Document:

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                                                                   EXHIBIT 10.25

                            MASTER SECURITY AGREEMENT
                                   NO. 609111
                    DATED AS OF MARCH 31, 2006 ("AGREEMENT")

     THIS AGREEMENT is between Oxford Finance Corporation (together with its
successors and assigns, if any, "Secured Party") and ATHENAHEALTH, INC.
("Debtor"). Secured Party has an office at 133 N. Fairfax Street, Alexandria, VA
22314. Debtor is a corporation organized and existing under the laws of the
state of Delaware. Debtor's mailing address and principal place of business is
311 Arsenal Street, Watertown, MA 02472.

1.   CREATION OF SECURITY INTEREST.

     Debtor grants to Secured Party, its successors and assigns, a security
interest in and against all property listed on any collateral schedule now or in
the future annexed to or made a part of this Agreement ("Collateral Schedule"),
and in and against all additions, attachments, accessories and accessions to
such property, all substitutions, replacements or exchanges therefore, and all
insurance and/or other proceeds thereof (all such property is individually and
collectively called the "Collateral"). This security interest is given to secure
the payment and performance of all debts, obligations and liabilities of any
kind whatsoever of Debtor to Secured Party, now existing or arising in the
future, including but not limited to the payment and performance of certain
Promissory Notes from time to time identified on any Collateral Schedule
(collectively "Notes" and each a "Note"), and any renewals, extensions and
modifications of such debts, obligations and liabilities (such Notes, debts,
obligations and liabilities are called the "Indebtedness"). Debtor acknowledges
that, notwithstanding that the Note(s) may be paid in full, this Security
Agreement shall continue to secure the payment and performance of all other
debts, obligations and liabilities of any kind whatsoever of Debtor to Secured
Party, now existing or arising in the future, and that Secured Party shall be
under no obligation to release the Collateral unless and until all Indebtedness
of Debtor to Secured Party has been paid and satisfied; provided, however,
Secured Party, in its sole and exclusive discretion, may elect to release some
of the Collateral without prejudice to Secured Party's security interest in the
remaining Collateral.

2.   REPRESENTATIONS, WARRANTIES AND COVENANTS OF DEBTOR.

     Debtor represents, warrants and covenants as of the date of this Agreement
and as of the date of each Collateral Schedule that:

     (a)  Due Organization. Debtor's exact legal name is as set forth in the
          preamble of this Agreement and Debtor is, and will remain, duly
          organized, existing and in good standing under the laws of the State
          set forth in the preamble of this Agreement, has its chief executive
          offices at the location specified in the preamble, and is, and will
          remain duly qualified and licensed in every jurisdiction wherever
          necessary to carry on its business and operations, except where the
          failure to be so qualified and licensed would not reasonably be
          expected to have a material adverse effect on Debtor's financial
          condition;

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     (b)  Power and Capacity to Enter Into and Perform Obligations. Debtor has
          adequate power and capacity to enter into, and to perform its
          obligations under this Agreement, each Collateral Schedule, each Note
          and any other documents evidencing, or given in connection with, any
          of the Indebtedness (all of the foregoing are called the "Debt
          Documents");

     (c)  Due Authorization. This Agreement and the other Debt Documents have
          been duly authorized, executed and delivered by Debtor and constitute
          legal, valid and binding agreements of Debtor enforceable against
          Debtor in accordance with their terms, except to the extent that the
          enforcement of remedies may be limited under applicable bankruptcy and
          insolvency laws or general equitable principles;

     (d)  Approvals and Consents. No approval, consent or withholding of
          objections is required to be obtained by Debtor from any governmental
          authority or instrumentality with respect to the entry into or
          performance by Debtor of any of the Debt Documents, except any already
          obtained;

     (e)  No Violations or Defaults. The entry into, and performance by, Debtor
          of the Debt Documents will not (i) violate any of the organizational
          documents of Debtor or any judgment, order, law or regulation
          applicable to Debtor, or (ii) result in any breach of or constitute a
          default under any contract to which Debtor is a party, or result in
          the creation of any lien, claim or encumbrance on any of Debtor's
          property (except for liens in favor of Secured Party) pursuant to any
          indenture, mortgage, deed of trust, bank loan, credit agreement, or
          other agreement or instrument to which Debtor is a party;

     (f)  Litigation. There are no suits or proceedings pending in court or
          before any commission, board or other administrative agency against or
          affecting Debtor which could, in the aggregate, have a material
          adverse effect on Debtor, its business or operations, or its ability
          to perform its obligations under the Debt Documents, nor does Debtor
          have reason to believe that any such suits or proceedings are
          threatened;

     (g)  Solvency. The fair salable value of Debtor's assets (including
          goodwill minus disposition costs) exceeds the fair value of its
          liabilities on a going-concern basis; the Debtor is not left with
          unreasonably small capital after the transactions in this Agreement or
          any Collateral Schedule and Debtor is able to pay its debts (including
          trade debts) as they mature in the ordinary course of Debtor's
          business.

     (h)  Financial Statements Prepared In Accordance with GAAP. All financial
          statements delivered to Secured Party in connection with the
          Indebtedness have been prepared in accordance with generally accepted
          accounting principles, and since the date of the most recent financial
          statement, there has been no material adverse change in Debtor's
          financial condition;

     (i)  Use of Collateral. The Collateral is not, and will not be, used by
          Debtor for personal, family or household purposes;

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     (j)  Collateral in Good Condition and Repair. The Collateral is, and will
          remain, in good condition and repair, normal wear and tear and
          depreciation excepted, and Debtor will not be negligent in its care
          and use;

     (k)  Location of Collateral. All of the tangible Collateral is located at
          the locations set forth on each Collateral Schedule. Debtor shall give
          the Secured Party 30 days prior written notice of any relocation of
          any such tangible Collateral;

     (l)  Ownership of Collateral. Debtor is, and will remain, the sole and
          lawful owner, and in possession of, the Collateral, and has the sole
          right and lawful authority to grant the security interest described in
          this Agreement;

     (m)  Encumbrances. The Collateral is, and will remain, free and clear of
          all liens, claims and encumbrances of any kind whatsoever, except for
          Permitted Liens;

     (n)  Intellectual Property Rights. Debtor will (i) protect, defend and
          maintain the validity and enforceability of its material Intellectual
          Property and promptly advise Secured Party in writing of material
          infringements and (ii) not allow any Intellectual Property material to
          Debtor's business to be abandoned, forfeited or dedicated to the
          public without Secured Party's written consent.

     (o)  Taxes. All federal, state and local tax returns required to be filed
          by Debtor have been filed with the appropriate governmental agencies
          and all taxes due and payable by Debtor have been timely paid. Debtor
          will pay when due all taxes, assessments and other liabilities except
          as contested in good faith and by appropriate proceedings and for
          which adequate reserves have been established;

     (p)  No Defaults. No event or condition exists under any material
          agreement, instrument or document to which Debtor is a party or may be
          subject, or by which Debtor or any of its properties are bound, which
          constitutes a default or an event of default thereunder, or will, with
          the giving of notice, passage of time, or both, would constitute a
          default or event of default thereunder;

     (q)  Certification of Financial Information. All reports, certificates,
          schedules, notices and financial information submitted by Debtor to
          the Secured Party pursuant to this Agreement shall be certified as
          true and correct in all material respects as of the date thereof by
          the president or chief financial officer of Debtor; and

     (r)  Notice of Material Adverse Change. Debtor shall give the Secured Party
          prompt written notice of any event, occurrence or other matter which
          (a) has resulted or would reasonably be expected to result in a
          material adverse change in its financial condition or business
          operations, or (b) would materially impair the ability of Debtor to
          perform its obligations hereunder or under any of the other financing
          agreements to which it is a party, or (c) which would materially
          impair the ability of Secured Party to enforce the Indebtedness or
          realize upon the Collateral in accordance herewith.

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     (s)  Change in Management. Debtor shall, except with the prior written
          consent of Secured Party, upon any resignation by or removal of the
          persons holding the offices of Chief Executive Officer or Chief
          Financial Officer of Debtor, fill such offices within sixty (60) days
          with candidates reasonably acceptable to Secured Party.

     (t)  Transactions with Affiliates. Debtor shall not, without the prior
          written consent of Secured Party, directly or indirectly enter into or
          permit to exist any material transaction with any Affiliate of Debtor
          except for transactions that are in the ordinary course of Debtor's
          business, upon fair and reasonable terms that are no less favorable to
          Debtor than would be obtained in an arm's length transaction with a
          nonaffiliated Person. For the avoidance of doubt, Debtor shall be
          entitled, in its reasonable business judgment, to make regular
          compensation payments to its officers, employees, consultants, agents
          and directors.

     (u)  Audits. Debtor shall allow Secured Party to audit Debtor's Collateral
          at Debtor's expense. Such audits will be conducted no more often than
          every six (6) months unless a default has occurred and is continuing.

     (v)  Perfection Certificate. Debtor has previously delivered to the Secured
          Party a certificate signed by the Debtor and entitled "Perfection
          Certificate" (the "Perfection Certificate"). The Debtor represents and
          warrants to the Secured Party as follows: (a) the Debtor's exact legal
          name is that indicated on the Perfection Certificate and on the
          signature page hereof, (b) the Debtor is an organization of the type,
          and is organized in the jurisdiction set forth in the Perfection
          Certificate, (c) the Perfection Certificate accurately sets forth the
          Debtor's organizational identification number or accurately states
          that the Debtor has none, (d) the Perfection Certificate accurately
          sets forth the Debtor's place of business or, if more than one, its
          chief executive office, as well as the Debtor's mailing address, if
          different, (e) all other information set forth on the Perfection
          Certificate pertaining to the Debtor is accurate and complete, and (f)
          that there has been no change in any information provided in the
          Perfection Certificate since the date on which it was executed by the
          Debtor.

     (w)  Primary Account and Wire Transfer Instructions. Debtor maintains its
          Primary Account (the "Primary Operating Account") and the Wire
          Transfer Instructions for the Primary Operating Account are as
          follows:

               Silicon Valley Bank
               3003 Tasman Drive
               Santa Clara, CA 95054
               ABA No.: 121140399
               Account No.: 3300498541
               Account Name: athenahealth, Inc.

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          Debtor hereby agrees that Loans will be advanced to the account
          specified above and regularly scheduled payments will be automatically
          debited from the same account.

     (x)  Right to Invest. Debtor hereby grants to Secured Party a right (but
          not an obligation) to invest up to $750,000.00 in the Debtor's
          Subsequent Financing on the same terms, conditions and pricing offered
          to the lead investor of such financing. Debtor shall give Secured
          Party at least thirty (30) days prior written notice of such
          Subsequent Financing containing the terms, conditions and pricing of
          such Subsequent Financing. As used herein, "Subsequent Financing"
          shall mean the next round of private equity financing in which the
          Debtor receives, in the aggregate, at least $2,000,000.00 of gross
          cash proceeds (excluding any bridge debt financing except to the
          extent actually converted to equity in the Debtor).

3.   COLLATERAL.

     The Debtor, covenants and agrees that, so long as any of the Debt Documents
shall remain in effect, or unless the Secured Party shall otherwise consent in
writing:

     (a)  Possession of Collateral; Inspection of Collateral. Until the
          declaration of any default, Debtor shall remain in possession of the
          Collateral; except that Secured Party shall have the right to possess:
          (i) any chattel paper or instrument that constitutes a part of the
          Collateral, and (ii) any other Collateral in which Secured Party's
          security interest may be perfected only by possession. Secured Party
          may inspect any of the Collateral during normal business hours after
          giving Debtor reasonable prior notice.

     (b)  Maintenance of Collateral. Debtor shall (i) use the Collateral only in
          its trade or business, (ii) maintain all of the Collateral in good
          operating order and repair, normal wear and tear and depreciation
          excepted, (iii) use and maintain the Collateral only in compliance
          with manufacturers recommendations and all applicable laws, and (iv)
          keep all of the Collateral free and clear of all liens, claims and
          encumbrances (except for Permitted Liens).

     (c)  Disposition of Collateral. Secured Party does not authorize and Debtor
          agrees it shall not: (i) part with possession of any of the Collateral
          (except to Secured Party or for maintenance and repair), (ii) remove
          any of the Collateral from the continental United States, or (iii)
          sell, rent, lease, mortgage, license, grant a security interest in or
          otherwise transfer or encumber (except for Permitted Liens) any of the
          Collateral.

     (d)  Taxes. Debtor shall pay promptly when due all taxes, license fees,
          assessments and public and private charges levied or assessed on any
          of the Collateral, on its use, or on this Agreement or any of the
          other Debt Documents. At its option, Secured Party may discharge
          taxes, liens, security interests or other encumbrances at any time
          levied or placed on the Collateral and may pay for the maintenance,
          insurance and preservation of the Collateral and effect compliance
          with the terms

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          of this Agreement or any of the other Debt Documents. Debtor agrees to
          reimburse Secured Party, on demand, all costs and expenses reasonably
          incurred by Secured Party in connection with such payment or
          performance and agrees that such reimbursement obligation shall
          constitute Indebtedness.

     (e)  Books and Records. Debtor shall, at all times, keep accurate and
          complete records of the Collateral, and Secured Party shall have the
          right to inspect and make copies of all of Debtor's books and records
          relating to the Collateral during normal business hours, after giving
          Debtor reasonable prior notice.

     (f)  Third Party Possession of Collateral. Debtor agrees and acknowledges
          that any third person who may at any time possess all or any portion
          of the Collateral shall be deemed to hold, and shall hold, the
          Collateral as the agent of, and as pledge holder for, Secured Party.
          Secured Party may at any time give notice to any third person
          described in the preceding sentence that such third person is holding
          the Collateral as the agent of, and as pledge holder for, the Secured
          Party.

     (g)  Change of Address, Name or Jurisdiction. The Debtor has not at any
          time within the past four (4) months either changed its name or
          changed the state of jurisdiction in which it is organized and
          existing, nor has it maintained its chief executive office or any of
          the Collateral at any other location, except as set forth above, and
          shall not do so hereafter except upon prior written notice to the
          Secured Party. The Secured Party shall be entitled to rely upon the
          foregoing unless it receives 14 days' advance written notice of a
          change in the Debtor's name, state of jurisdiction, address of the
          Debtor's chief executive offices or location of the Collateral.

     (h)  Fixtures. Not permit any item of the Collateral to become a fixture to
          real estate or an accession to other property without the prior
          written consent of the Secured Party, and the Collateral is now and
          shall at all times remain personal property except with the Secured
          Party's prior written consent. If any of the Collateral is or will be
          attached to real estate in such a manner as to become a fixture under
          applicable state law and if such real estate is encumbered, the Debtor
          will obtain from the holder of each Lien or encumbrance a written
          consent and subordination to the security interest hereby granted, or
          a written disclaimer of any interest in the Collateral, in a form
          reasonably acceptable to the Secured Party.

     (i)  Distributions. Debtor shall not (i) pay any dividends or make any
          distributions on its equity securities; (ii) purchase, redeem, retire,
          defease or otherwise acquire for value any of its equity securities
          (other than repurchases pursuant to the terms of employee stock
          purchase plans, employee restricted stock agreements or similar
          arrangements in an aggregate amount not to exceed Two Hundred Fifty
          Thousand Dollars ($250,000) in any fiscal year); (iii) return any
          capital to any holder of its equity securities as such; (iv) make any
          distribution of assets, equity securities, obligations or securities
          to any holder of its equity securities as such; or (v) set apart any
          sum for any such purpose; provided however, Debtor may pay dividends
          payable solely in common stock.

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     (j)  Indebtedness Payments. Debtor shall not (i) prepay, redeem, purchase,
          defease or otherwise satisfy in any manner prior to the scheduled
          repayment thereof any Additional Indebtedness for borrowed money or
          lease obligations, (ii) amend, modify or otherwise change the terms of
          any Additional Indebtedness for borrowed money or lease obligations so
          as to accelerate the scheduled repayment thereof or (iii) repay any
          notes to officers, directors or shareholders except as expressly
          provided for in a duly executed subordination agreement in favor of
          and approved by Secured Party.

     (k)  Additional Indebtedness. Debtor shall not create, incur, assume or
          permit to exist any Additional Indebtedness except Permitted
          Indebtedness.

4.   INSURANCE.

     (a)  Risk of Loss. Debtor shall at all times bear the entire risk of any
          loss, theft, damage to, or destruction of, any of the Collateral not
          in Secured Party's possession from any cause whatsoever.

     (b)  Insurance Requirements. Debtor agrees to keep the Collateral insured
          against loss or damage by fire and extended coverage perils, theft,
          burglary, and for any or all Collateral, which are vehicles, for risk
          of loss by collision, and if requested by Secured Party, against such
          other risks as Secured Party may reasonably require. The insurance
          coverage shall be in an amount no less than the full replacement value
          of the Collateral, and deductible amounts, insurers and policies shall
          be reasonably acceptable to Secured Party. Debtor shall deliver to
          Secured Party upon its request any policies and certificates of
          insurance evidencing such coverage as may be reasonably requested by
          Secured Party. Each policy shall name Secured Party as a loss payee,
          shall provide for coverage to Secured Party regardless of the breach
          by Debtor of any warranty or representation made therein, shall not be
          subject to co-insurance, and shall provide that coverage may not be
          canceled or altered by the insurer except upon thirty (30) days prior
          written notice to Secured Party. Debtor appoints Secured Party as its
          attorney-in-fact to make proof of loss, claim for insurance and
          adjustments with insurers, and to receive payment of and execute or
          endorse all documents, checks or drafts in connection with insurance
          payments. Secured Party shall not exercise such power to act as
          Debtor's attorney-in-fact unless Debtor is in default hereunder. If
          Debtor is in default hereunder, proceeds of insurance shall be
          applied, at the option of Secured Party, to repair or replace the
          Collateral or to reduce any of the Indebtedness.

5.   REPORTS.

     (a)  Notice of Events. Debtor shall promptly notify Secured Party of (i)
          any change in the name of Debtor, (ii) any change in the state of its
          incorporation or registration, (iii) any relocation of its chief
          executive offices, (iv) any of the Collateral being lost, stolen,
          missing, destroyed, materially damaged or worn out, (v) any lien,
          claim or encumbrance other than Permitted Liens attaching to or being
          made

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          against any of the Collateral, or (vi) any occurrence of any default
          pursuant to Section 7 herein.

     (b)  Financial Statements, Reports and Certificates. Debtor will deliver to
          Secured Party within one hundred eighty (180) days of the close of
          each fiscal year of Debtor, Debtor's complete financial statements
          including a balance sheet, income statement, statement of
          shareholders' equity and statement of cash flows, each prepared in
          accordance with generally accepted accounting principles consistently
          applied, certified by a recognized firm of certified public
          accountants satisfactory to Secured Party (it being agreed that
          Debtor's current accountants are satisfactory to Secured Party
          hereunder). Debtor will deliver to Secured Party copies of Debtor's
          quarterly financial statements including a balance sheet, income
          statement and statement of cash flows, each prepared by Debtor in
          accordance with generally accepted accounting principles consistently
          applied by Debtor and certified by Debtor's chief financial officer,
          within forty-five (45) days after the close of each of Debtor's fiscal
          quarter. Debtor will deliver to Secured Party copies of all Forms 10-K
          and 10-Q, if any, within 30 days after the dates on which they are
          filed with the Securities and Exchange Commission. Debtor will deliver
          to Secured Party copies of Debtor's monthly financial statements
          including a balance sheet and income statement, and statement of
          cashflows, each prepared by Debtor in accordance with generally
          accepted accounting principles consistently applied by Debtor and
          certified by Debtor's chief financial officer, within thirty (30) days
          after the close of each month. Concurrently with delivery of the
          foregoing information, and from time to time promptly upon the
          reasonable request of Secured Party, Debtor will deliver to Secured
          Party a Compliance Certificate substantially consistent with the form
          of the document attached hereto as Schedule A. Debtor will deliver to
          Secured Party promptly upon request of Secured Party, in form
          reasonably satisfactory to Secured Party, such other and additional
          information as Secured Party may reasonably request from time to time.

6.   FURTHER ASSURANCES.

     (a)  Further Assurances Regarding Security Interests. Debtor shall, upon
          request of Secured Party, furnish to Secured Party such further
          information, execute and deliver to Secured Party such documents and
          instruments and shall do such other acts and things as Secured Party
          may at any time reasonably request relating to the perfection or
          protection of the security interest created by this Agreement or for
          the purpose of carrying out the intent of this Agreement. Without
          limiting the foregoing, Debtor shall cooperate and do all acts deemed
          necessary or advisable by Secured Party to continue in Secured Party a
          perfected first security interest in the Collateral, and shall obtain
          and furnish to Secured Party any subordinations, releases, landlord
          waivers, lessor waivers, mortgagee waivers, or control agreements, and
          similar documents as may be from time to time reasonably requested by,
          and in form and substance reasonably satisfactory to, Secured Party.

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     (b)  Authorization To File Financing Statements. Debtor shall perform any
          and all acts requested by the Secured Party to establish, maintain and
          continue the Secured Party's security interest and liens in the
          Collateral, including but not limited to, executing or authenticating
          such instruments and documents when and as reasonably requested by the
          Secured Party. Debtor hereby authorizes Secured Party through any of
          Secured Party's employees, agents or attorneys to file any and all
          financing statements, including, without limitation, any original
          filings, continuations, transfers or amendments thereof required to
          perfect Secured Party's security interest and liens in the Collateral
          under the UCC without authentication or execution by Debtor. Debtor
          hereby irrevocably authorizes the Secured Party at any time and from
          time to time to file in any filing office in any Uniform Commercial
          Code jurisdiction any initial financing statement(s) and amendments
          thereto that (a) indicate the Collateral (i) is subject to Secured
          Party's security interest, regardless of whether any particular asset
          comprised in the Collateral falls within the scope of Article 9 of the
          Uniform Commercial Code of the State or such jurisdiction, or (ii) as
          being of an equal or lesser scope or with greater detail, and (b)
          provide any other information required by part 5 of Article 9 of the
          Uniform Commercial Code of the State or such other jurisdiction for
          the sufficiency or filing office acceptance of any financing statement
          or amendment, including (i) whether the Debtor is an organization, the
          type of organization and any organization identification number issued
          to the Debtor, and (ii) in the case of a financing statement filed as
          a fixture filing, a sufficient description of real property to which
          the Collateral relates. The Debtor agrees to furnish any such
          information to the Secured Party promptly upon the Secured Party's
          reasonable request.

     (c)  Indemnification. Debtor shall indemnify and defend the Secured Party,
          its successors and assigns, and their respective directors, officers
          and employees, from and against all claims, actions and suits
          (including, without limitation, related attorneys' fees) of any kind
          whatsoever arising, directly or indirectly, in connection with any of
          the Collateral or the Debt Documents, provided that Debtor shall have
          no obligation to indemnify or defend the Secured Party, its successors
          and assigns, and their respective directors, officers and employees,
          from and against any claims, actions and suits arising from the
          Secured Party's gross negligence or willful misconduct, or any breach
          of any Debt Document caused by the gross negligence or willful
          misconduct of Secured Party, its successors and assigns, or their
          respective directors, officers or employees.

7.   DEFAULT AND REMEDIES.

     (a)  Defaults. Debtor shall be in default under this Agreement and each of
          the other Debt Documents if any one of the following should occur:

          (i)  Debtor breaches its obligation to pay when due any installment or
               other amount due or coming due under any of the Debt Documents;

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          (ii) Debtor, without the prior written consent of Secured Party,
               attempts to or does sell, rent, lease, license, mortgage, grant a
               security interest in, or otherwise transfer or encumber, or allow
               Liens (except for Permitted Liens) upon, any of the Collateral;

          (iii) Debtor breaches any of its insurance obligations under Section 4

          (iv) Debtor breaches any of its obligations under Sections 2(m) or
               2(x), or Sections 3(i), (j), or (k);

          (v)  Debtor breaches any of its other non-payment obligations either
               under any of the Debt Documents or any other financing
               arrangement between Debtor and a third party and fails to cure
               that breach within thirty (30) days after it has occurred;

          (vi) Any warranty, representation or statement made by Debtor in any
               of the Debt Documents or otherwise in connection with any of the
               Indebtedness shall be false or misleading in any material
               respect;

          (vii) Any of the Collateral is subjected to attachment, execution,
               levy, seizure or confiscation in any legal proceeding or
               otherwise, or if any legal or administrative proceeding is
               commenced against Debtor or any of the Collateral, which in the
               reasonable judgment of Secured Party subjects any of the
               Collateral to a material risk of attachment, execution, levy,
               seizure or confiscation and no bond is posted or protective order
               obtained to negate such risk;

          (viii) Debtor breaches or is in default under any other agreement
               between Debtor and Secured Party;

          (ix) Debtor or any guarantor or other obligor for any of the
               Indebtedness (collectively "Guarantor") dissolves, terminates its
               existence, becomes insolvent or ceases to do business as a going
               concern;

          (x)  If Debtor or any Guarantor is a natural person, and Debtor or any
               such Guarantor dies or becomes incompetent;

          (xi) A receiver is appointed for all or of any part of the property of
               Debtor or any Guarantor, or Debtor or any Guarantor makes any
               assignment for the benefit of creditors;

          (xii) Debtor or any Guarantor files a petition under any bankruptcy,
               insolvency or similar law, or any such petition is filed against
               Debtor or any Guarantor and is not dismissed within sixty (60)
               days;

          (xiii) Debtor's improper filing of an amendment or termination
               statement relating to a filed financing statement describing the
               Collateral;

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          (xiv) Debtor shall merge with or consolidate into any other entity or
               sell all or substantially all of its assets or in any manner
               terminate its existence;

          (xv) If Debtor is a privately held corporation, more than 50% of
               Debtor's voting capital stock issued and outstanding from time to
               time, is not retained by the holders of such stock on the date
               the Agreement is executed or their affiliates;

          (xvi) If Debtor is a publicly held corporation, there shall be a
               change in the ownership of Debtor's stock such that Debtor is no
               longer subject to the reporting requirements of the Securities
               Exchange Act of 1934 or no longer has A class of equity
               securities registered under Section 12 of the Securities Act of
               1933;

          (xvii) Debtor defaults on any payment obligation in an amount in
               excess of $250,000 under: (a) any agreement to pay Additional
               Indebtedness, or (b) any other financing arrangement between
               Debtor and a third party; ;

          (xviii) There is a material impairment in the perfection or priority
               of the Secured Party's security interest in the Collateral or

          (xix) There has been a material adverse change in the financial
               condition or business operations of Debtor from the date hereof,
               or a change or event shall have occurred which would materially
               impair the ability of Debtor to perform its obligations hereunder
               or under any of the other financing agreements to which it is a
               party or of Secured Party to enforce the Indebtedness or realize
               upon the collateral in accordance herewith.

     (b)  Acceleration. If Debtor is in default, the Secured Party, at its
          option, may declare any or all of the Indebtedness to be immediately
          due and payable, without demand or notice to Debtor or any Guarantor
          (provided that if there is a default as a result of a bankruptcy or
          insolvency all Indebtedness shall become immediately due and payable
          without any action by Secured Party). The accelerated obligations and
          liabilities shall bear interest (both before and after any judgment)
          until paid in full at the Default Rate.

     (c)  Rights and Remedies. Secured Party shall have all of the rights and
          remedies of a Secured Party under the Uniform Commercial Code, and
          under any other applicable law. Without limiting the foregoing,
          Secured Party shall have the right in accordance with applicable law
          to (i) notify any account debtor of Debtor or any obligor on any
          instrument which constitutes part of the Collateral to make payment to
          the Secured Party, (ii) with or without legal process, peaceably enter
          any premises where the Collateral may be and take possession of and
          remove the Collateral from the premises or store it on the premises,
          (iii) sell the Collateral at public or private sale, in whole or in
          part, and have the right to bid and purchase at said sale, or (iv)
          lease or otherwise dispose of all or part of the Collateral, applying
          proceeds from such disposition to the obligations then in default. If

                                       11

<PAGE>

          requested by Secured Party, Debtor shall promptly assemble the
          Collateral and make it available to Secured Party at a place to be
          designated by Secured Party, which is reasonably convenient to both
          parties. Secured Party may also render any or all of the Collateral
          unusable at the Debtor's premises and may dispose of such Collateral
          on such premises without liability to Debtor for rent or costs. Any
          notice that Secured Party is required to give to Debtor under the
          Uniform Commercial Code of the time and place of any public sale or
          the time after which any private sale or other intended disposition of
          the Collateral is to be made shall be deemed to constitute reasonable
          notice if such notice is given to the last known address of Debtor at
          least ten (10) days prior to such action. Upon the occurrence and
          during the continuation of a default, Debtor hereby appoints Secured
          Party as Debtor's attorney-in-fact, with full authority in Debtor's
          place and stead and in Debtor's name or otherwise, from time to time
          in Secured Party's sole discretion, to take any action and to execute
          any instrument which Secured Party may deem necessary or advisable to
          accomplish the purpose of this Agreement. Secured Party is granted a
          non-exclusive royalty free license to use Debtor's Intellectual
          Property in connection with Secured Party's disposition of Collateral
          in the exercise of Secured Party's rights or remedies hereunder.

     (d)  Application of Proceeds. The proceeds and/or avails of the Collateral,
          or any part thereof, and the proceeds and the avails of any remedy
          hereunder (as well as any other amounts of any kind held by Secured
          Party, at the time of or received by Secured Party after the
          occurrence and during the continuance of a default hereunder) shall be
          paid to and applied as follows:

          a.   First, to the payment of out-of-pocket costs and expenses,
               including all amounts expended to preserve the value of the
               Collateral, all costs of repossession, storage, and disposition
               including without limitation attorneys', appraisers', and
               auctioneers' fees, of foreclosure or suit, if any, and of such
               sale and the exercise of any other rights or remedies, and of all
               proper fees, expenses, liability and advances, including
               reasonable legal expenses and attorneys' fees, incurred or made
               hereunder by Secured Party, including without limitation, Secured
               Party's Expenses;

          b.   Second to the payment to Secured Party of the amount then owing
               or unpaid on the Loans for scheduled payments, any accrued and
               unpaid interest, and all other Indebtedness (provided, however if
               such proceeds shall be insufficient to pay in full the whole
               amount so due, owing or unpaid upon the Loans, then to the unpaid
               interest thereon, then to the outstanding principal amount of the
               Loans, and then to the payment of other amounts then payable to
               Secured Party under any of the Debt Documents or otherwise); and

          c.   Third, to the payment of the surplus, if any, to Debtor, its
               successors and assigns, or to whomever may be lawfully entitled
               to receive the same.

     (e)  Fees and Costs. Debtor agrees to pay all reasonable attorneys' fees
          and other costs incurred by Secured Party in connection with the
          enforcement, assertion, defense or preservation of Secured Party's
          rights and remedies under this

                                       12

<PAGE>

          Agreement, or if prohibited by law, such lesser sum as may be
          permitted. Debtor further agrees that such fees and costs shall
          constitute Indebtedness.

     (f)  Remedies Cumulative. Secured Party's rights and remedies under this
          Agreement or otherwise arising are cumulative and may be exercised
          singularly or concurrently. Neither the failure nor any delay on the
          part of the Secured Party to exercise any right, power or privilege
          under this Agreement shall operate as a waiver, nor shall any single
          or partial exercise of any right, power or privilege preclude any
          other or further exercise of that or any other right, power or
          privilege. SECURED PARTY SHALL NOT BE DEEMED TO HAVE WAIVED ANY OF ITS
          RIGHTS UNDER THIS AGREEMENT OR UNDER ANY OTHER AGREEMENT, INSTRUMENT
          OR PAPER SIGNED BY DEBTOR UNLESS SUCH WAIVER IS EXPRESSED IN WRITING
          AND SIGNED BY SECURED PARTY. A waiver on any one occasion shall not be
          construed as a bar to or waiver of any right or remedy on any future
          occasion.

     (g)  WAIVER OF JURY TRIAL. DEBTOR AND SECURED PARTY UNCONDITIONALLY WAIVE
          THEIR RIGHTS TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED
          UPON OR ARISING OUT OF THIS AGREEMENT, ANY OF THE OTHER DEBT
          DOCUMENTS, ANY OF THE INDEBTEDNESS SECURED HEREBY, ANY DEALINGS
          BETWEEN DEBTOR AND SECURED PARTY RELATING TO THE SUBJECT MATTER OF
          THIS TRANSACTION OR ANY RELATED TRANSACTIONS, AND/OR THE RELATIONSHIP
          THAT IS BEING ESTABLISHED BETWEEN DEBTOR AND SECURED PARTY. THE SCOPE
          OF THIS WAIVER IS INTENDED TO BE ALL ENCOMPASSING OF ANY AND ALL
          DISPUTES THAT MAY BE FILED IN ANY COURT. THIS WAIVER IS IRREVOCABLE.
          THIS WAIVER MAY NOT BE MODIFIED EITHER ORALLY OR 1N WRITING. THE
          WAIVER ALSO SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS, RENEWALS,
          SUPPLEMENTS OR MODIFICATIONS TO THIS AGREEMENT, ANY OTHER DEBT
          DOCUMENTS, OR TO ANY OTHER DOCUMENTS OR AGREEMENTS RELATING TO THIS
          TRANSACTION OR ANY RELATED TRANSACTION. THIS AGREEMENT MAY BE FILED AS
          A WRITTEN CONSENT TO A TRIAL BY THE COURT.

8.   MISCELLANEOUS.

     (a)  Assignment. This Agreement and/or any of the other Debt Documents may
          be assigned, in whole or in part, by Secured Party upon notice to the
          Debtor, and Debtor agrees not to assert against any such assignee, or
          assignee's assigns, any defense, set-off, recoupment claim or
          counterclaim which Debtor has or may at any time have against Secured
          Party for any reason whatsoever. Debtor agrees that if Debtor receives
          written notice of an assignment from Secured Party, Debtor will pay
          all amounts payable under any assigned Debt Documents to such assignee
          or as instructed by Secured Party. Debtor also agrees to confirm in
          writing receipt of the notice of assignment as may be reasonably
          requested by Secured Party or assignee.

                                       13

<PAGE>

     (b)  Notices. All notices to be given in connection with this Agreement
          shall be in writing, shall be addressed to the parties at their
          respective addresses set forth in this Agreement (unless and until a
          different address may be specified in a written notice to the other
          party), and shall be deemed given (i) on the date of receipt if
          delivered in hand or by facsimile transmission, (ii) on the next
          business day after being sent by express mail or overnight delivery
          service, and (iii) on the fourth business day after being sent by
          regular, registered or certified mail. As used herein, the term
          "business day" shall mean and include any day other than Saturdays,
          Sundays, or other days on which commercial banks in New York, New York
          are required or authorized to be closed.

     (c)  Correction of Errors. Secured Party may correct patent errors and fill
          in all blanks in this Agreement, any Collateral Schedule or in any
          Note consistent with the agreement of the parties.

     (d)  Time is of the Essence. Time is of the essence of this Agreement. This
          Agreement shall be binding, jointly and severally, upon all parties
          described as the "Debtor" and their respective heirs, executors,
          representatives, successors and assigns, and shall inure to the
          benefit of Secured Party, its successors and assigns.

     (e)  Entire Agreement. This Agreement and the Debt Documents constitute the
          entire agreement between the parties with respect to the subject
          matter of this Agreement and supersede all prior understandings
          (whether written, verbal or implied) with respect to such subject
          matter. NEITHER THIS AGREEMENT NOR ANY OF THE DEBT DOCUMENTS SHALL BE
          CHANGED OR TERMINATED ORALLY OR BY COURSE OF CONDUCT, BUT ONLY BY A
          WRITING SIGNED BY BOTH PARTIES. Section headings contained in this
          Agreement have been included for convenience only, and shall not
          affect the construction or interpretation of this Agreement. This
          Agreement is the result of negotiations between and has been reviewed
          by each of Debtor and Secured Party executing this Agreement as of the
          date hereof and their respective counsel; accordingly, this Agreement
          shall be deemed to be the product of the parties hereto, and no
          ambiguity shall be construed in favor of or against Debtor or Secured
          Party.

     (f)  Termination of Agreement. This Agreement shall continue in full force
          and effect until all of the Indebtedness has been indefeasibly paid in
          full to Secured Party or its assignee; provided, that Debtor's
          indemnity obligations set forth in Section 6(c) shall survive until
          all applicable statute of limitations periods with respect to actions
          that may be brought against Secured Party have run. The surrender,
          upon payment or otherwise, of any Note or any of the other documents
          evidencing any of the Indebtedness shall not affect the right of
          Secured Party to retain the Collateral for such other Indebtedness as
          may then exist or as it may be reasonably contemplated will exist in
          the future. This Agreement shall automatically be reinstated if
          Secured Party is ever required to return or restore the payment of all
          or any portion of the Indebtedness (all as though such payment had
          never been made). Secured Party shall, at Debtor's sole cost and
          expense,

                                       14

<PAGE>

          execute such further documents and take such further actions as may be
          reasonably necessary to effect the release of its security interests
          contemplated by this paragraph, including duly executing and
          delivering termination statements for filing in all relevant
          jurisdictions under the Code.

     (g)  CHOICE OF LAW. DEBTOR AGREES THAT SECURED PARTY AND/OR ITS SUCCESSORS
          AND ASSIGNS SHALL HAVE THE OPTION BY WHICH STATE LAWS THIS AGREEMENT
          SHALL BE GOVERNED AND CONSTRUED: (A) THE LAWS OF THE COMMONWEALTH OF
          VIRGINIA; OR (B) IF COLLATERAL HAS BEEN PLEDGED TO SECURE THE
          LIABILITIES, THEN BY THE LAWS OF THE STATE OR STATES WHERE THE
          COLLATERAL IS LOCATED, AT SECURED PARTY'S OPTION. THIS CHOICE OF STATE
          LAWS IS EXCLUSIVE TO THE SECURED PARTY. DEBTOR SHALL NOT HAVE ANY
          OPTION TO CHOOSE THE LAWS BY WHICH THIS AGREEMENT SHALL BE GOVERNED.
          DEBTOR ACKNOWLEDGES THAT THIS AGREEMENT IS BEING SIGNED BY THE SECURED
          PARTY IN PARTIAL CONSIDERATION OF SECURED PARTY'S RIGHT TO ENFORCE IN
          THE JURISDICTION STATED ABOVE. DEBTOR CONSENTS TO JURISDICTION IN THE
          COMMONWEALTH OF VIRGINIA OR THE STATE IN WHICH ANY COLLATERAL [S
          LOCATED AND VENUE IN ANY FEDERAL OR STATE COURT IN THE COMMONWEALTH OF
          VIRGINIA OR THE STATE IN WHICH COLLATERAL IS LOCATED FOR SUCH PURPOSES
          AND WAIVES ANY AND ALL RIGHTS TO CONTEST SAID JURISDICTION AND VENUE
          AND ANY OBJECTION THAT SAID COUNTY IS NOT CONVENIENT. DEBTOR WAIVES
          ANY RIGHTS TO COMMENCE ANY ACTION AGAINST SECURED PARTY IN ANY
          JURISDICTION EXCEPT VIRGINIA, OR IF SECURED PARTY CHOOSES TO LITIGATE
          IN A STATE WHERE COLLATERAL IS LOCATED THEN IN SUCH COUNTY AND STATE.

     (h)  Power of Attorney. To facilitate direct collection, the Debtor hereby
          appoints the Secured Party and any officer or employee of the Secured
          Party, as the Secured Party may from time to time designate, as
          attorney-in-fact for the Debtor to (a) endorse the name of the Debtor
          in favor of the Secured Party upon any and all checks, drafts, money
          orders, notes, acceptances or other evidences of payment or Collateral
          that may come into the Secured Party's possession; (b) do all acts and
          things necessary to carry out this Agreement and the transactions
          contemplated hereby, including signing the name of the Debtor on any
          instruments required by law in connection with the transactions
          contemplated hereby and on financing statements as permitted by the
          Virginia Uniform Commercial Code. Neither the Secured Party nor any
          other such attorney-in-fact shall be liable for any acts of commission
          or omission, or for any error of judgment or mistake of fact or law of
          any such attorney-in-fact. This power, being coupled with an interest,
          is irrevocable so long as the Loan remains unsatisfied, or any Debt
          Document remains effective. Secured Party shall not exercise such
          power to act as Debtor's attorney-in-fact unless Debtor is in default
          hereunder.

                                       15

<PAGE>

     (i)  Loss, Depreciation or Other Damage. The Secured Party shall not be
          liable for or prejudiced by any loss, depreciation or other damage to
          Collateral unless caused by the Secured Party's willful and malicious
          act, and the Secured Party shall have no duty to take any action to
          preserve or collect any Collateral.

     (j)  Demand; Protest. Debtor waives demand, protest, notice of protest,
          notice of default or dishonor, notice of payment and nonpayment,
          notice of any default, nonpayment at maturity, release, compromise,
          settlement, extension, or renewal of accounts, documents, instruments,
          chattel paper, and guarantees at any time held by Secured Party on
          which Debtor may in any way be liable.

9.   DEFINITIONS.

     As used herein, the following terms, when initial capital letters are used,
shall have the respective meanings set forth below. In addition, all terms
defined in the Code shall have the meanings given therein unless otherwise
defined herein.

Defined Terms. As used in this Agreement, the following terms shall have the
following meanings, unless the context otherwise requires:

     "Additional Indebtedness" means, with respect to Debtor or any of its
     subsidiaries , the aggregate amount of, without duplication, (a) all
     obligations of such Person for borrowed money, (b) all obligations of such
     Person evidenced by bonds, debentures, notes or other similar instruments,
     (c) all obligations of such Person to pay the deferred purchase price of
     property or services (excluding trade payables aged less than one hundred
     eighty (180) days), (d) all capital lease obligations of such Person, (e)
     all obligations or liabilities of others secured by a Lien on any asset of
     such Person, whether or not such obligation or liability is assumed, (f)
     all obligations or liabilities of others guaranteed by such Person, and (g)
     any other obligations or liabilities which are required by GAAP to be shown
     as debt on the balance sheet of such Person. Unless otherwise indicated,
     the term "Additional Indebtedness" shall include all Indebtedness of Debtor
     and all of its subsidiaries.

     "Affiliate" of a Person is a Person that owns or controls directly or
     indirectly the Person, any Person that controls or is controlled by or is
     under common control with the Person, and each of that Person's senior
     executive officers, directors, partners and, for any Person that is a
     limited liability company, that Person's managers and members.

     "Code" means the Virginia Uniform Commercial Code (including revised
     Article 9 thereof). "Collateral" has the meaning given such capitalized
     term in Section 1.

     "Collateral Schedule" has the meaning given such capitalized term in
     Section 1.

     "Debt Documents" has the meaning given such capitalized term in Section
     2(b).

     "Default Rate" is the lower of eighteen percent (18%) per annum or the
     maximum rate not prohibited by applicable law.

                                       16

<PAGE>

     "Indebtedness" has the meaning given such capitalized term in Section I.

     "Intellectual Property" shall mean (a) all of the Debtor's right, title and
     interest, whether now owned or existing or hereafter acquired or arising,
     in and to all domestic and foreign copyrights, copyright registrations and
     copyright applications, whether or not registered or filed with any
     governmental authority, together with (i) all renewals thereof, (ii) all
     present and future rights of the Debtor under all present and future
     license agreements relating thereto, whether the Debtor is licensee or
     licensor thereunder, (iii) all income, royalties, damages and payments now
     or hereafter due and/or payable to the Debtor thereunder or with respect
     thereto, including, without limitation, damages and payments for past,
     present or future infringements thereof, (iv) all of the Debtor's present
     and future claims, causes of action and rights to sue for past, present or
     future infringements thereof, and (v) all rights corresponding thereto
     throughout the world (collectively "Copyright Rights"); (I)) all of the
     Debtor's right, title and interest, whether now owned or existing or
     hereafter acquired or arising, in and to all United States and foreign
     patents, and pending and abandoned United States and foreign patent
     applications, including, without limitation, the inventions and
     improvements described or claimed therein, together with(i) any reissues,
     divisions, continuations, certificates of re-examination, extensions and
     continuations-in-part thereof, (ii) all present and future rights of the
     Debtor under all present and future license agreements relating thereto,
     whether the Debtor is licensee or licensor thereunder, (iii) all income,
     royalties, damages and payments now or hereafter due and/or payable to the
     Debtor thereunder or with respect thereto, including, without limitation,
     damages and payments for past, present or future infringements thereof,
     (iv) all of the Debtor's present and future claims, causes of action and
     rights to sue for past, present or future infringements thereof, and (v)
     all rights corresponding thereto throughout the world (collectively "Patent
     Rights"); (c) all of the Debtor's right, title and interest, whether now
     owned or existing or hereafter acquired or arising, in and to all domestic
     and foreign trademarks, trademark registrations, trademark applications and
     trade names, whether or not registered or filed with any governmental
     authority, together with (i) all renewals thereof, (ii) all present and
     future rights of the Debtor under all present and future license agreements
     relating thereto, whether the Debtor is licensee or licensor thereunder,
     (iii) all income, royalties, damages and payments now or hereafter due
     and/or payable to the Debtor thereunder or with respect thereto, including,
     without limitation, damages and payments for past, present or future
     infringements thereof, (iv) all of the Debtor's present and future claims,
     causes of action and rights to sue for past, present or future
     infringements thereof, and (v) all rights corresponding thereto throughout
     the world (collectively "Trademark Rights"); (d) all present and future
     licenses and license agreements of the Debtor, and all rights of the Debtor
     under or in connection therewith, whether the Debtor is licensee or
     licensor thereunder, including, without limitation, any present or future
     franchise agreements under which the Debtor is franchisee or franchisor,
     together with (i) all renewals thereof, (ii) all income, royalties, damages
     and payments now or hereafter due and/or payable to the Debtor thereunder
     or with respect thereto, including, without limitation, damages and
     payments for past, present or future infringements thereof, (iii) all
     claims, causes of action and rights to sue for past, present or future
     infringements thereof, and (iv) all rights corresponding thereto throughout
     the world (collectively "License Rights"); (e) all present and future trade

                                       17

<PAGE>

     secrets of the Debtor; and (f) all other present and future intellectual
     property of the Debtor.

     "Lien(s)" shall mean any voluntary or involuntary mortgage, pledge, deed of
     trust, assignment, security interest, encumbrance, hypothecation, lien, or
     charge of any kind (including any conditional sale or other title retention
     agreement, any financing lease having substantially the same economic
     effect as any of the foregoing, and the filing of, or agreement to give,
     any financing statement under the Uniform Commercial Code or comparable law
     of any jurisdiction).

     "Loan" means an advance of credit by Secured Party to Debtor.

     "Note" has the meaning given such capitalized term in Section 1.

     "Permitted Indebtedness" means and includes: (i) Indebtedness of Debtor to
     Secured Party, (ii) Additional Indebtedness arising from the endorsement of
     instruments in the ordinary course of business, (iii) Additional
     Indebtedness existing on the date hereof and set forth in Schedule B and
     any extension, renewal or refinancing thereof, and further subject to the
     limitations set forth in clause (vi) below, (iv) Subordinated Indebtedness,
     (v) Additional Indebtedness secured by Liens permitted under clause (vi) of
     the definition of Permitted Liens, (vi) Debtor's revolving credit facility
     with Silicon Valley Bank that is the subject of that certain Loan and
     Security Agreement ("SVB Revolver Agreement") dated as of August 20, 2002,
     as amended between Debtor and Silicon Valley Bank or any refinancing
     thereof with another lender, but only to the extent that the principal
     amount outstanding under the SVB Revolver Agreement does not at any time
     exceed $15,000,000, and (vii) any future debt obligations incurred by
     Debtors' subsidiary, Athena Net India Private Limited, but only to the
     extent that the principal amount outstanding does not exceed US$500,000.

     "Permitted Liens" means: (i) liens in favor of Secured Party, (ii) liens
     for taxes not yet due or for taxes being contested in good faith and which
     do not involve, in the judgment of Secured Party, any risk of the sale,
     forfeiture or loss of any of the Collateral, (iii) inchoate material men's,
     mechanic's, repairmen's and similar liens arising by operation of law in
     the normal course of business for amounts which are not delinquent, [and
     (iv) Liens existing on the date hereof and set forth in Schedule B and any
     continuations or assignments thereof, (v) non-exclusive licenses of
     Intellectual Property in the ordinary course of business, and (vi) Liens
     upon any Equipment acquired by Debtor after the date hereof to secure (i)
     the purchase price of such equipment or other personal property, or (ii)
     lease obligations or indebtedness incurred solely for the purpose of
     financing the acquisition of such Equipment; provided that (A) such Liens
     are confined solely to the Equipment so acquired and the amount secured
     does not exceed the acquisition price thereof, and (B) no such Lien shall
     be created, incurred, assumed or suffered to exist in favor of Debtor's
     officers, directors or shareholders holding five percent (5%) or more of
     Debtor's equity securities.

     "Person" is any individual, sole proprietorship, partnership, limited
     liability company, joint venture, company association, trust,
     unincorporated organization, association,

                                       18

<PAGE>

     corporation, institution, public benefit corporation, firm, joint stock
     company, estate, entity or government agency.

     "Primary Operating Account" has the meaning given such capitalized term in
     Section 2(w).

     "Secured Party's Expenses" means all reasonable documented costs or
     expenses (including reasonable documented attorneys' fees and expenses)
     incurred in connection with the preparation, negotiation, documentation,
     administration and funding of the Debt Documents; and Secured Party's
     reasonable documented attorneys' fees, costs and expenses incurred in
     amending, modifying, enforcing or defending the Debt Documents (including
     fees and expenses of appeal or review), including the exercise of any
     rights or remedies afforded hereunder or under applicable law, whether or
     not suit is brought, whether before or after bankruptcy or insolvency,
     including without limitation all fees and costs reasonably incurred by
     Secured Party in connection with Secured Party's enforcement of its rights
     in a bankruptcy or insolvency proceeding filed by or against Debtor or its
     property.

     "Subordinated Indebtedness" means Additional Indebtedness subordinated to
     the Indebtedness of Debtor to Secured Party on terms and conditions
     acceptable to Secured Party in its sole discretion.

     "Subsequent Financing" has the meaning given such capitalized term in
     Section 2(x).

                                       19

<PAGE>

     IN WITNESS WHEREOF, Debtor and Secured Party, intending to be legally bound
hereby, have duly executed this Agreement in one or more counterparts, each of
which shall be deemed to be an original, as of the day and year first aforesaid.

SECURED PARTY:                          DEBTOR:

OXFORD FINANCE CORPORATION              ATHENAHEALTH, INC.

By: /s/ Michael J. Altenburger          By: /s/ Jonathan Bush
    ---------------------------------       ------------------------------------
Name: Michael J. Altenburger            Name: Jonathan Bush
Title: Chief Financial Officer          Title: CEO

                                       20

<PAGE>

                                   SCHEDULE A

                                     FORM OF
                             COMPLIANCE CERTIFICATE

Oxford Finance Corporation
133 N. Fairfax Street
Alexandria, VA 22314

     Re: (Debtor)

Gentlemen:

Reference is made to the Master Security Agreement dated as of _________________
200__ (as the same have been and may be amended from time to time in writing,
the "LOAN AGREEMENT", the capitalized terms used herein as defined therein),
between Oxford Finance Corporation and (Debtor) (the "COMPANY").

     The undersigned authorized representative of the Company hereby certifies
that in accordance with the terms and conditions of the Loan Agreement, the
Company is in complete compliance for the financial reporting period ending
____________________ with all required financial reporting under the Loan
Agreement, except as noted below. Attached herewith are the required documents
supporting the foregoing certification. The undersigned further certifies that
the accompanying financial statements have been prepared in accordance with
Generally Accepted Accounting Principles, and are consistent from one period to
the next, except as explained below.

         Indicate compliance status by circling Yes/No under "Complies"

<TABLE>
<CAPTION>
REPORTING REQUIREMENT                REQUIRED                   COMPLIES
---------------------                --------                   --------
<S>                                  <C>                        <C>
Interim Financial Statements         Quarterly within 45 days   YES / NO
Monthly Financial Statements         Monthly within 30 days
Audited Financial Statements         FYE within 180 days
Date of most recent Board-approved
budget/plan
Submitted with Borrowing Request                                YES / NO
Any change in budget/plan since                                 YES / NO
prior Borrowing Request

EXPLANATIONS
</TABLE>

                                        Very truly yours,

                                        athenahealth, Inc.

                                        By:
                                            ------------------------------------
                                        Name:
                                              ----------------------------------
                                        Title:*
                                                --------------------------------

----------
*    Must be executed by Debtor's Chief Financial Officer.

                                       21

<PAGE>

                                  [SCHEDULE B]

                       Listing of Additional Indebtedness

<TABLE>
<CAPTION>
                                                     AMOUNT OF
                                   TYPE OF         INDEBTEDNESS
           PAYEE                 INDEBTEDNESS      AS OF 2/28/06         PAYMENT TERMS
---------------------------   -----------------   --------------   -------------------------
<S>                           <C>                 <C>              <C>
Silicon Valley Bank           Line of credit      $ 5,580,374.60   -    Final payment is due
                                                                        upon expiration of
                                                                        agreement on August
                                                                        17, 2006

Orix Venture Finance (to be   Equipment Line      $ 2,741,505.01   -    Each draw is payable
assigned to Bank of America                                             in 33 equal monthly
4/06)                                                                   installments, with
                                                                        the first payment
                                                                        starting the 1st day
                                                                        after the 4th month
                                                                        of the draw down.

                                                                   -    Final payment on all
                                                                        draws will be made
                                                                        12/1/2008.

Orix Venture Finance          Subordinate Debt    $12,000,000.00   -    Payments of $400,000
                                                                        begin on February 1,
                                                                        2008 and end on July
                                                                        1, 2010.

Presidents & Fellows of       Rent Loan           $ 1,108,501.65   -    Loan provided by the
Harvard                                                                 Company's new
                                                                        Landlord to pay the
                                                                        remaining rent of
                                                                        the old
                                                                        headquarters.

                                                                   -    Payments start
                                                                        January 1, 2006 and
                                                                        continue through
                                                                        June 1, 2015.

Presidents & Fellows of       Construction Loan   $ 3,837,916.78   -    Each draw down is
Harvard                                                                 payable in equal
                                                                        monthly installments
                                                                        over the life of the
                                                                        lease, which ends
                                                                        June 1, 2015.

GE                            Equipment Line      $   998,615.40   -    Each draw down is
                                                                        payable in 36 equal
                                                                        monthly
                                                                        installments.

                                                                   -    Final payment on all
                                                                        draws will be made
                                                                        March 2008

Pentech                       Equipment Line      $    97,082.09   -    Each draw down is
                                                                        payable in 36 equal
                                                                        monthly
                                                                        installments.

                                                                   -    Final payment on all
                                                                        draws will be made
                                                                        July 2006.
</TABLE>

                                             22
<PAGE>

                              COLLATERAL MIX RIDER

                                       TO
                      MASTER SECURITY AGREEMENT NO. 608111
                              DATED March 31, 2006
                                     BETWEEN
                OXFORD FINANCE CORPORATION (the "SECURED PARTY")
                                       AND
                        athenahealth, Inc. (the "DEBTOR")

Debtor shall cause the composition and mix of Equipment to conform to and meet
the following concentration requirements (hereinafter "Concentration
Requirement") for each class of Equipment (hereinafter "Equipment Class") as
identified and set forth below. Debtor herein represents and warrants that it
shall maintain each such Equipment Class and its respective Concentration
Requirement at all times during the funding period of January 2007 through
December 31, 2007, except where Secured Party (at its sole and absolute
discretion) authorizes any variance from the Concentration Requirement
("Concentration Variance"). If Secured Party authorizes the Concentration
Variance then, within 120 days of the date such Concentration Variance occurs,
Debtor will do one of the following (a "Concentration Correction"):

     1.   Grant to Secured Party a security interest in additional equipment
          satisfactory to Secured Party, not previously subject to Secured
          Party's security interest (collectively, the "Additional Equipment"),
          in sufficient type and amount so that the Concentration Requirement
          set forth below is met and the Concentration Variance is eliminated.
          The Additional Equipment shall be subject to all of the terms and
          conditions of the Master Security Agreement, including without
          limitation, Debtor's representations, warranties, and covenants, which
          shall be deemed remade by Debtor upon its grant of a security interest
          in the Additional Equipment.

     2.   Pay Secured Party cash in an amount equal to the Concentration
          Variance to hold as cash collateral until the Note is fully repaid.
          Debtor hereby grants Secured Party a security interest in such cash
          collateral and all proceeds and products thereof. Debtor agrees that
          such cash collateral held by Secured Party: (a) shall not bear
          interest, (b) may be commingled with other funds of Secured Party, and
          (c) may be applied by Secured Party to amounts owing by Debtor upon
          the occurrence and during the continuance of any Event of Default
          under the Master Security Agreement or the Note.

     The failure of Debtor to do a Concentration Correction within the 120-day
     time period shall constitute a Default under the Note and the Master
     Security Agreement.

<TABLE>
<CAPTION>
EQUIPMENT CLASS        CONCENTRATION REQUIREMENT
---------------        -------------------------
<S>                    <C>
Laboratory Equipment   Minimum of 65%

Soft                   Maximum of 35%
</TABLE>

Dated as of: March 19, 2007.

OXFORD FINANCE CORPORATION              athenahealth, Inc.

By: /s/ Michael J. Altenburger          By: /s/ Carl Byers
    ---------------------------------       ------------------------------------
Name: Michael J. Altenburger            Name: Carl Byers
Title: Chief Financial Officer          Title: CFO

<PAGE>

                           COLLATERAL SCHEDULE NO. 05
                             (36 MONTH AMORTIZATION)

THIS COLLATERAL SCHEDULE NO. 05 is annexed to and made a part of that certain
Master Security Agreement No. 6081111 dated as of March 31, 2006 ("Agreement")
between Oxford Finance Corporation, together with its successors and assigns, if
any, as Secured Party and athenahealth, Inc. as Debtor and describes collateral
in which Debtor has granted Secured Party a security interest in connection with
the Indebtedness (as defined in the Security Agreement) including without
limitation that certain Promissory Note dated March __, 2007, in the original
principal amount of $400,677.25 ("Note").

Debtor hereby reaffirms all of the representations, warranties, and covenants
contained in the Agreement and the Note as of the date hereof and further
represents and warrants to Secured Party that no default has occurred and is
continuing as of the date hereof.

Debtor further affirms that none of the Collateral for this Schedule has been
pledged as Collateral on previous Schedules under the Agreement.

SEE ATTACHED EXHIBIT A FOR LIST OF COLLATERAL, all of which Collateral for this
Schedule is located at the following address(es). If more than one address,
Exhibit A contains a column with an indication of the location of each item:

     Address 1: 311 Arsenal Street, Watertown, MA 02472
     Address 2: Savvis 580 Winter St., Waltham, MA 02451
     Address 3: 400 N Beacon, Watertown, MA 02471
     Address 4: 7736 N Mobley Road, Odessa, FL 33556

SECURED PARTY:                          DEBTOR:

OXFORD FINANCE CORPORATION              ATHENAHEALTH, INC.

By: /s/ Michael J. Altenburger          By: /s/ Carl Byers
    ---------------------------------       ------------------------------------
Name: Michael J. Altenburger            Name: Carl Byers
Title: Chief Financial Officer          Title: CFO
Date: 3/19/07                           Date: 3/16/07<PAGE>

                                                                   EXHIBIT 10.26

Promissory Note                             Master Security Agreement No.6081111
                                                                  Schedule No. 1

                                 PROMISSORY NOTE
                    To Master Security Agreement No. 6081111
                                 MARCH 31, 2006

FOR VALUE RECEIVED, athenahealth, Inc., a Delaware corporation, located at the
address stated below ("Maker") promises to pay to the order of Oxford Finance
Corporation or any subsequent holder hereof (each, a "Payee") at its office
located at 133 N. Fairfax STREET, ALEXANDRIA, VA 22314 or at such other place as
Payee or the holder hereof may designate, the principal sum of ONE MILLION EIGHT
HUNDRED Seventy Thousand Four HUNDRED TWENTY-ONE AND 36/100 DOLLARS
($1,870,421.36), with interest on the unpaid principal balance, from the date
hereof through and including the dates of payment, at a fixed interest rate of
Ten and Sixty-Nine One Hundredths of One Percent (10.69%) per annum, in thirty
six (36) consecutive monthly installments of principal and interest (each, a
"Periodic Installment") as follows:

<TABLE>
<CAPTION>
  Periodic
Installment        Amount
-----------   ---------------
<S>           <C>
I- 36         $60,422.71 each
</TABLE>

and a final installment which shall be in the amount of the total outstanding
principal and interest, if any. The first Periodic Installment shall be due and
payable on or about March 31, 2006, and each of the following Periodic
Installments and the final installment shall be due and payable on the first day
of each succeeding month (each, a "Payment Date") beginning May 1, 2006. Such
installments have been calculated on the basis of a 360-day year of twelve
30-day months. Each payment may, at the option of the Payee, be calculated and
applied on an assumption that such payment would be made on its due date. Maker
agrees to pay any initial partial month interest payment from the date of this
Note to the first day of the following month ("Interim Interest").

The acceptance by Payee of any payment which is less than payment in full of all
amounts due and owing at such time shall not constitute a waiver of Payee's
right to receive payment in full at such time or at any prior or subsequent
time.

The Maker hereby expressly authorizes the Payee to insert the date value is
actually given in the blank space on the face hereof and on all related
documents pertaining hereto.

This Note may be secured by a security agreement, chattel mortgage, pledge
agreement or like instrument (each of which is hereinafter called a "SECURITY
AGREEMENT" AND ANY Security Agreement, this Note and any other document
evidencing or securing this loan is hereinafter called a "Debt Document").

Time is of the essence hereof, If any installment or any other sum due under
this Note or any Security Agreement is not received within five (5) days of when
due, the Maker agrees to pay, in addition to the amount of each such installment
or other sum, a late payment charge of five percent (5%) of the amount of said
installment or other sum, but not exceeding any lawful maximum. If (i) Maker
fails to make payment of any amount due hereunder; or (ii) Maker is in default
under, or fails to perform under any term or condition contained in any Security
Agreement, then the entire principal sum remaining unpaid, together with all
accrued interest thereon and any other sum payable under this Note or any
Security Agreement, at the election of Payee, shall immediately become due and
payable, with interest thereon at the lesser of eighteen percent (18%) per annum
or the highest rate not prohibited by applicable law from the date of such
accelerated maturity until paid (both before and after any judgment).

For a period of ninety (90) days immediately following the date of closing of
either (i) Maker's initial public offering of its Common Stock or (ii) the
merger or consolidation of Maker with or the sale of a majority of Maker's
outstanding voting capital stock to an entity with a post-closing market
capitalization of at least $400 million, Maker shall be entitled to prepay in
full, but not in part, its entire Indebtedness hereunder by payment of the
entire Indebtedness plus an additional sum as a premium equal to the following
percentages of the remaining principal balance for the indicated period:

     From the date of this Note until the first anniversary of the date of this
     Note: three percent (3%)

                                   Page 1 of 4

<PAGE>

Promissory Note                             Master Security Agreement No.6081111
                                                                  Schedule No. 1

     From the first annual anniversary date of this Note until the second annual
     anniversary date of this Note: two percent (2%)

     From the second annual anniversary date of this Note until the third annual
     anniversary date of this Note: one percent (I%)

At all other times and notwithstanding anything to the contrary contained herein
or in the Security Agreement, Maker may prepay in full, but not in part, its
entire Indebtedness hereunder by payment of the entire Indebtedness plus an
additional sum as a premium equal to the following percentages of the remaining
principal balance for the indicated period:

     From the date of this Note until the first anniversary of the date of this
     Note: six percent (6%)

     From the first annual anniversary date of this Note until the second annual
     anniversary date of this Note: four percent (4%)

     From the second annual anniversary date of this Note until the third annual
     anniversary date of this Note: two percent (2%)

The Maker and all sureties, endorsers, guarantors, or any others (each such
person, other than the Maker, an "Obligor") who may at any time become liable
for the payment hereof jointly and severally consent hereby to any and all
extensions of time, renewals, waivers or modifications of, and all substitutions
or releases of, security or of any party primarily or secondarily liable on this
Note or any Security Agreement or any term and provision of either, which may be
made, granted or consented to by Payee, and agree that suit may be brought and
maintained against any one or more of them, at the election of Payee without
joinder of any other as a party thereto, and that Payee shall not be required
first to foreclose, proceed against, or exhaust any security hereof in order to
enforce payment of this Note. The Maker and each Obligor hereby waives
presentment, demand for payment, notice of nonpayment, protest, notice of
protest, notice of dishonor, and all other notices in connection herewith, as
well as filing of suit (it' permitted by law) and diligence in collecting this
Note or enforcing any of the security hereof, and agrees to pay (if and to the
extent permitted by law) all expenses incurred in collection, including Payee's
actual attorneys' fees.

Maker and Payee intend to strictly comply with all applicable federal and
Virginia laws, including applicable usury laws (or the usury laws of any
jurisdiction whose usury laws are deemed to apply to the Note or any other Debt
Document despite the intention and desire of the parties to apply the usury laws
of the Commonwealth of Virginia). Accordingly, the provisions of this paragraph
shall govern and control over every other provision of this Note or any other
Debt Document which conflicts or is inconsistent with this Section, even if such
provision declares that it controls. As used in this paragraph, the term
"interest" includes the aggregate of all charges, fees, benefits or other
compensation which constitute interest under applicable law, provided that, to
the maximum extent permitted by applicable law, (a) any non-principal payment
shall be characterized as an expense or as compensation for something other than
the use, forbearance or detention of money and not as interest, and (b) all
interest at any time contracted for, reserved, charged or received shall be
amortized, prorated, allocated and spread, in equal parts during the full term
of the obligations. In no event shall Maker or any other person be obligated to
pay, or Payee have any right or privilege to reserve, receive or retain, (a) any
interest in excess of the maximum amount of non-usurious interest permitted
under the laws of the Commonwealth of Virginia or the applicable laws (if any)
of the United States or of any other state, or (b) total interest in excess of
the amount which Payee could lawfully have contracted for, reserved, received,
retained or charged had the interest been calculated for the full term of the
obligations. On each day, if any, that the interest rate (the "Stated Rate")
called for under this Note or any other Debt Document exceeds the maximum
non-usurious rate, the rate at which interest shall accrue shall automatically
be fixed by operation of this sentence at the maximum non-usurious rate for that
day. Thereafter, interest shall accrue at the Stated Rate unless and until the
Stated Rate again exceeds the maximum non-usurious rate, in which case, the
provisions of the immediately preceding sentence shall again automatically
operate to limit the interest accrual rate to the maximum non-usurious rate. The
daily interest rates to be used in calculating interest at the maximum
non-usurious rate shall be determined by dividing the applicable maximum
non-usurious rate by the number of days in the calendar year for which such
calculation is being made. None of the terms and provisions contained in this
Note or in any other Debt Document which directly or indirectly relate to
interest shall ever be construed without

                                   Page 2 of 4

<PAGE>

Promissory Note                             Master Security Agreement No.6081111
                                                                  Schedule No. 1

reference to this paragraph, or be construed to create a contract to pay for the
use, forbearance or detention of money at an interest rate in excess of the
maximum non-usurious rate. If the term of any obligation is shortened by reason
of acceleration of maturity as a result of any Default or by any other cause, or
by reason of any required or permitted prepayment, and if for that (or any
other) reason Payee at any time, including but not limited to, the stated
maturity, is owed or receives (and/or has received) interest in excess of
interest calculated at the maximum non-usurious rate, then and in any such event
all of any such excess interest shall be canceled automatically as of the date
of such acceleration, prepayment or other event which produces the excess, and,
if such excess interest has been paid to Payee, it shall be credited pro tanto
against the then-outstanding principal balance of Maker's obligations to Payee,
effective as of the date or dates when the event occurs which causes it to be
excess interest, until such excess is exhausted or ail of such principal has
been fully paid and satisfied, whichever occurs first, and any remaining balance
of such excess shall be promptly refunded to its payor.

THE MAKER HEREBY UNCONDITIONALLY WAIVES ITS RIGHTS TO A JURY TRIAL OF ANY CLAIM
OR CAUSE OF ACTION BASED UPON OR ARISING OUT OF, DIRECTLY OR INDIRECTLY, THIS
NOTE, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS BETWEEN MAKER AND PAYEE
RELATING TO THE SUBJECT MATTER OF THIS TRANSACTION OR ANY RELATED TRANSACTIONS,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN MAKER AND PAYEE. THE
SCOPE OF THIS WAIVER IS INTENDED TO BE ALL ENCOMPASSING OF ANY AND ALL DISPUTES
THAT MAY BE FILED IN ANY COURT (INCLUDING, WITHOUT LIMITATION, CONTRACT CLAIMS,
TORT CLAIMS, BREACH OF DUTY CLAIMS, AND ALL OTHER COMMON LAW AND STATUTORY
CLAIMS.) THIS WAIVER IS IRREVOCABLE, MEANING THAT IT MAY NOT BE MODIFIED EITHER
ORALLY OR IN WRITING, AND THE WAIVER SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS,
RENEWALS, SUPPLEMENTS OR MODIFICATIONS TO THIS NOTE, ANY RELATED DOCUMENTS, OR
TO ANY OTHER DOCUMENTS OR AGREEMENTS RELATING TO THIS TRANSACTION OR ANY RELATED
TRANSACTION. IN THE EVENT OF LITIGATION, THIS NOTE MAY BE FILED AS A WRITTEN
CONSENT TO A TRIAL BY THE COURT.

This Note and any Security Agreement constitute the entire agreement of the
Maker and Payee with respect to the subject matter hereof and supersedes all
prior understandings, agreements and representations, express or implied.

No variation or modification of this Note, or any waiver of any of its
provisions or conditions, shall be valid unless in writing and signed by an
authorized representative of Maker and Payee. Any such waiver, consent,
modification or change shall be effective only in the specific instance and for
the specific purpose given.

Any provision in this Note or any Security Agreement which is in conflict with
any statute, law or applicable rule shall be deemed omitted, modified or altered
to conform thereto.

Upon receipt of an affidavit of an officer of Payee as to the loss, theft,
destruction or mutilation of this Note or any Debt Document which is not of
public record, and, in the case of any such loss, theft, destruction or
mutilation, upon surrender and cancellation of such Note or other Debt Document,
Maker will issue, in lieu thereof, a replacement Note or other Debt Document in
the same principal amount thereof and otherwise of like tenor.

It is understood and agreed that this Note and all of the Debt Documents were
negotiated and have been or will be delivered to Payee in the Commonwealth of
Virginia, which State the parties agree has a substantial relationship to the
parties and to the underlying transactions embodied by this Note and the Debt
Documents. Maker agrees to furnish to Payee at Payee's office in Alexandria, VA,
all further instruments, certifications and documents to be furnished hereunder.
The parties also agree that if collateral is pledged to secure the debt
evidenced by this Note, that the state or states in which such collateral is
located each have a substantial relationship to the parties and to the
underlying transaction embodied by this Note and the Debt Documents.

MAKER AGREES THAT THE PAYEE OF THIS NOTE SHALL HAVE THE OPTION BY WHICH STATE
LAWS THIS NOTE SHALL BE GOVERNED AND CONSTRUED: (A) THE LAWS OF THE COMMONWEALTH
OF VIRGINIA; OR (B) IF COLLATERAL HAS BEEN PLEDGED TO SECURE THE DEBT EVIDENCED
BY THIS NOTE, THEN BY THE LAWS OF THE STATE OR STATES WHERE THE

                                   Page 3 of 4

<PAGE>

Promissory Note                             Master Security Agreement No.6081111
                                                                  Schedule No. 1

COLLATERAL IS LOCATED, AT PAYEE'S OPTION. THIS CHOICE OF STATE LAWS IS EXCLUSIVE
TO THE PAYEE OF THIS NOTE. MAKER SHALL NOT HAVE ANY OPTION TO CHOOSE THE LAWS BY
WHICH THIS NOTE SHALL BE GOVERNED. MAKER AND GUARANTORS HEREBY CONSENT TO THE
EXERCISE OF JURISDICTION OVER IT BY ANY FEDERAL COURT SITTING IN VIRGINIA OR ANY
VIRGINIA COURT SELECTED BY PAYEE, FOR THE PURPOSES OF ANY AND ALL LEGAL
PROCEEDINGS ARISING OUT OF OR RELATING TO THE NOTE, THE LOAN AGREEMENT AND ALL
OTHER DOCUMENTS. MAKER AND GUARANTORS IRREVOCABLY WAIVE, TO THE FULLEST EXTENT
PERMITTED BY LAW, ANY OBJECTION WHICH IT MAY NOW OR HEREAFTER HAVE TO THE LAYING
OF VENUE OF ANY SUCH PROCEEDING BROUGHT IN ANY SUCH COURT, ANY CLAIM BASED ON
THE CONSOLIDATION OF PROCEEDINGS IN SUCH COURTS IN WHICH PROPER VENUE MAY LIE IN
DIVERGENT JURISDICTIONS. AND ANY CLAIM THAT ANY SUCH PROCEEDING BROUGHT IN ANY
SUCH COURT HAS BEEN BROUGHT IN AN INCONVENIENT FORUM. MAKER AND GUARANTORS
HEREBY IRREVOCABLY WAIVE, TO THE FULLEST EXTENT PERMITTED BY LAW, ANY AND ALL
RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO
THIS NOTE, THE OTHER DOCUMENTS OR THE TRANSACTIONS CONTEMPLATED THEREBY.

                                        athenahealth, Inc.

                                        By: /s/ Jonathan Bush
-------------------------------------       ------------------------------------
(Witness)                               Name: Jonathan Bush
                                        Title: CEO
-------------------------------------
(Print name)

-------------------------------------
(Address)

                                        Federal Tax ID #. 04-3387530

                                        Address: 311 Arsenal Street
                                                 Watertown, MA 02472

                                   Page 4 of 4
<PAGE>

                                 PROMISSORY NOTE
                    To Master Security Agreement No. 6081111
                                    June 2006

FOR VALUE RECEIVED, athenahealth, Inc., a Delaware corporation, located at the
address stated below ("Maker") promises to pay to the order of Oxford Finance
Corporation or any subsequent holder hereof (each, a "Payee") at its office
located at 133 N. Fairfax Street, Alexandria, VA 22314 Of at such other place as
Payee or the holder hereof may designate, the principal sum of One Million One
Hundred Ninety-Six Thousand, One Hundred Eighty-Four and Sixty-Eight
One-Hundredths Dollars ($1,196,184.68), with interest on the unpaid principal
balance, from the date hereof through and including the dates of payment, at a
fixed interest rate of Eleven and Four One-Hundredths Percent (11.04%) per
annum, in thirty six (36) consecutive monthly installments of principal and
interest (each, a "Periodic Installment") as follows:

<TABLE>
<CAPTION>
  Periodic
Installment        Amount
-----------   ---------------
<S>           <C>
1 - 36        $38,827.01 each
</TABLE>

and a final installment which shall be in the amount of the total outstanding
principal and interest, if any. The first Periodic Installment shall be due and
payable on or about June 21,2006, and each of the following Periodic
Installments and the final installment shall be due and payable on the first day
of each succeeding month (each, a "Payment Date") beginning August 1, 2006. Such
installments have been calculated on the basis of a 360-day year of twelve
30-day months. Each payment may, at the option of the Payee, be calculated and
applied on an assumption that such payment would be made on its due date. Maker
agrees to pay any initial partial month interest payment from the date of this
Note to the first day of the following month ("Interim Interest").

The acceptance by Payee of any payment which is less than payment in full of all
amounts due and owing at such time shall not constitute a waiver of Payee's
right to receive payment in full at such time or at any prior or subsequent
time.

The Maker hereby expressly authorizes the Payee to insert the date value is
actually given in the blank space on the face hereof and on all related
documents pertaining hereto.

This Note may be secured by a security agreement, chattel mortgage, pledge
agreement or like instrument (each of which is hereinafter called a "Security
Agreement" and any Security Agreement, this Note and any other document
evidencing or securing this loan is hereinafter called a "Debt Document").

Time is of the essence hereof. If any installment or any other sum due under
this Note or any Security Agreement is not received within five (5) days of when
due, the Maker agrees to pay, in addition to the amount of each such installment
or other sum, a late payment charge of five percent (5%) of the amount of said
installment or other sum, but not exceeding any lawful maximum. If (i) Maker
fails to make payment of any amount due hereunder; or (ii) Maker is in default
under, or fails to perform under any term or condition contained in any Security
Agreement, then the entire principal sum remaining unpaid, together with all
accrued interest

<PAGE>

thereon and any other sum payable under this Note or any Security Agreement, at
the election of Payee, shall immediately become due and payable, with interest
thereon at the lesser of eighteen percent (18%) per annum or the highest rate
not prohibited by applicable law from the date of such accelerated maturity
until paid (both before and after any judgment).

For a period of ninety (90) days immediately following the date of closing of
either (i) Maker's initial public offering of its Common Stock or (ii) the
merger or consolidation of Maker with or the sale of a majority of Maker's
outstanding voting capital stock to an entity with a post-closing market
capitalization of at least $400 million, Maker shall be entitled to prepay in
full, but not in part, its entire Indebtedness hereunder by payment of the
entire Indebtedness plus an additional sum as a premium equal to the following
percentages of the remaining principal balance for the indicated period:

     From the date of this Note until the first anniversary of the date of this
     Note: three percent (3%)

     From the first annual anniversary date of this Note until the second annual
     anniversary date of this Note: two percent (2%)

     From the second annual anniversary date of this Note until the third annual
     anniversary date of this Note: one percent (1%)

At all other times and notwithstanding anything to the contrary contained herein
or in the Security Agreement, Maker may prepay in full, but not in part, its
entire Indebtedness hereunder by payment of the entire Indebtedness plus an
additional sum as a premium equal to the following percentages of the remaining
principal balance for the indicated period:

     From the date of this Note until the first anniversary of the date of this
     Note: six percent (6%)

     From the first annual anniversary date of this Note until the second annual
     anniversary date of this Note: four percent (4%)

     From the second annual anniversary date of this Note until the third annual
     anniversary date of this Note: two percent (2%)

The Maker and all sureties, endorsers, guarantors, or any others (each such
person, other than the Maker, an "Obligor") who may at any time become liable
for the payment hereof jointly and severally consent hereby to any and all
extensions of time, renewals, waivers or modifications of, and all substitutions
or releases of, security or of any party primarily or secondarily liable on this
Note or any Security Agreement or any term and provision of either, which may be
made, granted or consented to by Payee, and agree that suit may be brought and
maintained against any one or more of them, at the election of Payee without
joinder of any other as a party thereto, and that Payee shall not be required
fast to foreclose, proceed against, or exhaust any security hereof in order to
enforce payment of this Note. The Maker and each Obligor hereby waives
presentment, demand for payment, notice of nonpayment, protest, notice of
protest, notice of dishonor, and all other notices in connection herewith, as
well as filing of suit (if permitted by law) and diligence in collecting this
Note or enforcing any of the security hereof, and agrees to

<PAGE>

pay (if and to the extent permitted by law) all expenses incurred in collection,
including Payee's actual attorneys' fees.

Maker and Payee intend to strictly comply with all applicable federal and
Virginia laws, including applicable usury laws (or the usury laws of any
jurisdiction whose usury laws are deemed to apply to the Note or any other Debt
Document despite the intention and desire of the parties to apply the usury laws
of the Commonwealth of Virginia). Accordingly, the provisions of this paragraph
shall govern and control over every other provision of this Note or any other
Debt Document which conflicts or is inconsistent with this Section, even if such
provision declares that it controls. As used in this paragraph, the term
"interest" includes the aggregate of all charges, fees, benefits or other
compensation which constitute interest under applicable law, provided that, to
the maximum extent permitted by applicable law, (a) any non-principal payment
shall be characterized as an expense or as compensation for something other than
the use, forbearance or detention of money and not as interest, and (b) all
interest at any time contracted for, reserved, charged or received shall be
amortized, prorated, allocated and spread, in equal parts during the full term
of the obligations. In no event shall Maker or any other person be obligated to
pay, or Payee have any right or privilege to reserve, receive or retain, (a) any
interest in excess of the maximum amount of non-usurious interest permitted
under the laws of the Commonwealth of Virginia or the applicable laws (if any)
of the United States or of any other state, or (b) total interest in excess of
the amount which Payee could lawfully have contracted for, reserved, received,
retained or charged had the interest been calculated for the full term of the
obligations. On each day, if any, that the interest rate (the "Stated Rate")
called for under this Note or any other Debt Document exceeds the maximum
non-usurious rate, the rate at which interest shall accrue shall automatically
be fixed by operation of this sentence at the maximum non-usurious rate for that
day. Thereafter, interest shall accrue at the Stated Rate unless and until the
Stated Rate again exceeds the maximum non-usurious rate, in which case, the
provisions of the immediately preceding sentence shall again automatically
operate to limit the interest accrual rate to the maximum non-usurious rate. The
daily interest rates to be used in calculating interest at the maximum
non-usurious rate shall be determined by dividing the applicable maximum
non-usurious rate by the number of days in the calendar year for which such
calculation is being made. None of the terms and provisions contained in this
Note or in any other Debt Document which directly or indirectly relate to
interest shall ever be construed without reference to this paragraph, or be
construed to create a contract to pay for the use, forbearance or detention of
money at an interest rate in excess of the maximum non-usurious rate. If the
term of any obligation is shortened by reason of acceleration of maturity as a
result of any Default or by any other cause, or by reason of any required or
permitted prepayment, and if for that (or any other) reason Payee at any time,
including but not limited to, the stated maturity, is owed or receives (and/or
has received) interest in excess of interest calculated at the maximum
non-usurious rate, then and in any such event all of any such excess interest
shall be canceled automatically as of the date of such acceleration, prepayment
or other event which produces the excess, and, if such excess interest has been
paid to Payee, it shall be credited pro tanto against the then-outstanding
principal balance of Makers obligations to Payee, effective as of the date or
dates when the event occurs which causes it to be excess interest, until such
excess is exhausted or all of such principal has been fully paid and satisfied,
whichever occurs first, and any remaining balance of such excess shall be
promptly refunded to its payor.

<PAGE>

THE MAKER HEREBY UNCONDITIONALLY WAIVES ITS RIGHTS TO A JURY TRIAL OF ANY CLAIM
OR CAUSE OF ACTION BASED UPON OR ARISING OUT OF, DIRECTLY OR INDIRECTLY, THIS
NOTE, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS BETWEEN MAKER AND PAYEE
RELATING TO THE SUBJECT MATTER OF THIS TRANSACTION OR ANY RELATED TRANSACTIONS,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN MAKER AND PAYEE. THE
SCOPE OF THIS WAIVER IS INTENDED TO BE ALL ENCOMPASSING OF ANY AND ALL DISPUTES
THAT MAY BE FILED IN ANY COURT (INCLUDING, WITHOUT LIMITATION, CONTRACT CLAIMS,
TORT CLAIMS, BREACH OF DUTY CLAIMS, AND ALL OTHER COMMON LAW AND STATUTORY
CLAIMS.) THIS WAIVER IS IRREVOCABLE, MEANING THAT IT MAY NOT BE MODIFIED EITHER
ORALLY OR IN WRITING, AND THE WAIVER SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS,
RENEWALS, SUPPLEMENTS OR MODIFICATIONS TO THIS NOTE, ANY RELATED DOCUMENTS, OR
TO ANY OTHER DOCUMENTS OR AGREEMENTS RELATING TO THIS TRANSACTION OR ANY RELATED
TRANSACTION. IN THE EVENT OF LITIGATION, THIS NOTE MAY BE FILED AS A WRITTEN
CONSENT TO A TRIAL BY THE COURT.

This Note and any Security Agreement constitute the entire agreement of the
Maker and Payee with respect to the subject matter hereof and supersedes all
prior understandings, agreements and representations, express or implied.

No variation or modification of this Note, or any waiver of any of its
provisions or conditions, shall be valid unless in writing and signed by an
authorized representative of Maker and Payee. Any such waiver, consent,
modification or change shall be effective only in the specific instance and for
the specific purpose given.

Any provision in this Note or any Security Agreement which is in conflict with
any statute, law or applicable rule shall be deemed omitted, modified or altered
to conform thereto.

Upon receipt of an affidavit of an officer of Payee as to the loss, theft,
destruction or mutilation of this Note or any Debt Document which is not of
public record, and, in the case of any such loss, theft, destruction or
mutilation, upon surrender and cancellation of such Note or other Debt Document,
Maker will issue, in lieu thereof, a replacement Note or other Debt Document in
the same principal amount thereof and otherwise of like tenor.

It is understood and agreed that this Note and all of the Debt Documents were
negotiated and have been or will be delivered to Payee in the Commonwealth of
Virginia, which State the parties agree has a substantial relationship to the
parties and to the underlying transactions embodied by this Note and the Debt
Documents. Maker agrees to furnish to Payee at Payee's office in Alexandria, VA,
all further instruments, certifications and documents to be furnished hereunder.
The parties also agree that if collateral is pledged to secure the debt
evidenced by this Note, that the state or states in which such collateral is
located each have a substantial relationship to the parties and to the
underlying transaction embodied by this Note and the Debt Documents.

<PAGE>

MAKER AGREES THAT THE PAYEE OF THIS NOTE SHALL HAVE THE OPTION BY WHICH STATE
LAWS THIS NOTE SHALL BE GOVERNED AND CONSTRUED: (A) THE LAWS OF THE COMMONWEALTH
OF VIRGINIA; OR (B) IF COLLATERAL HAS BEEN PLEDGED TO SECURE THE DEBT EVIDENCED
BY THIS NOTE, THEN BY THE LAWS OF THE STATE OR STATES WHERE THE COLLATERAL IS
LOCATED, AT PAYEE'S OPTION. THIS CHOICE OF STATE LAWS IS EXCLUSIVE TO THE PAYEE
OF THIS NOTE. MAKER SHALL NOT HAVE ANY OPTION TO CHOOSE THE LAWS BY WHICH THIS
NOTE SHALL BE GOVERNED. MAKER AND GUARANTORS HEREBY CONSENT TO THE EXERCISE OF
JURISDICTION OVER IT BY ANY FEDERAL COURT SITTING IN VIRGINIA OR ANY VIRGINIA
COURT SELECTED BY PAYEE, FOR THE PURPOSES OF ANY AND ALL LEGAL PROCEEDINGS
ARISING OUT OF OR RELATING TO THE NOTE, THE LOAN AGREEMENT AND ALL OTHER
DOCUMENTS. MAKER AND GUARANTORS IRREVOCABLY WAIVE, TO THE FULLEST EXTENT
PERMITTED BY LAW, ANY OBJECTION WHICH IT MAY NOW OR HEREAFTER HAVE TO THE LAYING
OF VENUE OF ANY SUCH PROCEEDING BROUGHT IN ANY SUCH COURT, ANY CLAIM BASED ON
THE CONSOLIDATION OF PROCEEDINGS IN SUCH COURTS IN WHICH PROPER VENUE MAY LIE IN
DIVERGENT JURISDICTIONS, AND ANY CLAIM THAT ANY SUCH PROCEEDING BROUGHT IN ANY
SUCH COURT HAS BEEN BROUGHT IN AN INCONVENIENT FORUM. MAKER AND GUARANTORS
HEREBY IRREVOCABLY WAIVE, TO THE FULLEST EXTENT PERMITTED BY LAW, ANY AND ALL
RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO
THIS NOTE, THE OTHER DOCUMENTS OR THE TRANSACTIONS CONTEMPLATED THEREBY.

                                        Athenahealth, Inc.

/s/ Scott Andrews                       By: /s/ Carl Byers
-------------------------------------       ------------------------------------
(Witness)                               Name: Carl Byers
                                        Title: CFO
Scott Andrews
(Print name)

311 Arsenal St Watertown, MA 02472
(Address)

                                        Federal Tax ID#: 04-3387530

                                        Address: 311 Arsenal Street
                                                 Watertown, MA 02472
<PAGE>

Promissory Note                             Master Security Agreement No.6081111
                                                                  Schedule No.03

                                 PROMISSORY NOTE
                  TO MASTER SECURITY AGREEMENT NO. 6081111
                               SEPTEMBER 27, 2006

FOR VALUE RECEIVED, athenahealth, Inc., a Delaware corporation, located at the
address stated below ("MAKER") promises to pay to the order of OXFORD FINANCE
CORPORATION or any subsequent holder hereof (each, a "PAYEE") at its office
located at 133 N. FAIRFAX STREET, ALEXANDRIA, VA 22314 or at such other place as
Payee or the holder hereof may designate, the principal sum of FIVE HUNDRED
TWENTY-NINE THOUSAND, ONE HUNDRED SEVENTY-EIGHT AND FORTY-EIGHT ONE-HUNDREDTHS
DOLLARS ($529,178.48), with interest on the unpaid principal balance, from the
date hereof through and including the dates of payment, at a fixed interest rate
of Ten and Sixty-Nine One-Hundredths Percent (10.69%) per annum, in thirty six
(36) consecutive monthly installments of principal and interest (each, a
"PERIODIC INSTALLMENT") as follows:

<TABLE>
<CAPTION>
Periodic
Installment        Amount
-----------   ---------------
<S>           <C>
1-36          $17.094.76 each
</TABLE>

and a final installment which shall be in the amount of the total outstanding
principal and interest, if any. The first Periodic Installment shall be due and
payable on or about September 28, 2006, and each of the following Periodic
Installments and the final installment shall be due and payable on the first day
of each succeeding month (each, a "PAYMENT DATE") beginning November 1, 2006.
Such installments have been calculated on the basis of a 360-day year of twelve
30-day months. Each payment may, at the option of the Payee, be calculated and
applied on an assumption that such payment would be made on its due date. Maker
agrees to pay any initial partial month interest payment from the date of this
Note to the first day of the following month ("Interim Interest").

The acceptance by Payee of any payment which is less than payment in full of all
amounts due and owing at such time shall not constitute a waiver of Payee's
right to receive payment in full at such time or at any prior or subsequent
time.

The Maker hereby expressly authorizes the Payee to insert the date value is
actually given in the blank space on the face hereof and on all related
documents pertaining hereto.

This Note may be secured by a security agreement, chattel mortgage, pledge
agreement or like instrument (each of which is hereinafter called a "SECURITY
AGREEMENT" AND ANY SECURITY AGREEMENT, THIS NOTE AND ANY OTHER DOCUMENT
EVIDENCING OR SECURING THIS LOAN IS HEREINAFTER CALLED A "DEBT DOCUMENT").

Time is of the essence hereof. If any installment or any other sum due under
this Note or any Security Agreement is not received within five (5) days of when
due, the Maker agrees to pay, in addition to the amount of each such installment
or other sum, a late payment charge of five percent (5%) of the amount of said
installment or other sum, but not exceeding any lawful maximum. If (i) Maker
fails to make payment of any amount due hereunder; or (ii) Maker is in default
under, or fails to perform under any term or condition contained in any Security
Agreement, then the entire principal sum remaining unpaid, together with all
accrued interest thereon and any other sum payable under this Note or any
Security Agreement, at the election of Payee, shall immediately become due and
payable, with interest thereon at the lesser of eighteen percent (18%) per annum
or the highest rate not prohibited by applicable law from the date of such
accelerated maturity until paid (both before and after any judgment).

For a period of ninety (90) days immediately following the date of closing of
either (i) Maker's initial public offering of its Common Stock or (ii) the
merger or consolidation of Maker with or the sale of a majority of Maker's
outstanding voting capital stock to an entity with a post-closing market
capitalization of at least $400 million, Maker shall be entitled to prepay in
full, but not in part, its entire Indebtedness hereunder by payment of the
entire Indebtedness plus an additional sum as a premium equal to the following
percentages of the remaining principal balance for the indicated period:

                                   Page 1 of 4

<PAGE>

Promissory Note                             Master Security Agreement No.6081111
                                                                  Schedule No.03

     From the date of this Note until the first anniversary of the date of this
     Note: three percent(3%)

     From the first annual anniversary date of this Note until the second annual
     anniversary date of this Note: two percent (2%)

     From the second annual anniversary date of this Note until the third annual
     anniversary date of this Note: one percent (1%)

At all other times and notwithstanding anything to the contrary contained herein
or in the Security Agreement, Maker may prepay in full, but not in part, its
entire Indebtedness hereunder by payment of the entire Indebtedness plus an
additional sum as a premium equal to the following percentages of the remaining
principal balance for the indicated period:

     From the date of this Note until the first anniversary of the date of this
     Note: six percent (6%)

     From the first annual anniversary date of this Note until the second annual
     anniversary date of this Note: four percent (4%)

     From the second annual anniversary date of this Note until the third annual
     anniversary date of this Note: two percent (2%)

The Maker and all sureties, endorsers, guarantors, or any others (each such
person, other than the Maker, an "Obligor") who may at any time become liable
for the payment hereof jointly and severally consent hereby to any and all
extensions of time, renewals, waivers or modifications of, and all substitutions
or releases of, security or of any party primarily or secondarily liable on this
Note or any Security Agreement or any term and provision of either, which may be
made, granted or consented to by Payee, and agree that suit may be brought and
maintained against any one or more of them, at the election of Payee without
joinder of any other as a party thereto, and that Payee shall not be required
first to foreclose, proceed against, or exhaust any security hereof in order to
enforce payment of this Note. The Maker and each Obligor hereby waives
presentment, demand for payment, notice of nonpayment, protest, notice of
protest, notice of dishonor, and all other notices in connection herewith, as
well as filing of suit (if permitted by law) and diligence in collecting this
Note or enforcing any of the security hereof, and agrees to pay (if and to the
extent permitted by law) all expenses incurred in collection, including Payee's
actual attorneys' fees.

Maker and Payee intend to strictly comply with all applicable federal and
Virginia laws, including applicable usury laws (or the usury laws of any
jurisdiction whose usury laws are deemed to apply to the Note or any other Debt
Document despite the intention and desire of the parties to apply the usury laws
of the Commonwealth of Virginia). Accordingly, the provisions of this paragraph
shall govern and control over every other provision of this Note or any other
Debt Document which conflicts or is inconsistent with this Section, even if such
provision declares that it controls. As used in this paragraph, the term
"INTEREST" includes the aggregate of all charges, fees, benefits or other
compensation which constitute interest under applicable law, provided that, to
the maximum extent permitted by applicable law, (a) any non-principal payment
shall be characterized as an expense or as compensation for something other than
the use, forbearance or detention of money and not as interest, and (b) all
interest at any time contracted for, reserved, charged or received shall be
amortized, prorated, allocated and spread, in equal parts during the full term
of the obligations. In no event shall Maker or any other person be obligated to
pay, or Payee have any right or privilege to reserve, receive or retain, (a) any
interest in excess of the maximum amount of non-usurious interest permitted
under the laws of the Commonwealth of Virginia or the applicable laws (if any)
of the United States or of any other state, or (b) total interest in excess of
the amount which Payee could lawfully have contracted for, reserved, received,
retained or charged had the interest been calculated for the full term of the
obligations. On each day, if any, that the interest rate (the "Stated Rate")
called for under this Note or any other Debt Document exceeds the maximum
non-usurious rate, the rate at which interest shall accrue shall automatically
be fixed by operation of this sentence at the maximum non-usurious rate for that
day. Thereafter, interest shall accrue at the Stated Rate unless and until the
Stated Rate again exceeds the maximum non-usurious rate, in which case, the
provisions of the immediately preceding sentence shall again automatically
operate to limit the interest accrual rate to the maximum non-usurious rate. The
daily interest rates to be used in calculating interest at the maximum non-
usurious rate shall be determined by dividing the applicable maximum
non-usurious rate by the number of days in the calendar year for which such
calculation is being made. None of the terms and provisions contained in this
Note or in any other Debt Document which directly or indirectly relate to
interest shall ever be construed without reference to this paragraph, or be
construed to create a contract to pay for the use, forbearance or detention of
money at an interest rate in excess of the maximum non-usurious rate. If the
term of any obligation is shortened by reason of acceleration of maturity as a
result of any Default or by any other cause, or by reason of any required or
permitted prepayment, and if for that (or any other) reason Payee at any time,

                                   Page 2 of 4

<PAGE>

Promissory Note                             Master Security Agreement No.6081111
                                                                  Schedule No.03

including but not limited to, the stated maturity, is owed or receives (and/or
has received) interest in excess of interest calculated at the maximum
non-usurious rate, then and in any such event all of any such excess interest
shall be canceled automatically as of the date of such acceleration, prepayment
or other event which produces the excess, and, if such excess interest has been
paid to Payee, it shall be credited pro tanto against the then-outstanding
principal balance of Maker's obligations to Payee, effective as of the date or
dates when the event occurs which causes it to be excess interest, until such
excess is exhausted or all of such principal has been fully paid and satisfied,
whichever occurs first, and any remaining balance of such excess shall be
promptly refunded to its payor.

THE MAKER HEREBY UNCONDITIONALLY WAIVES ITS RIGHTS TO A JURY TRIAL OF ANY CLAIM
OR CAUSE OF ACTION BASED UPON OR ARISING OUT OF, DIRECTLY OR INDIRECTLY, THIS
NOTE, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS BETWEEN MAKER AND PAYEE
RELATING TO THE SUBJECT MATTER OF THIS TRANSACTION OR ANY RELATED TRANSACTIONS,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN MAKER AND PAYEE. THE
SCOPE OF THIS WAIVER IS INTENDED TO BE ALL ENCOMPASSING OF ANY AND ALL DISPUTES
THAT MAY BE FILED IN ANY COURT (INCLUDING, WITHOUT LIMITATION, CONTRACT CLAIMS,
TORT CLAIMS, BREACH OF DUTY CLAIMS, AND ALL OTHER COMMON LAW AND STATUTORY
CLAIMS.) THIS WAIVER IS IRREVOCABLE, MEANING THAT IT MAY NOT BE MODIFIED EITHER
ORALLY OR IN WRITING, AND THE WAIVER SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS,
RENEWALS, SUPPLEMENTS OR MODIFICATIONS TO THIS NOTE, ANY RELATED DOCUMENTS, OR
TO ANY OTHER DOCUMENTS OR AGREEMENTS RELATING TO THIS TRANSACTION OR ANY RELATED
TRANSACTION. IN THE EVENT OF LITIGATION, THIS NOTE MAY BE FILED AS A WRITTEN
CONSENT TO A TRIAL BY THE COURT.

This Note and any Security Agreement constitute the entire agreement of the
Maker and Payee with respect to the subject matter hereof and supersedes all
prior understandings, agreements and representations, express or implied.

No variation or modification of this Note, or any waiver of any of its
provisions or conditions, shall be valid unless in writing and signed by an
authorized representative of Maker and Payee. Any such waiver, consent,
modification or change shall be effective only in the specific instance and for
the specific purpose given.

Any provision in this Note or any Security Agreement which is in conflict with
any statute, law or applicable rule shall be deemed omitted, modified or altered
to conform thereto.

Upon receipt of an affidavit of an officer of Payee as to the loss, theft,
destruction or mutilation of this Note or any Debt Document which is not of
public record, and, in the case of any such loss, theft, destruction or
mutilation, upon surrender and cancellation of such Note or other Debt Document,
Maker will issue, in lieu thereof, a replacement Note or other Debt Document in
the same principal amount thereof and otherwise of like tenor.

It is understood and agreed that this Note and all of the Debt Documents were
negotiated and have been or will be delivered to Payee in the Commonwealth of
Virginia, which State the parties agree has a substantial relationship to the
parties and to the underlying transactions embodied by this Note and the Debt
Documents. Maker agrees to furnish to Payee at Payee's office in Alexandria, VA,
all further instruments, certifications and documents to be furnished hereunder.
The parties also agree that if collateral is pledged to secure the debt
evidenced by this Note, that the state or states in which such collateral is
located each have a substantial relationship to the parties and to the
underlying transaction embodied by this Note and the Debt Documents.

                                  Page 3 of 4

<PAGE>

Promissory Note                             Master Security Agreement No.6081111
                                                                  Schedule No.03

MAKER AGREES THAT THE PAYEE OF THIS NOTE SHALL HAVE THE OPTION BY WHICH STATE
LAWS THIS NOTE SHALL BE GOVERNED AND CONSTRUED: (A) THE LAWS OF THE COMMONWEALTH
OF VIRGINIA; OR (B) IF COLLATERAL HAS BEEN PLEDGED TO SECURE THE DEBT EVIDENCED
BY THIS NOTE, THEN BY THE LAWS OF THE STATE OR STATES WHERE THE COLLATERAL IS
LOCATED, AT PAYEE'S OPTION. THIS CHOICE OF STATE LAWS IS EXCLUSIVE TO THE PAYEE
OF THIS NOTE. MAKER SHALL NOT HAVE ANY OPTION TO CHOOSE THE LAWS BY WHICH THIS
NOTE SHALL BE GOVERNED. MAKER AND GUARANTORS HEREBY CONSENT TO THE EXERCISE OF
JURISDICTION OVER IT BY ANY FEDERAL COURT SITTING IN VIRGINIA OR ANY VIRGINIA
COURT SELECTED BY PAYEE, FOR THE PURPOSES OF ANY AND ALL LEGAL PROCEEDINGS
ARISING OUT OF OR RELATING TO THE NOTE, THE LOAN AGREEMENT AND ALL OTHER
DOCUMENTS. MAKER AND GUARANTORS IRREVOCABLY WAIVE, TO THE FULLEST EXTENT
PERMITTED BY LAW, ANY OBJECTION WHICH IT MAY NOW OR HEREAFTER HAVE TO THE LAYING
OF VENUE OF ANY SUCH PROCEEDING BROUGHT IN ANY SUCH COURT, ANY CLAIM BASED ON
THE CONSOLIDATION OF PROCEEDINGS IN SUCH COURTS IN WHICH PROPER VENUE MAY LIE IN
DIVERGENT JURISDICTIONS, AND ANY CLAIM THAT ANY SUCH PROCEEDING BROUGHT IN ANY
SUCH COURT HAS BEEN BROUGHT IN AN INCONVENIENT FORUM. MAKER AND GUARANTORS
HEREBY IRREVOCABLY WAIVE, TO THE FULLEST EXTENT PERMITTED BY LAW, ANY AND ALL
RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO
THIS NOTE, THE OTHER DOCUMENTS OR THE TRANSACTIONS CONTEMPLATED THEREBY.

                                        athenahealth, Inc.

/s/ Monica Nendza                       By: /s/ Carl Byers
-------------------------------------       ------------------------------------
(Witness)                               Name: Carl Byers
Monica Nendza                           Title: CFO
(Print name)                            Federal Tax ID #: 04-3387530
311 Arsenal St Watertown, MA 02472      Address: 311 Arsenal Street
(Address)                                        Watertown, MA 02472

                                   Page 4 of 4
<PAGE>

Promissory Note                             Master Security Agreement No.6081111
                                                                  Schedule No.04

                                PROMISSORY NOTE
                    TO MASTER SECURITY AGREEMENT NO. 6081111
                                DECEMBER 15, 2006

FOR VALUE RECEIVED, athenahealth, Inc., a Delaware corporation, located at the
address stated below ("MAKER") promises to pay to the order of OXFORD FINANCE
CORPORATION or any subsequent holder hereof (each, a "PAYEE") at its office
located at 133 N. FAIRFAX STREET, ALEXANDRIA, VA 22314 or at such other place as
Payee or the holder hereof may designate, the principal sum of ONE MILLION, ONE
HUNDRED FIFTY-SEVEN THOUSAND, ONE HUNDRED FIFTY AND FORTY-EIGHT ONE-HUNDREDTHS
DOLLARS ($1,157,150.48), with interest on the unpaid principal balance, from the
date hereof through and including the dates of payment, at a fixed interest rate
of Ten and Forty-eight One-Hundredths Percent (10.48%) per annum, in thirty six
(36) consecutive monthly installments of principal and interest (each, a
"PERIODIC INSTALLMENT") as follows:

<TABLE>
<CAPTION>
Periodic
Installment        Amount
-----------   ---------------
<S>           <C>
1-36          $37,273.78 each
</TABLE>

and a final installment which shall be in the amount of the total outstanding
principal and interest, if any. The first Periodic Installment shall be due and
payable on or about December 15, 2006, and each of the following Periodic
Installments and the final installment shall be due and payable on the first day
of each succeeding month (each, a "PAYMENT DATE") beginning February 1, 2007.
Such installments have been calculated on the basis of a 360-day year of twelve
30-day months. Each payment may, at the option of the Payee, be calculated and
applied on an assumption that such payment would be made on its due date. Maker
agrees to pay any initial partial month interest payment from the date of this
Note to the first day of the following month ("Interim Interest").

The acceptance by Payee of any payment which is less than payment in full of all
amounts due and owing at such time shall not constitute a waiver of Payee's
right to receive payment in full at such time or at any prior or subsequent
time.

The Maker hereby expressly authorizes the Payee to insert the date value is
actually given in the blank space on the face hereof and on all related
documents pertaining hereto.

This Note may be secured by a security agreement, chattel mortgage, pledge
agreement or like instrument (each of which is hereinafter called a "SECURITY
AGREEMENT" AND ANY SECURITY AGREEMENT, THIS NOTE AND ANY OTHER DOCUMENT
EVIDENCING OR SECURING THIS LOAN IS HEREINAFTER CALLED A "DEBT DOCUMENT").

Time is of the essence hereof. If any installment or any other sum due under
this Note or any Security Agreement is not received within five (5) days of when
due, the Maker agrees to pay, in addition to the amount of each such installment
or other sum, a late payment charge of five percent (5%) of the amount of said
installment or other sum, but not exceeding any lawful maximum. If (i) Maker
fails to make payment of any amount due hereunder; or (ii) Maker is in default
under, or fails to perform under any term or condition contained in any Security
Agreement, then the entire principal sum remaining unpaid, together with all
accrued interest thereon and any other sum payable under this Note or any
Security Agreement, at the election of Payee, shall immediately become due and
payable, with interest thereon at the lesser of eighteen percent (18%) per annum
or the highest rate not prohibited by applicable law from the date of such
accelerated maturity until paid (both before and after any judgment).

For a period of ninety (90) days immediately following the date of closing of
either (i) Maker's initial public offering of its Common Stock or (ii) the
merger or consolidation of Maker with or the sale of a majority of Maker's
outstanding voting capital stock to an entity with a post-closing market
capitalization of at least $400 million, Maker shall be entitled to prepay in
full, but not in part, its entire Indebtedness hereunder by payment of the
entire Indebtedness plus an additional sum as a premium equal to the following
percentages of the remaining principal balance for the indicated period:

                                   Page 1 of 4

<PAGE>

Promissory Note                             Master Security Agreement No.6081111
                                                                  Schedule No.04

     From the date of this Note until the first anniversary of the date of this
     Note: three percent(3%)

     From the first annual anniversary date of this Note until the second annual
     anniversary date of this Note: two percent (2%)

     From the second annual anniversary date of this Note until the third annual
     anniversary date of this Note: one percent (1%)

At all other times and notwithstanding anything to the contrary contained herein
or in the Security Agreement, Maker may prepay in full, but not in part, its
entire Indebtedness hereunder by payment of the entire Indebtedness plus an
additional sum as a premium equal to the following percentages of the remaining
principal balance for the indicated period:

     From the date of this Note until the first anniversary of the date of this
     Note: six percent (6%)

     From the first annual anniversary date of this Note until the second annual
     anniversary date of this Note: four percent (4%)

     From the second annual anniversary date of this Note until the third annual
     anniversary date of this Note: two percent (2%)

The Maker and all sureties, endorsers, guarantors, or any others (each such
person, other than the Maker, an "Obligor") who may at any time become liable
for the payment hereof jointly and severally consent hereby to any and all
extensions of time, renewals, waivers or modifications of, and all substitutions
or releases of, security or of any party primarily or secondarily liable on this
Note or any Security Agreement or any term and provision of either, which may be
made, granted or consented to by Payee, and agree that suit may be brought and
maintained against any one or more of them, at the election of Payee without
joinder of any other as a party thereto, and that Payee shall not be required
first to foreclose, proceed against, or exhaust any security hereof in order to
enforce payment of this Note. The Maker and each Obligor hereby waives
presentment, demand for payment, notice of nonpayment, protest, notice of
protest, notice of dishonor, and all other notices in connection herewith, as
well as filing of suit (if permitted by law) and diligence in collecting this
Note or enforcing any of the security hereof, and agrees to pay (if and to the
extent permitted by law) all expenses incurred in collection, including Payee's
actual attorneys' fees.

Maker and Payee intend to strictly comply with all applicable federal and
Virginia laws, including applicable usury laws (or the usury laws of any
jurisdiction whose usury laws are deemed to apply to the Note or any other Debt
Document despite the intention and desire of the parties to apply the usury laws
of the Commonwealth of Virginia). Accordingly, the provisions of this paragraph
shall govern and control over every other provision of this Note or any other
Debt Document which conflicts or is inconsistent with this Section, even if such
provision declares that it controls. As used in this paragraph, the term
"interest" includes the aggregate of all charges, fees, benefits or other
compensation which constitute interest under applicable law, provided that, to
the maximum extent permitted by applicable law, (a) any non-principal payment
shall be characterized as an expense or as compensation for something other than
the use, forbearance or detention of money and not as interest, and (b) all
interest at any time contracted for, reserved, charged or received shall be
amortized, prorated, allocated and spread, in equal parts during the full term
of the obligations. In no event shall Maker or any other person be obligated to
pay, or Payee have any right or privilege to reserve, receive or retain, (a) any
interest in excess of the maximum amount of non-usurious interest permitted
under the laws of the Commonwealth of Virginia or the applicable laws (if any)
of the United States or of any other state, or (b) total interest in excess of
the amount which Payee could lawfully have contracted for, reserved, received,
retained or charged had the interest been calculated for the full term of the
obligations. On each day, if any, that the interest rate (the "Stated Rate")
called for under this Note or any other Debt Document exceeds the maximum
non-usurious rate, the rate at which interest shall accrue shall automatically
be fixed by operation of this sentence at the maximum non-usurious rate for that
day. Thereafter, interest shall accrue at the Stated Rate unless and until the
Stated Rate again exceeds the maximum non-usurious rate, in which case, the
provisions of the immediately preceding sentence shall again automatically
operate to limit the interest accrual rate to the maximum non-usurious rate. The
daily interest rates to be used in calculating interest at the maximum non-
usurious rate shall be determined by dividing the applicable maximum
non-usurious rate by the number of days in the calendar year for which such
calculation is being made. None of the terms and provisions contained in this
Note or in any other Debt Document which directly or indirectly relate to
interest shall ever be construed without reference to this paragraph, or be
construed to create a contract to pay for the use, forbearance or detention of
money at an interest rate in excess of the maximum non-usurious rate. If the
term of any obligation is shortened by reason of acceleration of maturity as a
result of any Default or by any other cause, or by reason of any required or
permitted prepayment, and if for that (or any other) reason Payee at any time,

                                  Page 2 of 4

<PAGE>

Promissory Note                             Master Security Agreement No.6081111
                                                                  Schedule No.04

including but not limited to, the stated maturity, is owed or receives (and/or
has received) interest in excess of interest calculated at the maximum
non-usurious rate, then and in any such event all of any such excess interest
shall be canceled automatically as of the date of such acceleration, prepayment
or other event which produces the excess, and, if such excess interest has been
paid to Payee, it shall be credited pro tanto against the then-outstanding
principal balance of Maker's obligations to Payee, effective as of the date or
dates when the event occurs which causes it to be excess interest, until such
excess is exhausted or all of such principal has been fully paid and satisfied,
whichever occurs first, and any remaining balance of such excess shall be
promptly refunded to its payor.

THE MAKER HEREBY UNCONDITIONALLY WAIVES ITS RIGHTS TO A JURY TRIAL OF ANY CLAIM
OR CAUSE OF ACTION BASED UPON OR ARISING OUT OF, DIRECTLY OR INDIRECTLY, THIS
NOTE, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS BETWEEN MAKER AND PAYEE
RELATING TO THE SUBJECT MATTER OF THIS TRANSACTION OR ANY RELATED TRANSACTIONS,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN MAKER AND PAYEE. THE
SCOPE OF THIS WAIVER IS INTENDED TO BE ALL ENCOMPASSING OF ANY AND ALL DISPUTES
THAT MAY BE FILED IN ANY COURT (INCLUDING, WITHOUT LIMITATION, CONTRACT CLAIMS,
TORT CLAIMS, BREACH OF DUTY CLAIMS, AND ALL OTHER COMMON LAW AND STATUTORY
CLAIMS.) THIS WAIVER IS IRREVOCABLE, MEANING THAT IT MAY NOT BE MODIFIED EITHER
ORALLY OR IN WRITING, AND THE WAIVER SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS,
RENEWALS, SUPPLEMENTS OR MODIFICATIONS TO THIS NOTE, ANY RELATED DOCUMENTS, OR
TO ANY OTHER DOCUMENTS OR AGREEMENTS RELATING TO THIS TRANSACTION OR ANY RELATED
TRANSACTION. IN THE EVENT OF LITIGATION, THIS NOTE MAY BE FILED AS A WRITTEN
CONSENT TO A TRIAL BY THE COURT.

This Note and any Security Agreement constitute the entire agreement of the
Maker and Payee with respect to the subject matter hereof and supersedes all
prior understandings, agreements and representations, express or implied.

No variation or modification of this Note, or any waiver of any of its
provisions or conditions, shall be valid unless in writing and signed by an
authorized representative of Maker and Payee. Any such waiver, consent,
modification or change shall be effective only in the specific instance and for
the specific purpose given.

Any provision in this Note or any Security Agreement which is in conflict with
any statute, law or applicable rule shall be deemed omitted, modified or altered
to conform thereto.

Upon receipt of an affidavit of an officer of Payee as to the loss, theft,
destruction or mutilation of this Note or any Debt Document which is not of
public record, and, in the case of any such loss, theft, destruction or
mutilation, upon surrender and cancellation of such Note or other Debt Document,
Maker will issue, in lieu thereof, a replacement Note or other Debt Document in
the same principal amount thereof and otherwise of like tenor.

It is understood and agreed that this Note and all of the Debt Documents were
negotiated and have been or will be delivered to Payee in the Commonwealth of
Virginia, which State the parties agree has a substantial relationship to the
parties and to the underlying transactions embodied by this Note and the Debt
Documents. Maker agrees to furnish to Payee at Payee's office in Alexandria, VA,
all further instruments, certifications and documents to be furnished hereunder.
The parties also agree that if collateral is pledged to secure the debt
evidenced by this Note, that the state or states in which such collateral is
located each have a substantial relationship to the parties and to the
underlying transaction embodied by this Note and the Debt Documents.

                                  Page 3 of 4

<PAGE>

Promissory Note                             Master Security Agreement No.6081111
                                                                  Schedule No.04

MAKER AGREES THAT THE PAYEE OF THIS NOTE SHALL HAVE THE OPTION BY WHICH STATE
LAWS THIS NOTE SHALL BE GOVERNED AND CONSTRUED: (A) THE LAWS OF THE COMMONWEALTH
OF VIRGINIA; OR (B) IF COLLATERAL HAS BEEN PLEDGED TO SECURE THE DEBT EVIDENCED
BY THIS NOTE, THEN BY THE LAWS OF THE STATE OR STATES WHERE THE COLLATERAL IS
LOCATED, AT PAYEE'S OPTION. THIS CHOICE OF STATE LAWS IS EXCLUSIVE TO THE PAYEE
OF THIS NOTE. MAKER SHALL NOT HAVE ANY OPTION TO CHOOSE THE LAWS BY WHICH THIS
NOTE SHALL BE GOVERNED. MAKER AND GUARANTORS HEREBY CONSENT TO THE EXERCISE OF
JURISDICTION OVER IT BY ANY FEDERAL COURT SITTING IN VIRGINIA OR ANY VIRGINIA
COURT SELECTED BY PAYEE, FOR THE PURPOSES OF ANY AND ALL LEGAL PROCEEDINGS
ARISING OUT OF OR RELATING TO THE NOTE, THE LOAN AGREEMENT AND ALL OTHER
DOCUMENTS. MAKER AND GUARANTORS IRREVOCABLY WAIVE, TO THE FULLEST EXTENT
PERMITTED BY LAW, ANY OBJECTION WHICH IT MAY NOW OR HEREAFTER HAVE TO THE LAYING
OF VENUE OF ANY SUCH PROCEEDING BROUGHT IN ANY SUCH COURT, ANY CLAIM BASED ON
THE CONSOLIDATION OF PROCEEDINGS IN SUCH COURTS IN WHICH PROPER VENUE MAY LIE IN
DIVERGENT JURISDICTIONS, AND ANY CLAIM THAT ANY SUCH PROCEEDING BROUGHT IN ANY
SUCH COURT HAS BEEN BROUGHT IN AN INCONVENIENT FORUM. MAKER AND GUARANTORS
HEREBY IRREVOCABLY WAIVE, TO THE FULLEST EXTENT PERMITTED BY LAW, ANY AND ALL
RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO
THIS NOTE, THE OTHER DOCUMENTS OR THE TRANSACTIONS CONTEMPLATED THEREBY.

                                        athenahealth, Inc.

/s/ Monica Nendza                       By: /s/ Carl Byers
-------------------------------------       ------------------------------------
(Witness)                               Name: Carl Byers
Monica Nendza                           Title: CFO
(Print name)
311 Arsenal St Watertown, MA 02472      Federal Tax ID #: 04-3387530
(Address)
                                        Address: 311 Arsenal Street
                                                 Watertown, MA 02472

                                   Page 4 of 4
<PAGE>

Promissory Note                            Master Security Agreement No. 6081111
                                                                 Schedule No. 05

                                 PROMISSORY NOTE
                    TO MASTER SECURITY AGREEMENT NO. 6081111
                                  MARCH 19,2007

FOR VALUE RECEIVED, athenahealth, Inc., a Delaware corporation, located at the
address stated below ("MAKER") promises to pay to the order of OXFORD FINANCE
CORPORATION or any subsequent holder hereof (each, a "PAYEE") at its office
located at 133 N. FAIRFAX STREET, ALEXANDRIA, VA 22314 or at such other place as
Payee or the holder hereof may designate, the principal sum of FOUR HUNDRED
THOUSAND, SIX HUNDRED SEVENTY-SEVEN AND TWENTY-FIVE ONE-HUNDREDTHS DOLLARS
($400,677.25), with interest on the unpaid principal balance, from the date
hereof through and including the dates of payment, at a fixed interest rate of
Eleven and Fifty-One One-Hundredths Percent (11.51%) per annum, in thirty six
(36) consecutive monthly installments of principal and interest (each, a
"PERIODIC INSTALLMENT") as follows:

<TABLE>
<CAPTION>
Periodic
Installment        Amount
-----------   ---------------
<S>           <C>
1- 36         $13,089.09 each
</TABLE>

and a final installment which shall be in the amount of the total outstanding
principal and interest, if any. The first Periodic Installment shall be due and
payable on or about March 19, 2007, and each of the following Periodic
Installments and the final installment shall be due and payable on the first day
of each succeeding month (each, a "PAYMENT DATE") beginning May 1, 2007. Such
installments have been calculated on the basis of a 360-day year of twelve
30-day months. Each payment may, at the option of the Payee, be calculated and
applied on an assumption that such payment would be made on its due date. Maker
agrees to pay any initial partial month interest payment from the date of this
Note to the first day of the following month ("Interim Interest").

The acceptance by Payee of any payment which is less than payment in full of all
amounts due and owing at such time shall not constitute a waiver of Payee's
right to receive payment in full at such time or at any prior or subsequent
time.

The Maker hereby expressly authorizes the Payee to insert the date value is
actually given in the blank space on the face hereof and on all related
documents pertaining hereto.

This Note may be secured by a security agreement, chattel mortgage, pledge
agreement or like instrument (each of which is hereinafter called a "Security
Agreement" and any Security Agreement, this Note and any other document
evidencing or securing this loan is hereinafter called a "Debt Document").

Time is of the essence hereof. If any installment or any other sum due under
this Note or any Security Agreement is not received within five (5) days of when
due, the Maker agrees to pay, in addition to the amount of each such installment
or other sum, a late payment charge of five percent (5%) of the amount of said
installment or other sum, but not exceeding any lawful maximum. If (i) Maker
fails to make payment of any amount due hereunder; or (ii) Maker is in default
under, or fails to perform under any term or condition contained in any Security
Agreement, then the entire principal sum remaining unpaid, together with all
accrued interest thereon and any other sum payable under this Note or any
Security Agreement, at the election of Payee, shall immediately become due and
payable, with interest thereon at the lesser of eighteen percent (18%) per annum
or the highest rate not prohibited by applicable law from the date of such
accelerated maturity until paid (both before and after any judgment).

For a period of ninety (90) days immediately following the date of closing of
either (i) Maker's initial public offering of its Common Stock or (ii) the
merger or consolidation of Maker with or the sale of a majority of Maker's
outstanding voting capital stock to an entity with a post-closing market
capitalization of at least $400 million, Maker shall be entitled to prepay in
full, but not in part, its entire Indebtedness hereunder by payment of the
entire Indebtedness plus an additional sum as a premium equal to the following
percentages of the remaining principal balance for the indicated period:

                                   Page 1 of 4

<PAGE>

Promissory Note                            Master Security Agreement No. 6081111
                                                                 Schedule No. 05

     From the date of this Note until the first anniversary of the date of this
     Note: three percent (3%)

     From the first annual anniversary date of this Note until the second annual
     anniversary date of this Note: two percent (2%)

     From the second annual anniversary date of this Note until the third annual
     anniversary date of this Note: one percent (1%)

At all other times and notwithstanding anything to the contrary contained herein
or in the Security Agreement, Maker may prepay in full, but not in part, its
entire Indebtedness hereunder by payment of the entire Indebtedness plus an
additional sum as a premium equal to the following percentages of the remaining
principal balance for the indicated period:

     From the date of this Note until the first anniversary of the date of this
     Note: six percent (6%)

     From the first annual anniversary date of this Note until the second annual
     anniversary date of this Note: four percent (4%)

     From the second annual anniversary date of this Note until the third annual
     anniversary date of this Note: two percent (2%)

The Maker and all sureties, endorsers, guarantors, or any others (each such
person, other than the Maker, an "Obligor") who may at any time become liable
for the payment hereof jointly and severally consent hereby to any and all
extensions of time, renewals, waivers or modifications of, and all substitutions
or releases of, security or of any party primarily or secondarily liable on this
Note or any Security Agreement or any term and provision of either, which may be
made, granted or consented to by Payee, and agree that suit may be brought and
maintained against any one or more of them, at the election of Payee without
joinder of any other as a party thereto, and that Payee shall not be required
first to foreclose, proceed against, or exhaust any security hereof in order to
enforce payment of this Note. The Maker and each Obligor hereby waives
presentment, demand for payment, notice of nonpayment, protest, notice of
protest, notice of dishonor, and all other notices in connection herewith, as
well as filing of suit (if permitted by law) and diligence in collecting this
Note or enforcing any of the security hereof and agrees to pay (if and to the
extent permitted by law) all expenses incurred in collection, including Payee's
actual attorneys' fees.

Maker and Payee intend to strictly comply with all applicable federal and
Virginia laws, including applicable usury laws (or the usury laws of any
jurisdiction whose usury laws are deemed to apply to the Note or any other Debt
Document despite the intention and desire of the parties to apply the usury laws
of the Commonwealth of Virginia). Accordingly, the provisions of this paragraph
shall govern and control over every other provision of this Note or any other
Debt Document which conflicts or is inconsistent with this Section, even if such
provision declares that it controls. As used in this paragraph, the term
"INTEREST" includes the aggregate of all charges, fees, benefits or other
compensation which constitute interest under applicable law, provided that, to
the maximum extent permitted by applicable law, (a) any non-principal payment
shall be characterized as an expense or as compensation for something other than
the use, forbearance or detention of money and not as interest, and (b) all
interest at any time contracted for, reserved, charged or received shall be
amortized, prorated, allocated and spread, in equal parts during the full term
of the obligations. In no event shall Maker or any other person be obligated to
pay, or Payee have any right or privilege to reserve, receive or retain, (a) any
interest in excess of the maximum amount of non-usurious interest permitted
under the laws of the Commonwealth of Virginia or the applicable laws (if any)
of the United States or of any other state, or (b) total interest in excess of
the amount which Payee could lawfully have contracted for, reserved, received,
retained or charged had the interest been calculated for the full term of the
obligations. On each day, if any, that the interest rate (the "Stated Rate")
called for under this Note or any other Debt Document exceeds the maximum
non-usurious rate, the rate at which interest shall accrue shall automatically
be fixed by operation of this sentence at the maximum non-usurious rate for that
day. Thereafter, interest shall accrue at the Stated Rate unless and until the
Stated Rate again exceeds the maximum non-usurious rate, in which case, the
provisions of the immediately preceding sentence shall again automatically
operate to limit the interest accrual rate to the maximum non-usurious rate. The
daily interest rates to be used in calculating interest at the maximum
non-usurious rate shall be determined by dividing the applicable maximum
non-usurious rate by the number of days in the calendar year for which such
calculation is being made. None of the terms and provisions contained in this
Note or in any other Debt Document which directly or indirectly relate to
interest shall ever be construed without reference to this paragraph, or be
construed to create a contract to pay for the use, forbearance or detention of
money at an interest rate in excess of the maximum non-usurious rate. If the
term of any obligation is shortened by reason of acceleration of maturity as a
result of any Default or by any other cause, or by reason of any required or
permitted prepayment, and if for that (or any other) reason Payee at any time,

                                   Page 2 of 4

<PAGE>

Promissory Note                            Master Security Agreement No. 6081111
                                                                 Schedule No. 05

including but not limited to, the stated maturity, is owed or receives (and/or
has received) interest in excess of interest calculated at the maximum
non-usurious rate, then and in any such event all of any such excess interest
shall be canceled automatically as of the date of such acceleration, prepayment
or other event which produces the excess, and, if such excess interest has been
paid to Payee, it shall be credited pro tanto against the then-outstanding
principal balance of Maker's obligations to Payee, effective as of the date or
dates when the event occurs which causes it to be excess interest, until such
excess is exhausted or all of such principal has been fully paid and satisfied,
whichever occurs first, and any remaining balance of such excess shall be
promptly refunded to its payor.

THE MAKER HEREBY UNCONDITIONALLY WAIVES ITS RIGHTS TO A JURY TRIAL OF ANY CLAIM
OR CAUSE OF ACTION BASED UPON OR ARISING OUT OF, DIRECTLY OR INDIRECTLY, THIS
NOTE, ANY OF THE RELATED DOCUMENTS, ANY DEALINGS BETWEEN MAKER AND PAYEE
RELATING TO THE SUBJECT MATTER OF THIS TRANSACTION OR ANY RELATED TRANSACTIONS,
AND/OR THE RELATIONSHIP THAT IS BEING ESTABLISHED BETWEEN MAKER AND PAYEE. THE
SCOPE OF THIS WAIVER IS INTENDED TO BE ALL ENCOMPASSING OF ANY AND ALL DISPUTES
THAT MAY BE FILED IN ANY COURT (INCLUDING, WITHOUT LIMITATION, CONTRACT CLAIMS,
TORT CLAIMS, BREACH OF DUTY CLAIMS, AND ALL OTHER COMMON LAW AND STATUTORY
CLAIMS.) THIS WAIVER IS IRREVOCABLE, MEANING THAT IT MAY NOT BE MODIFIED EITHER
ORALLY OR IN WRITING, AND THE WAIVER SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS,
RENEWALS, SUPPLEMENTS OR MODIFICATIONS TO THIS NOTE, ANY RELATED DOCUMENTS, OR
TO ANY OTHER DOCUMENTS OR AGREEMENTS RELATING TO THIS TRANSACTION OR ANY RELATED
TRANSACTION. IN THE EVENT OF LITIGATION, THIS NOTE MAY BE FILED AS A WRITTEN
CONSENT TO A TRIAL BY THE COURT.

This Note and any Security Agreement constitute the entire agreement of the
Maker and Payee with respect to the subject matter hereof and supersedes all
prior understandings, agreements and representations, express or implied.

No variation or modification of this Note, or any waiver of any of its
provisions or conditions, shall be valid unless in writing and signed by an
authorized representative of Maker and Payee. Any such waiver, consent,
modification or change shall be effective only in the specific instance and for
the specific purpose given.

Any provision in this Note or any Security Agreement which is in conflict with
any statute, law or applicable rule shall be deemed omitted, modified or altered
to conform thereto.

Upon receipt of an affidavit of an officer of Payee as to the loss, theft,
destruction or mutilation of this Note or any Debt Document which is not of
public record, and, in the case of any such loss, theft, destruction or
mutilation, upon surrender and cancellation of such Note or other Debt Document,
Maker will issue, in lieu thereof, a replacement Note or other Debt Document in
the same principal amount thereof and otherwise of like tenor.

It is understood and agreed that this Note and all of the Debt Documents were
negotiated and have been or will be delivered to Payee in the Commonwealth of
Virginia, which State the parties agree has a substantial relationship to the
parties and to the underlying transactions embodied by this Note and the Debt
Documents. Maker agrees to furnish to Payee at Payee's office in Alexandria, VA,
all further instruments, certifications and documents to be furnished hereunder.
The parties also agree that if collateral is pledged to secure the debt
evidenced by this Note, that the state or states in which such collateral is
located each have a substantial relationship to the parties and to the
underlying transaction embodied by this Note and the Debt Documents.

                                   Page 3 of 4

<PAGE>

Promissory Note                            Master Security Agreement No. 6081111
                                                                 Schedule No. 05

MAKER AGREES THAT THE PAYEE OF THIS NOTE SHALL HAVE THE OPTION BY WHICH STATE
LAWS THIS NOTE SHALL BE GOVERNED AND CONSTRUED: (A) THE LAWS OF THE COMMONWEALTH
OF VIRGINIA; OR (B) IF COLLATERAL HAS BEEN PLEDGED TO SECURE THE DEBT EVIDENCED
BY THIS NOTE, THEN BY THE LAWS OF THE STATE OR STATES WHERE THE COLLATERAL IS
LOCATED, AT PAYEE'S OPTION. THIS CHOICE OF STATE LAWS IS EXCLUSIVE TO THE PAYEE
OF THIS NOTE. MAKER SHALL NOT HAVE ANY OPTION TO CHOOSE THE LAWS BY WHICH THIS
NOTE SHALL BE GOVERNED. MAKER AND GUARANTORS HEREBY CONSENT TO THE EXERCISE OF
JURISDICTION OVER IT BY ANY FEDERAL COURT SITTING IN VIRGINIA OR ANY VIRGINIA
COURT SELECTED BY PAYEE, FOR THE PURPOSES OF ANY AND ALL LEGAL PROCEEDINGS
ARISING OUT OF OR RELATING TO THE NOTE, THE LOAN AGREEMENT AND ALL OTHER
DOCUMENTS. MAKER AND GUARANTORS IRREVOCABLY WAIVE, TO THE FULLEST EXTENT
PERMITTED BY LAW, ANY OBJECTION WHICH IT MAY NOW OR HEREAFTER HAVE TO THE LAYING
OF VENUE OF ANY SUCH PROCEEDING BROUGHT IN ANY SUCH COURT, ANY CLAIM BASED ON
THE CONSOLIDATION OF PROCEEDINGS IN SUCH COURTS IN WHICH PROPER VENUE MAY LIE IN
DIVERGENT JURISDICTIONS, AND ANY CLAIM THAT ANY SUCH PROCEEDING BROUGHT IN ANY
SUCH COURT HAS BEEN BROUGHT IN AN INCONVENIENT FORUM. MAKER AND GUARANTORS
HEREBY IRREVOCABLY WAIVE, TO THE FULLEST EXTENT PERMITTED BY LAW, ANY AND ALL
RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO
THIS NOTE, THE OTHER DOCUMENTS OR THE TRANSACTIONS CONTEMPLATED THEREBY.

                                        athenahealth, Inc.

/s/ Monica Nendza                       By: /s/ Carl Byers
-------------------------------------       ------------------------------------
(Witness)                               Name: Carl Byers
Monica Nendza                           Title: CFO
(Print name)
311 Arsenal St Watertown, MA 02472      Federal Tax ID #: 04-3387530
(Address)
                                        Address: 311 Arsenal Street
                                                 Watertown, MA 02472

                                   Page 4 of 4

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