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                                                                   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,

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         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..

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

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         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 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

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         with this Limited Warranty, Dell shall pay the cost of all charges
         associated with the inspection and shipment of such Product by
         Licensor.

         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.

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         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.

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.

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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.

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.

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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:

                  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.

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         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.

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

                                       8

<PAGE>

                                    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

                                       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.

         _______________________________________________________________________

                                       10

<PAGE>

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

         _______________________________________________________________________

THIS FORM COMPLETED BY:

Name: __________________ Title: ____________________ Signature: ________________

Date: _______________ Phone #: ____________________

                                       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>
CommServe                                       [***]       [***]        [***]        [***]

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

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

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

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

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

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

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

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

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

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

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

GalaxyExpress LAN Suite includes:               [***]       [***]        [***]        [***]
</TABLE>

     GalaxyExpress (key code upgrade to Galaxy)

     1 Windows, Storage Server2003, Linux or Novell MediaAgent included

     Includes support for up to 6 drive library for list of Dell supported
drives/libraries

     3 FS Agents (can purchase more FS agents from list above) for Windows,
UNIX, Linux or Novell

     1 Windows Application iDA (can purchase more Windows (only) APP agents from
list above)

     Max 25 total clients (agents), no san spt + other Gexpress limitations

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

                                       12
<PAGE>
                                   SCHEDULE C
                               ENTERPRISE SUPPORT

1.0      PURPOSE

      This Schedule C describes the support and training terms and conditions
      required by Dell.

      The working relationship between Dell and the Supplier in addressing
      different levels of customers' problems (severity incidents) should be a
      consistent, smooth, understandable process. Dell customers should perceive
      a seamless and efficient supporting organization that can meet their
      expectations on all levels of support issues with:

            -     A sense of urgency

            -     A timely resolution

            -     Concern for the customer's situation

2.0   DEFINITIONS:

      Severity 1 Support Request

      A customer problem reported to Dell where immediate Supplier engagement
      and assistance is required in providing resolution. A Severity 1 situation
      is when any of the following conditions occur:

            -     A problem, which critically impacts the end customer's ability
                  to do business.

            -     A significant number of users of the system and/or network are
                  currently unable to perform their tasks as necessary.

            -     The system and/or network are down or severely degraded.

            -     A system or major application is totally down.

      Severity 2 Support Request

      A customer problem reported to Dell where urgent Supplier engagement and
      assistance is required in providing resolution. A Severity 2 situation is
      when any of the following conditions occur:

            -     A problem which impacts the end customer's ability to do
                  business, the severity of which is significant and may be
                  repetitive in nature.

            -     A function of the system, network or product is impacted
                  which impedes the customer from meeting daily production
                  deliverables.

      Severity 3 Support Request

      A customer problem reported to Dell where timely Supplier engagement and
      assistance is required in providing resolution. A Severity 3 situation is
      when any of the following conditions occur:

-     A problem, which negligibly impacts our customer's ability to do business.

-     May include questions and/or general consultation.

3.0   SUPPLIER SUPPORT INCIDENT RESPONSE BY SEVERITY

      The Incident Severity levels defined below are utilized in establishing
      the problem impact to the customer upon problem receipt and will be used
      to set expectations between the parties of this agreement. Severities are
      established by Dell during escalation to the Supplier and are subject to
      change during the life of each specific incident.

      3.1   SEVERITY 1: [***]

      3.2   SEVERITY 2: [***]

      3.3   SEVERITY 3: [***]

4.0   TECHNICAL SUPPORT PROCEDURES

      [***].

      Where the vendor performing installation and Professional Service
      Offerings of their product, it is required that they have extensive
      knowledge of the following hardware;

Dell Confidential                      13
<PAGE>

      -     Dell Servers and PowerVault Storage Products

      -     Dell|EMC SAN environments, including switches, hubs and HBAs

      -     Other major vendor's tape backup products.

      LEVEL 1 SUPPORT means the services provided by a product trained Customer
      Support Engineer in response to an End User's initial notification of a
      suspected Problem. These services include, but may not be limited to, call
      logging, entitlement verification, and closing the matter with the End
      User after Problem Resolution. If escalation is required, all necessary
      information will be gathered. Upon completion of information gathering,
      escalation will occur to a Level 2 Support Engineer.

      LEVEL 2 SUPPORT means the services provided by one or more trained senior
      Customer Service Engineers ("CSEs") for detailed installation,
      configuration information, integration information, compatibility
      information, Problem isolation, troubleshooting, and determination of
      whether a Problem is reproducible, with the intent to resolve the End
      User's Problem. All resources including documentation, Knowledge Base
      and/or Patch matrix should be consulted before escalation to a Level 3
      Support engineer.

      LEVEL 3 SUPPORT means the services provided by one or more CommVault
      senior CSEs working in conjunction with development engineers to resolve
      Problems in the Software that cannot be resolved with Level 2 Support or
      are determined to be, or are highly probable to be, the result of a
      design, implementation or product defect. The problem may also be related
      to compatibility issues due to complex interaction between the Software
      and a third party vendor's product.

      When contacted for support by Dell, Supplier will respond according to the
      support collaboration targets and guidelines in Section 5.0 below. Both
      Dell and the Supplier will specify initial Technical Escalation Contacts
      in ATTACHMENT 1, which may be updated from time to time by mutual written
      agreement of the parties. Such written agreement may be in the form of
      electronic mail.

      4.1   TECHNICAL SUPPORT ENGAGEMENT

            To ensure a smooth transition during technical collaboration or
      escalation, it is essential that all parties remain engaged until the next
      level is fully engaged, including access to all relevant contact
      information and technical activity to date.

      4.2   SOLUTION DELIVERY

            [***].

      4.3   THIRD PARTY DEPENDENCY

            In the event that a Supplier is dependent upon a third party to
      provide support for a product or product component, it is incumbent upon
      the Supplier to establish an agreement with the third party, such that
      the Supplier is capable of meeting the expectations identified in this
      SLA by working through the 3rd party.

      4.4   UNRESOLVED SEVERITY 1 PROBLEMS (SOFTWARE)

            In the event of an unresolved Severity 1 problem for a
      customer or Dell, that has not been resolved within the `Resolution
      Target' timeframe defined below in Section 5.0, Supplier will [***].

5.0   SUPPORT COLLABORATION GUIDELINES AND RESOLUTION REQUIREMENTS

      This section describes the collaboration target times. These
      REQUIREMENTS ensure that additional resources are obtained in a
      consistent, timely manner. These requirements are intended to minimize
      customer impact and incident resolution time.

      The following chart indicates, by severity, the Technical
      Collaboration/incident resolution requirements Supplier must meet in
      addressing customer incidents (the "RESOLUTION REQUIREMENTS"):

Dell Confidential                      14
<PAGE>

RESOLUTION OF MUTUAL CUSTOMER CASES

      Each party shall endeavor to respond to and use commercially reasonable
      efforts to provide Case Remedies in a timely manner in accordance with the
      Priority Level identified in Exhibit C, and in accordance with that
      party's support or maintenance agreement with such Mutual Customer.

      Dell will use every effort available to resolve issues involving Dell
      hardware and VENDOR software. Partnership of Escalated issues

      In certain cases the customer may lack a clear understanding whether the
      issue lies with THE VENDOR or Dell. In cases such as these Dell or THE
      VENDOR will work jointly to resolve the issue. THE VENDOR and Dell will
      provide real-time experts to work until resolution to the escalated issue
      has been met. THE VENDOR and Dell are responsible for providing the
      following for all Sev 1 and Sev 1-A issues:

      1. [***].

      2. THE VENDOR will provide engineering contacts for Dell's Global Product
      Support Engineering team. Dell will also provide Engineering contacts to
      THE VENDOR for issues that involve Dell products under the same
      guidelines.( For long term sustaining issues). Requests from the customer
      for root cause analysis shall be completed within [***] by Dell and THE
      VENDOR

      3. Depending on Severity of issue THE VENDOR will move the escalated
      issues to the needed level. See table for timelines below.

<Table>
<Caption>
                        SEV 1-A        SEV 1          SEV 2        SEV 3
<S>                     <C>            <C>            <C>          <C>
THE VENDOR T1           [***]          [***]          [***]        [***]
THE VENDOR T2           [***]          [***]          [***]        [***]
THE VENDOR              [***]          [***]          [***]        [***]
Engineering
</Table>

      4. If the need arises for on-site assistance, both Dell and THE VENDOR
      will move experts on-site with a goal [***]. Due to the critical nature of
      these escalations Dell and THE VENDOR will work out any costs associated
      with these on-site visits on the backend. Need to determine what their
      hourly cost is

      5. Both Dell and the Vendor will provide single points of contacts on all
      Severity 1-A and 1 issues. Dell utilizes a Technical Account Manager as
      the single point of contact for areas involving severe escalations.

      6. Dell and the Vendor will provide a list of executive contacts that will
      be available [***] for engagement in escalations where process breakdowns
      are occurring.

      7. Executives, Managers and technical representatives from both companies
      will participate in joint conference calls with the customer during
      critical outages.

      8. Dell and the Vendor will meet via conference call on a quarterly basis
      to discuss performance on all escalated issues between the two companies.

      9. THE VENDOR and Dell will provide 7X24 original ownership on all Sev 1-A
      and Sev 1 issues (Sev 1 and Sev 1-A cases cannot be transferred to other
      regions until the issues has stabilized)

      5.1 STATUS UPDATES

               Dell requires STATUS updates from the Supplier based on incident
      severity. Unless otherwise agreed to, the schedule for status updates are
      as follows.

               Severity 1 = [***]
               Severity 2 = [***]
               Severity 3 a= [***]

      These are recommended feedback intervals. Updating of S1 incidents every
      [***] for customer review may inhibit the speed of resolution of the
      incident. Dell and Supplier may agree on an alternative update time, per
      incident.

      For all Incidents, status will include WHAT the next action will
      constitute and WHEN it will occur. If the next action is not delivered as
      committed, a new status will be sent, prior to the deadline to reset the
      expectations. Some additional clarification of roles/responsibilities is
      as follows:

            -     [***].

Dell Confidential                      15
<PAGE>

            -     [***].

            -     [***].

            -     [***]:

                  1.    [***], or

                  2.    [***], and

                  3.    [***].

            -     [***]

            -     See ATTACHMENT 1 for Management Escalation contact names and
                  telephone numbers for Dell and Supplier.

            5.2 NON-INCIDENT SPECIFIC ENGAGEMENT OF THE SUPPLIER

                  In some circumstances Dell may require engagement of the
            Supplier on issues other than a specific customer event. Supplier
            agrees to work with Dell in good faith to address issues including,
            but not limited to, Quality issues, Process improvements and
            Information requests.

6.0   SUPPORT MANAGEMENT ESCALATION (NOTIFICATION)

      6.1   ESCALATION CONDITIONS

            Conditions that require escalating the incident to a higher level of
      management include, but are not limited to, the following:

            6.1.1 Established timeframe exceeded (notification to management)

                  -     The agreed RESOLUTION REQUIREMENT time frame has passed

            6.1.2 Exceptional circumstances (management decision or action
                  required). Some examples:

                  -     Incident data is insufficient to start resolution

                  -     The promised resolution to customer time line has passed

                  -     The resolution resource is insufficient

                  -     The resolution does not resolve customer's problem

                  -     The resolution does not satisfy customer's requirements

7.0   SUPPORT RESOLUTION REQUIREMENTS PERFORMANCE

      Dell and the Supplier will monitor their own performance against the
      expected incident activity and resolution timeframes for each severity
      level of incident.

            Dell Performance Measures include without limitation:

                  -     Incoming incident rate (known/unknown solution)

                  -     Backlog

                  -     # Resolved within guidelines

                  -     Total Time to Solution Provided

                  -     # of transfers to Supplier

                  -     # of problem re-occurrences - Quality

            Supplier performance measures include without limitation:

                  -     Total # resolved within guidelines

                  -     # Rejected (incomplete info. or problem known)

                  -     Total Time to Problem Fix submitted

Dell Confidential                      16
<PAGE>

                  -     # of problem Re-occurrence - Quality

      7.1   SUPPORT EVALUATION

            Following commercial release by Dell of the Supplier's product, and
      no less frequently than twice per year, representatives from each party
      will meet to review the performance of, and recommend improvements
      regarding, the technical support provided by Supplier to Dell, and the
      technical support provided by Dell to its customers, under this Agreement.
      Either party can request a special meeting, or may call for a Root Cause
      Analysis and Closed Loop Corrective Action Plan in the event that such
      party has substantial concerns regarding a party's performance under this
      Schedule C or results are not meeting the service levels stated in
      SCHEDULE B to the Agreement (Quality Agreement).

8.0   SUPPORT TRAINING REQUIREMENTS

      8.1   CONTENT

            Supplier shall train a reasonable number of Dell technical support
      personnel (and Dell-authorized third party support team members, if
      applicable) at no additional expense to Dell. Supplier will provide this
      training at Dell's regional offices worldwide to set up, install,
      configure and operate the Supplier product (the "Initial Training"). This
      Initial Training is intended to provide information required to diagnose
      and resolve hardware or software issues. Supplier will provide an
      additional in-depth technical training class at mutually agreed upon times
      and locations.

      The Initial Training will cover (at a minimum) the following information
      related to the Dell version of the Supplier product design:

      o     Modular flow code walk-thru

      o     Engineering specifications

      o     New technology primer

      o     Error handling

      o     Trouble-shooting steps/procedures

      o     Diagnostic capability

      o     Delta's between the OEM or "Dell" version and retail version

      o     Basic product installation/re-installation procedures

      o     Driver installations/setup procedures

      o     Symptom-based Troubleshooting Tree/Process with isolation steps and
            recommended corrective actions

      o     Known issues list

      o     Disassembly/Reassembly procedures

      o     Product White Papers if available

      o     Technical Case Studies based on tech support calls seen by the
            Supplier

      8.2   TRAINING PLAN

            Supplier shall provide a written training plan to Dell not less than
      ninety (90) days prior to Dell's commercial introduction of the initial
      Supplier deliverables under this Agreement.

      At a minimum, the training plan will include:

      o     Recommended course outline and objectives to be approved by Dell

      o     Course timeline based on course outline

      o     Target audience and expected prerequisites

      o     Technical requirements for training environment

      o     Instructor resumes demonstrating working proficiency with the
            product, including working field experience

      o     Product FAQ's attachment

      o     Supplier product URLs available to the public

      o     List of the training deliverables

      o     Special equipment/tools required for Supplier training delivery

      o     List of all training contacts, including main point of contact

      8.3   TRAINING COURSEWARE

Dell Confidential                      17
<PAGE>

            Supplier shall provide a draft softcopy of all training courseware
      not less than sixty (60) days prior to Dell's commercial introduction of
      the initial Supplier Deliverables under this Agreement. Supplier shall
      provide hardcopy of any required training materials for each student at
      the time of training. Dell will retain the right to reproduce and
      distribute all training materials to Dell employees and Dell-authorized
      third party support team members.

      8.4   TRAINING DELIVERY

            Such training shall be completed not less than thirty (60) days
      prior to Dell's commercial introduction of the initial Supplier
      Deliverables under this Agreement. Additionally, training shall be
      provided within thirty (30) days prior to each new release, major revision
      and Update release at no expense to Dell at Dell's worldwide regional
      offices.

      8.5   TROUBLESHOOTING DOCUMENTATION

            Supplier shall provide softcopy documentation describing without
      limitation: (a) all known error codes and messages, (b) all known failure
      conditions and potential symptoms, (c) steps to take in isolating a
      failure to the proper root cause, and (d) recommended action(s) to
      correct.

      8.6   VIDEO PRESENTATION

            Supplier hereby authorizes Dell to videotape any of the training
      sessions to be performed by Supplier and hereby authorizes Dell to use
      such videotapes for any additional training of Dell personnel, Dell
      Resellers, Dell Subcontractors or Dell-authorized third party support team
      members during the term of this Agreement.

      8.7   SUBJECT MATTER EXPERT

            Supplier shall make reasonably available to Dell a subject matter
      expert who will be available to review modified Product Documentation
      and/or editing of videos regarding the Product(s) for technical and
      informational accuracy.

9.0   MUTUAL TRAVEL AGREEMENT

      Dell and Supplier agree to jointly travel on-site to a customer
      environment experiencing a problem that cannot be isolated or duplicated
      remotely, if customer circumstances so warrant. Each party agrees to
      initially bear its own costs that might arise in case of on-site travel.
      If the reported problem is determined to be attributable to causes other
      than Supplier's product(s), Dell will reimburse Supplier for its
      reasonable out-of-pocket expenses incurred in connection with such on-site
      support.

10.0  LICENSED PRODUCT USE FOR SUPPORT (SOFTWARE)

      Supplier will provide Dell royalty-free copies of all supported software
      products and documentation for the purpose of training and on-going
      support.

11.0  SUPPORT PROCESSES

      Both Dell and Supplier will document and maintain support contact detail,
      problem reporting and statusing procedures, management escalation
      contacts, problem resolution process flows and service level expectations
      in ATTACHMENT 1. Additionally, detail should be included in SCHEDULE B to
      the Agreement (Quality Agreement) that identifies problem-tracking
      systems, problem documentation requirements for incident creation, and
      problem support web sites available. This operational detail will be
      utilized by both parties to ensure an efficient and high quality support
      relationship for end customers.

12.0  CONTINUING SUPPORT AVAILABILITY (SOFTWARE)

      Supplier's technical support will be available to Dell for code-level
      issues on (a) all software releases, including all relevant software
      versions and updates available for sale and (b) for the immediate prior
      software release, including the most recent software version and update.
      Supplier's technical support will be available to Dell for critical
      problems at a minimum on the previous software release for the longer of
      (i) the period of Supplier's warranty to Dell, or (b) 12 months after
      current release is commercially available for sale to Dell customers.

13.0  SUPPORT SURVIVAL

      Termination of this Agreement regardless of the reason shall not relieve
      either party from its support obligations hereunder arising prior to such
      termination. Rights and obligations defined in this Schedule that by their
      nature should survive will remain in effect after termination or
      expiration of the Agreement. Supplier will continue to provide Support

Dell Confidential                      18
<PAGE>

      to Dell for no less than three (3) years after contract termination or
      expiration. Should the parties agree to terminate the Agreement, they will
      work together to develop a mutually agreeable plan to provide continued
      services to affected Dell customers.

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

Dell Confidential                      19<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                              4/26/04
<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                              4/26/04
<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                              4/26/04
<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                              4/26/04
<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                              4/26/04
<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                              4/26/04
<PAGE>
                                    EXHIBIT B
                               PRICING SUPPLEMENT
                        TO THE SOFTWARE LICENSE AGREEMENT
                           BETWEEN DELL PRODUCTS L.P.
                           AND COMMVAULT SYSTEMS INC.

<Table>
<Caption>
                                                                                                       DELL   1YR UPDATE  3YR UPDATE
SKU DESCRIPTION                                                      [***]  [***]   MSRP   DISCOUNT  SW COST  PROTECTION  PROTECTION
====================================================================================================================================
<S>                                                                  <C>    <C>    <C>     <C>       <C>      <C>         <C>
 CommServe                                                           [***]  [***]  $[***]    [***]   $ [***]  $    [***]  $    [***]
 [***]                                                               [***]  [***]  $[***]    [***]   $ [***]  $    [***]  $    [***]
 [***]                                                               [***]  [***]  $[***]    [***]   $ [***]  $    [***]  $    [***]
 [***]                                                               [***]  [***]  $[***]    [***]   $ [***]  $    [***]  $    [***]
 [***]                                                               [***]  [***]  $[***]    [***]   $ [***]  $    [***]  $    [***]
 [***]                                                               [***]  [***]  $[***]    [***]   $ [***]  $    [***]  $    [***]
 [***]                                                               [***]  [***]  $[***]    [***]   $ [***]  $    [***]  $    [***]
 [***]                                                               [***]  [***]  $[***]    [***]   $ [***]  $    [***]  $    [***]
 [***]                                                               [***]  [***]  $[***]    [***]   $ [***]  $    [***]  $    [***]
 [***]                                                               [***]  [***]  $[***]    [***]   $ [***]  $    [***]  $    [***]
 [***]                                                               [***]  [***]  $[***]    [***]   $ [***]  $    [***]  $    [***]
 [***]                                                               [***]  [***]  $[***]    [***]   $ [***]  $    [***]  $    [***]
 GalaxyExpress LAN Suite includes:                                   [***]  [***]  $[***]    [***]   $ [***]  $    [***]  $    [***]
     GalaxyExpress (key code upgrade to Galaxy)
     1 Windows, Storage Server2003, Linux or Novell MediaAgent included
     Includes support for up to 6 drive library for list of Dell supported drives/libraries
     3 FS Agents (can purchase more FS agents from list above) for Windows, UNIX, Linux or Novell
     1 Windows Application iDA (can purchase more Windows (only) APP agents from list above)
     Max 25 total clients (agents), no san spt + other Gexpress limitations

 [***]                                                                             $[***]    [***]   $ [***]  $    [***]  $    [***]
====================================================================================================================================
</Table>

Confidential                         Page 7                              4/26/04

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