Document:

<PAGE>   1
                                                                   EXHIBIT 10.40

CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY WITH
THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO THE
OMITTED PORTIONS.

                   SECOND AMENDMENT TO COLLABORATION AGREEMENT

         This Amendment (the "Amendment") to that certain Collaboration
Agreement (the "Agreement") entered into as of the 30th day of March, 1999, by
and between WebMD, Inc., a Georgia corporation ("Company"), and E.I. du Pont de
Nemours and Company, a Delaware corporation ("DuPont") is made on the 28th day
of May, 1999.

                                    RECITALS

         1.       DuPont and WebMD are parties to the Agreement;

         2.       DuPont and WebMD have agreed upon certain additional terms
with regard to the division of certain revenues according to the terms of the
Agreement; and

         3.       DuPont and WebMD desire to enter into this Amendment to
provide for such additional terms.

                               TERMS OF AMENDMENT

         1.       Schedule 1 of the Agreement is hereby deleted and replaced in
its entirety by the Schedule 1 attached hereto.

         IN WITNESS WHEREOF, DuPont and WebMD have executed this Amendment
effective as of the date hereof.

                                    E.I. du Pont de Nemours and Company

                                    By:  /s/
                                          -------------------------------------
                                    Its:
                                          -------------------------------------

                                    WebMD, Inc.

                                    By:  /s/
                                          -------------------------------------

                                    Its:
                                          -------------------------------------

<PAGE>   2

                                   Schedule 1

                           DuPont's Share of Revenues

<TABLE>
<CAPTION>
                                                    CONSUMER                      PROFESSIONAL
                                                    --------                      ------------
<S>  <C>                                        <C>                              <C>
1.   Advertising/Sponsorship                          [*]%                       [*]% until DuPont recovers
                                                                                 its out of pocket
                                                                                 subscription fees less
                                                                                 payments from Life Science
                                                                                 partners; [*]% thereafter

2.  Carriage Fees                                     [*]%                       [*]% Lounge and Library only

3.  Upsales on Services                               N/A                        [*]% on net revenue

4.  e-Commerce

    a.  bought through WebMD                    [*]% of net proceeds             [*]% of net proceeds

    b.  bought through DuPont                   [*]% of net proceeds             [*]% of net proceeds

    c.  E*Trade payments to WebMD               [*]% of net revenue              [*]% of net proceeds
        based on commissions on
        deposit accounts and
        securities trading
        commissions (the carriage
        fees element of the E*Trade
        relationship are covered in
        #2 above)
</TABLE>

Notes

1.       Revenue splits of advertising/sponsorship receipts shall be net of all
         direct third party vendor costs (e.g., DoubleClick commissions).

2.       Revenues derived from portal agreements (e.g., CNN, Lycos, MSN) are
         applied [*]% to DuPont and [*]% to WebMD for the carriage fees paid
         until WebMD recovers the portal fees paid, and are then applied as
         shown above.

3.       Revenue splits of e-commerce receipts shall be net of discounts, bad
         debts, returns and direct costs such as advertising, sales, product
         costs, distribution and other costs.

[*] CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED
SEPARATELY WITH THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED
WITH RESPECT TO THE OMITTED PORTIONS.

                                      -2-
<PAGE>   3

4.       Consumer split is for 3 years on e-commerce, and non-pharmaceutical
         advertising, sponsorship and carriage, and 5 years on pharmaceutical
         advertising, sponsorship and carriage; professional split is for 5
         years except as otherwise noted in Section 4.5 of this Agreement.

5.       WebMD and DuPont will negotiate in good faith for amendments to the
         professional revenue split described above to accommodate proposals by
         third parties to sponsor additional physician subscribers to WebMD.

6.       DuPont's portion of the revenue derived from the professional site
         shall be one-half of the percentages stated in the "Professional"
         column of this Schedule 1 pertaining to or derived from the physicians
         subscribers to the WebMD service to be sponsored by DuPont under this
         Agreement and/or the physician subscribers to the WebMD service to be
         sponsored by Microsoft Corporation under that certain Microsoft
         Collaboration and Cross-Promotion Agreement between Microsoft
         Corporation and WebMD, Inc., dated May 6, 1999.

7.       DuPont's right to the revenue derived from Advertising/Sponsorship on
         the professional site shall begin on the day it begins sponsorship of
         physician subscribers to the WebMD service other than those subscribers
         referred to on Schedule 2 of this Agreement.

                                      -3-<PAGE>   1

                                                                   EXHIBIT 10.41

                             EMPLOYMENT AGREEMENT
                             --------------------

          THIS EMPLOYMENT AGREEMENT (the "Agreement") is made as of the 30th day
of September, 1998, by and between WebMD, INC., a Georgia corporation ("WebMD")
and JEFFREY T. ARNOLD, an individual (the "Executive"), and is effective as of
the date hereof.

          WHEREAS, Executive has made and is expected to continue to make a
significant contribution to the success and development of WebMD in his role as
Chairman and Chief Executive Officer of WebMD; and

          WHEREAS, Executive is willing to render services to WebMD on the terms
and subject to the conditions set forth herein.

          NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged by Executive and WebMD including,
without limitation, the promises and covenants described herein, the parties
hereto, intending to be legally bound, hereby agree as follows:

                                    ARTICLE I
                                    ---------

                                   EMPLOYMENT
                                   ----------

          SECTION 1.1  Term of Employment.  The term of Executive's employment
                       ------------------
hereunder shall continue for a period of two (2) years from the effective date
hereof, unless earlier terminated as provided in this Agreement.  At the end of
the second year of the initial two-year term, and at the end of each year-long
extension hereof, this Agreement shall automatically be extended for an
additional one-year term unless either party hereto shall give written notice of
its or his intent to terminate three

<PAGE>   2

hundred sixty (360) days prior to the end of the initial two-year term or any
year-long extension hereof.

          SECTION 1.2  Duties and Responsibilities of Executive.  Executive is
                       ----------------------------------------
hereby employed full time as the Chairman and Chief Executive Officer of WebMD,
shall do and perform all services and acts necessary or advisable to fulfill the
duties of such offices, and shall conduct and perform such additional services
and activities as may be determined from time to time by the Board of Directors
of WebMD.  During the term of this Agreement, Executive shall devote his full
time, energy and skill to the business of WebMD and to the promotion of WebMD's
interests, and Executive acknowledges that he has a duty of loyalty to WebMD and
shall not engage in, directly or indirectly, any other business or activity that
could materially and adversely affect WebMD's business or the Executive's
ability to perform his duties under this Agreement.

          In his capacity as an officer of WebMD, Executive shall report to the
Board of Directors of WebMD.  Executive's authority and responsibility in WebMD
shall at all times be subject to the review and discretion of the Board of
Directors, who shall have the final authority to make decisions regarding the
business of WebMD.

          SECTION 1.3  Compensation.  For all services to be rendered by
                       ------------
Executive under this Agreement, WebMD shall pay Executive as follows:

          (a) Base Salary.  Executive shall be paid an annual gross salary of
              -----------
$180,000 payable bi-weekly.  At the sole discretion of the Board of Directors of
WebMD, Executive's annual gross salary may be increased, from time to time,
throughout the term of this Agreement, the amount of any such increase to be
determined by the Board of Directors (or by the Compensation Committee thereof).

                                       2

<PAGE>   3

          (b) Annual Bonus.  Executive shall be paid an annual bonus in an
              ------------
amount approved by the Board of Directors of WebMD (or by the Compensation
Committee thereof).

          SECTION 1.4  Benefits.
                       --------

          (a) Vacation.  Executive shall be entitled to four weeks paid vacation
              --------
annually.  Any vacation not used during any calendar year shall be forfeited
except that one week's unused vacation may be carried forward to the year
following the year in which such vacation entitlement accrued.

          (b) Life, Disability and Retirement Programs.  Executive shall be
              ----------------------------------------
entitled to participate in any life, disability and retirement programs that are
generally offered to or provided for the senior management personnel of WebMD,
said programs to be approved by the Board of Directors.

          (c) Group Insurance.  Executive shall be entitled to participate in
              ---------------
such group health and dental insurance programs (including family coverage) as
may from time to time be offered generally to all of the other members of the
senior management personnel of WebMD and its subsidiaries.  Executive's
participation shall be on the same basis (including cost provisions) as such
other members of senior management.

          SECTION 1.5  Stock Options.  WebMD shall grant Executive options to
                       -------------
purchase One Million (1,000,000) shares of Common Stock, Series D, of WebMD (the
"Options"), such Options to be subject to the terms and conditions set forth
below.  The Options shall be adjusted for any change in the total issued common
shares of WebMD (of any class) due to stock splits, stock dividends and similar
transactions.

                 (a)   Grant, Vesting and Exercise. Options to purchase One
                       ---------------------------
Million (1,000,000) shares of Common Stock, Series D, shall be granted as of the
effective date of this Agreement and at

                                       3

<PAGE>   4

the exercise price of fifteen dollars ($15.00) per share. Said Options shall
vest and become exercisable in accordance with the following schedule and shall
remain exercisable through the fourth anniversary of the effective date of this
Agreement, at which time such Options shall expire unless earlier terminated in
accordance with the provisions hereof.

<TABLE>
<CAPTION>
          --------------------------------------------------------------
            OPTIONS FOR NUMBER OF SHARES   DATE VESTED AND EXERCISABLE
          <S>                              <C>
          --------------------------------------------------------------
                       333,333                  September 30, 1998
          --------------------------------------------------------------
                       166,667                  September 30, 1999
          --------------------------------------------------------------
                       166,667                  September 30, 2000
          --------------------------------------------------------------
                       333,333                  September 30, 2001
          --------------------------------------------------------------
</TABLE>

          At the effective time and date of a registration statement filed under
the 1933 Act for a public offering of any series of WebMD's shares, one-half (
1/2) of the Options held by Executive which then have not vested and become
exercisable under the above vesting schedule will immediately vest and become
exercisable.  All Options shall vest and become exercisable upon a Change of
Control of WebMD.  For purposes of this Section 1.5(a), a "Change of Control"
shall mean a change of the possession, direct or indirect, of the power to
direct or cause the direction of management and policies of WebMD, whether
through ownership of voting securities, by contract (other than a commercial
contract for goods or non-management services), or otherwise.  Without
limitation, a Change of Control shall be deemed to have occurred if any person
or entity that is not on the date hereof the beneficial owner of any securities
of WebMD becomes the beneficial owner, directly or indirectly, of 20% or more of
the combined voting power of WebMD's outstanding voting securities ordinarily
having the right to vote for the election of directors of WebMD.

                                       4

<PAGE>   5

          (b)  Return of Options and Repurchase of Shares.
               ------------------------------------------

               (i)  In the event that Executive voluntarily resigns his
employment with WebMD prior to September 30, 2000, other than in a resignation
following a Constructive Termination (as defined in Section 3.2(b) below) all
then outstanding Options that have been issued to Executive shall be canceled as
of the date of Executive's notice of voluntary resignation. In the event that
Executive voluntarily resigns his employment with WebMD after September 30,
2000, or if Executive resigns his employment with WebMD prior to September 30,
2000 in a resignation following a Constructive Termination, all then outstanding
and exercisable options shall remain exercisable in full for a period of 120
days after the date of such notice of voluntary resignation. WebMD shall have
the option at its sole discretion to purchase any unexercised Options from the
Executive at a price per share equal to the difference between the exercise
price of such Options and the per share Fair Market Value of the shares of
Common Stock underlying such Options determined as of or before the thirtieth
(30/th/) day following the date such notice of voluntary resignation was given,
with the Fair Market Value of such shares of Common Stock to be determined in
the manner set forth in clause (iv) of this Subsection 1.5(b) set forth below.
Furthermore, in the event Executive voluntarily resigns his employment with
WebMD and no registration statement filed under the 1933 Act for a public
offering of any series of WebMD's shares has become effective, then WebMD in its
sole discretion may repurchase any shares of Common Stock purchased by Executive
through the exercise of any Options for an amount equal to the Fair Market Value
of such shares of Common Stock. Any such repurchase of shares by WebMD shall be
accomplished within 180 days after such receipt of such notice of resignation.

               (ii) In the event that Executive's employment with WebMD shall be
terminated by WebMD for Cause (as defined in Section 3.1) after September 30,
1999 or at any time without Cause, all then outstanding and unexercised Options
shall become exercisable in full as of the date such notice of termination was
given by WebMD and shall remain exercisable in full for a

                                       5

<PAGE>   6

period of 120 days after the date such notice of termination was given by WebMD.
WebMD shall have the option at its sole discretion to purchase any unexercised
Options from the Executive at a price per share equal to the difference between
the exercise price of such Options and the per share Fair Market Value of the
shares of Common Stock underlying such Option determined as of or before the
thirtieth (30/th/) day following the date such notice of termination was given
by WebMD, with the Fair Market Value of such shares of Common Stock to be
determined in the manner set forth in clause (iv) of Subsection 1.5(b) appearing
below. Furthermore, if no registration statement filed under the 1933 Act for a
public offering of any series of WebMD's Common Stock has become effective, then
WebMD in its sole discretion may repurchase any shares of Common Stock purchased
by Executive through the exercise of any Options for an amount equal to the Fair
Market Value of the shares of Common Stock. Any such repurchase of the shares of
Common Stock shall be accomplished within 180 days after the date such notice of
termination was given by WebMD.

          (iii)     In the event Executive's employment with WebMD shall be
terminated by WebMD for Cause on or before September 30, 1999, all then
outstanding Options will be canceled.

          (iv)      The Fair Market Value of a share of Common Stock, Series D,
on the date specified by WebMD shall mean (i) the closing sales price of the
Common Stock of WebMD on such date on the national securities exchange (treating
the Nasdaq National Market System as a national securities exchange) having the
greatest volume of trading in the Common Stock during the thirty (30) day period
preceding the day the value is to be determined or, if such exchange was not
open for trading on such date, the next preceding date on which it was open;
(ii) if the Common Stock is not traded on any national securities exchange, the
average of the closing high bid and low asked prices of the Common Stock on the
over-the-counter market, in arms-length transactions not involving an affiliate
of WebMD, on the day such value is to be determined, or in the absence of
closing bids on such day, the closing bids on the next preceding day on which
there were bids; (iii) if

                                       6

<PAGE>   7

the Common Stock also is not traded on the over-the-counter market, the average
net proceeds per share received or the price paid by WebMD with respect to
shares of Common Stock of any series sold or purchased by WebMD in arms length
transactions during the ninety (90) days preceding the day the value is to be
determined; or (iv) if no such purchases or sale transactions by WebMD have
occurred within such ninety (90) day period, the Fair Market Value as determined
in good faith by the Board of Directors of WebMD based on (a) such relevant
facts as may be available to such Board, which may include opinions of
independent experts, the price at which recent purchases or sales have been made
by third parties, the per share book value of the Common Stock, and WebMD's
current and future earnings or (b) an independent appraisal, conducted at
WebMD's expense, by a qualified financial appraiser who is reasonably
satisfactory to both WebMD and Executive, provided that the selection of method
(a) or (b) shall be by mutual agreement of the Board and Executive.

          (c)  Initial Public Offering.  In the event that WebMD shall undertake
               -----------------------
an initial public offering ("IPO") of any series of its stock, pursuant to which
it files a registration statement in accordance with the 1933 Act, notice of the
filing of such registration statement shall be provided to Executive, and upon
the effective date of such registration statement (i) pursuant to and in
accordance with the Restated Shareholders Agreement, each one (1) outstanding
share of Common Stock, Series D, will become one (1) share of Common Stock
without series designation, (ii) pursuant to and in accordance with Section
1.5(a) above, one-half ( 1/2) of the Executive's then-unvested Options shall
immediately vest and become exercisable, and (iii) WebMD shall have no right to
repurchase any shares of Common Stock obtained by his exercise of any Options.

  SECTION 1.6  Business Expenses.  Executive shall be entitled to reimbursement
               -----------------
of all ordinary and necessary business expenses reasonably incurred for business
travel, communications (including cell phone and pager), entertainment and meals
in connection with the performance of Executive's duties under this Agreement in
accordance with WebMD's established policies for reimbursement of business
expenses including an automobile allowance of Seven Hundred Dollars

                                       7

<PAGE>   8

($700.00) per month. WebMD will also pay the initiation fees, membership dues
and assessments for Executive's family membership in a club in the Atlanta area
acceptable to WebMD and Executive which would permit Executive to engage in
business entertainment for the benefit of WebMD. WebMD expects Executive to
attend and participate in continuing education seminars and courses with respect
to the health industry and business management related to his duties, and WebMD
will reimburse all ordinary and necessary expenses of such attendance and
participation.

                                  ARTICLE II
                                  ----------

                            COVENANTS OF EXECUTIVE
                            ----------------------

     SECTION 2.1  Confidentiality.  Executive recognizes the interest of WebMD
                  ---------------
in maintaining the confidential nature of its proprietary and other business and
commercial information.  In connection therewith, Executive covenants that
during the term of his employment with WebMD under this Agreement, and for a
period of one (1) year thereafter, Executive shall not, directly or indirectly,
except as authorized by the Board of Directors, publish, disclose or use for his
own benefit or for the benefit of a business or entity other than WebMD or
otherwise, any secret or confidential matter, or proprietary or other
information not in the public domain that was acquired by Executive during his
employment, relating to WebMD, or any of its subsidiaries' businesses,
operations, customers, suppliers, products, employees, financial affairs or
industrial practices, technology, know-how or intellectual property or other
similar information (the "Proprietary Information").

     Executive will abide by WebMD's policies and regulations, as established
from time to time, for the protection of its Proprietary Information.  Executive
acknowledges that all records, files, data, documents and the like relating to
suppliers, customers, costs, prices, systems, methods, personnel, technology and
other materials relating to WebMD or its affiliated entities shall be and remain
the sole property of WebMD and/or such affiliated entity and shall, upon the
request of WebMD, turn

                                       8

<PAGE>   9

over all copies of such Proprietary Information to WebMD (together with a
written statement certifying as to his compliance with the foregoing).

     SECTION 2.2    Non-Solicitation of Customers and Non-Competition.  During
                    -------------------------------------------------
the term of his employment with WebMD, and for a period of one (1) year
thereafter, Executive shall not directly or indirectly, through one or more
intermediaries or otherwise, solicit or accept, or attempt to solicit or accept
any business from any customer or client of WebMD, including actively sought
prospective customers, with whom Executive had material contact, for the purpose
of providing services or products to such customer or client which are
competitive with the services or products offered or provided by WebMD.

     During the Executive's employment with WebMD, and for the one (1) year
period following the termination of Executive's employment with WebMD for any
reason, Executive shall not, without the prior written consent of the Board of
Directors, which consent may be withheld at the  sole discretion of the Board of
Directors, perform the Services (as defined below) in the Territory (as defined
below) on behalf of any entity (other than WebMD) in the Business (as defined
below).  For purposes hereof, "Services" means the oversight and management of
sales, marketing, strategic planning and operations.  For purposes hereof,
"Territory" means the geographic area within a 50 mile radius of the current
principal executive offices of WebMD.  For purposes hereof, "Business" means the
delivery of information and communications services to the healthcare industry.

     SECTION 2.3    Non-Solicitation of Employees.  During the term of
                    -----------------------------
Executive's employment with WebMD, and for a period of one (1) year thereafter,
Executive shall not, directly or indirectly, through one or more intermediaries
or otherwise, employ, induce, solicit for employment, or assist others in
employing, inducing or soliciting for employment, any individual who is or was
an employee of WebMD and with whom Executive had material contact in an attempt
to have any such individual work in any other entity in the Business (as defined
above).

                                       9

<PAGE>   10

     SECTION 2.4    Trade Secrets.  The Executive shall not, at any time, either
                    -------------
during the term of his employment or after any termination of employment, use or
disclose any Trade Secrets (as defined under applicable law) of WebMD or its
subsidiaries, except in fulfillment of his duties as the Executive during his
employment, for so long as the pertinent information or data remain Trade
Secrets, whether or not the Trade Secrets are in written or tangible form.

                                  ARTICLE III
                                  -----------

                           TERMINATION OF EMPLOYMENT
                           -------------------------

     SECTION 3.1    Termination by Company.  Executive's employment may be
                    ----------------------
terminated by WebMD by giving notice during the term of this Agreement upon the
occurrence of one or more of the following events:

         (a) Executive's death or disability which renders Executive incapable
of performing his duties for more than one hundred twenty (120) calendar days in
one calendar year or within consecutive calendar years (termination under this
Section 3.1(a) shall be deemed termination without Cause);

         (b) for any reason (other than those set forth in Section 3.1(c))
following a determination by the Board of Directors of  WebMD to terminate
Executive's employment (termination under this Section 3.1(b) shall be deemed
termination without Cause); or

         (c) "for Cause," which for purposes of this Agreement shall mean that
the Executive shall have committed or engaged in:

                                       10

<PAGE>   11

          (i)    an intentional act of fraud, embezzlement or theft in
connection with his duties or in the course of his employment with WebMD;

          (ii)   any intentional wrongful damage to any material assets of
WebMD;

          (iii)  any intentional wrongful disclosure of Proprietary Information
or Trade Secrets of WebMD or its affiliates;

          (iv)   a felony or any similar crime involving dishonesty or  moral
turpitude;  or

          (v)    the habitual and debilitating use of alcohol or drugs.

  SECTION 3.2    Severance.  For purpose of this Agreement, Executive's
                 ---------
entitlement to any severance payments upon termination of his employment shall
be as set forth below:

          (a)    Termination Without Cause.  Executive shall be entitled to 12
                 -------------------------
months salary continuation, payable in bi-weekly installments, and continued
participation in WebMD's group health and dental insurance program upon the
timely periodic payment of the amount required by WebMD for employees to
maintain family coverage for such programs, as severance pay in the event that
the Executive's employment is terminated without Cause, commencing as of the
date of Executive's death or disability for purposes of Section 3.1(a), or the
date specified in a notice given under Section 3.1(b), or the date of
Constructive Termination (as defined below).  Executive's resignation following
a Constructive Termination shall be deemed a termination without Cause.

                                       11

<PAGE>   12

          (b)    Voluntary Termination.  Executive shall not receive any
                 ---------------------
severance pay in the event that he voluntarily resigns his employment with WebMD
(other than a resignation following a Constructive Termination) unless such
severance pay is approved by the Board of Directors of WebMD in its sole
discretion. Executive shall provide a minimum of thirty (30) days prior notice
to the Board of Directors of his resignation. In the event Executive shall
provide thirty (30) days prior written notice of his intent to resign, WebMD may
accept such resignation effective as of any date during such thirty (30) day
period as WebMD deems appropriate, provided that Executive shall receive from
WebMD his salary and be entitled to participate at WebMD's expense in any
company-sponsored benefit programs in which he was a participant as of the
effective date of his resignation for the duration of such thirty (30) day
period. For purposes of this Agreement, "Constructive Termination" shall mean:

              (i) Such change in duties or position as:

                  (a) The assignment (other than an occasional temporary
assignment) to Executive of any duties not commensurate with Executive's
position, duties, responsibilities and status with WebMD;

                  (b) A material change in Executive's reporting
responsibilities, (i.e., reporting to a lower tier) or a diminution in
Executive's titles or offices; or

                  (c) A material diminution of Executive's authority or
responsibilities.

                                       12

<PAGE>   13

        (ii)  A reduction in Executive's base salary specified in Section 1.3(a)
for the calendar year 1998, and a reduction in Executive's base salary in effect
for the prior calendar year for all succeeding years (other than pro rata
reductions in compensation for all senior management of WebMD and its
subsidiaries).

        (iii) The requirement that Executive be based anywhere other than
within 50 miles of WebMD's current offices.

    (c) For Cause.  Executive shall not be entitled to any severance pay
        ---------
whatsoever in the event that his employment is terminated "for Cause" pursuant
to Section 3.1(c) of this Agreement, unless severance pay is approved by the
Board of Directors of WebMD in its sole discretion.

                                  ARTICLE IV
                                  ----------

                              GENERAL PROVISIONS
                              ------------------

  SECTION 4.1  Withholding of Taxes.  WebMD may withhold from any amounts
               --------------------
payable under this Agreement all federal, state, city or other taxes and
withholdings as shall be required pursuant to any applicable law, rule or
regulation.

  SECTION 4.2  Notice.  For purposes of this Agreement, all communications
               ------
including, without limitation, notices, consents, requests or approvals,
provided for herein shall be in writing and shall be deemed to have been duly
given (i) when personally delivered, (ii) on the day of transmission when given
by facsimile transmission with confirmation of receipt, (iii) on the following
day if submitted to a nationally recognized courier service, or (iv) five (5)
business days after having been mailed by United States registered mail or
certified mail, return receipt requested,

                                       13

<PAGE>   14

postage prepaid, addressed to WebMD (to the attention of the Secretary of WebMD)
at its principal executive office or to Executive at his principal residence, or
to such other address as any party may have furnished to the other in writing
and in accordance herewith, except that notices of change of address shall be
effective only upon receipt.

  SECTION 4.3  Governing Law.  The validity, interpretation, construction,
               -------------
performance and enforcement of this Agreement shall be governed by the laws of
the State of Georgia, without giving effect to the principles of conflict of law
of such State.

  SECTION 4.4  Validity.  If any provision of this Agreement or the application
               --------
of any provision hereof to any person or circumstances is held invalid,
unenforceable or otherwise illegal, the remainder of this Agreement and the
application of such provision to any other person or circumstances shall not be
affected, and the provision so held to be invalid, unenforceable or otherwise
illegal shall be reformed to the extent (and only to the extent) necessary to
make it valid, enforceable and legal; provided, however, if the provision so
held to be invalid, unenforceable or otherwise illegal constituted a material
inducement to a party's execution and delivery of this Agreement, such provision
shall not be reformed unless prior to any reformation that party agrees to be
bound by the reformation.

  SECTION 4.5  Entire Agreement.  This Agreement supersedes any other
               ----------------
agreements, oral or written, between the parties with respect to the subject
matter hereof, and contains all of the agreements and understandings between the
parties with respect to the employment of Executive by WebMD.  Any waiver or
modification of any term of this Agreement shall be effective only if it is set
forth in a writing signed by all parties hereto.

                                       14

<PAGE>   15

  SECTION 4.6  Successors and Binding Agreement.
               --------------------------------

          (a) This Agreement shall be binding upon and inure to the benefit of
WebMD and any Successor of or to WebMD, but shall not be otherwise be assignable
or delegable by WebMD.  "Successor" shall mean any successor in interest,
including, without limitation, any entity, individual or group of persons
acquiring directly or indirectly all or substantially all of the business or
assets of WebMD, whether by sale, merger, consolidation, reorganization or
otherwise.

          (b) WebMD shall require any Successor to agree at the time of becoming
a Successor to perform this Agreement to the same extent as the original parties
would be required if no succession had occurred.

          (c) This Agreement shall inure to the benefit of and be enforceable by
Executive's personal or legal representatives, executors, administrators, heirs,
distributees and legatees.

          (d) This Agreement is personal in nature and neither of the parties
shall, without the consent of the other, assign, transfer or delegate this
Agreement or any rights or obligations hereunder except as expressly provided in
this Section 4.6.

  SECTION 4.7  Captions.  The captions in this Agreement are solely for
               --------
convenience of reference and shall not be given any effect in the construction
or interpretation of this Agreement.

                                       15

<PAGE>   16

  SECTION 4.8  Miscellaneous.  No provisions of this Agreement may be modified,
               -------------
waived or discharged unless such waiver, modification or discharge is agreed to
in a writing signed by Executive and WebMD.  No waiver by a party hereto at any
time of any breach by another party hereto or compliance with any condition or
provision of this Agreement to be performed by such other party shall be deemed
a waiver of similar or dissimilar provisions or conditions at the same or at any
prior or subsequent time.

  SECTION 4.9  Counterparts.  This Agreement may be executed in one or more
               ------------
counterparts, each of which shall be deemed to be an original but all of which
together will constitute one and the same Agreement.

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

                                        WebMD, INC.

                                        By:  /s/ W. Michael Heekin
                                           ------------------------------
                                           W. Michael Heekin
                                           Chief Operating Officer

                                        EXECUTIVE

                                             /s/ Jeffrey T. Arnold
                                        ---------------------------------
                                        Jeffrey T. Arnold

                                       16

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