<PAGE>   1
                                                                  EXHIBIT 10.73

                             IXL ENTERPRISES, INC.

                         TESSERA 1995 STOCK OPTION PLAN

              (AS AMENDED AND RESTATED EFFECTIVE JANUARY 31, 2000)

1.       PURPOSE.

         Effective as of December 19, 1995, Tessera Enterprises, Inc. (f/k/a
Tessera, Inc.; "Tessera") adopted the Tessera, Inc. 1995 Stock Option Plan (the
"Tessera Plan"), and thereafter granted options pursuant to the Tessera Plan.
Effective as of January 11, 2000 (the "Effective Time"), Tessera was merged
into iXL-Massachusetts, Inc., a Delaware corporation and a subsidiary of iXL
Enterprises, Inc., a Delaware corporation (the "Company") pursuant to the terms
of a Merger Agreement dated Agreement and Plan of Merger, dated as of October
4, 1999, by and among iXL Enterprises, Inc., iXL-Massachusetts, Inc., and
Tessera Enterprise Systems, Inc. (the "Merger Agreement"). Pursuant to Section
6.6(b) of the Merger Agreement, the Company assumed as of the Effective Time
the obligations of Tessera under the Tessera Plan, and the shares underlying
the options granted under the Tessera Plan became options with respect to the
common stock, par value $0.01, of the Company (the "Common Stock"), and the
number of shares underlying those options that are exerciseable with respect to
Company Stock, and the exercise price for such options, was adjusted inversely,
based upon the conversion ratio provided in the Merger Agreement for Tessera
Stock. As a result of the foregoing, the Tessera Plan is hereby amended and
restated to effectuate the requirements under the Merger Agreement.

         The purpose of this plan (the "Plan") is to secure for the Company and
its shareholders the benefits arising from capital stock ownership by
employees, officers, directors, consultants or advisors who are expected to
contribute to the Company's future growth and success. For purposes of this
Plan and the determination of eligibility for the grant of options hereunder,
and unless the context otherwise requires, the term "Company" shall include any
future parent or subsidiary corporation of the Company as defined in Sections
424(e) and 424(f) of the Internal Revenue Code of 1986, as amended or replaced
from time to time (the "Code"). Those provisions of the Plan which make express
reference to Section 422 of the Code shall apply only to Incentive Stock
Options (as that term is defined in the Plan).

2.       TYPE OF OPTIONS AND ADMINISTRATION.

         (a)      Types of Options. Options granted pursuant to the Plan may be
either incentive stock options ("Incentive Stock Options") meeting the
requirements of Section 422 of the Code or non-statutory options which are not
intended to meet the requirements of Section 422 of the Code ("Non-Statutory
Options").


<PAGE>   2

         (b)      Administration.

                  (i) The Plan will be administered by the Board of Directors
of the Company, whose construction and interpretation of the terms and
provisions of the Plan shall be final and conclusive. The Board of Directors
may in its sole discretion grant options to purchase shares of the Company's
common stock, without par value ("Common Stock"), and issue shares upon
exercise of such options as provided in the Plan. The Board shall have
authority, subject to the express provisions of the Plan, to construe the
respective option agreements and the Plan, to prescribe, amend and rescind
rules and regulations relating to the Plan, to determine the terms and
provisions of the respective option agreements, which need not be identical,
and to make all other determinations which are, in the judgment of the Board of
Directors, necessary or desirable for the administration of the Plan. The Board
of Directors may correct any defect, supply any omission or reconcile any
inconsistency in the Plan or in any option agreement in the manner and to the
extent it shall deem expedient to carry the Plan into effect and it shall be
the sole and final judge of such expediency. No director or person acting
pursuant to authority delegated by the Board of Directors shall be liable for
any action or determination under the Plan made in good faith.

                  (ii) The Board of Directors may, to the full extent permitted
by or consistent with applicable laws or regulations and Section 3(b) of this
Plan delegate any or all of its powers under the Plan to a committee (the
"Committee") appointed by the Board of Directors, and if the Committee is so
appointed all references to the Board of Directors in the Plan shall mean and
relate to such Committee.

         (c)      Applicability of Rule 16b-3. Those provisions of the Plan
which make express reference to Rule 16b-3 promulgated under the Securities
Exchange Act of 1934 (the "Exchange Act"), or any successor rule ("Rule
16b-3"), or which are required in order for certain option transactions to
qualify for exemption under Rule 16b-3, shall apply only if and when holders of
the Company's stock may be subject to such rule, and then only to such persons
as are required to file reports under Section 16(a) of the Exchange Act (a
"Reporting Person").

3.       ELIGIBILITY.

         (a)      General. Options may be granted to persons who are, at the
time of grant, employees, officers or directors of, or consultants or advisors
to, the Company; provided, that the class of employees to whom Incentive Stock
Options may be granted shall be limited to employees. A person who has been
granted an option may, if he or she is otherwise eligible, be granted
additional options if the Board of Directors shall so determine.

         (b)      Grant of Options to Directors and Officers. From and after any
registration of the Common Stock of the Company under the Exchange Act, and so
long as Rule 16b-3 shall so require in order for certain option transactions to
qualify for exemption, the selection of a director or an officer (as the terms
"director" and "officer" are defined for purposes of Rule 16b-3) as a recipient
of an option, the timing of the option grant, the exercise price of the option
and the number of shares subject to the option shall be determined either (i)
by the Board of


                                       2
<PAGE>   3

Directors, of which all members shall be "disinterested persons" (as defined in
and interpreted under Rule 16b-3), or (ii) by two or more directors having full
authority to act in the matter, each of whom shall be a "disinterested person."
In the event Rule 16b-3 shall at any time provide for additional or different
procedures to qualify for such exemption, the Board of Directors may implement
such procedures.

4.       STOCK SUBJECT TO PLAN.

         Subject to adjustment as provided in Section 15 below, the maximum
number of shares of Common Stock which may be issued and sold under the Plan is
634,392 shares. If an option granted under the Plan shall expire or terminate
for any reason without having been exercised in full, the unpurchased shares
subject to such option shall again be available for subsequent option grants
under the Plan. If shares issued upon exercise of an option under the Plan are
tendered to the Company in payment of the exercise price of an option granted
under the Plan, such tendered shares shall again be available for subsequent
option grants under the Plan; provided, that in no event shall such shares be
made available for issuance to Reporting Persons or pursuant to exercise of
Incentive Stock Options.

5.       FORMS OF OPTION AGREEMENTS.

         As a condition to the grant of an option under the Plan, each
recipient of an option shall execute an option agreement in such form not
inconsistent with the Plan as may be approved by the Board of Directors. Such
option agreements may differ among recipients.

6.       PURCHASE PRICE.

         (a)      General. Subject to Section 3(b), the purchase price per share
of stock deliverable upon the exercise of an option shall be determined by the
Board of Directors, provided, however, that in the case of an Incentive Stock
Option, the exercise price shall not be less than 100% of the fair market value
of such stock, as determined by the Board of Directors, at the time of grant of
such option, or less than 110% of such fair market value in the case of options
described in Section 11(b).

         (b)      Payment of Purchase Price. Options granted under the Plan may
provide for the payment of the exercise price by delivery of cash or a check to
the order of the Company in an amount equal to the exercise price of such
options, or, to the extent provided in the applicable option agreement, (i) by
delivery to the Company of shares of Common Stock of the Company already owned
by the optionee having a fair market value equal in amount to the exercise
price of the options being exercised or (ii) by any other means (including,
without limitation, by delivery of a promissory note of the optionee payable on
such terms as are specified by the Board of Directors) which the Board of
Directors determines are consistent with the purpose of the Plan and with
applicable laws and regulations (including, without limitation, the provisions
of Regulation T promulgated by the Federal Reserve Board). The fair market
value of any shares of the Company's Common Stock or other non-cash
consideration which may be delivered upon exercise of an option shall be
determined by the Board of Directors.


                                       3
<PAGE>   4

7.       OPTION PERIOD.

         Each option and all rights thereunder shall expire on such date as
shall be set forth in the applicable option agreement, except that, in the case
of an Incentive Stock Option, such date shall not be later than ten years after
the date on which the option is granted, or five years in the case of options
described in Section 11(b), and, in all cases, options shall be subject to
earlier termination as provided in the Plan.

8.       EXERCISE OF OPTIONS.

         Each option granted under the Plan shall be exercisable either in full
or in installments at such time or times and during such period as shall be set
forth in the agreement evidencing such option, subject to the provisions of the
Plan.

9.       NONTRANSFERABILITY OF OPTIONS.

         Options shall not be assignable or transferable by the person to whom
they are granted, either voluntarily or by operation of law, except by will or
the laws of descent and distribution, and, during the life of the optionee,
shall be exercisable only by the optionee; provided, however, that
Non-Statutory Options may be transferred pursuant to a qualified domestic
relations order (as defined for purposes of Rule 16b-3).

10.      EFFECT OF TERMINATION OF EMPLOYMENT OR OTHER RELATIONSHIP.

         Except as provided in Section 1l(d) with respect to Incentive Stock
Options, and subject to the provisions of the Plan, the Board of Directors
shall determine the period of time during which an optionee may exercise an
option following (i) the termination of the optionee's employment or other
relationship with the Company, or (ii) the death or disability of the optionee.
Such periods shall be set forth in the agreement evidencing such option.

11.      INCENTIVE STOCK OPTIONS.

         Options granted under the Plan which are intended to be Incentive
Stock Options shall be subject to the following additional terms and
conditions:

         (a)      Express Designation. All Incentive Stock Options granted under
the Plan shall, at the time of grant, be specifically designated as such in the
option agreement covering such Incentive Stock Options.

         (b)      10% Shareholder. If any employee to whom an Incentive Stock
Option is to be granted under the Plan is, at the time of the grant of such
option, the owner of stock possessing more than 10% of the total combined
voting power of all classes of stock of the Company (after taking into account
the attribution of stock ownership rules of Section 424(d) of the Code), then


                                       4
<PAGE>   5

the following special provisions shall be applicable to the Incentive Stock
Option granted to such individual:

                  (i)   The purchase price per share of the Common Stock subject
to such Incentive Stock Option shall not be less than 110% of the fair market
value of one share of Common Stock at the time of grant; and

                  (ii)  the option exercise period shall not exceed five years
from the date of grant.

         (c)      Dollar Limitation. For so long as the Code shall so provide,
options granted to any employee under the Plan (and any other incentive stock
option plans of the Company) which are intended to constitute Incentive Stock
Options shall not constitute Incentive Stock Options to the extent that such
options, in the aggregate, become exercisable for the first time in any one
calendar year for shares of Common Stock with an aggregate fair market value
(determined as of the respective date or dates of grant) of more than $100,000.

         (d)      Termination of Employment, Death or Disability. No Incentive
Stock Option may be exercised unless, at the time of such exercise, the
optionee is, and has been continuously since the date of grant of his or her
option, employed by the Company, except that:

                  (i)   an Incentive Stock Option may be exercised within the
period of three months after the date the optionee ceases to be an employee of
the Company (or within such lesser period, including under specified
circumstances, as may be provided in the applicable option agreement),
provided, that the agreement with respect to such option may designate a longer
exercise period and that the exercise after such three-month period shall be
treated as the exercise of a non-statutory option under the Plan;

                  (ii)  if the optionee dies while in the employ of the Company,
or within three months after the optionee ceases to be such an employee, the
Incentive Stock Option may be exercised by the person to whom it is transferred
by will or the laws of descent and distribution within the period of one year
after the date of death (or within such lesser period as may be specified in
the applicable option agreement); and

                  (iii) if the optionee becomes disabled (within the meaning of
Section 22(e)(3) of the Code or any successor provision thereto) while in the
employ of the Company, the Incentive Stock Option may be exercised within the
period of one year after the date the optionee ceases to be such an employee
because of such disability (or within such lesser period as may be specified in
the applicable option agreement).

For purposes of the Plan and any option granted hereunder, "employment" shall
be defined in accordance with applicable provisions of the regulations issued
pursuant to the Code from time to time. Notwithstanding the foregoing
provisions, no Incentive Stock Option may be exercised after its expiration
date.


                                       5
<PAGE>   6

12.      ADDITIONAL PROVISIONS.

         (a)      Additional Option Provisions. The Board of Directors may, in
its sole discretion, include additional provisions in option agreements
covering options granted under the Plan, including without limitation
restrictions on transfer of, and repurchase rights for the shares issued upon
exercise of the option (whether in an option agreement or in a separate
document to be executed with such agreement or upon exercise of the option),
commitments to pay cash bonuses, to make, arrange for or guaranty loans or to
transfer other property to optionees upon exercise of options, or such other
provisions as shall be determined by the Board of Directors; provided that such
additional provisions shall not be inconsistent with any other term or
condition of the Plan and such additional provisions shall not cause any
Incentive Stock Option granted under the Plan to fail to qualify as an
Incentive Stock Option within the meaning of Section 422 of the Code.

         (b)      Acceleration, Extension, Etc. The Board of Directors may, in
its sole discretion, (i) accelerate the date or dates on which all or any
particular option or options granted under the Plan may be exercised or (ii)
extend the dates during which all, or any particular, option or options granted
under the Plan may be exercised.

13.      GENERAL RESTRICTIONS.

         (a)      Conditions to Exercise of Options. The Board of Directors may,
in its discretion, require as conditions to the grant or exercise of options
and the issuance of shares thereunder either (a) that a registration statement
under the Securities Act of 1933, as amended (the "Securities Act"), with
respect to the options and the shares to be issued on the exercise thereof
shall have become, and continue to be, effective, or (b) that the participant
(i) shall have represented, warranted and agreed, in form and substance
satisfactory to the Company, that he or she is acquiring the shares for his or
her own account, for investment and not with a view to or in connection with
any distribution, (ii) has had such opportunity as he or she has deemed
adequate to obtain such information as is necessary to evaluate the merits and
risks of an investment in the Company, and is able to bear the economic risk of
holding shares for an indefinite period; (iii) shall have made such
representations, warranties and covenants as the Company shall deem desirable
with respect to the shares' status under Rule 144 of the Securities Act and the
public sale of such shares following the filing of a registration statement by
the Company; (iv) shall have agreed to restrictions on transfer in form and
substance satisfactory to the Company; and (v) shall have agreed to an
endorsement which makes reference to such representations, warranties,
agreements and restrictions on the certificate(s) representing the shares. In
addition, all shares issued to participants upon exercise of options shall be
subject to any and all restrictions on transfer, including without limitation
rights of first refusal, imposed by applicable state or federal securities laws
or by the Articles of Organization or the By-Laws of the Company as then in
effect.

         (b)      Compliance With Securities Laws. Each option shall be subject
to the requirement that if, at any time, counsel to the Company shall determine
that the listing, registration or qualification of the shares subject to such
option upon any securities exchange or under any state or federal law, or the
consent or approval of any governmental or regulatory


                                       6
<PAGE>   7

body, or that the disclosure of non-public information or the satisfaction of
any other condition is necessary as a condition of, or in connection with, the
issuance or purchase of shares thereunder, such option may not be exercised, in
whole or in part, unless such listing, registration, qualification, consent or
approval, or satisfaction of such condition shall have been effected or
obtained on conditions acceptable to the Board of Directors. Nothing herein
shall be deemed to require the Company to apply for or to obtain such listing,
registration or qualification, or to satisfy such condition.

14.      RIGHTS AS A SHAREHOLDER.

         The holder of an option shall have no rights as a shareholder with
respect to any shares covered by the option (including, without limitation, any
rights to receive dividends or non-cash distributions with respect to such
shares) until the date of issue of a stock certificate to him or her for such
shares. No adjustment shall be made for dividends or other rights for which the
record date is prior to the date such stock certificate is issued.

15.      ADJUSTMENT PROVISIONS FOR RECAPITALIZATIONS AND RELATED TRANSACTIONS.

         (a)      General. If, through or as a result of any merger,
consolidation, sale of all or substantially all of the assets of the Company,
reorganization, recapitalization, reclassification, stock dividend, stock
split, reverse stock split or other similar transaction, (i) the outstanding
shares of Common Stock are increased, decreased or exchanged for a different
number or kind of shares or other securities of the Company, or (ii) additional
shares or new or different shares or other securities of the Company or other
non-cash assets are distributed with respect to such shares of Common Stock or
other securities, an appropriate and proportionate adjustment may be made in
(x) the maximum number and kind of shares reserved for issuance under the Plan,
(y) the number and kind of shares or other securities subject to any then
outstanding options under the Plan, and (z) the price for each share subject to
any then outstanding options under the Plan, without changing the aggregate
purchase price as to which such options remain exercisable. Notwithstanding the
foregoing, no adjustment shall be made pursuant to this Section 15 if such
adjustment would cause the Plan to fail to comply with Section 422 of the Code.

         (b)      Board Authority to Make Adjustments. Any adjustments under
this Section 15 will be made by the Board of Directors, whose determination as
to what adjustments, if any, will be made and the extent thereof will be final,
binding and conclusive. No fractional shares will be issued under the Plan on
account of any such adjustments.

16.      MERGER, CONSOLIDATION, ASSET SALE, LIQUIDATION, ETC.

         (a)      General. In the event of a consolidation or merger or sale of
all or substantially all of the assets of the Company in which outstanding
shares of Common Stock are exchanged for securities, cash or other property of
any other corporation or business entity, or in the event of a liquidation of
the Company, the Board of Directors of the Company, or the board of directors
of any corporation assuming the obligations of the Company, may, in its
discretion, take any one or more of the following actions, as to outstanding
options: (i) provide that such options shall be


                                       7
<PAGE>   8

assumed, or equivalent options shall be substituted, by the acquiring or
succeeding corporation (or an affiliate thereof), provided that any such
options substituted for Incentive Stock Options shall meet the requirements of
Section 424(a) of the Code, (ii) upon written notice to the optionees, provide
that all unexercised options will terminate immediately prior to the
consummation of such transaction unless exercised by the optionee within a
specified period following the date of such notice, provided that in such
event, the vesting date for all then-unvested options will be accelerated to
such termination date, (iii) in the event of a merger under the terms of which
holders of the Common Stock of the Company will receive upon consummation
thereof a cash payment for each share surrendered in the merger (the "Merger
Price"), make or provide for a cash payment to the optionees equal to the
difference between (A) the Merger Price times the number of shares of Common
Stock subject to such outstanding options (to the extent then exercisable at
prices not in excess of the Merger Price) and (B) the aggregate exercise price
of all such outstanding options in exchange for the termination of such
options, and (iv) provide that all or any outstanding options shall become
exercisable in full immediately prior to such event.

         (b)      Substitute Options. The Company may grant options under the
Plan in substitution for options held by employees of another corporation who
become employees of the Company, or a subsidiary of the Company, as the result
of a merger or consolidation of the employing corporation with the Company or a
subsidiary of the Company, or as a result of the acquisition by the Company, or
one of its subsidiaries, of property or stock of the employing corporation. The
Company may direct that substitute options be granted on such terms and
conditions as the Board of Directors considers appropriate in the
circumstances.

17.      NO EMPLOYMENT RIGHTS.

         Nothing contained in the Plan or in any option shall confer upon any
optionee any right with respect to the continuation of his or her employment by
the Company or interfere in any way with the right of the Company at any time
to terminate such employment or to increase or decrease the compensation of the
optionee.

18.      OTHER EMPLOYEE BENEFITS.

         Except as to plans which by their terms include such amounts as
compensation, the amount of any compensation deemed to be received by an
employee as a result of the exercise of an option or the sale of shares
received upon such exercise will not constitute compensation with respect to
which any other employee benefits of such employee are determined, including,
without limitation, benefits under any bonus, pension, profit-sharing, life
insurance or salary continuation plan, except as otherwise specifically
determined by the Board of Directors.

19.      AMENDMENT OF THE PLAN.

         (a)      The Board of Directors may at any time, and from time to time,
modify or amend the Plan in any respect, except that if at any time the
approval of the shareholders of the Company is required under Section 422 of
the Code or any successor provision with respect to


                                       8
<PAGE>   9

Incentive Stock Options, or under Rule 16b-3, the Board of Directors may not
effect such modification or amendment without such approval.

         (b)      The termination or any modification or amendment of the Plan
shall not, without the consent of an optionee, affect his or her rights under
an option previously granted to him or her. With the consent of the optionee
affected, the Board of Directors may amend outstanding option agreements in a
manner not inconsistent with the Plan. The Board of Directors shall have the
right to amend or modify (i) the terms and provisions of the Plan and of any
outstanding Incentive Stock Options granted under the Plan to the extent
necessary to qualify any or all such options for such favorable federal income
tax treatment (including deferral of taxation upon exercise) as may be afforded
incentive stock options under Section 422 of the Code and (ii) the terms and
provisions of the Plan and of any outstanding option to the extent necessary to
ensure the qualification of the Plan under Rule 16b-3.

20.      WITHHOLDING.

         (a)      The Company shall have the right to deduct from payments of
any kind otherwise due to the optionee any federal, state or local taxes of any
kind required by law to be withheld with respect to any shares issued upon
exercise of options under the Plan. Subject to the prior approval of the
Company, which may be withheld by the Company in its sole discretion, the
optionee may elect to satisfy such obligations, in whole or in part, (i) by
causing the Company to withhold shares of Common Stock otherwise issuable
pursuant to the exercise of an option or (ii) by delivering to the Company
shares of Common Stock already owned by the optionee. The shares so delivered
or withheld shall have a fair market value equal to such withholding
obligation. The fair market value of the shares used to satisfy such
withholding obligation shall be determined by the Company as of the date that
the amount of tax to be withheld is to be determined. An optionee who has made
an election pursuant to this Section 20(a) may only satisfy his or her
withholding obligation with shares of Common Stock which are not subject to any
repurchase, forfeiture, unfulfilled vesting or other similar requirements.

         (b)      Notwithstanding the foregoing, in the case of a Reporting
Person, no election to use shares for the payment of withholding taxes shall be
effective unless made in compliance with any applicable requirements of Rule
16b-3 (unless it is intended that the transaction not qualify for exemption
under Rule 16b-3).

21.      CANCELLATION AND NEW GRANT OF OPTIONS, ETC.

         The Board of Directors shall have the authority to effect, at any time
and from time to time, with the consent of the affected optionees, (i) the
cancellation of any or all outstanding options under the Plan and the grant in
substitution therefor of new options under the Plan covering the same or
different numbers of shares of Common Stock and having an option exercise price
per share which may be lower or higher than the exercise price per share of the
canceled options, or (ii) the amendment of the terms of any and all outstanding
options under the Plan to provide an option exercise price per share which is
higher or lower than the then-current exercise price per share of such
outstanding options.


                                       9
<PAGE>   10

22.      EFFECTIVE DATE AND DURATION OF THE PLAN.

         (a)      Effective Date. The Plan shall become effective when adopted
by the Board of Directors, but no option granted under the Plan shall become
exercisable unless and until the Plan shall have been approved by the Company's
shareholders. If such shareholder approval is not obtained within twelve months
after the date of the Board's adoption of the Plan, options previously granted
under the Plan shall not vest and shall terminate and no options shall be
granted thereafter. Amendments to the Plan not requiring shareholder approval
shall become effective when adopted by the Board of Directors; amendments
requiring shareholder approval (as provided in Section 19) shall become
effective when adopted by the Board of Directors, but no option granted after
the date of such amendment shall become exercisable (to the extent that such
amendment to the Plan was required to enable the Company to grant such option
to a particular person) unless and until such amendment shall have been
approved by the Company's shareholders. If such shareholder approval is not
obtained within twelve months of the Board's adoption of such amendment, any
options granted on or after the date of such amendment shall terminate to the
extent that such amendment was required to enable the Company to grant such
option to a particular optionee. Subject to this limitation, options may be
granted under the Plan at any time after the effective date and before the date
fixed for termination of the Plan.

         (b)      Termination. Unless sooner terminated in accordance with
Section 16, the Plan shall terminate upon the close of business on the day next
preceding the tenth anniversary of the date of its adoption by the Board of
Directors. Options outstanding on such date shall continue to have force and
effect in accordance with the provisions of the instruments evidencing such
options.

23.      PROVISION FOR FOREIGN PARTICIPANTS.

         The Board of Directors may, without amending the Plan, modify awards
or options granted to participants who are foreign nationals or employed
outside the United States to recognize differences in laws, rules, regulations
or customs of such foreign jurisdictions with respect to tax, securities,
currency, employee benefit or other matters.


                                      10