sensitive devices or other harmful code that would
          inhibit the end user's use of the Licensed Product(s) or Dell system;

     (e)  Licensor and the Licensed Product(s) comply with all governmental
          laws, statutes, ordinances, administrative orders, rules and
          regulations and that Licensor has procured all necessary licensees and
          paid all fees and other charges required so that Dell can exercise the
          rights and license granted under this Agreement;

     (f)  Licensor has a proprietary and invention assignment agreement for
          employees which provides for a waiver or agreement not to assert any
          rights in the Licensed Product(s)

     (g)  There is no restriction of any relevant governmental authority which
          prohibits the export of the Licensed Product(s) to countries outside
          the United States and Canada, other than those laws of the United
          States which prohibit exports generally , as may be modified from time
          to time, including without limitation, to Libya, Cuba, North Korea,
          Syria, Sudan, Iran and Iraq; and

     (h)  Licensor has and will continue to comply with all applicable
          governmental laws, statutes, rules and regulations including, but not
          limited to, those related to export of product and technical data, and
          Licensor agrees that for any updates, upgrades and new products which
          are licensed to Dell pursuant to the terms of this Agreement, Licensor
          shall provide prior written notice of any facts which would make the
          foregoing representations untrue.

     (i)  Either (i) the Licensed Product(s) are not encrypted, nor do they
          contain encryption capability; or (ii) if the Licensed Product(s) does
          contain encryption capabilities, Licensor agrees to adhere to the
          requirements described in Exhibit A.

In addition to Licensor's end user license agreement, Licensor hereby makes the
following additional ongoing representations and warranties:

     (l)  Licensor will warrant the Licensed Product(s) directly to the end-user
          in accordance with the terms and conditions set forth in Licensor's
          end-user license agreement; and

     (m)  Licensor has agreed to honor all replacement requests received from
          Dell or end users under the terms of Licensors end user license
          agreement pertaining to defective Licensed Product(s).

7.0  LIMITED WARRANTY

     Licensor warrants that the Products sold hereunder shall be new and shall
     operate substantially in accordance with its user documentation for a
     period of ninety (90) days from the date of shipment by Licensor
     (hereinafter the "Warranty Period"). If, during the Warranty Period, Dell
     believes any Product to be defective, Dell shall immediately notify
     Licensor in writing and shall follow Licensor's instructions regarding the
     return of such Product. Licensor's sole liability to Dell, and Dell's sole
     remedy, shall be, at Licensor's option, (i) repair or replacement of the
     Product which does not comply with this Limited Warranty, or (ii) return of
     the amount paid by Dell for the Product which does not comply with the
     Limited Warranty. In the event Licensor determines that the Product is in
     compliance with this Limited Warranty, Dell shall pay the cost of all
     charges associated with the inspection and shipment of such Product by
     Licensor.

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     LICENSOR DOES NOT WARRANT THAT THE PRODUCTS WILL OPERATE UNINTERRUPTED OR
     ERROR FREE. THIS LIMITED WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES.
     LICENSOR DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, EITHER IN FACT
     OR BY OPERATION OF LAW, STATUTORY OR OTHERWISE, AND LICENSOR EXPRESSLY
     EXCLUDES AND DISCLAIMS ANY WARRANTY OF MERCHANTABILITY, FITNESS FOR A
     PARTICULAR PURPOSE, SATISFACTORY QUALITY, AND NONINFRINGEMENT OF
     INTELLECTUAL PROPERTY RIGHTS. THE PROVISIONS SET FORTH ABOVE STATE
     LICENSOR'S ENTIRE RESPONSIBILITY AND YOUR SOLE AND EXCLUSIVE REMEDY WITH
     RESPECT TO ANY BREACH OF ANY WARRANTY.

     NO CONSEQUENTIAL DAMAGES. LICENSOR WILL NOT, UNDER ANY CIRCUMSTANCES, BE
     LIABLE TO DELL OR ANY OTHER PARTY, FOR COSTS OF PROCUREMENT OF SUBSTITUTE
     PRODUCTS OR SERVICES, LOST PROFITS, LOST OPPORTUNITY COSTS, LOSS OF
     INFORMATION OR DATA OR ANY OTHER SPECIAL, INDIRECT OR CONSEQUENTIAL
     DAMAGES, REGARDLESS OF THE FORM OF ACTION ARISING OUT OF OR RELATING TO
     THIS WARRANTY OR RESULTING FROM THE SALE OF PRODUCTS OR USE BY DELL OR ANY
     OTHER PARTY OF SUCH PRODUCTS, EVEN IF LICENSOR HAS BEEN NOTIFIED OF THE
     POSSIBILITY OF SUCH DAMAGES AND NOTWITHSTANDING ANY FAILURE OF AN ESSENTIAL
     PURPOSE OF THIS LIMITED WARRANTY.

8.0  INDEMNIFICATION

8.1  Licensor shall fully indemnify, defend and hold harmless Dell, Dell, Inc.,
     Dell, Inc.'s subsidiaries and affiliates and all of the foregoing entities'
     officers, directors, employees, agents, customers and licensees, and their
     successors and assigns, from and against any and all third party claims,
     actions, suits, legal proceedings, demands, liabilities, damages, losses,
     judgments, settlements, costs and expenses, including, without limitation,
     attorney's fees, arising out of or in connection with any alleged or
     actual:

               (i) infringement by Licensor and/or the Licensed Product(s) of
          any copyright, patent, trade secret or other intellectual property
          rights or similar rights of any third party;

               (ii) damage to any real and tangible property, personal injury,
          death or any other damages or losses sustained by whomever suffered,
          resulting, or claimed to result, in whole or in part from any alleged
          or actual defect in the Licensed Product(s) whether latent or patent,
          including any alleged or actual improper construction or design or the
          failure of the Licensed Product(s) to comply with its written
          specifications or any express or implied warranties.

8.2  In the event that Dell becomes aware of any such claim, Dell shall: (i)
     notify Licensor of such claim, (ii) cooperate with Licensor in the defense
     thereof. Licensor and Dell, at Dell's discretion, shall have the right to
     participate in the defense of any such claim or action. Dell shall not
     settle any such claims without the Licensor's prior consent, which consent
     shall not be unreasonably withheld. If Dell complies with the provisions
     hereof, Licensor will pay all damages, costs and expenses finally awarded
     to third parties against Dell in such action.

8.3  In addition to Licensor's obligations under Subsection 8.1 above, in the
     event that a claim of infringement is made with regard to the Licensed
     Product(s), or in Licensor's opinion might be held to infringe as set forth
     above, Licensor shall, at its own expense and option, procure for Dell the
     right to exercise the rights and licenses granted to Dell under this
     Agreement or modify the Licensed Product(s) such that it is no longer
     infringing. If neither of such alternatives is, in Licensor's opinion,
     commercially reasonable, the infringing Product shall be returned to
     Licensor and Licensor 's sole liability, in addition to its obligation to
     reimburse awarded damages, costs and expenses set forth above, shall be to
     refund the amounts paid to Licensor by Dell for such Product. Licensor will
     have no liability for any claim of infringement arising as a result of
     Dell's use of a Product in combination with any items not supplied by
     Licensor, or any modification of a Product by Dell or third parties.

     THIS SECTION 8 STATES THE ENTIRE LIABILITY OF LICENSOR TO DELL OR ANY
     SUBSEQUENT PURCHASER, LESSEE, END USER OR ASSIGNEE OF PRODUCTS CONCERNING
     INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS, INCLUDING BUT NOT LIMITED TO,
     PATENT, COPYRIGHT AND TRADE SECRET RIGHTS.

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9.0  TERM AND TERMINATION OF AGREEMENT

9.1  Unless earlier terminated as provided below, the term of this Agreement
     shall be for three (3) years from the Effective Date and, unless either
     party gives thirty (30) days notice of nonrenewal prior to the end of the
     initial term or any renewal term, this Agreement shall automatically renew
     for successive one (1) year periods.

9.2  Either Party may, at its option and upon written notice to the other Party,
     terminate this Agreement if: (a) a material breach of this Agreement by the
     other Party is not remedied within thirty (30) Days after the breaching
     Party's receipt of written notice of the breach; (b) the other Party admits
     in writing its inability to pay its debts generally as they become due,
     files a petition for bankruptcy or executes an assignment for the benefit
     of creditors or similar document; (c) a receiver, trustee in bankruptcy or
     similar officer is appointed for the other Party's property; or (d) a
     majority interest of the equity or assets of the other Party is transferred
     to an unrelated third party or this Agreement is assigned without the prior
     written consent of the other Party to this Agreement. Dell may terminate
     this Agreement without cause upon prior written notice to the other party.
     Neither party will have any liability to the other arising from such a
     termination of the Agreement, provided the termination is properly noticed

9.3  All licenses and sublicenses granted to customers and other licensees under
     this Agreement, and all provisions of Sections, 9.0, 10.0 and 11.0, shall
     survive any expiration or termination of this Agreement and shall bind the
     parties and their successors, heirs, assigns and legal representatives. In
     addition, Licensor's obligations under Section 4, 5, 6,7 and 8 shall
     survive for one (1) year after any expiration or termination of this
     Agreement in order for Dell to satisfy its then existing contractual
     obligations to its customers and licensees. Dell shall retain a limited
     license in accordance with Section 2 to use the Licensed Product(s) in
     order to satisfy such obligations and to exhaust its inventory of Licensed
     Product(s) existing at expiration or termination, provided that Dell's
     right to exhaust any such inventory shall not extend beyond 180 days after
     expiration or termination. Thereafter, Dell agrees to return or destroy all
     additional copies of the Licensed Product(s) in its possession.

10.0 LIMITATION OF LIABILITIES

10.1 EXCEPT AS SET FORTH IN SECTION 10.2, NEITHER PARTY SHALL BE LIABLE FOR ANY
     INDIRECT, INCIDENTAL, PUNITIVE OR CONSEQUENTIAL DAMAGES UNDER ANY PART OF
     THIS AGREEMENT EVEN IF ADVISED OR AWARE OF THE POSSIBILITY OF SUCH DAMAGES.

10.2 EXCEPT FOR LICENSOR'S OBLIGATIONS UNDER SECTION 9 "INDEMNIFICATION" AND
     SECTION 12 "CONFIDENTIALITY", DELL AGREES THAT LICENSOR'S LIABILITY TO DELL
     IN ANY WAY CONNECTED WITH THE SALE OF PRODUCTS TO DELL, REGARDLESS OF THE
     FORM OF ACTION, SHALL IN NO EVENT EXCEED THE PRICE PAID BY DELL FOR SUCH
     PRODUCTS. UNDER NO CIRCUMSTANCES WILL LICENSOR BE LIABLE FOR ANY DAMAGES
     RESULTING FROM LICENSOR 'S FAILURE TO MEET ANY DELIVERY SCHEDULE, EVEN IF
     LICENSOR HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. IN NO EVENT
     WILL LICENSOR BE LIABLE FOR COSTS OF PROCUREMENT OF SUBSTITUTE PRODUCTS OR
     SERVICES, LOST PROFITS, LOST OPPORTUNITY COSTS OR ANY SPECIAL, INDIRECT,
     CONSEQUENTIAL OR INCIDENTAL DAMAGES, HOWEVER CAUSED AND ON ANY THEORY OF
     LIABILITY, ARISING IN ANY WAY OUT OF THESE TERMS OR THE SALE OF PRODUCTS OR
     SERVICES TO DELL. THIS LIMITATION SHALL APPLY EVEN IF LICENSOR HAS BEEN
     ADVISED OF THE POSSIBILITY OF SUCH DAMAGES AND NOTWITHSTANDING ANY FAILURE
     OF ESSENTIAL PURPOSE OF ANY LIMITED WARRANTY.

11.0 CONFIDENTIAL INFORMATION

11.1 The parties agree that information exchanged under this Agreement that is
     considered by either party to be confidential information will be subject
     to the terms and conditions of the non-disclosure agreement in place
     between the parties. If the parties have not executed a non-disclosure
     agreement, the parties will negotiate in good faith the terms of such an
     agreement. Licensor shall not provide to Dell any information that is
     considered confidential information of any third party.

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11.2 At Dell's request, which shall not be made more frequently than once per
     quarter per year, Licensor will provide unaudited, or audited, financial
     statements to Dell.

12.0 [***]

13.0 MISCELLANEOUS

13.1 This Agreement shall in no way preclude Dell from independently developing,
     having developed or acquiring or marketing any products or services nor
     shall it in any way preclude Dell from entering into any similar agreement
     with any other party.

13.2 Dell shall have full freedom and flexibility in its decisions concerning
     the distribution and marketing of the Licensed Product(s) including,
     without limitation, the decision of whether or not to distribute or
     discontinue distribution of the Licensed Product(s). Dell does not
     guarantee that its marketing, if any, of the Licensed Product(s) will be
     successful.

13.3 This Agreement may not be assigned by Licensor, in whole or in part,
     including without limitation by operation of law, in a merger or stock or
     asset sale, without the express written permission of Dell. If Licensor
     makes any attempt to assign this Agreement without Dell's written consent,
     Dell will have the option to immediately terminate this Agreement. No
     permitted assignment or subcontract by Licensor shall relieve Licensor of
     any obligations hereunder. Licensor shall always remain jointly and
     severally liable with any assignees under this Agreement. In the event Dell
     terminates this Agreement under this section Licensor will have no
     liability to Dell in respect of such termination.

13.4 Licensor is an independent contractor. Licensor is not a legal
     representative or agent of Dell, nor shall Licensor have the right or
     authority to create or incur any liability or any obligation of any kind,
     express or implied, against, or in the name of, or on behalf of Dell.

13.5 Provider represents and warrants that the prices for Products shall not be
     less favorable than prices applicable to sales by Provider to any other
     customer purchasing like quantities of the same products under comparable
     terms. If at any time during the term of this Agreement Provider accords to
     any other such customer more favorable prices, Provider shall immediately
     offer to sell the Products to Dell at equivalent prices accorded to such
     other customer. Dell, or Dell's agent, may audit Provider's compliance with
     this Section 5 upon reasonable notice to Provider and subject to the
     confidentiality provisions of Section 15 of this Agreement and the
     applicable NDA, Dell may audit Provider's manufacturing locations or
     corporate headquarters and review and copy any information reasonably
     relevant to the purpose of any audit permitted by this Agreement.
     Notwithstanding anything to the contrary contained herein, Licensor shall
     have no obligation to disclose confidential information which is the
     subject of another confidentiality agreement. In addition, Dell may: (a)
     inspect Products at any stage of production or testing; (b) review
     Provider's facilities and quality control procedures; and (c) accompany
     Dell customers on visits to Provider's manufacturing locations. Provider
     will furnish, or cause to be furnished (without charge), all reasonable
     facilities and assistance necessary for the safety and convenience of any
     personnel performing the audits.

13.6 Licensor shall not publicize the existence of this Agreement with Dell nor
     refer to Dell in connection with any promotion or publication without the
     prior written approval of Dell. Further, Neither Party shall disclose the
     terms and conditions of this Agreement to any third party, including, but
     not limited to, any financial terms, except as required by law or with the
     prior written consent of the other Party.

13.7 Licensor shall comply with all applicable governmental laws, statutes,
     ordinances, administrative orders, rules and regulations including, without
     limitation, those related to the export of technical materials. Licensor
     shall provide Dell with prompt written notice of any export restrictions
     related to the Licensed Product(s).

13.8 Any and all written notices, communications and deliveries between Licensor
     and Dell with reference to this Agreement shall be deemed made on the date
     of mailing if sent by registered or certified mail to the respective
     address of the other party as follows:

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              In the case of Dell:        Dell Products L.P.
                                          One Dell Way
                                          [***]
                                          Round Rock, TX 78682
                                          Attn: [***]

              In the case of Licensor:    CommVault Systems, Inc.
                                          2 Crescent Place
                                          Oceanport, NJ 07757
                                          Attn: Finance
                                                Cc: Legal Department

13.9  This Agreement shall be governed by and interpreted in accordance with the
      laws of the State of New York, U.S.A. without regards for its rules of
      conflict of laws, as if this Agreement was executed in and fully performed
      within the State of New York. Both parties hereby waive any right to a
      trial by jury relating to any dispute arising under or in connection with
      this Agreement.

13.10 Should any provision herein be held by a court of competent jurisdiction
      to be illegal, invalid or unenforceable, such provision shall be modified
      to reflect the intentions of the parties. All other terms and conditions
      shall remain in full force and effect.

13.11 No amendment, modification or waiver of any provision of this Agreement
      shall be effective unless set forth in a writing executed by an authorized
      representative of each party. No failure or delay by either party in
      exercising any right, power or remedy will operate as a waiver of any such
      right, power or remedy. No waiver of any provision of this Agreement shall
      constitute a continuing waiver or a waiver of any similar provision unless
      expressly set forth in a writing signed by an authorized representative of
      each party.

13.12 Since Dell transacts business with the United States government, Licensor
      must comply with the applicable federal laws and Federal Acquisition
      Regulations ("FARs") including the following:

      It is Dell's policy to take affirmative action to provide equal employment
      opportunity without regard to race, religion, color, national origin, age,
      sex, disability, veterans status or any other legally protected status. As
      a condition of doing business, Dell requires Licensor to practice equal
      opportunity employment and to comply with Executive Order 11246, as
      amended, Section 503 of the Rehabilitation Act of 1973, and Section 4212
      of the Vietnam Era Veteran's Readjustment Assistance Act of 1974, all as
      amended, and the relevant Regulations and Orders of the U.S. Secretary of
      Labor. Additionally, to the extent required by applicable law, the
      following sections of Chapter 60 of Title 41 of the Code of Federal
      Regulations are incorporated by reference in this Agreement and each
      Order: 41 CFR 60-1.4(a); 41 CFR 60-1.8; 41 CFR 60-741; 41 CFR 60-250; 41
      CFR 60-1.7; 41 CFR 60-1.40.

      It is the policy of the United States (FAR 52.219-8) that small business
      concerns, small business concerns owned and controlled by socially and
      economically disadvantaged individuals and small business concerns owned
      and controlled by women shall have the maximum practicable opportunity to
      participate in performing contracts for any Federal agency. Licensor
      agrees to comply with this policy and to provide reporting of data as
      requested to the Small Business Liaison Officer, Dell, Inc., One Dell Way,
      Round Rock, Texas, 78682.

13.13 This Agreement sets forth the entire agreement and understanding of the
      parties relating to the subject matter contained herein, and merges all
      prior discussions and agreements, both oral and written, between the
      parties. Nothing in any purchase order, invoice, order acknowledgment, or
      other document of Licensor shall be of any effect whatsoever and may not
      affect, alter, or modify the terms and conditions of this Agreement. If
      the terms and conditions of this Agreement conflict with any terms of a
      Dell purchase order relating to the Licensed Product(s), the terms and
      conditions of this Agreement shall govern. The terms and conditions set
      forth in Supplements are hereby incorporated into this Software License
      Agreement by reference. If the terms and conditions of this Software
      License Agreement conflict with any terms and conditions contained in a
      Supplement, the terms and conditions of the Supplement shall govern.

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13.14      [***]

IN WITNESS WHEREOF, the parties hereto have duly executed this Software License
Agreement by their respective duly authorized officers to be effective as of the
Effective Date as first written above.

DELL PRODUCTS L.P.                     COMMVAULT SYSTEMS, INC.

By: /s/ Illegible                      By: /s/ David R. West

Title: Director, WWP                   Title: VP Business Development

Date: Dec 22, 2003                     Date: Dec. 18, 2003

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                                    EXHIBIT A

                        SOFTWARE COMPLIANCE QUESTIONNAIRE

NOTE: ENCRYPTED SOFTWARE EXPORT CONTROLS

In accordance with the U.S. Export Administration Regulations, certain software
and items possessing encryption capabilities may require formal export licenses
before they can be exported and/or re-exported from the United States.

In order to make proper licensing determinations of your software and/or
commodity it is essential that you complete the questions on the following page.

If you need assistance or have questions, please contact [***] at: [***] or tel:
[***].

If your software has not been classified and you have questions on how to
classify your software, refer to the BXA (Bureau of Export Administration)
Website at http://www.bxa.doc.gov. Under the category of Getting Help and
Contacting Us, click on the General Fact Sheets. Then click on Explanation of
what commodity classifications are or Guidance on requesting a commodity
classification.

If you are unable to provide the information required, please forward this
questionnaire to your Export Controls or Legal department.

This is a legal matter which deals with regulations on export controls and
compliance. We trust we can count on your maximum cooperation, in providing us
with the requested information by return fax to [***], or e-mail to [***].

Yours truly,

Dell, Inc.
Worldwide Export Compliance Organization

Dell Confidential                       9

<PAGE>

SOFTWARE QUESTIONNAIRE

     COMPANY NAME: _____________________________________________________________

     PRODUCT NAME & VERSION NUMBER: _______________ COUNTRY OF ORIGIN: _________

     EXPORT COMMODITY CONTROL NUMBER (ECCN): __________ LICENSE EXCEPTION: _____

     IF YOUR LICENSE EXCEPTION IS ENC, HAVE YOU HAD YOUR 1X REVIEW FOR RETAIL
     EXEMPTION? YES OR NO

CCAT NUMBER: _____________

IF PRODUCT IS 5D002, ENC, PLEASE PROVIDE A COPY OF THE BXA CLASSIFICATION
VERIFICATION (CCAT).

1.    What is the functionality of your software (i.e.: word processing,
      engineering/design, communication, operating system, etc.)?
      ___________________________________________________________

2.    What type of equipment is the software used to support (i.e.:
      telecommunications, manufacturing/test, computers, etc.)? Please be
      specific.
      ___________________________________________________________

3.    Is your software available to the public via sales from stock at retail
      selling points by means of "over-the-counter" transactions, mail order,
      or telephone call transactions (Mass Market)?

      _______________________ IF YES, PLEASE FORWARD A COPY OF BXA APPROVAL.

4.    Is your software designed for installation by the user without further
      substantial support (substantial support does not include telephone (voice
      only) help line services for installation or basic operation, or basic
      operation training provided by the supplier? _____________________________
      _________________________________

5.    Does your software or commodity have encryption capabilities? ____________
      _______________________

IF THE ANSWER TO QUESTION 5 ABOVE IS "NO", YOU DO NOT NEED TO COMPLETE THE
REMAINING QUESTIONS ON THIS FORM.

6.    What function does the encryption provide (i.e.: password protection, data
      encryption, etc.? Please be specific.
      _______________________________________________________________________

7.    Does the data encryption algorithm exceed a key space of 64 bits?  _______
      ____________________

8.    What is the specific bit level of encryption? ____________________________
      ___________________

9.    Does your software or commodity allow the alteration of the data
      encryption mechanism and its associated key spaces by the user?
      ______________________________________________________________

10.   Please provide a brief written summary of the encryption technology used
      in the design of the software or commodity in question. Please be sure to
      identify the type of algorithm used.
      _____________________________________________________________________
      _____________________________________________________________________

Dell Confidential                       10

<PAGE>

11.   Is there an EXPORT version of the software named above? __________________
      _______________

THIS FORM COMPLETED BY:

Name: ________________ Title: ________________ Signature: ____________________

Date: _______________ Phone #: ________________

Dell Confidential                      11

<PAGE>

                               PRICING SUPPLEMENT
                                     TO THE
                          SOFTWARE LICENSING AGREEMENT
                                     BETWEEN
                                      DELL
                                        &
                             COMMVAULT SYSTEMS, INC.

<TABLE>
<CAPTION>
SKU DESCRIPTION              [***]      [***]        MSRP      DISCOUNT
---------------              -----      -----       -----      --------
<S>                          <C>        <C>         <C>        <C>
[***]                        [***]      [***]       [***]        [***]

[***]                        [***]      [***]       [***]        [***]

[***]                        [***]      [***]       [***]        [***]

[***]                        [***]      [***]       [***]        [***]

[***]                        [***]      [***]       [***]        [***]

[***]                        [***]      [***]       [***]        [***]

[***]                        [***]      [***]       [***]        [***]

[***]                        [***]      [***]       [***]        [***]

[***]                        [***]      [***]       [***]        [***]

[***]                        [***]      [***]       [***]        [***]

[***]                        [***]      [***]       [***]        [***]

[***]                        [***]      [***]       [***]        [***]

[***]                        [***]      [***]       [***]        [***]

[***]

[***]                                               [***]        [***]
</TABLE>

Dell Confidential                       12

<PAGE>

                                   SCHEDULE C
                               ENTERPRISE SUPPORT

[***]

Dell Confidential                      13<PAGE>

[***] INDICATES THAT TEXT HAS BEEN OMITTED WHICH IS THE SUBJECT OF A
CONFIDENTIAL TREATMENT REQUEST. THIS TEXT HAS BEEN FILED SEPARATELY WITH THE
SEC.

                                                                   EXHIBIT 10.19

                                  ADDENDUM ONE
                                     TO THE
                       LICENSE AND DISTRIBUTION AGREEMENT
                                     BETWEEN
                               DELL PRODUCTS L.P.
                                       AND
                             COMMVAULT SYSTEMS, INC.

This Addendum One ("Addendum One") to the Software License Agreement dated
December 17, 2003 (the "Agreement"), is entered into by and between DELL
PRODUCTS L.P. (HEREINAFTER "DELL") WITH ITS PRINCIPAL PLACE OF BUSINESS AT ONE
DELL WAY, ROUND ROCK, TEXAS 78682, AND COMMVAULT SYSTEMS, INC., (HEREINAFTER
"COMMVAULT") A DELAWARE CORPORATION HAVING A PRINCIPAL PLACE OF BUSINESS AT 2
CRESCENT PLACE, OCEANPORT, NEW JERSEY 07757 AND IS EFFECTIVE AS OF THE 11TH DAY
OF MARCH, 2004 (THE "EFFECTIVE DATE")

                                    RECITALS

WHEREAS, COMMVAULT and Dell entered into the Agreement through which COMMVAULT
granted Dell various rights to distribute certain COMMVAULT software products;

WHEREAS, the parties now desire to amend the Agreement.

NOW THEREFORE, in consideration of the mutual covenants and promises set forth
herein and for other good and valuable consideration, the receipt of which both
parties hereby acknowledge, Dell and COMMVAULT agree as follows:

Any capitalized terms defined in this Addendum are specific to this Addendum
only, and do not modify or change the meaning set forth in the Agreement. Unless
expressly defined in this Addendum, the capitalized terms in this Addendum are
as defined in the Agreement. The Agreement shall remain in full force and effect
except as supplemented and amended herein.

1. COMMVAULT agrees to assist Dell with processing orders and key codes for as
long as Dell continues to offer customers COMMVAULT software products. Both
parties will work to define a mutually agreeable process.

Customer Data: To the extent that COMMVAULT received Dell's customer data,
including but not limited to customer name, telephone number, address, email
address or any data that identifies a particular customer ("Customer Data"),
COMMVAULT shall (i) treat such data as confidential in accordance with the
Confidentiality provisions of this Agreement, Dell's posted Privacy Policy, as
attached Exhibit A to this Addendum One, and any applicable laws, rules, and
regulations; (ii) use such data only as necessary to perform the requested
service and not for any independent marketing activities, and (iii) transmit
such data via secure means.

In the event that Dell's Privacy Policy changes and Dell desires to update the
policy, Dell shall notify COMMVAULT of the change by written notice, at which
time Exhibit A of this Addendum One will be deemed to have been amended with the
updated policy.

2. Replace the first sentence of section 3.1 with the following:

      "Within [***] days after the end of Dell's fiscal quarters, as described
in Section 3.4 below, Dell will report and pay COMMVAULT a per copy royalty as
set forth in the Pricing Supplement for each copy of the Licensed Product(s)
distributed by Dell for revenue."

3. Add the following section 3.4:

Confidential                         Page 1

<PAGE>

[***] INDICATES THAT TEXT HAS BEEN OMITTED WHICH IS THE SUBJECT OF A
CONFIDENTIAL TREATMENT REQUEST. THIS TEXT HAS BEEN FILED SEPARATELY WITH THE
SEC.

      "3.4 Dell shall submit royalty reports within [***] days after the end of
Dell's [***]. For the purposes of royalty reporting, Dell's [***] are
approximately: [***]."

4. The Pricing Supplement to Agreement is hereby replaced in its entirety with
the attached Exhibit B to this Addendum. For clarification purposes, the term
"Update Protection" shall mean that COMMVAULT will provide, on a when-and-if
available basis, any error fixes, release updates and modifications but not any
new functionality sets that are sold separately by COMMVAULT, as evidenced by a
separate sku classification and shall also include Level III support, as
specified in Section 4.0 of Schedule C to the Agreement.

No other changes or modification are intended by this Addendum. All other terms
and conditions of the Agreement are in effect.

IN WITNESS WHEREOF, the parties have executed this Addendum by their duly
authorized representatives as of the date first set forth above.

COMMVAULT SYSTEMS INC.                    DELL PRODUCTS L.P.

By:     /s/ David West                    By:      /s/ Joseph Kanicki
   --------------------------------          -------------------------------

Name:   David West                        Name:    Joseph Kanicki
     ------------------------------            -----------------------------

Title:  VP Business Development           Title:   Senior Manager
      -----------------------------             ----------------------------

Date:   4/27/04                           Date:    May 5, 2004
     ------------------------------            -----------------------------

Confidential                         Page 2

<PAGE>

                                    EXHIBIT A
                              DELL'S PRIVACY POLICY

                              DELL'S PRIVACY POLICY
                            As posted on www.dell.com

Dell respects your privacy. Across our business, around the world, we will only
collect, store and use your personal information for defined purposes. We use
your information to support and enhance our relationship with you, for example,
to process your purchase, provide service and support, and share product,
service and company news and offerings with you. We do not sell your personal
information. We only share your personal data outside the Dell family of
companies with your consent, as required by law or to protect Dell, its
customers, or the public, or with companies that help Dell fulfill its
obligations with you, and then only with partners who share Dell's commitment to
protecting your privacy and data. At any time you may contact Dell with any
privacy questions or concerns you may have. You also may ask at any time to see
the data you have given us and request correction or deletion. We strive to
ensure a high level of security and confidentiality.

PRIVACY AND DATA SECURITY

At Dell, your right to privacy and data security is a primary concern. That's
why, when you visit dell.com, we help you maintain control over your personal
data on the Internet. Below are the guidelines we use for protecting the
information you provide us during a visit to our Internet site or when you use
our online support offerings such as support.dell.com or support applications
loaded on your computer. Please refer to your warranty statement or Dell's Total
Satisfaction Policy for policies that apply to information contained on hard
drives returned to Dell. Other Dell and Dell co-branded sites may operate under
their own privacy and security policies. Visit www.nclnet.org/essentials to
learn more about how to protect your privacy on the Internet through a consumer
education campaign called Online E-ssentials, developed by Dell in partnership
with the National Consumers League.

Dell is a proud participant in the BBB Online(R) Privacy Program. The BBB OnLine
Privacy Program is backed by an organization noted for its expertise and
experience in conducting successful national self-regulation programs - the
Council of Better Business Bureaus. The mission of BBB OnLine is to promote
trust and confidence on the Internet by advocating ethical online business
practices. Further information about this program is available at
http://www.bbbonLine.org.

Dell's Privacy statement discloses the privacy guidelines for the entire
domestic Dell Web site. THE GUIDELINES AT THIS SITE ARE APPLICABLE ONLY TO THIS
DOMESTIC WEB SITE.

LOGO

DELL ONLY ASKS FOR SPECIFIC TYPES OF PERSONAL INFORMATION

In a few areas on our Web site and online customer support tools, we ask you to
provide information that will enable us to enhance your site visit, to assist
you with technical support issues or to follow up with you after your visit. It
is completely optional for you to participate.

For example, we request information from you when you:

      1.    Register on dell.com
      2.    Request a quote
      3.    Place an order
      4.    Provide feedback in an online survey
      5.    Participate in a sweepstakes or other promotional offer
      6.    Request e-mail notification of your order status (called "Order
            Watch")
      7.    Subscribe to a newsletter or a mailing list

Confidential                         Page 3

<PAGE>

      8.    Request assistance from our "Product Advisor"
      9.    Fill our a support request

In each of the instances above, we may ask for your name, e-mail address, phone
number, address, type of business, customer preference information, customer
number and service tag number, as well as other similar personal information
that is needed to register or subscribe you to services or offers. If we ever
ask for significantly different information we will inform you. In the case of
newsletters or mailing lists, you will be able to "unsubscribe" to these
mailings at any time.

DELL ONLY USES YOUR PERSONAL INFORMATION FOR SPECIFIC PURPOSES

The information you provide will be kept confidential and used to support your
customer relationship with Dell. Among other things, we want to help you quickly
find information on dell.com and alert you to product upgrades, special offers,
updated information and other new products and services from Dell. Agents or
contractors of Dell who have access to your personal information and prospect
information are required to keep the information confidential and not use it for
any other purpose than to carry out the services they are performing for Dell.
Dell may enhance or merge your information collected at its site with data from
third parties for purposes of marketing products or services to you.

In addition, Dell may be required to disclose personal information in connection
with law enforcement, fraud prevention, regulation, and other legal action or if
Dell reasonably believes it is necessary to do so to protect Dell, its
customers, or the public.

YOU CAN OPT-OUT OF RECEIVING FURTHER MARKETING FROM DELL AT ANY TIME

Periodically, we may send you information about our various products and
services, or other products and services we feel may be of interest to you. Only
Dell (or agent working on behalf of Dell and under confidentiality agreements)
will send you these direct mailings. If you do not want to receive such
mailings, simply tell us when you give us your personal information. Or, at any
time you can easily opt-out of receiving further marketing from Dell by clicking
here.

DELL WILL NOT DISCLOSE YOUR PERSONAL INFORMATION TO ANY OUTSIDE ORGANIZATION FOR
ITS USE IN MARKETING WITHOUT YOUR CONSENT

Information regarding you (such as name, address and phone number) or your order
and the products you purchase will not be given or sold to any outside
organization for its use in marketing or solicitation without your consent. Your
information may be shared with agents or contractors of Dell for the purposes of
performing services for Dell.

INTERNET COMMERCE

The online store at dell.com is designed to give you options concerning the
privacy of your credit card information, name, address, e-mail and any other
information you provide us. Dell is committed to data security with respect to
information collected on our site. We offer the industry standard security
measures available through your browser called SSL encryption, (please see
Dell's Store Security page for details on these security measures). If at any
time you would like to make a purchase, but do not want to provide your credit
card information online, you may contact a sales representative over the
telephone. Simply call 1-800-WWW-DELL. It has always been a Dell practice to
contact customers in the event of a potential problem with your purchase or any
normal business communication regarding your purchase.

CUSTOMIZED EXPERIENCE

We use technology to help us deliver customized visitor experiences. At Dell, we
primarily use "cookies" to help us determine which service and support
information is appropriate to your machine and to maintain your shopping
experience in our online store. Our use of this technology does not mean that we
automatically know any information about you. We might be able to ascertain what
type of computer you are using, but beyond that, our use

Confidential                         Page 4

<PAGE>

of cookies is designed only to provide you with a better experience when using
www.dell.com. Dell has no desire or intent to infringe on your privacy while
using the dell.com site. For more information about our use of cookies, please
click here.

THIRD-PARTY SALES

Please be aware that other web sites that may be accessed through our site may
collect personally identifiable information about you. The information practices
of those third-party web sites linked to Dell.com are not covered by this
privacy statement. We generally use the "___" symbol to mark links that go to
third-party sites.

You are solely responsible for maintaining the secrecy of your passwords or any
account information. Please be careful and responsible whenever you're online.
If you post personal information online that is accessible to the public, you
may receive unsolicited messages from other parties in return. While we strive
to protect your personal information, Dell cannot ensure or warrant the security
of any information you transmit to us, and you do so at your own risk.

CHILDREN'S PRIVACY (AGE 12 AND UNDER)

Dell takes children's privacy seriously.

Dell does not seek to collect personal information about children through its
Web site. Dell does not condition a child's participation in an activity on the
disclosure of more personal information than is reasonably necessary to
participate in the activity.

If we become aware that a person submitting a personal information to us through
any part of our Web site is a child, we delete the information as soon as we
discover it and do not use it for any purpose, nor do we disclose it to third
parties.

Since we do not seek to collect any personal information about children, and we
delete any information collected inadvertently as soon as we discover that a
child has submitted it, we typically retain no information about children that
could be reviewed or deleted. If a parent requests review or deletion of
information about their child before we have discovered and deleted the
information, then we will of course honor that request.

OTHER WEB SITES

Dell's Web site contains links to other Web sites that are not operated by Dell.
Dell is not responsible for the privacy practices of the Web sites that it does
not operate. Some parts of the Web site are animated using various downloadable
applications, such as Macromedia's Shockwave/Flash. We also make video available
through RealNetwork's Media-Player, and use the video hosting services of
Broadcast.com. Futures-Careers, Macromedia, RealNetworks, and Broadcast.com
operate under their own privacy and security policies, and the way they may
collect and use information can be further evaluated at: www.macromedia.com,
www.realnetworks.com, and www.broadcast.com.

CONTACT DELL

Dell is the sole operator of the Dell Web site. If you would like to contact us
for any reason regarding our privacy practices, please write us at the following
address:

Dell Computer Corporation
Attention:  Privacy
One Dell Way
Round Rock, Texas  78682

You may also click here and fill out the e-mail form under the topic: "Privacy
Info: Request"

Confidential                         Page 5

<PAGE>

DELL WANTS TO HELP YOU KEEP YOUR PERSONAL INFORMATION ACCURATE

You can request the individual information that Dell has collected by submitting
a request here. To view or edit the information that has been stored online,
please visit the My Account section of the Dell Web site.

Effective Date:  Oct. 11, 2003

Confidential                         Page 6

<PAGE>

                                    EXHIBIT B
                               PRICING SUPPLEMENT
                        TO THE SOFTWARE LICENSE AGREEMENT
                           BETWEEN DELL PRODUCTS L.P.
                           AND COMMVAULT SYSTEMS INC.

<TABLE>
<CAPTION>
                                                                                             1YR
                                                                               DELL         UPDATE      3YR UPDATE
SKU DESCRIPTION      [***]       [***]            MSRP        DISCOUNT       SW COST      PROTECTION    PROTECTION
---------------      -----       -----        -----------     --------     -----------   -----------   ------------
<S>                  <C>         <C>          <C>             <C>          <C>           <C>           <C>
 [***]               [***]       [***]        $     [***]       [***]      $     [***]   $     [***]   $     [***]
 [***]               [***]       [***]        $     [***]       [***]      $     [***]   $     [***]   $     [***]
 [***]               [***]       [***]        $     [***]       [***]      $     [***]   $     [***]   $     [***]
 [***]               [***]       [***]        $     [***]       [***]      $     [***]   $     [***]   $     [***]
 [***]               [***]       [***]        $     [***]       [***]      $     [***]   $     [***]   $     [***]
 [***]               [***]       [***]        $     [***]       [***]      $     [***]   $     [***]   $     [***]
 [***]               [***]       [***]        $     [***]       [***]      $     [***]   $     [***]   $     [***]
 [***]               [***]       [***]        $     [***]       [***]      $     [***]   $     [***]   $     [***]
 [***]               [***]       [***]        $     [***]       [***]      $     [***]   $     [***]   $     [***]
 [***]               [***]       [***]        $     [***]       [***]      $     [***]   $     [***]   $     [***]
 [***]               [***]       [***]        $     [***]       [***]      $     [***]   $     [***]   $     [***]
 [***]               [***]       [***]        $     [***]       [***]      $     [***]   $     [***]   $     [***]
 [***]               [***]       [***]        $     [***]       [***]      $     [***]   $     [***]   $     [***]
 [***]
 [***]
 [***]
 [***]
 [***]
 [***]
 [***]                                        $     [***]       [***]      $     [***]   $     [***]   $     [***]
</TABLE>

Confidential                         Page 7

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