Document:

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                                                                   Exhibit 10.14

                               PURCHASE AGREEMENT

                  THIS PURCHASE AGREEMENT (this "AGREEMENT"), dated April 14,
2000, is by and between Microsoft Corporation, a Washington corporation
("MICROSOFT"), and the other persons listed on the signature page hereto
(collectively with Microsoft, the "PURCHASERS"), and Comm Vault Systems, Inc., a
Delaware corporation (the "COMPANY").

                  WHEREAS, the Company and Microsoft are entering into an
arrangement whereby the Company may develop certain software for Microsoft and
Microsoft will invest in the Company;

                  WHEREAS, each of the other Purchasers desire to invest in the
Company; and

                  WHEREAS, the Company desires to issue and sell to the
Purchasers an aggregate of 4,361,555 shares of its Series AA Preferred Stock
(the "SHARES") and the Purchasers desire to purchase the Shares on the terms and
subject to the conditions described herein.

                  NOW, THEREFORE, in consideration of the premises and of the
mutual covenants, agreements and warranties herein contained, the parties hereto
agree as follows:

                  1. DEFINITIONS. Capitalized terms that are not defined in the
text of this Agreement have the meanings set forth below:

         "Affiliate" shall mean, with respect to any specified Person, any other
Person which, directly or indirectly, owns or controls, is under common
ownership or control with, or is owned or controlled by, such specified Person.
For purposes of this definition, a Person shall be deemed to control another
Person if the first Person owns or holds more than 50% of the voting power of
the second Person.

         "Amended Certificate" shall mean the Amended and Restated Certificate
of Incorporation of the Company in the form of Exhibit 2.

         "Board of Directors" shall mean the board of directors of the Company.

         "Engineering and Marketing Agreement" shall mean an Engineering and
Marketing Agreement to be entered into between Microsoft and Company as of the
Closing.

         "Governmental Authority" shall mean the government of the United States
or any foreign country or any state or political subdivision thereof and any
entity, body or authority exercising executive, legislative, judicial,
regulatory or administrative functions of or pertaining to government.

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         "Initial Public Offering" shall mean the initial public offering or
sale of common stock by the Company through underwriters or otherwise, that
requires registration, qualification or the filing of a prospectus under
applicable securities laws.

         "Knowledge" means the actual knowledge of N. Robert Hammer, Louis
Miceli, Larry Cormier or Al Bunte.

         "Law" shall mean any law, statute, regulation, ordinance, rule, order,
decree, judgment, consent decree, settlement agreement or governmental
requirement enacted, promulgated, entered into, agreed or imposed by any
Governmental Authority.

         "Lien" shall mean any mortgage, lien (except for any lien for taxes not
yet due and payable), charge, restriction, pledge, security interest, option,
lease or sublease, claim, right of any third party, easement, encroachment or
encumbrance.

         "Material Adverse Effect" shall mean an effect on the business,
operations, assets, liabilities, results of operations, cash flows or condition
(financial or otherwise) of the Company which is material and adverse.

         "Non-Preemptive Shares" shall mean any voting shares of the capital
stock of the Company issued, sold, granted or conveyed (i) in connection with
any acquisition of all or a portion of any Person or a merger or combination
with any Person duly authorized by the Board of Directors, (ii) to any current
or new director, officer, employee or consultant of the Company pursuant to any
plan or arrangement, now or hereafter existing, duly authorized by the Board of
Directors or (iii) pursuant to any of the items listed on Schedule B.

         "Person" shall mean any individual, corporation, proprietorship, firm,
partnership, limited partnership, trust, association or other entity.

         "Preferred Stock" shall mean the Company's issued and outstanding
Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock,
Series D Preferred Stock and Series E Preferred Stock.

         "Registration Rights Agreement" shall mean a Registration Rights
Agreement to be entered into between Purchasers and the Company as of the
Closing in the form of Exhibit 1.

         "Related Agreements" shall mean, (i) with respect to the Company and
Microsoft, the Engineering and Marketing Agreement, the Registration Rights
Agreements and the Warrant and (ii) with respect to the other Purchasers, only
the Registration Rights Agreement.

         "Securities Act" shall mean the Securities Act of 1933, as amended.

         "Stock Plan" shall mean the Company's stock plan, as described on
SCHEDULE B.

         "Subsidiaries" shall mean the Persons set forth on SCHEDULE A.

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         "Warrant" shall mean a warrant to be issued to Microsoft to purchase
shares of common stock of the Company in connection the conditions specified in
the Engineering and Marketing Agreement.

                  2. PURCHASE AND SALE OF SHARES.

         (a) PURCHASE PRICE. Subject to the terms and conditions set forth in
this Agreement, at the Closing (as hereinafter defined), the Purchasers shall
purchase, and the Company shall issue and sell to the Purchasers the Shares for
an aggregate purchase price (the "Purchase Price") of $25,000,002. The number of
Shares being sold to each Purchaser and the portion of the Purchase Price
attributable thereto is set forth under such Purchaser's name on the signature
page hereto.

         (b) CLOSING. The closing (the "Closing") of the transactions described
herein shall occur on April 14, 2000, or such other date as agreed upon by the
Purchasers and the Company. At the Closing, the Purchasers shall pay the Company
the Purchase Price in cash by wire transfer of immediately available funds to an
account designated by the Company at least three business days before the
Closing and the Company shall deliver to each Purchaser a certificate
representing the Shares purchased by such Purchaser.

                  3. REPRESENTATIONS AND WARRANTIES OF THE COMPANY. The Company
hereby represents and warrants to each of the Purchasers:

         (a) DUE INCORPORATION; SUBSIDIARIES. Each of the Company and the
Subsidiaries is duly incorporated, validly existing and in good standing under
the laws of its jurisdiction of incorporation, with all requisite power and
authority to own, lease and operate its properties and to carry on its business
as they are now being owned, leased, operated and conducted. Each of the Company
and the Subsidiaries is licensed or qualified to do business and is in good
standing as a foreign corporation in each jurisdiction where the nature of the
properties owned, leased or operated by it and the businesses transacted by it
require such licensing or qualification, except where the failure to be so
licensed or qualified would not individually or in the aggregate have a Material
Adverse Effect. Except as set forth on SCHEDULE A, the Company has no direct or
indirect subsidiaries, either wholly or partially owned, and the Company does
not hold any direct or indirect economic, voting or management interest in any
Person or directly or indirectly own any security issued by any Person. Each
Subsidiary is wholly owned by the Company.

         (b) DUE AUTHORIZATION. The Company has full power and authority to
enter into this Agreement and its Related Agreements and to consummate the
transactions contemplated hereby and thereby. The execution, delivery and
performance by the Company of this Agreement and its Related Agreements have
been duly and validly approved by the board of directors of the Company and no
other actions or proceedings on the part of the Company are necessary to
authorize this Agreement, the Related Agreements and the transactions
contemplated hereby and thereby. The Company has duly and validly executed and
delivered this Agreement and has duly and validly executed and delivered (or
prior to or at the Closing will duly and validly execute and deliver) its
Related Agreements. This Agreement constitutes legal, valid and binding
obligations of the Company and the Company's Related Agreements upon execution
and delivery by the Company will constitute legal, valid and binding obligations
of the Company, in

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each case, enforceable in accordance with their respective terms, except as such
enforceability may be limited by applicable bankruptcy, insolvency, moratorium,
reorganization or similar laws in effect which affect the enforcement of
creditors' rights generally and by equitable limitations on the availability of
specific remedies.

         (c) CONSENTS AND APPROVALS; AUTHORITY RELATIVE TO THIS AGREEMENT.

                  (i) No consent, authorization or approval of, filing or
registration with, or cooperation from, any Governmental Authority or any other
Person not a party to this Agreement that has not been received by the Company
is necessary in connection with the execution, delivery and performance by the
Company of this Agreement and the execution, delivery and performance by the
Company of Related Agreements or the consummation of the transactions
contemplated hereby or thereby.

                  (ii) The execution, delivery and performance by Company of
this Agreement and its Related Agreements do not and will not (1) violate any
Law; (2) violate or conflict with, result in a breach or termination of,
constitute a default or give any third party any additional right (including a
termination right) under, permit cancellation of, result in the creation of any
Lien upon any of the assets or properties of the Company under, or result in or
constitute a circumstance which, with or without notice or lapse of time or
both, would constitute any of the foregoing under, any contract to which the
Company, is a party or by which the Company or any of its assets or properties
are bound; (3) permit the acceleration of the maturity of any indebtedness of
the Company or indebtedness secured by its assets or properties; or (4) violate
or conflict with any provision of any of the Certificate of Incorporation,
charter or by-laws of the Company.

         (d) CAPITALIZATION.

                  (i) The authorized capital stock of the Company is as
described in the Amended Certificate. All of the outstanding capital stock of
the Company and each Subsidiary (i) is validly issued, fully paid and
nonassessable and (ii) is free of preemptive rights (except as provided in the
Amended Certificate or this Agreement). When issued, the Shares, the Conversion
Shares and the Warrant Shares will be validly issued, fully paid and
nonassessable.

                  (ii) Except as set forth above or on SCHEDULE B, there are no
shares of capital stock or other securities (whether or not such securities have
voting rights) of the Company issued or outstanding or any subscriptions,
options, warrants, calls, rights, convertible securities or other agreements or
commitments of any character obligating the Company to issue, transfer or sell,
or cause the issuance, transfer or sale of, any shares of its capital stock or
other securities (whether or not such securities have voting rights). Except as
set forth in SCHEDULE B, there are no outstanding contractual obligations of the
Company which relate to the purchase, sale, issuance, repurchase, redemption,
acquisition, transfer, disposition, holding or voting of any shares of its
capital stock or other securities.

         (e) LITIGATION.

                  (i) There is no claim, action, suit, investigation or
proceeding ("Litigation") pending or, to the Knowledge of the Company,
threatened against the Company or any

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Subsidiary, or involving any of its properties or assets by or before any court,
arbitrator or other Governmental Entity which (1) in any manner challenges or
seeks to prevent, enjoin, alter or materially delay the transactions
contemplated by this Agreement or (2) if resolved adversely to the Company or
any Subsidiary, would reasonably be expected to have a Material Adverse Effect.

                  (ii) Neither the Company nor any Subsidiary is in default
under or in breach of any order, judgment or decree of any court, arbitrator or
other Governmental Authority, except for defaults or breaches, which
individually or in the aggregate would not reasonably be expected to have a
Material Adverse Effect.

         (f) COMPLIANCE WITH LAWS. The Company and each Subsidiary are in
compliance in all material respects with allapplicable Laws.

         (g) OFFERING OF SHARES. Neither the Company nor any Person acting on
its behalf has taken or will take any action (including, without limitation, any
offering of any securities of the Company under circumstances which would
require, under the Securities Act, the integration of such offering with the
offering and sale of the Shares) which might reasonably be expected to subject
the offering, issuance or sale of the Shares to the registration requirements of
the Securities Act.

         (h) BROKERS. No broker, finder or investment banker is entitled to any
brokerage, finder's or other fee or commission from any party in connection with
the transactions contemplated by this Agreement based upon arrangements made by
or on behalf of the Company.

                  4. REPRESENTATIONS AND WARRANTIES OF PURCHASERS. Each of the
Purchasers severally but not jointly hereby represents and warrants to the
Company as follows:

         (a) DUE INCORPORATION. Each Purchaser that is not an individual is duly
organized, validly existing and in good standing under the laws of its
jurisdiction of organization, with all requisite power and authority to own,
lease and operate its properties and to carry on its business as they are now
being owned, leased, operated and conducted.

         (b) DUE AUTHORIZATION. Each Purchaser that is not an individual has
full power and authority to enter into this Agreement and its Related Agreements
and to consummate the transactions contemplated hereby and thereby. The
execution, delivery and performance by such Purchaser of this Agreement and its
Related Agreements have been duly and validly approved by its governing body
empowered to authorize the transactions contemplated by this Agreement and its
Related Agreements and no other actions or proceedings on the part of such
Purchaser are necessary to authorize this Agreement, its Related Agreements and
the transactions contemplated hereby and thereby.

         (c) DUE EXECUTION; BINDING EFFECT. Such Purchaser has validly executed
and delivered this Agreement and has duly and validly executed and delivered (or
prior to or at the Closing will duly and validly execute and deliver) its
Related Agreements. This Agreement constitutes legal, valid and binding
obligations of such Purchaser and such Purchaser's Related Agreements upon
execution and delivery by such Purchaser (as applicable) will constitute legal,

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valid and binding obligations of such Purchaser, in each case, enforceable in
accordance with their respective terms, except as such enforceability may be
limited by applicable bankruptcy, insolvency, moratorium, reorganization or
similar laws in effect which affect the enforcement of creditors' rights
generally and by equitable limitations on the availability of specific remedies.

         (d) CONSENTS AND APPROVALS; AUTHORITY RELATIVE TO THIS AGREEMENT.

                  (i) No consent, authorization or approval of, filing or
registration with, or cooperation from, any Governmental Authority or any other
Person not a party to this Agreement is necessary in connection with the
execution, delivery and performance by such Purchaser of this Agreement and its
Related Agreements and the consummation of the transactions contemplated hereby
and thereby.

                  (ii) The execution, delivery and performance by such Purchaser
of this Agreement and its Related Agreements do not and will not (1) violate any
Law; (2) violate or conflict with, result in a breach or termination of,
constitute a default or give any third party any additional right (including a
termination right) under, permit cancellation of, result in the creation of any
Lien upon any of the assets or properties of such Purchaser under, or result in
or constitute a circumstance which, with or without notice or lapse of time or
both, would constitute any of the foregoing under, any contract to which
Purchaser is a party or by which such Purchaser or any of its assets or
properties are bound; (3) permit the acceleration of the maturity of any
indebtedness of such Purchaser or indebtedness secured by its assets or
properties; or (4) for each Purchaser that is not an individual, violate or
conflict with any provision of such Purchaser's organizational documents.

         (e) BROKERS. No broker, lender or investment banker is entitled to any
brokerage, lender's or other fee or commission from any party in connection with
the transactions contemplated by this Agreement based on arrangements made by or
on behalf of such Purchaser.

         (f) PURCHASE FOR INVESTMENT. Such Purchaser is purchasing the Shares
hereunder for investment without any intent of the distribution thereof within
the meaning of the Securities Act.

         (g) ACCREDITED INVESTOR. Such Purchaser is an "accredited investor"
within the meaning of Regulation 501(a) under the Securities Act and is able to
bear the economic risk of acquisition of the Shares, can afford to sustain a
total loss on such investment, and has such knowledge and experience in
financial and business matters that it is capable of evaluating the merits and
risk of the proposed investment. Such Purchaser has been furnished the
opportunity to ask questions of and receive answers from representatives of the
Company concerning the business and financial affairs of the Company.

                  5. COVENANTS.

         (a) CONDUCT OF BUSINESS BY THE COMPANY PENDING THE CLOSING. The Company
shall, and shall cause each of its Subsidiaries to, during the period from the
date of this Agreement and continuing until the earlier of the termination of
this Agreement or the Closing, unless the Purchasers otherwise agree in writing,
(1) conduct its business only in the ordinary course and

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consistent with past practice; (2) maintain its books and records in the usual,
regular and ordinary manner, on a basis consistent with past practice; and (3)
comply in all material respects with applicable Laws. Except as expressly
contemplated by this Agreement between the date of this Agreement and the
Closing, the Company shall not do any of the following without the prior written
consent of the Purchasers, which consent shall not be unreasonably withheld or
delayed:

                  (i) change any of its methods of accounting or accounting
practice, other than such changes required by GAAP;

                  (ii) (1) repurchase, redeem or otherwise acquire or exchange
any share of its common stock or other equity interests; (2) except for
issuances of its common stock pursuant to the exercise of options to purchase
common stock outstanding on the date hereof pursuant to any of the arrangements
listed on SCHEDULE B or an increase determined in good faith by the Company in
the amount of common stock to be issued under the Stock Plan, issue or sell any
additional shares of the capital stock of, or other equity interests in, the
Company, or securities convertible into or exchangeable for such shares or other
equity interests, or issue or grant any subscription rights, options, warrants
or other rights of any character relating to shares of such capital stock, such
other equity interests or such securities; or (3) declare, set aside, make or
pay any dividend, or make any distribution, in respect of any of its shares of
capital stock other than as required with respect to the Preferred Stock;

                  (iii) amend its charter or by-laws or other organizational
documents except with respect to the filing of the Amended Certificate;

                  (iv) take any action that is reasonably likely to result in
any of the representations and warranties set forth in Section 3 becoming false
or inaccurate in any material respect as of the Closing; or

                  (v) agree to take any of the actions restricted by this
Section 5(a).

         (b) BOARD REPRESENTATION; OBSERVERS. Microsoft shall be entitled to
designate for election to the Board of Directors one director (the "MICROSOFT
DIRECTOR") and, in addition, designate one non-voting observer (the "NON-VOTING
OBSERVER") to attend and participate in (but not vote at) all meetings of the
Board of Directors. The Company will take all action necessary for the Microsoft
Director to be elected to the Board of Directors as of the Closing. In
connection with any annual meeting of stockholders of the Company at which the
term of the Microsoft Director is to expire, the Company will take all necessary
action to cause the Microsoft Director to be nominated and use its reasonable
best efforts to cause the Microsoft Director to be elected to the Board of
Directors. In the event a vacancy shall exist in the office of the Microsoft
Director, Microsoft shall be entitled to designate a successor and the Board of
Directors shall elect such successor and, in connection with the meeting of
stockholders of the Company next following such election, nominate such
successor for election as director by the stockholders and use its reasonable
best efforts to cause the successor to be elected. The Non-Voting Observer shall
have the same access to information concerning the business and operations of
the Company and at the same time as the directors of the Company, and shall be
entitled to participate in discussions and consult with the Board of Directors
without voting. The provision of any such information to the Non-Voting Observer
shall be subject to the receipt by

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the Company of a confidentiality agreement covering such information and
reasonably acceptable to the Company and the Non-Voting Observer. Microsoft's
right to nominate the Microsoft Director and the Non-Voting Observer and the
Company's obligation to take any action to cause the Microsoft Director to be
elected to the Board of Director shall terminate as of the Initial Public
Offering. In addition, the term of the Microsoft Director and all rights of the
Microsoft Director and the Non-Voting Observer, including the rights to observe
the books and records of the Company as provided above, shall expire as of such
time. Microsoft agrees that the information provided by the Company, officers,
directors and employees pursuant to this Section 5(b) will be used solely for
the purpose of evaluating Microsoft's investment in the Shares, the Conversion
Shares and the Warrant Shares, and that such information will be kept strictly
confidential by Microsoft; PROVIDED that the foregoing obligation of Microsoft
shall not (a) relate to any information that (i) is or becomes generally
available other than as a result of unauthorized disclosure by Microsoft or by
persons to whom Microsoft has made such information available or (ii) is or
becomes available to Microsoft on a non-confidential basis from a third party
that is not, to Microsoft's knowledge, bound by any other confidentiality
agreement with the Company or its subsidiaries, or (b) prohibit disclosure of
any information if required by Law or the rules of any stock exchange. Microsoft
hereby acknowledges that it is aware that the United States securities laws
prohibit any person who has received from an issuer or any Affiliate thereof any
material, non-public information from purchasing or selling securities of such
issuer or from communicating such information to any other person under
circumstances in which it is reasonably foreseeable that such person is likely
to purchase or sell such securities. Microsoft acknowledges and agrees that
there would be no adequate remedy at Law if Microsoft fails to perform its
obligations under this Section 5(b) and accordingly agrees that the Company, in
addition to any other remedy to which it may be entitled at Law or in equity,
shall be entitled to compel specific performance of the obligations of Microsoft
under this Section 5(b).

         (c) AMENDED CERTIFICATE. The Company shall, prior to or concurrently
with the Closing, cause the Amended Certificate to be filed with the Secretary
of State of the State of Delaware.

         (d) COOPERATION. Each of the Purchasers and the Company agrees to use
its reasonable best efforts to take, or cause to be taken, all such further
actions as shall be necessary to make effective and consummate the transactions
contemplated by this Agreement.

         (e) RESERVE SHARES. The Company will at all times reserve and keep
available, solely for issuance and delivery upon conversion of the Shares, the
number of shares of common stock from time to time issuable upon conversion of
all Shares at the time outstanding (the "CONVERSION SHARES") and any shares to
be issued pursuant to the Warrant (the "WARRANT SHARES"). All Conversion Shares
and Warrant Shares shall be duly authorized and, when issued upon such
conversion or exercise, shall be validly issued, fully paid and nonassessable.

         (f) RESTRICTIONS ON TRANSFER. The Purchasers will not, prior to the
earlier of (a) December 31, 2004 or (b) the time of the closing of the Initial
Public Offering, sell, transfer, assign, convey, gift, mortgage, pledge,
encumber, hypothecate, or otherwise dispose of, directly or indirectly,
("TRANSFER") any of the Shares or any Conversion Shares except for (i) Transfers
between and among the Purchasers and their Affiliates provided such Transfer is
in accordance

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with the transfer restrictions applicable to the Shares or the Conversion Shares
under federal and state securities laws and the Affiliate transferee agrees to
be bound by the restrictions applicable to such Shares or Conversion Shares,
including without limitation the agreements set forth in this Section 5(f), and
(ii) Transfers (x) pursuant to a bona fide tender or exchange offer made
pursuant to a merger or other agreement approved by the Board of Directors to
acquire securities of the Company; provided, that the Purchasers may not tender
or exchange in such offer unless at least 50% of the outstanding voting
securities of the Company have previously been tendered or exchanged by other
holders of the Company's securities in connection therewith, (y) pursuant to any
cash merger, or other business combination transaction to which the Company is a
party or involved in which the common stock of the Company's stockholders is
exchanged for cash upon consummation of such merger or other business
combination or (z) agreed to in writing by the Company. Notwithstanding any
other provision of this Section 5(f), no Purchaser shall avoid the provisions of
this Section 5(f) by making one or more transfers to one or more Affiliates and
then disposing of all or any portion of such Purchaser's interest in any such
Affiliate.

         (g) PREEMPTIVE RIGHT. If at any time the Company desires to issue or
sell any shares (the "ADDITIONAL SHARES") of its capital stock that entitle the
holder thereof to voting rights (other than Non-Preemptive Shares) to any
Person, the Company shall give a written notice (the "ISSUANCE NOTICE") to the
Purchasers setting forth the proposed terms of such Additional Shares and the
quantity of Additional Shares to be issued, the issuance date and the price at
which such Additional Shares shall be issued. Each of the Purchasers shall have
the option to purchase the number of Additional Shares necessary to maintain
such Purchaser's percentage of issued and outstanding voting shares of the
Company at the time of the Issuance Notice, which option may be exercised by
giving written notice to the Company (the "RESPONSE NOTICE") within 14 days of
the Issuance Notice that contains an unconditional agreement to purchase all
(and not less than all) of the Additional Shares to which such Purchaser is
entitled to purchase. Failure by a Purchaser to give the Response Notice to the
Company within such 14-day period shall be deemed to be a rejection of such
option. At the option of the Company, within 14 days of Company's receipt of the
Response Notice or at the time of the closing of the sale of Additional Shares
to any Persons pursuant to the next sentence, the Company shall sell to such
Purchaser and such Purchaser shall purchase the Additional Shares that such
Purchaser agreed to purchase in the Response Notice, at the price and on the
terms set forth in the Issuance Notice. For a period of 270 days after any
Issuance Notice, the Company shall have the right to issue or sell to any Person
up to the number of Additional Shares specified in the Issuance Notice less the
number of Additional Shares pursuant to duly tendered Response Notices at a
price and on terms not materially less favorable to the Company than as
specified in the Issuance Notice. If the Company desires to issue or sell
Additional Shares, (i) after such 270-day period, (ii) on terms materially less
favorable to the Company than as specified in the Issuance Notice or (iii) in a
quantity greater than as specified in the previous sentence, the Company must
again comply with this Section 5(g). The rights and obligations of the parties
pursuant to this Section 5(g) shall terminate upon the closing of an Initial
Public Offering.

         (h) COMPLIANCE WITH SECURITIES LAWS. Such Purchaser understands that
the Shares, the Conversion Shares and the Warrant Shares will not be registered
under the Securities Act or applicable state securities laws and agrees not to
sell, pledge or otherwise transfer any of the Shares, Conversion Shares and the
Warrant Shares in the absence of such registration or an opinion of counsel
reasonably satisfactory to the Company that such registration is not required.

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Except as set forth in the Registration Rights Agreement, such Purchaser
acknowledges that the Company is not required to register the Shares, the
Conversion Shares or the Warrant Shares.

                  6. CONDITIONS.

         (a) CONDITIONS TO OBLIGATIONS OF THE PURCHASERS. The obligations of the
Purchasers to consummate the transactions contemplated hereby shall be subject
to the satisfaction or waiver at or prior to the Closing of each of the
following conditions:

                  (i) No statute, rule or regulation or order of any court or
administrative agency shall be in effect which prohibits the consummation of the
transactions contemplated hereby;

                  (ii) Each of the representations and warranties of the Company
contained in this Agreement shall be true and correct when made and as of the
Closing (except to the extent such representations and warranties are made as of
a particular date, in which case such representations and warranties shall have
been true and correct in all material respects as of such date), except for
failures to be true and correct which individually or in the aggregate would not
reasonably be expected to have a Material Adverse Effect;

                  (iii) The Company shall have performed, satisfied and complied
in all material respects with all of its covenants and agreements set forth in
this Agreement to be performed, satisfied and complied with prior to or at the
Closing;

                  (iv) The Company shall have delivered to the Purchasers an
officer's certificate certifying as to the Company's compliance with the
conditions set forth in clauses (ii) and (iii) of this Section 6(a);

                  (v) The Company shall have executed and delivered to each of
the Purchasers the Registration Rights Agreement;

                  (vi) The Amended Certificate shall have been duly filed with
the Secretary of State of the State of Delaware in accordance with the laws of
the State of Delaware and the Amended Certificate shall be in full force and
effect;

                  (vii) The Company shall have executed and delivered to
Microsoft the Engineering and Marketing Agreement;

                  (viii) The Company shall have executed and delivered to
Microsoft the Warrant;

                  (ix) The Conversion Shares and the Warrant Shares shall have
been duly authorized and reserved for issuance;

                  (x) Mayer, Brown & Platt shall have delivered an opinion in
form and substance reasonably satisfactory to Purchasers; and

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                  (xi) There shall not have occurred any event, circumstances,
condition, fact, effect, or other matter which has had or would reasonably be
expected to have a Material Adverse Effect.

         (b) CONDITIONS TO OBLIGATIONS OF THE COMPANY. The obligations of the
Company to consummate the transactions contemplated hereby shall be subject to
the satisfaction or waiver at or prior to the Closing of each of the following
conditions:

                  (i) No statute, rule or regulation or order of any court or
administrative agency shall be in effect which prohibits the consummation of the
transactions contemplated hereby;

                  (ii) Each of the representations and warranties of the
Purchasers contained in this Agreement shall be true and correct when made and
as of the Closing (except to the extent such representations and warranties are
made as of a particular date, in which case such representations and warranties
shall have been true and correct in all material respects as of such date),
except for failures to be true and correct which individually or in the
aggregate would not reasonably be expected to have a material adverse effect on
the Purchasers' ability to perform its obligations under this Agreement;

                  (iii) Each of the Purchasers shall have executed and delivered
to the Company its Related Agreements;

                  (iv) The Purchasers shall have performed, satisfied and
complied in all material respects with all of their covenants and agreements set
forth in this Agreement to be performed, satisfied and complied with prior to or
at the Closing Date; and

                  (v) Each of Purchasers shall have delivered to the Company a
certificate certifying as to his compliance with the conditions set forth in
clauses (ii) and (iii) of this Section 6(b).

                  7. TERMINATION. This Agreement shall be terminable:

                  (i) by the parties upon mutual written agreement;

                  (ii) by the Company, on one hand, and the Purchasers, on the
other hand, if the other party materially breaches any covenant, representation
or warranty contained herein, upon written notice to such breaching party; and

                  (iii) by the Company, on one hand, and the Purchasers, on the
other hand, if any condition precedent to any party's obligation to proceed with
the Closing is not satisfied by May 31, 2000, upon written notice to the other
party (provided that the right to terminate this Agreement shall not be
available to any party whose failure to fulfill any obligation under this
agreement had been the cause of or resulted in the failure of the Closing to
occur before such date).

Upon termination of this Agreement, all obligations of each party hereunder
shall terminate except those obligations pursuant to Sections 13, 19, 20, 21 and
22. Neither party shall have any

<PAGE>

liability to the other party upon a termination of this Agreement, unless such
termination arises under clause (ii) above.

                  8. SURVIVAL OF REPRESENTATIONS AND WARRANTIES.

         The representations and warranties of the parties contained in this
Agreement shall expire on the 18-month anniversary of the Closing. After the
expiration of such period, any claim by a party based upon any such
representation or warranty shall be of no further force and effect, except to
the extent a party has given notice to the other party of a claim for breach of
any such representation or warranty prior to the expiration of such period, in
which event any representation or warranty to which such claim relates shall
survive with respect to such claim until such claim is resolved as provided in
this Section 8. The covenants and agreements of the parties hereto contained in
this Agreement shall survive the Closing until performed in accordance with
their terms.

                  9. RESTRICTIVE LEGENDS. In addition to the restrictions set
forth in Section 5(f), no Shares, Conversion Shares or Warrant Shares may be
transferred without registration under the Securities Act and applicable state
securities laws unless counsel acceptable to the Company shall advise the
Company that such transfer may be effected without such registration. Each
certificate representing any of the foregoing shall bear legends in
substantially the following form:

         THE SECURITIES EVIDENCED BY THIS CERTIFICATE SHALL BE CONVERTIBLE INTO
         THE COMPANY'S COMMON STOCK IN THE MANNER AND ACCORDING TO THE TERMS SET
         FORTH IN THE CERTIFICATE OF INCORPORATION. THE COMPANY IS AUTHORIZED TO
         ISSUE MORE THAN ONE CLASS OR SERIES OF STOCK. AS REQUIRED UNDER
         DELAWARE LAW, THE COMPANY SHALL FURNISH TO ANY HOLDER UPON REQUEST AND
         WITHOUT CHARGE, A FULL SUMMARY STATEMENT OF THE DESIGNATIONS, VOTING
         RIGHTS, PREFERENCES, LIMITATIONS AND SPECIAL RIGHTS OF THE SHARES OF
         EACH CLASS OR SERIES AUTHORIZED TO BE ISSUED BY THE COMPANY SO FAR AS
         THEY HAVE BEEN FIXED AND DETERMINED AND THE AUTHORITY OF THE BOARD OF
         DIRECTORS TO FIX AND DETERMINE THE DESIGNATIONS, VOTING RIGHTS,
         PREFERENCES, LIMITATIONS AND SPECIAL RIGHTS OF THE CLASSES AND SERIES
         OF SECURITIES OF THE COMPANY.

         THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
         UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "1933 ACT"), OR UNDER
         ANY APPLICABLE STATE LAWS. THE SHARES REPRESENTED BY THIS CERTIFICATE
         HAVE BEEN ACQUIRED BY THE REGISTERED OWNER HEREOF FOR INVESTMENT AND
         NOT WITH A VIEW TO OR FOR SALE IN CONNECTION WITH ANY DISTRIBUTION
         THEREOF WITHIN THE MEANING OF THE 1933 ACT. THE SHARES MAY NOT BE SOLD,
         PLEDGED, TRANSFERRED OR ASSIGNED EXCEPT IN A TRANSACTION WHICH IS
         EXEMPT UNDER

<PAGE>

         THE PROVISIONS OF THE 1933 ACT OR ANY APPLICABLE STATE SECURITIES LAWS,
         OR PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT OR IN A TRANSACTION
         OTHERWISE IN COMPLIANCE WITH APPLICABLE FEDERAL AND STATE SECURITIES
         LAWS.

         THE SALE, PLEDGE, TRANSFER, ASSIGNMENT OR OTHER DISPOSITION OF THE
         SHARES REPRESENTED BY THIS CERTIFICATE IS RESTRICTED BY AND SUBJECT TO
         THE PROVISIONS OF A PURCHASE AGREEMENT DATED AS OF APRIL 14, 2000, A
         COPY OF WHICH IS AVAILABLE UPON REQUEST FOR INSPECTION AT THE OFFICE'S
         OF THE COMPANY. ANY SUCH REQUEST SHOULD BE ADDRESSED TO THE SECRETARY
         OF THE COMPANY.

                  10. SUCCESSORS AND ASSIGNS; NO THIRD PARTY BENEFICIARIES. This
Agreement shall bind and inure to the benefit of the Company and the Purchasers
and the respective successors, permitted assigns, heirs and personal
representatives of the Company and the Purchasers; PROVIDED that the Company may
not assign its rights or obligations under this Agreement to any Person without
the prior written consent of the Purchasers, and provided further that the
Purchasers may not assign their rights or obligations under this Agreement to
any Person (other than an Affiliate) without the prior written consent of the
Company. This Agreement is intended for the benefit of the parties hereto and
their respective permitted successors and assigns, and is not for the benefit
of, nor may any provision hereof be enforced by, any other person.

                  11. NOTICES. Each notice, demand, request, request for
approval, consent, approval, disapproval, designation or other communication
(each of the foregoing being referred to herein as a notice) required or desired
to be given or made under this Agreement shall be in writing (except as
otherwise provided in this Agreement), and shall be effective and deemed to have
been received (i) when delivered in person, (ii) when sent by fax with receipt
acknowledged, (iii) five days after having been mailed by certified or
registered United States mail, postage prepaid, return receipt requested, or
(iv) the next business day after having been sent by a nationally recognized
overnight mail or courier service, receipt requested. Notices shall be addressed
as set forth below:

         If to Microsoft:

                  Microsoft Corporation
                  One Microsoft Way
                  Redmond, Washington 98502
                  Attn: Chief Financial Officer
                  Facsimile: (425) 936-7329
                  with a copy to: Law and Corporate Affairs
                  Facsimile: (425) 936-7329

         If to any of the other Purchasers, at the address set forth under his
         name on the signature page.

         With a copy to:

<PAGE>

                  Preston, Gates & Ellis
                  701 5th Avenue, Suite 5000
                  Seattle, Washington 98104
                  Attn: Richard B. Dodd
                  Facsimile: (206) 623-7022

         If to the Company:

                  CommVault Systems, Inc.
                  2 Crescent Place
                  Oceanport, New Jersey 07757
                  Attn: N. Robert Hammer
                  Facsimile: (732) 870-4514

         With a copy to:

                  Mayer, Brown & Platt
                  190 S. LaSalle Street
                  Chicago, Illinois 60603
                  Attention: Philip J. Niehoff
                  Facsimile: (312) 701-7711

                  12. FURTHER ASSURANCES. At any time or from time to time after
the Closing, the Company, on the one hand, and the Purchasers, on the other
hand, agree to cooperate with each other, and at the request of the other party,
to execute and deliver any further instruments or documents and to take all such
further action as the other party may reasonably request in order to evidence or
effectuate the consummation of the transactions contemplated hereby and to
otherwise carry out the intent of the parties hereunder.

                  13. PUBLIC DISCLOSURE. Except as required by Law or the rules
of any stock exchange, no public announcement or other publicity regarding the
transactions referred to herein shall be made by any of the Purchasers or the
Company or any of their respective Affiliates, officers, directors, employees,
representatives or agents, without the prior written agreement of Purchasers and
Company, in any case, as to form, content, timing and manner of distribution or
publication; provided, however, that nothing in this Section shall prevent such
parties from (i) discussing such transactions with those Persons whose approval,
agreement or opinion, as the case may be, is required for consummation of such
particular transaction or transactions or (ii) disclosing such information about
such transactions in a registration statement or prospectus in connection with
the Initial Public Offering. Each of the parties acknowledge and agree that
there would be no adequate remedy at Law if it fails to perform its obligations
under this Section 13 and accordingly agrees that each of the other parties, in
addition to any other remedy to which it may be entitled at Law or in equity,
shall be entitled to compel specific performance of the obligations of the first
party under this Section 13.

                  14. WAIVER. No party may waive any of the terms or conditions
of this Agreement except by a duly signed writing referring to the specific
provision to be waived.

<PAGE>

                  15. ENTIRE AGREEMENT. This Agreement and the Related
Agreements constitute the entire agreement, and supersedes all other prior
agreements and understandings, both written and oral, among the parties hereto
and their affiliates with respect to the matters set forth herein.

                  16. SEVERABILITY. If any provision of this Agreement shall be
held invalid, illegal or unenforceable, the validity, legality or enforceability
of the other provisions hereof shall not be affected thereby, and there shall be
deemed substituted for the provision at issue a valid, legal and enforceable
provision as similar as possible to the provision at issue.

                  17. CAPTIONS. The Section references herein are for
convenience of reference only, do not constitute part of this Agreement and
shall not be deemed to limit or otherwise affect any of the provisions hereof.

                  18. COUNTERPARTS. This Agreement may be executed in one or
more counterparts, each of which shall be deemed an original but all of which
shall constitute one and the same instrument.

                  19. GOVERNING LAW. This Agreement shall be governed by, and
construed and enforced in accordance with, the laws of the State of Delaware.

                  20. [INTENTIONALLY OMITTED]

                  21. WAIVER OF JURY TRIAL. THE COMPANY AND THE PURCHASERS
HEREBY WAIVE ANY RIGHT THEY MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY
ACTION, PROCEEDING OR LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF, UNDER OR
IN CONNECTION WITH THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED THEREBY.

                  22. FEES AND EXPENSES. All costs and expenses incurred in
connection with this Agreement shall be paid by the party incurring such costs
or expense.

                  23. JOINT PARTICIPATION IN DRAFTING. Each party to this
Agreement has participated in the negotiation and drafting of this Agreement. As
such, the language used herein shall be deemed to be the language chosen by the
parties hereto to express their mutual intent, and no rule of strict
construction will be applied against any party to this Agreement.

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed and delivered as of the day and year first written above.

                            MICROSOFT CORPORATION

                            By: /S/ ILLEGIBLE
                               ---------------------------------------
                            Name:
                                 -------------------------------------
                            Title:
                                  ------------------------------------
                            Shares: 2,616,933
                                   -----------------------------------
                            Purchase Price: $15,000,000

                            /S/ GREG REYES
                            ------------------------------------------
                            GREG REYES
                            1901 Guadelupe Parkway
                            San Jose, CA 95131
                            Shares:  87,321
                                   -----------------------------------
                            Purchase Price: 500,000
                                            --------------------------

<PAGE>

                            THE VAN WAGONER FUNDS

                            By: /S/ GARRETT R. VAN WAGONER
                                --------------------------------------
                            Name: GARRETT R. VAN WAGONER
                                  ------------------------------------
                            Title: DIRECTOR
                                   -----------------------------------
                            345 California Street
                            Suite 2450
                            San Francisco, California 94104
                            Shares: 582,703
                            Purchase Price: $3,339,995

                            VAN WAGONER CAPITAL PARTNERS, L.P.

                            By: /S/ GARRETT R. VAN WAGONER
                                --------------------------------------
                            Name: GARRETT R. VAN WAGONER
                                  ------------------------------------
                            Title: GENERAL PARTNER
                                   -----------------------------------
                            345 California Street
                            Suite 2450
                            San Francisco, California 94104
                            Shares: 22,021
                            Purchase Price: $126,222

                            VAN WAGONER CROSSOVER FUND, LP

                            By: /S/ GARRETT R. VAN WAGONER
                                --------------------------------------
                            Name: GARRETT R. VAN WAGONER
                                  ------------------------------------
                            Title: MANAGING MEMBER GENERAL PARTNER
                                   -----------------------------------
                            345 California Street
                            Suite 2450
                            San Francisco, California 94104
                            Shares: 1,000,329
                            Purchase Price: $5,733,785

<PAGE>

                            /S/ BILL RUSHER
                             -----------------------------------------
                            BILL RUSHER
                            142 Sansome Street
                            5th Floor
                            San Francisco, CA 94104
                            Shares: 8,723
                                    ----------------------------------
                            Purchase Price: $50,000
                                            --------------------------

                            /S/ FRANK JUSKA
                            ------------------------------------------
                            FRANK JUSKA
                            142 Sansome Street
                            5th Floor
                            San Francisco, CA 94104
                            Shares: 8,723
                                    ----------------------------------
                            Purchase Price: $50,000
                                            --------------------------

                            /S/ WILL HERMAN
                            ------------------------------------------
                            WILL HERMAN
                            8 Cobblestone Place
                            Sudbury, MA 01776
                            Shares: 34,842
                                    ----------------------------------
                            Purchase Price: $200,000
                                            --------------------------

<PAGE>

                            COMMVAULT SYSTEMS, INC.

                            By: /S/ N. ROBERT HAMMER
                                --------------------------------------
                            Name: N. ROBERT HAMMER
                                  ------------------------------------
                            Title: CEO
                                   -----------------------------------

<PAGE>

                                   SCHEDULE A

                                  SUBSIDIARIES

CommVault Systems (Canada) Inc., a Canadian corporation
CommVault Systems Mexico S de RL de CV, a Mexican company
CommVault Holding Company BV, a Netherlands company
CommVault Systems Netherlands BV, a Netherlands company

<PAGE>

                                   SCHEDULE B

1.    Employment Agreement, dated as of January 20, 1999, between the Company
      and N. Robert Hammer, under which Mr. Hammer has received options to
      purchase common stock.

2.    Corporate Change of Control Agreements, between the Company and (i) Louis
      Miceli, (ii) Brian McAteer, (iii) Harry Cormier and (iv) Al Bunte.

3.    Stock Plan dated as of May 22, 1996, pursuant to which (i) the Company is
      authorized to issue options to purchase 8.7 million shares of its common
      stock and (ii) options to purchase 8.2 million shares of common stock have
      been granted.

4.    Preferred Stock holders have conversion rights, pursuant to the Amended
      Certificate, and preemptive rights pursuant to the Stockholders'
      Agreement, dated as of May 22, 1996 and amended as of July 23, 1998,
      between the Company and DLJ Merchant Banking Partners, L.P., DLJ
      International Partners C.V., DLJ Offshore Partners C.V., DLJ Merchant
      Banking Funding, Inc., DLJ Capital Corporation, Sprout Growth II L.P.,
      Sprout CEO Fund L.P. and certain other investors.

5.    A Warrant to purchase common stock was issued to DLJ Merchant Banking
      Partners, L.P. and certain of its Affiliates in connection with the Loan
      Agreement dated as of January 14, 2000, between the Company and the
      Lenders therein.

6.    Purchase Agreement, dated as of August 4, 1999, between the Company and
      Comm Vault Systems International, B.V. ("CVSI") and the shareholders of
      CVSI, pursuant to which the Company's common stock would be issued in
      consideration for the acquisition of the business of CVSI by the Company.

7.    The Company expects to consummate an acquisition of Northern Concepts
      Incorporated ("NCI"), pursuant to which the Company's common stock may be
      issued in consideration for the acquisition of the business of NCI by the
      Company.

The Company may, from time to time, issue additional shares of common stock or
options or warrants to purchase its common stock in an effort to recruit new
officers and employees.<PAGE>

                                                                   Exhibit 10.15

                               PURCHASE AGREEMENT

                  THIS PURCHASE AGREEMENT (this "AGREEMENT"), dated as of
November 10, 2000, is by and between EMC Investment Corporation, a Delaware
corporation ("EMC"), and the other persons listed on the signature page hereto
(collectively with EMC, the "PURCHASERS"), and CommVault Systems, Inc., a
Delaware corporation (the "COMPANY").

                  WHEREAS, each of the Purchasers desire to invest in the
Company; and

                  WHEREAS, the Company desires to issue and sell to the
Purchasers an aggregate of 2,758,358 shares of its Series BB Preferred Stock
(the "SHARES") and the Purchasers desire to purchase the Shares on the terms and
subject to the conditions described herein.

                  NOW, THEREFORE, in consideration of the premises and of the
mutual covenants, agreements and warranties herein contained, the parties hereto
agree as follows:

                  1. DEFINITIONS. Capitalized terms that are not defined in the
text of this Agreement have the meanings set forth below:

         "Affiliate" shall mean, with respect to any specified Person, any other
Person which, directly or indirectly, owns or controls, is under common
ownership or control with, or is owned or controlled by, such specified Person.
For purposes of this definition, a Person shall be deemed to control another
Person if the first Person owns or holds more than 50% of the voting power of
the second Person.

         "Amended Certificate" shall mean the Amended and Restated Certificate
of Incorporation of the Company in the form of Exhibit 2.

         "Board of Directors" shall mean the board of directors of the Company.

         "Conversion Shares" shall have the meaning set forth in Section 5(e).

         "Governmental Authority" shall mean the government of the United States
or any foreign country or any state or political subdivision thereof and any
entity, body or authority exercising executive, legislative, judicial,
regulatory or administrative functions of or pertaining to government.

         "Initial Public Offering" shall mean the initial public offering or
sale of common stock by the Company through underwriters or otherwise, that
requires registration, qualification or the filing of a prospectus under
applicable securities laws.

         "Knowledge" means the actual knowledge of N. Robert Hammer, Louis
Miceli, Larry Cormier or Al Bunte.

         "Law" shall mean any law, statute, regulation, ordinance, rule, order,
decree, judgment, consent decree, settlement agreement or governmental
requirement enacted, promulgated, entered into, agreed or imposed by any
Governmental Authority.

                                                              PURCHASE AGREEMENT
<PAGE>

         "Lien" shall mean any mortgage, lien (except for any lien for taxes not
yet due and payable), charge, restriction, pledge, security interest, option,
lease or sublease, claim, right of any third party, easement, encroachment or
encumbrance.

         "Material Adverse Effect" shall mean an effect on the business,
operations, assets, liabilities, results of operations, cash flows or condition
(financial or otherwise) of the Company which is material and adverse.

         "Non-Preemptive Shares" shall mean any voting shares of the capital
stock of the Company issued, sold, granted or conveyed (i) in connection with
any acquisition of all or a portion of any Person or a merger or combination
with any Person duly authorized by the Board of Directors, (ii) to any current
or new director, officer, employee or consultant of the Company pursuant to any
plan or arrangement, now or hereafter existing, duly authorized by the Board of
Directors or (iii) pursuant to any of the items listed on SCHEDULE B.

         "Person" shall mean any individual, corporation, proprietorship, firm,
partnership, limited liability company, limited partnership, trust, association
or other entity.

         "Preferred Stock" shall mean, collectively, the Company's issued and
outstanding Series A Preferred Stock, Series B Preferred Stock, Series C
Preferred Stock, Series D Preferred Stock, Series E Preferred Stock and Series
AA Preferred Stock.

         "Registration Rights Agreement" shall mean a Registration Rights
Agreement to be entered into between Purchasers and the Company as of the
Closing in the form of Exhibit 1.

         "Related Agreements" shall mean, (i) with respect to the Company and
EMC, the Registration Rights Agreement and the Warrant and (ii) with respect to
the other Purchasers, only the Registration Rights Agreement.

         "Securities Act" shall mean the Securities Act of 1933, as amended.

         "Stock Plan" shall mean the Company's stock plan, as described on
SCHEDULE B.

         "Subsidiaries" shall mean the Persons set forth on SCHEDULE A.

         "Warrant" shall mean a warrant to be issued to EMC to purchase shares
of common stock of the Company in the form of Exhibit 3.

         "Warrant Shares" shall have the meaning set forth in Section 5(e).

2.       PURCHASE AND SALE OF SHARES.

         (a) PURCHASE PRICE. Subject to the terms and conditions set forth in
this Agreement, at the Closing (as hereinafter defined), the Purchasers shall
purchase, and the Company shall issue and sell to the Purchasers the Shares for
an aggregate purchase price (the "Purchase Price") of $33,376,131.80. The number
of Shares being sold to each Purchaser and the portion of the Purchase Price
attributable thereto is set forth under such Purchaser's name on the signature
page hereto.

                                                              PURCHASE AGREEMENT

                                      -2-

<PAGE>

         (b) CLOSING. The closing (the "Closing") of the transactions described
herein shall occur on November 10, 2000, or such other date as agreed upon by
the Purchasers and the Company. At the Closing, the Purchasers shall pay the
Company the Purchase Price in cash by wire transfer of immediately available
funds to an account designated by the Company at least two business days before
the Closing and the Company shall deliver to each Purchaser a certificate
representing the Shares purchased by such Purchaser.

                  3. REPRESENTATIONS AND WARRANTIES OF THE COMPANY. The Company
hereby represents and warrants to each of the Purchasers:

         (a) DUE INCORPORATION; SUBSIDIARIES. Each of the Company and the
Subsidiaries is duly incorporated, validly existing and in good standing under
the laws of its jurisdiction of incorporation, with all requisite power and
authority to own, lease and operate its properties and to carry on its business
as they are now being owned, leased, operated and conducted. Each of the Company
and the Subsidiaries is licensed or qualified to do business and is in good
standing as a foreign corporation in each jurisdiction where the nature of the
properties owned, leased or operated by it and the businesses transacted by it
require such licensing or qualification, except where the failure to be so
licensed or qualified would not individually or in the aggregate have a Material
Adverse Effect. Except as set forth on SCHEDULE A, the Company has no direct or
indirect subsidiaries, either wholly or partially owned, and the Company does
not hold any direct or indirect economic, voting or management interest in any
Person or directly or indirectly own any security issued by any Person. Each
Subsidiary is wholly owned by the Company.

         (b) DUE AUTHORIZATION. The Company has full power and authority to
enter into this Agreement and its Related Agreements and to consummate the
transactions contemplated hereby and thereby. The execution, delivery and
performance by the Company of this Agreement and its Related Agreements have
been duly and validly approved by the board of directors of the Company and no
other actions or proceedings on the part of the Company are necessary to
authorize this Agreement, the Related Agreements and the transactions
contemplated hereby and thereby. The Company has duly and validly executed and
delivered this Agreement and has duly and validly executed and delivered (or
prior to or at the Closing will duly and validly execute and deliver) its
Related Agreements. This Agreement constitutes legal, valid and binding
obligations of the Company and the Company's Related Agreements upon execution
and delivery by the Company will constitute legal, valid and binding obligations
of the Company, in each case, enforceable in accordance with their respective
terms, except as such enforceability may be limited by applicable bankruptcy,
insolvency, moratorium, reorganization or similar laws in effect which affect
the enforcement of creditors' rights generally and by equitable limitations on
the availability of specific remedies.

         (c) CONSENTS AND APPROVALS; AUTHORITY RELATIVE TO THIS AGREEMENT.

                  (i) No consent, authorization or approval of, filing or
registration with, or cooperation from, any Governmental Authority or any other
Person not a party to this Agreement that has not been received by the Company
is necessary in connection with the execution, delivery and performance by the
Company of this Agreement and the execution, delivery and performance by the
Company of Related Agreements or the consummation of the transactions

                                                              PURCHASE AGREEMENT

                                      -3-

<PAGE>

contemplated hereby or thereby (including, without limitation, the offer,
issuance, sale and delivery of the Shares, the Conversion Shares and the Warrant
Shares).

                  (ii) The execution, delivery and performance by the Company of
this Agreement and its Related Agreements do not and will not (1) violate any
Law; (2) violate or conflict with, result in a breach or termination of,
constitute a default or give any third party any additional right (including a
termination right) under, permit cancellation of, result in the creation of any
Lien upon any of the assets or properties of the Company under, or result in or
constitute a circumstance which, with or without notice or lapse of time or
both, would constitute any of the foregoing under, any contract to which the
Company, is a party or by which the Company or any of its assets or properties
are bound; (3) permit the acceleration of the maturity of any indebtedness of
the Company or indebtedness secured by its assets or properties; or (4) violate
or conflict with any provision of any of the Amended Certificate or by-laws of
the Company.

         (d) CAPITALIZATION.

                  (i) The authorized capital stock of the Company is as
described in the Amended Certificate. All of the outstanding capital stock of
the Company and each Subsidiary (i) is validly issued, fully paid and
nonassessable and (ii) is free of preemptive rights (except as provided in the
Amended Certificate or this Agreement). When issued, the Shares, the Conversion
Shares and the Warrant Shares will be validly issued, fully paid and
nonassessable and will not have been issued in violation of any preemptive
rights or rights of first refusal. The authorized capital stock as described in
the Amended Certificate contains a sufficient number of shares of common stock
for issuance of the Conversion Shares and Warrant Shares.

                  (ii) Except as set forth above or on SCHEDULE B, there are no
shares of capital stock or other securities (whether or not such securities have
voting rights) of the Company issued or outstanding or any subscriptions,
options, warrants, calls, rights, convertible securities or other agreements or
commitments of any character obligating the Company to issue, transfer or sell,
or cause the issuance, transfer or sale of, any shares of its capital stock or
other securities (whether or not such securities have voting rights). Except as
set forth in SCHEDULE B, there are no outstanding contractual obligations of the
Company which relate to the purchase, sale, issuance, repurchase, redemption,
acquisition, transfer, disposition, holding or voting of any shares of its
capital stock or other securities. The maximum number of shares of common stock
that the Company has issued and would be obligated to issue as of the date
hereof pursuant to the agreements listed in paragraphs 1-8 of SCHEDULE B is
57,868,509 shares on a fully diluted basis, plus any Shares issued hereunder
(including the Warrant Shares) and the shares issuable pursuant to the warrant
listed in paragraph 9 of SCHEDULE B.

         (e) LITIGATION.

                  (i) There is no claim, action, suit, investigation or
proceeding ("LITIGATION") pending or, to the Knowledge of the Company,
threatened against the Company or any Subsidiary, or involving any of its
properties or assets by or before any court, arbitrator or other Governmental
Entity which (1) in any manner challenges or seeks to prevent, enjoin, alter or
materially delay the transactions contemplated by this Agreement or (2) if
resolved adversely to

                                                              PURCHASE AGREEMENT

                                      -4-

<PAGE>

the Company or any Subsidiary, would reasonably be expected to have a Material
Adverse Effect.

                  (ii) Neither the Company nor any Subsidiary is in default
under or in breach of any order, judgment or decree of any court, arbitrator or
other Governmental Authority, except for defaults or breaches, which
individually or in the aggregate would not reasonably be expected to have a
Material Adverse Effect.

         (f) INTELLECTUAL PROPERTY. The Company has title and ownership of, or
has license to, all patents, patent applications, trademarks, service marks,
trade names, copyrights, trade secrets and other confidential and proprietary
information (collectively, the "PROPRIETARY ASSETS") necessary to enable it to
carry on its business as now conducted and as presently proposed to be conducted
without any conflict with or infringement of the rights of others, except where
any failure to have such title, ownership or license would not have a Material
Adverse Effect. To the Knowledge of the Company, no person or entity has any
ownership right, title, interest, claim in or lien on any of the Company's
Proprietary Assets. No current or former employee or consultant of the Company
has any ownership right, title, interest, claim in or lien on any of the
Company's Proprietary Assets, other than such rights, title, interests, claims
or liens that would not have a Material Adverse Effect. The Company has not
granted and, to the Knowledge of the Company, there are not outstanding, any
options, licenses or agreements of any kind relating to any Proprietary Asset of
the Company, nor is the Company bound by or a party to any option, license or
agreement of any kind with respect to any of its Proprietary Assets. To the
Knowledge of the Company, the Company has not violated or infringed, and would
not, by conducting its business as currently proposed, violate or infringe, any
Proprietary Asset of any other person or entity except for such violations or
infringements that would not have a Material Adverse Effect. Each employee of
the Company hired after January 1, 1998 has signed an Employee Inventions and
Confidentiality Agreement in the form attached hereto as Exhibit 4.

         (g) FINANCIAL STATEMENTS. The Company has furnished to each of the
requesting Purchasers a complete and correct copy of the balance sheet of the
Company at September 30, 2000, and the statement of income for the period from
March 31, 2000 through September 30, 2000 (collectively, the "FINANCIAL
STATEMENTS"). The Financial Statements are complete and correct, are in
accordance with the books and records of the Company and present fairly in all
material respects the financial condition and results of operations of the
Company, at the dates and for the periods indicated, and have been prepared in
accordance with generally accepted accounting principles ("GAAP") consistently
applied, except that the unaudited Financial Statements may not be in accordance
with GAAP because of the absence of footnotes normally contained therein and are
subject to normal year-end adjustments which in the aggregate are not expected
to be material.

         (h) ABSENCE OF UNDISCLOSED LIABILITIES. The Company does not have any
liability (whether known or unknown and whether absolute or contingent), except
for (a) liabilities shown on the Financial Statements, (b) liabilities that have
arisen since September 30, 2000 in the ordinary course of business and (c)
contractual and other liabilities incurred in the ordinary course of business
that are not material and not required by GAAP to be reflected on a balance
sheet.

                                                              PURCHASE AGREEMENT

                                      -5-

<PAGE>

         (i) ABSENCE OF CHANGES. Since September 30, 2000, the Company has
conducted its business in the ordinary course, consistent with past practice.

         (j) CONTRACTS. The Company does not have and is not bound by any
contract, agreement, lease or commitment, other than (i) contracts for the
purchase of supplies and services or the licensing of technology that were
entered into in the ordinary course of business that do not involve more than
$250,000 per year and do not extend for more than one year, (ii) sales contracts
entered into in the ordinary course of business, (iii) the leases for the
Company's office or other space, (iv) contracts terminable at will by the
Company on no more than 30 days' notice without cost or liability to the
Company, (v) an agreement with Microsoft Corporation, dated as of April 12,
2000, or (vi) other contacts the loss of which would not have a Material Adverse
Effect. To the Knowledge of the Company, all of the contracts to which it is a
party are valid and binding and are in full force and effect as of the date of
this Agreement.

         (k) REGISTRATION RIGHTS. Other than the Registration Rights Agreement,
the registration rights agreement with the holders of the Series AA Preferred
Stock, dated April 14, 2000, the Stockholders Agreement listed in paragraph 4 of
SCHEDULE B, and the piggyback registration rights granted pursuant to the
Purchase Agreement listed in paragraph 6 of SCHEDULE B, the Company has not
granted any registration rights to any party for any of its securities.

         (l) COMPLIANCE WITH LAWS. The Company and each Subsidiary are in
compliance in all material respects with all applicable Laws. All securities
issued by the Company prior to the date hereof have been issued in transactions
exempt from the registration requirements of Section 5 of the Securities Act.

         (m) OFFERING OF SHARES. Neither the Company nor any Person acting on
its behalf has taken or will take any action (including, without limitation, any
offering of any securities of the Company under circumstances which would
require, under the Securities Act, the integration of such offering with the
offering and sale of the Shares) which might reasonably be expected to subject
the offering, issuance or sale of the Shares to the registration requirements of
the Securities Act. Subject to the continuing accuracy of the Purchasers'
representations in Section 4, the offer, sale and issuance of the Shares, the
Conversion Shares and the Warrant Shares in conformity with the terms of this
Agreement, the Amended Certificate and the Warrant constitute or will constitute
transactions exempt from the registration requirements of Section 5 of the
Securities Act.

         (n) BROKERS. No broker, finder or investment banker is entitled to any
brokerage, finder's or other fee or commission from any party in connection with
the transactions contemplated by this Agreement based upon arrangements made by
or on behalf of the Company.

                  4. REPRESENTATIONS AND WARRANTIES OF PURCHASERS. Each of the
Purchasers severally but not jointly hereby represents and warrants to the
Company as follows:

         (a) DUE INCORPORATION. Each Purchaser that is not an individual is duly
organized, validly existing and in good standing under the laws of its
jurisdiction of organization, with all

                                                              PURCHASE AGREEMENT

                                      -6-

<PAGE>

requisite power and authority to own, lease and operate its properties and to
carry on its business as they are now being owned, leased, operated and
conducted.

         (b) DUE AUTHORIZATION. Each Purchaser that is not an individual has
full power and authority to enter into this Agreement and its Related Agreements
and to consummate the transactions contemplated hereby and thereby. The
execution, delivery and performance by such Purchaser of this Agreement and its
Related Agreements have been duly and validly approved by its governing body
empowered to authorize the transactions contemplated by this Agreement and its
Related Agreements and no other actions or proceedings on the part of such
Purchaser are necessary to authorize this Agreement, its Related Agreements and
the transactions contemplated hereby and thereby.

         (c) DUE EXECUTION; BINDING EFFECT. Such Purchaser has validly executed
and delivered this Agreement and has duly and validly executed and delivered (or
prior to or at the Closing will duly and validly execute and deliver) its
Related Agreements. This Agreement constitutes legal, valid and binding
obligations of such Purchaser and such Purchaser's Related Agreements upon
execution and delivery by such Purchaser (as applicable) will constitute legal,
valid and binding obligations of such Purchaser, in each case, enforceable in
accordance with their respective terms, except as such enforceability may be
limited by applicable bankruptcy, insolvency, moratorium, reorganization or
similar laws in effect which affect the enforcement of creditors' rights
generally and by equitable limitations on the availability of specific remedies.

         (d) CONSENTS AND APPROVALS; AUTHORITY RELATIVE TO THIS AGREEMENT.

                  (i) No consent, authorization or approval of, filing or
registration with, or cooperation from, any Governmental Authority or any other
Person not a party to this Agreement is necessary in connection with the
execution, delivery and performance by such Purchaser of this Agreement and its
Related Agreements and the consummation by such Purchaser of the transactions
contemplated hereby and thereby.

                  (ii) The execution, delivery and performance by such Purchaser
of this Agreement and its Related Agreements do not and will not (1) violate any
Law applicable to such Purchaser; (2) violate or conflict with, result in a
breach or termination of, constitute a default or give any third party any
additional right (including a termination right) under, permit cancellation of,
result in the creation of any Lien upon any of the assets or properties of such
Purchaser under, or result in or constitute a circumstance which, with or
without notice or lapse of time or both, would constitute any of the foregoing
under, any contract to which Purchaser is a party or by which such Purchaser or
any of its assets or properties are bound; (3) permit the acceleration of the
maturity of any indebtedness of such Purchaser or indebtedness secured by its
assets or properties; or (4) for each Purchaser that is not an individual,
violate or conflict with any provision of such Purchaser's organizational
documents.

         (e) BROKERS. No broker, lender or investment banker is entitled to any
brokerage, lender's or other fee or commission from any party in connection with
the transactions contemplated by this Agreement based on arrangements made by or
on behalf of such Purchaser.

                                                              PURCHASE AGREEMENT

                                      -7-

<PAGE>

         (f) PURCHASE FOR INVESTMENT. Such Purchaser is purchasing the Shares
hereunder for investment without any intent of the distribution thereof within
the meaning of the Securities Act.

         (g) ACCREDITED INVESTOR. Such Purchaser is an "accredited investor"
within the meaning of Regulation 501(a) under the Securities Act and is able to
bear the economic risk of acquisition of the Shares, can afford to sustain a
total loss on such investment, and has such knowledge and experience in
financial and business matters that it is capable of evaluating the merits and
risk of the proposed investment. Such Purchaser has been furnished the
opportunity to ask questions of and receive answers from representatives of the
Company concerning the business and financial affairs of the Company.

                  5. COVENANTS.

         (a) FINANCIAL INFORMATION. (1) As soon as practicable after the end of
each fiscal year of the Company, and in any event within 120 days thereafter,
the Company shall furnish to each Purchaser that holds (together with its
Affiliates) at least 750,000 Shares, an audited balance sheet and income
statement of the Company (the "FINANCIAL INFORMATION") as at the end of such
fiscal year, prepared in accordance with GAAP consistently applied.

                  (2) As soon as practicable after the end of the first, second
and third quarterly accounting periods in each fiscal year of the Company, and
in any event within 60 days thereafter, the Company shall furnish to each
Purchaser that holds (together with its Affiliates) at least 750,000 Shares,
unaudited Financial Information for such period and for such fiscal year to
date, prepared in accordance with GAAP consistently applied, subject to changes
resulting from normal year-end audit adjustments, and except that such Financial
Information need not contain the notes required by GAAP.

                  (3) Each Purchaser acknowledges that any information obtained
by such Purchaser pursuant to this Section 5(a) that may be proprietary to the
Company or otherwise confidential shall not be disclosed without the prior
written consent of the Company and the provision of such information shall be
subject to the receipt by the Company of a confidentiality agreement covering
such information and reasonably acceptable to the Company and such Purchaser.
Each Purchaser further acknowledges and understands that any information so
obtained that may be considered "inside" non-public information shall not be
utilized by such Purchaser in connection with purchases and/or sales of the
Company's securities except in compliance with applicable state and federal
antifraud statutes. The Company may exclude a Purchaser from the distribution of
the information to be delivered pursuant hereto if the Board of Directors
determines in good faith upon advice of counsel that such exclusion is
reasonably necessary to preserve attorney-client privilege or to protect other
similar confidential information. The rights and obligations of the parties
pursuant to this Section 5(a) shall terminate upon the closing of an Initial
Public Offering.

         (b) BOARD OBSERVER. EMC shall be entitled to designate one non-voting
observer (the "NON-VOTING OBSERVER") to attend (but not vote at) all meetings of
the Board of Directors. The Non-Voting Observer shall have the same access to
information concerning the business and operations of the Company and at the
same time as the directors of the Company, except for such

                                                              PURCHASE AGREEMENT

                                      -8-

<PAGE>

information that the Company reasonably determines it cannot distribute for
confidentiality reasons, and shall be entitled to ask questions of the Board of
Directors, but shall not be entitled to vote or otherwise seek to influence the
business decisions of the Board of Directors. Any other Purchaser that owns
(together with its Affiliates) at least 750,000 Shares shall also have the same
access to financial information of the Company at the same time as the directors
of the Company, except for such information that the Company reasonably
determines it cannot distribute for confidentiality reasons. The provision of
any such information to the Non-Voting Observer and any such Purchasers shall be
subject to the receipt by the Company of a confidentiality agreement covering
such information and reasonably acceptable to the Company and such Purchaser. If
(1) the Company receives or solicits an expression of interest to purchase or
sell (i) more than 50% of the voting stock of the Company or (ii) all or
substantially all of the assets of the Company, or (2) there occurs a Material
Adverse Effect, then the Company shall promptly notify EMC of such expression of
interest or Material Adverse Effect, as the case may be, and EMC shall be
entitled to designate for election to the Board of Directors one director (the
"EMC DIRECTOR"). The Company will, to the extent requested by EMC, take all
action necessary for the EMC Director to be elected to the Board of Directors as
soon as possible after such request by EMC. In connection with any annual
meeting of stockholders of the Company at which the term of the EMC Director is
to expire, the Company will take all necessary action to cause the EMC Director
to be nominated and use its reasonable best efforts to cause the EMC Director to
be elected to the Board of Directors. In the event a vacancy shall exist in the
office of the EMC Director, EMC shall be entitled to designate a successor and
the Board of Directors shall elect such successor and, in connection with the
meeting of stockholders of the Company next following such election, nominate
such successor for election as director by the stockholders and use its
reasonable best efforts to cause the successor to be elected. EMC's right to
nominate the EMC Director (if such right comes into existence after the date
hereof) and the Non-Voting Observer and the Company's obligation (if such
obligation comes into existence after the date hereof) to take any action to
cause the EMC Director to be elected to the Board of Directors shall terminate
as of the Initial Public Offering. In addition, the term of the EMC Director and
all rights of the EMC Director and the Non-Voting Observer and any other
Purchasers, including the rights to observe and have access to the books and
records of the Company and other information as provided above, shall expire as
of such time. Subject to any other agreement between the parties, EMC and any
other Purchaser that receives information agrees that the information provided
by the Company, officers, directors and employees pursuant to this Section 5(b)
will be used solely for the purpose of evaluating such Purchaser's investment in
the Shares, the Conversion Shares and the Warrant Shares, as applicable, and
that such information will be kept strictly confidential by such Purchaser;
PROVIDED that the foregoing obligation of such Purchaser shall not (a) relate to
any information that (i) is or becomes generally available other than as a
result of unauthorized disclosure by such Purchaser or by persons to whom such
Purchaser has made such information available, (ii) is already in such
Purchaser's possession, provided that such information is not subject to another
confidentiality agreement with or other obligation of secrecy to the Company or
(iii) is or becomes available to such Purchaser on a non-confidential basis from
a third party that is not, to such Purchaser's knowledge, bound by any other
confidentiality agreement with the Company or its subsidiaries, or (b) prohibit
disclosure of any information if required by Law or the rules of any stock
exchange. EMC and each other Purchaser hereby acknowledges that it is aware that
the United States securities laws prohibit any person who has received from an
issuer or any

                                                              PURCHASE AGREEMENT

                                      -9-

<PAGE>

Affiliate thereof any material, non-public information from
purchasing or selling securities of such issuer or from communicating such
information to any other person under circumstances in which it is reasonably
foreseeable that such person is likely to purchase or sell such securities.

         (c) AMENDED CERTIFICATE. The Company shall, prior to or concurrently
with the Closing, cause the Amended Certificate to be filed with the Secretary
of State of the State of Delaware.

         (d) COOPERATION. Each of the Purchasers and the Company agrees to use
its reasonable best efforts to take, or cause to be taken, all such further
actions as shall be necessary to make effective and consummate the transactions
contemplated by this Agreement.

         (e) RESERVE SHARES. The Company will at all times reserve and keep
available, solely for issuance and delivery upon conversion of the Shares, the
number of shares of common stock from time to time issuable upon conversion of
all Shares at the time outstanding (the "CONVERSION SHARES") and any shares of
common stock to be issued pursuant to the Warrant (the "WARRANT SHARES"). All
Conversion Shares and Warrant Shares shall be duly authorized and, when issued
upon such conversion or exercise in accordance with the Amended Certificate or
the Warrant, as the case may be, shall be validly issued, fully paid and
nonassessable.

         (f) RESTRICTIONS ON TRANSFER. The Purchasers will not, prior to the
earlier of (a) December 31, 2004 or (b) the time of the closing of the Initial
Public Offering, sell, transfer, assign, convey, gift, mortgage, pledge,
encumber, hypothecate, or otherwise dispose of, directly or indirectly,
("TRANSFER") any of the Shares or any Conversion Shares except for (i) Transfers
between and among the Purchasers and their Affiliates provided such Transfer is
in accordance with the transfer restrictions applicable to the Shares or the
Conversion Shares under federal and state securities laws and the Affiliate
transferee agrees to be bound by the restrictions applicable to such Shares or
Conversion Shares, including without limitation the agreements set forth in this
Section 5(f), and (ii) Transfers (x) pursuant to a bona fide tender or exchange
offer made pursuant to a merger or other agreement approved by the Board of
Directors to acquire securities of the Company; PROVIDED, that the Purchasers
may not tender or exchange in such offer unless at least 50% of the outstanding
voting securities of the Company have previously been tendered or exchanged by
other holders of the Company's securities in connection therewith, (y) pursuant
to any cash merger, or other business combination transaction to which the
Company is a party or involved in which the common stock of the Company's
stockholders is exchanged for cash upon consummation of such merger or other
business combination or (z) agreed to in writing by the Company. Notwithstanding
any other provision of this Section 5(f), no Purchaser shall avoid the
provisions of this Section 5(f) by making one or more transfers to one or more
Affiliates and then disposing of all or any portion of such Purchaser's interest
in any such Affiliate.

         (g) PREEMPTIVE RIGHT. If at any time the Company desires to issue or
sell any shares (the "ADDITIONAL Shares") of its capital stock that entitle the
holder thereof to voting rights (other than Non-Preemptive Shares) to any
Person, the Company shall give a written notice (the "ISSUANCE NOTICE") to the
Purchasers setting forth the proposed terms of such Additional Shares and the
quantity of Additional Shares to be issued, the issuance date and the price at
which such Additional Shares shall be issued. Each of the Purchasers shall have
the option to purchase the number of Additional Shares necessary to maintain
such Purchaser's percentage of issued and

                                                              PURCHASE AGREEMENT

                                      -10-

<PAGE>

outstanding voting shares of the Company at the time of the Issuance Notice,
which option may be exercised by giving written notice to the Company (the
"RESPONSE NOTICE") within 14 days of the Issuance Notice that contains an
unconditional agreement to purchase all (and not less than all) of the
Additional Shares to which such Purchaser is entitled to purchase. Failure by a
Purchaser to give the Response Notice to the Company within such 14-day period
shall be deemed to be a rejection of such option. At the option of the Company,
within 14 days of Company's receipt of the Response Notice or at the time of the
closing of the sale of Additional Shares to any Persons pursuant to the next
sentence, the Company shall sell to such Purchaser and such Purchaser shall
purchase the Additional Shares that such Purchaser agreed to purchase in the
Response Notice, at the price and on the terms set forth in the Issuance Notice.
For a period of 270 days after any Issuance Notice, the Company shall have the
right to issue or sell to any Person up to the number of Additional Shares
specified in the Issuance Notice less the number of Additional Shares pursuant
to duly tendered Response Notices at a price and on terms not materially less
favorable to the Company than as specified in the Issuance Notice. If the
Company desires to issue or sell Additional Shares, (i) after such 270-day
period, (ii) on terms materially less favorable to the Company than as specified
in the Issuance Notice or (iii) in a quantity greater than as specified in the
previous sentence, the Company must again comply with this Section 5(g). The
rights and obligations of the parties pursuant to this Section 5(g) shall
terminate upon the closing of an Initial Public Offering.

         (h) COMPLIANCE WITH SECURITIES LAWS. Such Purchaser understands that
the Shares, the Conversion Shares and the Warrant Shares will not be registered
under the Securities Act or applicable state securities laws and agrees not to
sell, pledge or otherwise transfer any of the Shares, Conversion Shares and the
Warrant Shares in the absence of such registration or an opinion of counsel
reasonably satisfactory to the Company that such registration is not required.
Except as set forth in the Registration Rights Agreement, such Purchaser
acknowledges that the Company is not required to register the Shares, the
Conversion Shares or the Warrant Shares.

                  6. CONDITIONS.

         (a) CONDITIONS TO OBLIGATIONS OF THE PURCHASERS. The obligations of the
Purchasers to consummate the transactions contemplated hereby shall be subject
to the satisfaction or waiver at or prior to the Closing of each of the
following conditions:

                  (i) No statute, rule or regulation or order of any court or
administrative agency shall be in effect which prohibits the consummation of the
transactions contemplated hereby;

                  (ii) The Company shall have performed, satisfied and complied
in all material respects with all of its covenants and agreements set forth in
this Agreement to be performed, satisfied and complied with prior to or at the
Closing;

                  (iii) The Company shall have executed and delivered to each of
the Purchasers the Registration Rights Agreement;

                                                              PURCHASE AGREEMENT

                                      -11-

<PAGE>

                  (iv) The Amended Certificate shall have been duly filed with
the Secretary of State of the State of Delaware in accordance with the laws of
the State of Delaware and the Amended Certificate shall be in full force and
effect;

                  (v) The Company shall have executed and delivered to EMC the
Warrant;

                  (vi) The Conversion Shares and the Warrant Shares shall have
been duly authorized and reserved for issuance;

                  (vii) Mayer, Brown & Platt shall have delivered an opinion in
form and substance reasonably satisfactory to Purchasers;

                  (viii) The Company shall have delivered a good standing
certificate for the Company; and

                  (ix) There shall not have occurred any event, circumstances,
condition, fact, effect, or other matter which has had or would reasonably be
expected to have a Material Adverse Effect.

         (b) CONDITIONS TO OBLIGATIONS OF THE COMPANY. The obligations of the
Company to consummate the transactions contemplated hereby shall be subject to
the satisfaction or waiver at or prior to the Closing of each of the following
conditions:

                  (i) No statute, rule or regulation or order of any court or
administrative agency shall be in effect which prohibits the consummation of the
transactions contemplated hereby;

                  (ii) Each of the Purchasers shall have executed and delivered
to the Company its Related Agreements; and

                  (iii) The Purchasers shall have performed, satisfied and
complied in all material respects with all of their covenants and agreements set
forth in this Agreement to be performed, satisfied and complied with prior to or
at the Closing Date.

                  7. [INTENTIONALLY OMITTED]

                  8. SURVIVAL OF REPRESENTATIONS AND WARRANTIES.

         The representations and warranties of the parties contained in this
Agreement shall expire on the 18-month anniversary of the Closing, except for
those representations and warranties contained in Sections 3(b) and 3(d) which
shall expire on the later of (i) the 18-month anniversary of the Closing or (ii)
the closing of an Initial Public Offering. After the expiration of such period,
any claim by a party based upon any such representation or warranty shall be of
no further force and effect, except to the extent a party has given notice to
the other party of a claim for breach of any such representation or warranty
prior to the expiration of such period, in which event any representation or
warranty to which such claim relates shall survive with respect to such claim
until such claim is resolved as provided in this Section 8. The covenants and

                                                              PURCHASE AGREEMENT
                                      -12-

<PAGE>

agreements of the parties hereto contained in this Agreement shall survive the
Closing until performed in accordance with their terms.

                  9. RESTRICTIVE LEGENDS. In addition to the restrictions set
forth in Section 5(f), no Shares, Conversion Shares or Warrant Shares may be
transferred without registration under the Securities Act and applicable state
securities laws unless counsel reasonably acceptable to the Company shall advise
the Company that such transfer may be effected without such registration. Each
certificate representing any of the foregoing shall bear legends in
substantially the following form:

         THE SECURITIES EVIDENCED BY THIS CERTIFICATE SHALL BE CONVERTIBLE INTO
         THE COMPANY'S COMMON STOCK IN THE MANNER AND ACCORDING TO THE TERMS SET
         FORTH IN THE CERTIFICATE OF INCORPORATION. THE COMPANY IS AUTHORIZED TO
         ISSUE MORE THAN ONE CLASS OR SERIES OF STOCK. AS REQUIRED UNDER
         DELAWARE LAW, THE COMPANY SHALL FURNISH TO ANY HOLDER UPON REQUEST AND
         WITHOUT CHARGE, A FULL SUMMARY STATEMENT OF THE DESIGNATIONS, VOTING
         RIGHTS, PREFERENCES, LIMITATIONS AND SPECIAL RIGHTS OF THE SHARES OF
         EACH CLASS OR SERIES AUTHORIZED TO BE ISSUED BY THE COMPANY SO FAR AS
         THEY HAVE BEEN FIXED AND DETERMINED AND THE AUTHORITY OF THE BOARD OF
         DIRECTORS TO FIX AND DETERMINE THE DESIGNATIONS, VOTING RIGHTS,
         PREFERENCES, LIMITATIONS AND SPECIAL RIGHTS OF THE CLASSES AND SERIES
         OF SECURITIES OF THE COMPANY.

         THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
         UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "1933 ACT"), OR UNDER
         ANY APPLICABLE STATE LAWS. THE SHARES REPRESENTED BY THIS CERTIFICATE
         HAVE BEEN ACQUIRED BY THE REGISTERED OWNER HEREOF FOR INVESTMENT AND
         NOT WITH A VIEW TO OR FOR SALE IN CONNECTION WITH ANY DISTRIBUTION
         THEREOF WITHIN THE MEANING OF THE 1933 ACT. THE SHARES MAY NOT BE SOLD,
         PLEDGED, TRANSFERRED OR ASSIGNED EXCEPT IN A TRANSACTION WHICH IS
         EXEMPT UNDER THE PROVISIONS OF THE 1933 ACT OR ANY APPLICABLE STATE
         SECURITIES LAWS, OR PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT OR
         IN A TRANSACTION OTHERWISE IN COMPLIANCE WITH APPLICABLE FEDERAL AND
         STATE SECURITIES LAWS.

         THE SALE, PLEDGE, TRANSFER, ASSIGNMENT OR OTHER DISPOSITION OF THE
         SHARES REPRESENTED BY THIS CERTIFICATE IS RESTRICTED BY AND SUBJECT TO
         THE PROVISIONS OF A PURCHASE AGREEMENT DATED AS OF NOVEMBER 10, 2000, A
         COPY OF WHICH IS AVAILABLE UPON REQUEST FOR INSPECTION AT THE OFFICE'S
         OF THE COMPANY. ANY SUCH REQUEST SHOULD BE ADDRESSED TO THE SECRETARY
         OF THE COMPANY.

                                                              PURCHASE AGREEMENT
                                      -13-

<PAGE>

                  10. SUCCESSORS AND ASSIGNS; NO THIRD PARTY BENEFICIARIES. This
Agreement shall bind and inure to the benefit of the Company and the Purchasers
and the respective successors, permitted assigns, heirs and personal
representatives of the Company and the Purchasers; PROVIDED that the Company may
not assign its rights or obligations under this Agreement to any Person without
the prior written consent of the Purchasers, and PROVIDED FURTHER that the
Purchasers may not assign their rights or obligations under this Agreement to
any Person (other than an Affiliate) without the prior written consent of the
Company. This Agreement is intended for the benefit of the parties hereto and
their respective permitted successors and assigns, and is not for the benefit
of, nor may any provision hereof be enforced by, any other person.

                  11. NOTICES. Each notice, demand, request, request for
approval, consent, approval, disapproval, designation or other communication
(each of the foregoing being referred to herein as a notice) required or desired
to be given or made under this Agreement shall be in writing (except as
otherwise provided in this Agreement), and shall be effective and deemed to have
been received (i) when delivered in person, (ii) when sent by fax with receipt
acknowledged, (iii) five days after having been mailed by certified or
registered United States mail, postage prepaid, return receipt requested, or
(iv) the next business day after having been sent by a nationally recognized
overnight mail or courier service, receipt requested. Notices shall be addressed
as set forth below:

         If to EMC:

                  EMC Corporation
                  35 Parkwood Drive
                  Hopkinton, MA 01748
                  Attn: Office of the General Counsel
                  Facsimile: (508) 497-6915

         with a copy to the Vice President, Corporate Development

                  Facsimile: (508) 435-8900

         If to any of the other Purchasers, at the address set forth under his
         name on the signature page.

         With a copy to:

         -----------------------------------------------------

         -----------------------------------------------------

         -----------------------------------------------------
                  Attn:
                       ---------------------------------------
                  Facsimile:
                            ----------------------------------

                                                              PURCHASE AGREEMENT
                                      -14-

<PAGE>

         If to the Company:

                  CommVault Systems, Inc.
                  2 Crescent Place
                  Oceanport, New Jersey 07757
                  Attn:  N. Robert Hammer
                  Facsimile:  (732) 870-4514

         With a copy to:

                  Mayer, Brown & Platt
                  190 S. LaSalle Street
                  Chicago, Illinois 60603
                  Attention: Philip J. Niehoff
                  Facsimile: (312) 701-7711

                  12. FURTHER ASSURANCES. At any time or from time to time after
the Closing, the Company, on the one hand, and the Purchasers, on the other
hand, agree to cooperate with each other, and at the request of the other party,
to execute and deliver any further instruments or documents and to take all such
further action as the other party may reasonably request in order to evidence or
effectuate the consummation of the transactions contemplated hereby and to
otherwise carry out the intent of the parties hereunder.

                  13. PUBLIC DISCLOSURE. Except as required by Law or the rules
of any stock exchange (in which case the Company shall give EMC notice at least
24 hours prior to any public announcement containing its name), no public
announcement or other publicity regarding the transactions referred to herein
shall be made by any of the Purchasers or the Company or any of their respective
Affiliates, officers, directors, employees, representatives or agents, without
the prior written agreement of Purchasers and Company, in any case, as to form,
content, timing and manner of distribution or publication; PROVIDED, HOWEVER,
that nothing in this Section shall prevent such parties from (i) discussing such
transactions with those Persons whose approval, agreement or opinion, as the
case may be, is required for consummation of such particular transaction or
transactions or (ii) disclosing such information about such transactions in a
registration statement or prospectus in connection with the Initial Public
Offering or (iii) if the disclosing party is a Purchaser, disclosing such
Purchaser's investment herein provided that such disclosure does not mention any
other Purchaser by name and is approved by the Company in writing. Each of the
parties acknowledge and agree that there would be no adequate remedy at Law if
it fails to perform its obligations under this Section 13 and accordingly agrees
that each of the other parties, in addition to any other remedy to which it may
be entitled at Law or in equity, shall be entitled to compel specific
performance of the obligations of the first party under this Section 13.

                  14. WAIVER. No party may waive any of the terms or conditions
of this Agreement except by a duly signed writing referring to the specific
provision to be waived.

                                                              PURCHASE AGREEMENT
                                      -15-

<PAGE>

                  15. ENTIRE AGREEMENT. This Agreement and the Related
Agreements constitute the entire agreement, and supersedes all other prior
agreements and understandings, both written and oral, among the parties hereto
and their affiliates with respect to the matters set forth herein.

                  16. SEVERABILITY. If any provision of this Agreement shall be
held invalid, illegal or unenforceable, the validity, legality or enforceability
of the other provisions hereof shall not be affected thereby, and there shall be
deemed substituted for the provision at issue a valid, legal and enforceable
provision as similar as possible to the provision at issue.

                  17. CAPTIONS. The Section references herein are for
convenience of reference only, do not constitute part of this Agreement and
shall not be deemed to limit or otherwise affect any of the provisions hereof.

                  18. COUNTERPARTS. This Agreement may be executed in one or
more counterparts, each of which shall be deemed an original but all of which
shall constitute one and the same instrument.

                  19. GOVERNING LAW. This Agreement shall be governed by, and
construed and enforced in accordance with, the laws of the State of Delaware.

                  20. WAIVER OF JURY TRIAL. THE COMPANY AND THE PURCHASERS
HEREBY WAIVE ANY RIGHT THEY MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY
ACTION, PROCEEDING OR LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF, UNDER OR
IN CONNECTION WITH THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED THEREBY.

                  21. FEES AND EXPENSES. All costs and expenses incurred in
connection with this Agreement shall be paid by the party incurring such costs
or expense.

                  22. JOINT PARTICIPATION IN DRAFTING. Each party to this
Agreement has participated in the negotiation and drafting of this Agreement. As
such, the language used herein shall be deemed to be the language chosen by the
parties hereto to express their mutual intent, and no rule of strict
construction will be applied against any party to this Agreement.

                                                              PURCHASE AGREEMENT

                                     * * * *

                                      -16-

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed and delivered as of the day and year first written above.

                             EMC INVESTMENT CORPORATION

                             By: /S/ MICHAEL J. CODY
                                 -----------------------------------------------
                             Name: MICHAEL J. CODY
                                   ---------------------------------------------
                             Title: VICE PRESIDENT, CORPORATE DEVELOPMENT
                                    --------------------------------------------
                             Shares:  1,652,893
                             Purchase Price: $20,000,005

                                                              PURCHASE AGREEMENT
<PAGE>

                             THE VAN WAGONER FUNDS

                             By: /S/ GARRETT R. VAN WAGONER
                                 -----------------------------------------------
                             Name: GARRETT R. VAN WAGONER
                                   ---------------------------------------------
                             Title: PRESIDENT
                                    --------------------------------------------
                             345 California Street
                             Suite 2450
                             San Francisco, CA 94104
                             Facsimile:
                                       -----------------------------------------
                             Shares:  826,447
                             Purchase Price: $[10,000,008]

                             VAN WAGONER CAPITAL
                             PARTNERS, L.P.

                             By: /S/ GARRETT R. VAN WAGONER
                                 -----------------------------------------------
                             Name:
                                  ----------------------------------------------
                             Title:
                                   ---------------------------------------------
                             345 California Street
                             Suite 2450
                             San Francisco, CA 94104
                             Facsimile:
                                       -----------------------------------------
                             Shares: None
                             Purchase Price: $
                                              ----------------------------------

                             VAN WAGONER CROSSOVER FUND, L.P.

                             By:/S/ GARRETT R. VAN WAGONER
                                ------------------------------------------------
                             Name:
                                  ----------------------------------------------
                             Title:
                                   ---------------------------------------------
                             345 California Street
                             Suite 2450
                             San Francisco, CA 94104
                             Facsimile:
                                       -----------------------------------------
                             Shares: None
                             Purchase Price: $
                                             -----------------------------------

                                                              PURCHASE AGREEMENT
<PAGE>

                             DRW VENTURE PARTNERS LP

                             By:  Dain Rauscher Corporation, its General Partner

                             By: /S/ MARY ZIMMER
                                 -----------------------------------------------
                             Name: MARY ZIMMER
                                   ---------------------------------------------
                             Title: DIRECTOR, DRW FINANCE ADMINISTRATION
                                    --------------------------------------------
                             60 South 6th Street
                             Minneapolis, MN 55402
                             Attn: Mary Zimmer MS 54N2
                             Facsimile:  (612) 373-1610
                                               ---------------------------------
                             Shares:  61,984
                             Purchase Price: $750,006.40

                                                              PURCHASE AGREEMENT
<PAGE>

                             MORGAN KEEGAN OPPORTUNITY FUND, L.P.

                             By:  Merchant Bankers, Inc., its
                             General Partner

                             By: /S/ MINOR PERKINS
                                 -----------------------------------------------
                             Name: MINOR PERKINS
                                   ---------------------------------------------
                             Title: VICE PRESIDENT
                                    --------------------------------------------
                             50 North Front Street, 19th Floor
                             Memphis, TN 38103
                             Facsimile:  (901) 579-4891
                             Shares:  132,000
                             Purchase Price:  $1,597,200

                             MORGAN KEEGAN EMPLOYEE
                             INVESTMENT FUND, L.P.

                             By:  Merchant Bankers, Inc., its
                             General Partner

                             By: /S/ MINOR PERKINS
                                 -----------------------------------------------
                             Name: MINOR PERKINS
                                   ---------------------------------------------
                             Title: VICE PRESIDENT
                                    --------------------------------------------
                             50 North Front Street, 19th Floor
                             Memphis, TN 38103
                             Facsimile:  (901) 579-4891
                             Shares:  33,290
                             Purchase Price:  $402,809

                                                              PURCHASE AGREEMENT
<PAGE>

                             /S/ BARBARA M. BYRNE
                             ---------------------------------------------------
                             Barbara M. Byrne
                             101 Hun Road
                             Princeton, NJ 08540
                             Shares:  8,265
                             Purchase Price:  $100,006.50

                             /S/ GREG REYE
                             ---------------------------------------------------
                             Greg Reyes
                             c/o Brocade Communication Systems
                             1745 Technology Drive
                             San Jose, CA 95110
                             Shares:  41,323
                             Purchase Price:  $500,008.30

                             /S/ WILL HERMAN
                             ---------------------------------------------------
                             Will Herman
                             8 Cobblestone Place
                             Sudbury, MA 01776
                             Shares:  2,156
                             Purchase Price:  $26,087.60

                                                              PURCHASE AGREEMENT
<PAGE>

                              COMMVAULT SYSTEMS, INC.

                              By: /S/ N. ROBERT HAMMER
                                  ----------------------------------------------
                              Name: N. ROBERT HAMMER
                                    --------------------------------------------
                              Title: CEO
                                     -------------------------------------------

                                                              PURCHASE AGREEMENT
<PAGE>

                                   SCHEDULE A

                                  SUBSIDIARIES

CommVault Systems (Canada) Inc., a Canadian corporation
CommVault Systems Mexico S de RL de CV, a Mexican company
CommVault Holding Company BV, a Netherlands company
CommVault Systems Netherlands BV, a Netherlands company

                                                              PURCHASE AGREEMENT

                                      A-1

<PAGE>

                                   SCHEDULE B

1.       Employment Agreement, dated as of January 20, 1999, between the Company
         and N. Robert Hammer, under which Mr. Hammer has received options to
         purchase common stock.

2.       Corporate Change of Control Agreements, between the Company and (i)
         Louis Miceli, (ii) Brian McAteer, (iii) Larry Cormier, (iv) Al Bunte
         and (v) David West.

3.       Stock Plan dated as of May 22, 1996, pursuant to which (i) the Company
         is authorized to issue options to purchase 9.7 million shares of its
         common stock and (ii) options to purchase 9.2 million shares of common
         stock have been granted.

4.       Preferred Stock holders have conversion rights, pursuant to the Amended
         Certificate, and preemptive rights pursuant to the Stockholders'
         Agreement, dated as of May 22, 1996 and amended as of July 23, 1998,
         between the Company and DLJ Merchant Banking Partners, L.P., DLJ
         International Partners C.V., DLJ Offshore Partners C.V., DLJ Merchant
         Banking Funding, Inc., DLJ Capital Corporation, Sprout Growth II L.P.,
         Sprout CEO Fund L.P. and certain other investors.

5.       A Warrant to purchase 39,840 shares of common stock was issued to DLJ
         Merchant Banking Partners, L.P. and certain of its Affiliates in
         connection with the Loan Agreement dated as of January 14, 2000,
         between the Company and the Lenders therein, which Warrant has been
         exercised and such shares have been issued.

6.       Purchase Agreement, dated as of August 4, 1999, between the Company and
         Comm Vault Systems International, B.V. ("CVSI") and the shareholders of
         CVSI, pursuant to which the 957,000 shares of the Company's common
         stock were in consideration for the acquisition of the business of CVSI
         by the Company.

7.       The Company entered into an agreement with Northern Concepts
         Incorporated ("NCI"), dated as of May 2000 pursuant to which 285,000
         shares of the Company's common stock was issued in consideration for
         the acquisition of the business of NCI by the Company.

8.       Preferred Stock holders have conversion rights, pursuant to the Amended
         Certificate, and preemptive rights pursuant to the Purchase Agreement,
         dated as of April 14, 2000, among the Company and Microsoft Corporation
         and certain other investors signatories thereto.

9.       A Warrant to purchase up to 2,616,933 shares of common stock was issued
         to Microsoft Corporation in connection with the Purchase Agreement
         referred to in item 8 above.

The Company may, from time to time, issue additional shares of common stock or
options or warrants to purchase its common stock in an effort to recruit new
officers and employees. Non-Preemptive Shares shall include all such options or
warrants that may be issued in the future.

                                                              PURCHASE AGREEMENT
                                      B-1

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