Document:

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                                                                    Exhibit 10.6

                          Lease Termination Agreement

     This Agreement (the "Lease Termination Agreement") is made this 3/rd/ day
of March, 2000 by and between OMV Associates Limited Partnership, a
Massachusetts Limited Partnership as successor to MBL Life Assurance Corporation
(the "Landlord") and Inso Corporation, a Delaware corporation, formerly known as
Infosoft International, Inc. (the "Tenant").

     WHEREAS, by a Lease dated November 30, 1994 (the "Lease"), Landlord leased
to Tenant certain space (the "Premises") consisting of 42,500 square feet of
space on the eleventh (11th) floor of the building (the "Building") located at
31 St. James Avenue, Boston, MA 02116; and

     WHEREAS, by an Amendment to Office Lease (the "First Amendment to Lease")
dated August 26, 1996 the size of the Premises was increased by adding 4,833
square feet of space on the third (3rd) floor of the building (the "3rd Floor
Expansion Area"), which space Tenant later gave back to Landlord; and

     WHEREAS, by a Second Amendment to Office Lease (the "Second Amendment to
Lease") dated January 8, 1997 the size of the Premises was further increased by
adding 42,500 square feet on the sixth (6th) floor of the Building (the "6th
Floor Expansion Area" or the "Terminated Premises"); and

     WHEREAS, by a Third Amendment to Office Lease (the "Third Amendment to
Lease") dated January 26, 1999 the size of the Premises was adjusted by Tenant
surrendering to Landlord 42,500 square feet on the sixth (6th) floor of the
Building (the "6th Floor Expansion Area" or the "Terminated Premises") and by
adding 5,235 square feet of space on the third (3/rd/) floor of the Building
(the "Third Floor Premises"); and

     WHEREAS, Tenant and Landlord desire to terminate the Lease, as amended,
prior to the scheduled termination date (the "Early Termination") and to enter
into a new lease (the "New Lease") of premises on the third floor (the "New
Premises").

     NOW THEREFORE, in consideration of the foregoing and for other good and
valuable consideration, the receipt and sufficiency of which are hereby mutually
acknowledged, Landlord and Tenant hereby confirm and agree as follows:

     1.   Defined Terms. All capitalized items not defined in this Agreement
          --------------
shall have the meaning ascribed to them in the Lease as amended by the First
Amendment, the Second Amendment, and the Third Amendment (the First Amendment,
the Second Amendment, and the Third Amendment are sometimes referred to
collectively herein as the "Amendments"). The Premises, as amended by the
Amendments, are hereinafter referred to as the "Existing Premises."

     2.   Early Termination. Subject to the terms and conditions set forth
          ------------------
below, Tenant shall deliver to Landlord the Premises. In consideration for such
delivery, Landlord shall, subject to the terms and conditions set forth below,
terminate all of Tenant's obligations under the Lease.

     3.   Effect of Early Termination.
          ----------------------------

          (a)  Effective as of three days after Landlord delivers the New
Premises to Tenant in accordance with the terms and conditions of the New Lease
(the "Termination Date"), Tenant shall be released from any and all duties and
obligations under the Lease, except for those duties and obligations detailed in
this Section 3a. As consideration for Tenant's agreement to vacate the Premises
as of the Termination Date, Landlord remises, releases and forever discharges
Tenant from all debts, demand,
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actions, causes of action, contracts, controversies, agreements, promises,
damages, executions and liabilities and any and all other claims of every kind,
nature and description whatsoever, both in Law and in Equity, which against said
Tenant, or its officers, directors, shareholders, administrators, successors,
agents, employees, beneficiaries, attorneys or assigns, said Landlord now has,
may have or ever had which arise under the Lease of such Premises on or after
the Termination Date.

          (b)  As consideration for Landlord's agreement to terminate the Lease
as of the Termination Date, Tenant hereby remises, releases and forever
discharges Landlord from all debts, demands, actions, causes of action,
contracts, controversies, agreements, promises, damages, executions and
liabilities and any and all other claims of every kind, nature and description
whatsoever, both in Law and Equity, which against said Tenant, or its officers,
directors, shareholders, administrators, successors, agents, employees,
beneficiaries, attorneys or assigns, said Landlord now has, may have or ever had
which arise under the Lease on or after the Termination Date.

     4.   Delivery of Premises. Tenant shall deliver the Premises set forth in
          ---------------------
broom-clean, "as is" condition, except that Tenant shall remove all trade
fixtures, equipment and other personal property (the "Removable Property"), but
shall not remove any existing improvements, alterations or additions. Tenant's
Removable Property shall be deemed abandoned if not removed by the Termination
Date.

     5.   Representations and Warranties.
          -------------------------------

          (a)  Each party hereby represents and warrants to the other, as
applicable, (i) the execution, delivery and performance of this Agreement have
been duly authorized (ii) no consent or approval of any third party or parties
is required in order for either party to execute, deliver and perform this
Agreement, (iii) there are no outstanding contracts, agreements, orders for
judgment binding upon Landlord or Tenant that would or could be violated by the
execution, delivery or performance of this Agreement.

          (b)  Each individual executing this Agreement represents and warrants
that he or she has all necessary power and authority to do so and that, upon
execution hereof and satisfaction of all other requirements and contingencies
set forth herein, the party on whose behalf such individual is acting shall be
bound hereby.

     6.   Miscellaneous.
          --------------

          (a)  Landlord acknowledges that, as of the date hereof, it has no
knowledge of a default of Tenant under the terms of the Lease, as amended, and
that there exists no event or circumstance which, with the passage of time or
the giving of notice or both, would constitute such a default, and Landlord is
not aware of any claim and any nature against the Tenant arising out of the
Tenant's occupancy of the Premises. Tenant acknowledges that, as of the date
hereof, it has no knowledge of a default of Landlord under the terms of the
Lease, as amended, and to Tenant's knowledge, there exists no event or
circumstance which, with the passage of time or giving of notice or both, would
constitute such a default and Tenant is not aware of any claim of any nature
against Landlord arising out of Tenant's occupancy of the Premises.

          (b)  All references herein to the Lease shall be deemed to be
references to the Lease as amended in the Amendments.

          (c)  This Agreement shall be binding upon and inure to the benefit of
the parties and their successors and assigns.
<PAGE>
                                                                    Exhibit 10.6

          (d)  Each party agrees to cooperate with the other and to execute and
deliver all such further instruments and documents and do all such further acts
and things as such party may be reasonably requested to do from time to time by
the other party in order to carry out the provisions and objectives of this
Agreement.

          (e)  This Agreement may be signed in counterparts, all of which when
taken together shall constitute one agreement.

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

<TABLE>
<S>                                                    <C>
Tenant: Inso Corporation, formerly                     Landlord: OMV Associates Limited Partnership
        known as Infosoft International, Inc.                BY: Park Square Corporation - its General Partner
                                                             BY: Richard D. Cohen - its President

            /s/ Jonathan Levitt
--------------------------------------------

                Jonathan Levitt                        /s/ Richard Cohen
--------------------------------------------           ----------------------------------
                Vice President
</TABLE>

Hereunto Duly Authorized<PAGE>

                                                                    Exhibit 10.7

                         INFOSOFT INTERNATIONAL, INC.
                           1993 Stock Purchase Plan

          The purpose of this Plan is to provide eligible employees of InfoSoft
International, Inc. (the "Company") with opportunities to purchase shares of the
Company's common stock, $0.01 par value (the "Common Stock"). One hundred
thousand (100,000) shares of Common Stock in the aggregate have been approved
for this purpose.

          1.   Administration. The Plan shall be administered by the Company's
Board of Directors or by a Committee appointed by the Board of Directors (the
"Committee"). The Board of Directors or the Committee has authority to make
rules and regulations for the administration of the Plan, and its
interpretations and decisions with regard thereto shall be final and conclusive.

          2.   Eligibility. All employees of the Company, including Directors
who are employees, are eligible to participate in any one or more of the
offerings of Options (as defined in Section 9) to purchase Common Stock under
the Plan provided that:

     (a)  they are regularly employed by the Company or a subsidiary of the
Company designated by the Committee (a "Designated Subsidiary") more than 20
hours a week for at least five months per calendar year; and

     (b)  they are employees of the Company or a Designated Subsidiary on the
first day of the applicable Plan Period (as defined below).

               Participation in the Plan will be neither permitted nor denied
contrary to the requirements of the Internal Revenue Code of 1986, as
amended(the "Code"). No employee may purchase shares pursuant to the Plan if
such employee, immediately after such purchase, owns 5% or more of the total
combined voting power or value of the stock of the Company.

               3.   Offerings. The Company will make one or more
offerings("Offerings") to employees to purchase Common Stock under this Plan.
The initial Offering will begin on the effective date of the Company's initial
public offering and end on the following June 30 (the "Initial Offering"). All
subsequent Offerings shall begin on each January 1 or July 1, or the first
business day thereafter. The first day of each Offering shall be known as the
"Offering Date". Except for the Initial Offering, each Offering Date will begin
a six-month period (a "Plan Period").

               4.   Participation. An employee eligible on the Offering Date of
any Offering may participate in such Offering by completing and forwarding an
enrollment form to the employee's appropriate payroll location. The form will
(a) state the amount to be deducted from his Compensation per pay
period, (b) authorize the purchase of Common Stock for him in each Offering in
accordance with the terms of the Plan and

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(c) specify the exact name or names in which shares of Common Stock purchased
for him are to be issued pursuant to Section 10 hereof. Unless an employee files
a new form or withdraws from the Plan, his deductions and purchases will
continue at the same dollar amount for future Offerings under the Plan as long
as the Plan remains in effect.

               5.   Employee Contributions. Each eligible employee may authorize
payroll deductions at a minimum of $6.00 for each weekly pay period or $25.00
for each monthly pay period up to a maximum of 15% of such employee's
Compensation for each such pay period. The Company shall maintain book accounts
showing the amount of payroll deductions made by each eligible employee for each
Plan Period.

               6.   Deduction Changes. An employee may not increase or decrease
his or her payroll deduction during any Plan Period, but may increase or
decrease his or her payroll deduction with respect to the next Plan Period by
filing a new payroll deduction authorization form in advance of the next
Offering Date.

               7.   Interest. No interest will be paid on employee accounts;
however, the Board of Directors or its Committee may, in its sole discretion,
elect to credit employee accounts with interest at such per annum rate as the
Board of Directors or the Committee may from time to time determine.

               8.   Withdrawal of Funds. An employee may at any time prior to
the close of business on the last business day in a Plan Period, and for any
reason, permanently withdraw the entire balance accumulated in the employee's
account and thereby withdraw from participation in an Offering. Partial
withdrawals are not permitted. The employee may not begin participation again
during the remainder of the Plan Period. The employee may participate in any
subsequent Offering in accordance with terms and conditions established by the
Board of Directors or the Committee.

               9.   Purchase of Shares. On each Offering Date of a Plan Period,
the Company will grant to each eligible employee who is then a participant in
the Plan an option ("Option") to purchase on the last business day of such Plan
Period (the "Exercise Date"), at the Option Price hereinafter provided for, such
number of whole shares of Common Stock of the Company reserved for the purposes
of the Plan as does not exceed the number of shares equal in value to 15% of
such employee's projected Compensation for the Plan Period divided by, with
respect to the Initial Offering, 85% of the offering price to the public of the
Common Stock on the date of the initial public offering of the Common Stock, or,
with respect to each Offering other than the Initial Offering, 85% of the last
reported sale price of the Common Stock on the Nasdaq National Market (the
"National Market") on the Offering Date.

               With respect to the Initial Offering, the purchase price for each
share purchased under the Plan will be 85% of the offering price to the public
of the Common Stock on the date of the initial public offering of the Common
Stock, or 85% of the last reported sale price of the Common Stock on the
National Market on the Exercise

                                       2
<PAGE>

Date, whichever price shall be less, rounded up to avoid fractions other than
1/4, 1/2 and 3/4. With respect to each Offering other than the Initial Offering,
the purchase price for each share purchased under the Plan will be 85% of the
last reported sale price of the Common Stock on the National Market on the
Offering Date or the Exercise Date, whichever last reported sale price shall be
less, rounded up to avoid fractions other than 1/4, 1/2 and 3/4. The purchase
price determined by reference to either of the two preceding sentences shall be
referred to herein as the "Option Price".

               No employee may be granted an Option permitting rights to
purchase Common Stock under this Plan and rights under any other stock purchase
plan of the Company to accrue at a rate which in the aggregate exceeds $25,000
of the fair market value of such Common Stock (determined at the Offering Date
of the Plan Period) for each calendar year in which the Option is outstanding at
any time. The purpose of the limitation in the preceding sentence is to comply
with Section 423(b)(8) of the Code.

               Each employee who continues to be a participant in the Plan on
the Exercise Date shall be deemed to have exercised such employee's Option at
the Option Price on such date and shall be deemed to have purchased from the
Company such number of full shares of Common Stock reserved for purposes of the
Plan as such employee's accumulated payroll deductions on such date will pay for
pursuant to the formula set forth above. Any balance remaining in an employee's
account at the end of a Plan Period will be refunded to the employee promptly.

               10.  Issuance of Certificates. Certificates representing shares
of Common Stock purchased under the Plan may be issued only in the name of the
employee, or in the name of the employee and another person of legal age as
joint tenants with rights of survivorship.

               11.  Definitions. The phrase "last reported sale price" means the
last reported sale price of the Common Stock on the Exchange on a given day or,
if no sales of Common Stock were made on that day, the last reported sale price
of the Common Stock on the next preceding day on which sales were made.

               The term "Compensation" means the amount of base pay reportable
on the employee's Federal Income Tax Withholding Statement, excluding overtime,
incentive or bonus awards, allowances and reimbursements for expenses such as
relocation expenses or travel expenses, income or gains on the exercise of
Company stock options, and similar items, whether or not shown on the employee's
Federal Income Tax Withholding Statement.

               12.  Rights on Retirement Death, or Termination of Employment. In
the event of a participating employee's termination of employment prior to the
last business day of a Plan Period, no payroll deduction shall be taken from any
pay due and owing to the employee and the balance in the employee's account
shall be paid to the employee or, in the event of the employee's death, to the
employ1ee's designated beneficiary. If, prior to the last business day of the
Plan Period, the Subsidiary by which an employee is employed shall cease to be a
Designated Subsidiary of the Company, or if the employee is

                                       3
<PAGE>

transferred to a Subsidiary of the Company that is not a Designated Subsidiary,
it shall be deemed that the employee has terminated employment for the purposes
of this Plan.

               13.  Optionees not Stockholders. Neither the granting of an
Option to an employee nor the deductions from an employee's pay shall constitute
such employee a stockholder of the shares of Common Stock covered by an Option
under this Plan until such shares have been purchased by and issued to such
employee.

               14.  Rights Not Transferable. Rights under this Plan are not
transferable by a participating employee other than by will or the laws of
descent and distribution, and are exercisable during the employee's lifetime
only by the employee.

               15.  Application of Funds. All funds received or held by the
Company under this Plan may be combined with other corporate funds and may be
used for any corporate purpose.

               16.  Adjustment in Case of Changes Affecting Common Stock. In the
event of a subdivision of outstanding shares of Common Stock, or the payment of
a dividend in Common Stock, the number of shares approved for this Plan, and the
share limitation set forth in Section 9, shall be increased proportionately, and
such other adjustment shall be made as may be deemed equitable by the Board of
Directors or the Committee. In the event of any other change affecting the
Common Stock, such adjustment shall be made as may be deemed equitable by the
Board of Directors or the Committee to give proper effect to such event.

               17.  Amendment of the Plan. The Board of Directors may at any
time and from time to time, amend this Plan in any respect, except that without
approval by a majority of the votes cast at a duly held stockholders' meeting at
which a quorum representing a majority of all outstanding Common Stock is,
either in person or by proxy, present, no amendment shall be made (a) increasing
or decreasing the number of shares approved for this Plan or (b) changing the
class of employees eligible to receive Options under the Plan.

               18.  Merger, Reorganization, etc. In the event of a merger,
reorganization, consolidation, or liquidation involving the Company, the
Committee has discretion to provide that all outstanding obligations of the
Company under the Plan will be assumed or equivalent rights substituted by the
successor corporation, or the Committee may shorten the offering period and
provide for all sums collected to be applied to purchase stock immediately prior
to such merger or other transaction.

               19.  Insufficient Shares. In the event that the total number of
shares of Common Stock specified in elections to be purchased under any Offering
plus the number of shares purchased under previous Offerings under this Plan
exceeds the maximum number of shares issuable under this Plan, the Board of
Directors or the Committee shall allot, in such manner as it may determine, the
shares then available.

               20.  Termination of the Plan. This Plan may be terminated at any
time by the Company's Board of Directors, subject to the

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<PAGE>

limitation that no such action may adversely affect any outstanding rights to
purchase Common Stock.

               21.  Governmental Regulations. The Company's obligation to sell
and deliver Common Stock under this Plan is subject to listing on the National
Market and obtaining all governmental approvals required in connection with the
authorization, issuance, or sale of such stock.

               The Plan shall be governed by Delaware law except to the extent
that such law is preempted by federal law.

               The Plan is intended to comply with the provisions of Rule 16b-3
promulgated under the Securities Exchange Act of 1934, as amended. Any provision
inconsistent with such Rule shall be inoperative and shall not affect the
validity of the Plan.

               22.  Issuance of Shares. Shares may be issued upon exercise of an
Option from authorized but unissued Common Stock, from shares held in the
treasury of the Company, or from any other proper source.

               23.  Notification upon Sale of Shares. Each employee agrees, by
entering the Plan, to give the Company prompt notice of any disposition of
shares purchased under the Plan where such disposition occurs within two years
after the date of grant of the Option pursuant to which such shares were
purchased.

               24.  Effective Date and Approval of Shareholders. The Plan shall
take effect on the first day of the Company's initial public offering (the
"Effective Date") subject to closing of the offering and approval by a majority
of the votes cast at a duly held shareholders' meeting at which a quorum
representing a majority of all outstanding Common Stock is, either in person or
by proxy, present, which approval must occur within twelve months of the
adoption of the Plan by the Board of Directors.

                                       5
<PAGE>

                                AMENDMENT NO. 1
                                      TO
                           1993 STOCK PURCHASE PLAN
                                      OF
                               INSO CORPORATION

          The 1993 Stock Purchase Plan (the "Plan") of Inso Corporation,
formerly known as InfoSoft International, Inc. is hereby amended as follows
(capitalized terms used herein and not defined herein shall have the respective
meaning ascribed to such terms in the Plan):

          The first paragraph of the Plan shall be deleted in its entirety and
replaced with the following:

          "The purpose of this Plan is to provide eligible employees of Inso
Corporation (the "Company") with opportunities to purchase shares of the
Company's common stock, $0.01 par value (the "Common Stock").

Four hundred and fifty thousand (450,000) shares of Common Stock in the
aggregate have been approved for this purpose."

The third sentence of Section 3 of the Plan shall be deleted in its entirety and
replaced with the following:

          "Offerings on or before January 1, 1999 shall begin on each January 1
or July 1, or the first business day thereafter, subsequent offerings shall
begin on each June 1 or December 1, or the first business day thereafter."

          Except as aforesaid, the Plan shall remain in full force and effect.

                                            Adopted by the
                                            Board of Directors

                                            March 9, 1998

                                       6
<PAGE>

                                AMENDMENT NO. 2
                                      TO
                           1993 STOCK PURCHASE PLAN
                                      OF
                               INSO CORPORATION

          The 1993 Stock Purchase Plan (the "Plan") of Inso Corporation,
formerly known as InfoSoft International, Inc. is hereby amended as follows
(capitalized terms used herein and not defined herein shall have the respective
meaning ascribed to such terms in the Plan):

          The first paragraph of the Plan shall be deleted in its entirety and
replaced with the following:

          "The purpose of this Plan is to provide eligible employees of Inso
Corporation (the "Company") with opportunities to purchase shares of the
Company's common stock, $0.01 par value (the "Common Stock"). Seven hundred
thousand (700,000) shares of Common Stock in the aggregate have been approved
for this purpose."

          Except as aforesaid, the Plan shall remain in full force and effect.

                                             Adopted by the
                                             Board of Directors

                                             April 7, 2000

                                       7

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