Document:

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                                                                    EXHIBIT 10.9

                                                          Agreement No._________
                                                          ----------------------
---------------
 Revenue Stamp

 (Yen)4000
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     Note:  Portions of this Exhibit have been omitted pursuant to a request for
confidential treatment filed with the SEC under Rule 406. The omitted
confidential material has been confidentially submitted separately with the SEC.

            Basic Agreement on Continual Sale and Purchase of Goods

                                 (Translation)

     October 1, 1999

                                                  Seller:

                                                  Trend Micro Incorporated

                                                  Odakyu Southern Tower 10F
                                                  2-2-1 Yoyogi
                                                  Shibuya-ku, Tokyo

                                                  Representative Director

                                                  Chang Ming Jang

                                                  Buyer:

                                                  SOFTBANK COMMERCE CORP.

                                                  24-1 Nihonbashi-Hakozaki-cho
                                                  Chuo-ku, Tokyo

                                                  Representative Director

                                                  Ken Miyauchi
<PAGE>

     This Agreement is entered by and between Trend Micro Incorporated (the
"Seller") and SOFTBANK COMMERCE CORP. (the "Buyer" or, collectively with the
Seller, the "Parties"), concerning continual sale and purchase of goods between
the Parties.

1.   Scope of the Agreement

     1.1  Any matter provided herein shall be equally applicable to any and all
          Sale and Purchase Agreements to be executed between the Parties during
          the term of this Agreement pursuant to Article 5 hereof ("Individual
          Agreement").

     1.2  Upon execution of the Agreement, any previous agreements entered
          between the Parties concerning the Buyer's placement of orders for
          goods with the Seller ("Old Agreements"), such as "Basic Agreement on
          Continual Purchase and Sale of Goods", shall lose effect in their
          entirety.

     1.3  This Agreement shall apply to the rights and obligations relating to
          the Individual Agreement that have arisen between the Parties under
          the Old Agreement.

     1.4  Any reference made to the Old Agreement in any memorandum executed
          between the Parties pursuant to the Old Agreement shall mean reference
          to this Agreement.

2.   Definitions

     As used in this Agreement, unless otherwise provided, the following terms
shall have the following meanings:

     (1)  "Goods" means any software for personal computers ("PCs"), PCs,
          peripheral equipment for PCs or similar Goods, and supplies relating
          thereto, that are or will be manufactured or sold within the Territory
          by the Seller. Provided, however, that Goods shall include items,
          other than those mentioned above, as may be determined by the Parties
          in writing.

     (2)  "Territory" means Japan and other areas as may be determined by the
          Parties in writing.

3.   Purpose

     The Seller shall continually sell Goods to the Buyer under the terms and
conditions set forth herein, and the Buyer shall purchase and sell such Goods
within the Territory.
<PAGE>

4.   Sale Price

     4.1  The Seller shall sell Goods to the Buyer at the price set forth in a
          separate Memorandum to be entered into between the Parties.

     4.2  The Buyer shall determine the Good's selling prices to its customers.
          (including, but not limited to, Buyer's affiliated companies, and the
          resellers or end users the Buyer conducts business with.)

5.   Individual Contracts

     5.1  The name, quantity, place and date of delivery of Goods, and other
          terms necessary to effect the sale and purchase between the Parties,
          except those provided herein, shall be set forth in the Individual
          Agreement to be executed between the Parties.

     5.2  The Individual Agreement mentioned in the preceding paragraph shall
          take effect when the Seller expresses to the Buyer of its acceptance
          of the order upon Seller's receipt of the Buyer's order form
          (including orders by fax), or when the Seller fails to express its
          intention either within the same day of its receipt of Buyer's order,
          or by 10:00 a.m. the following day. In either case, the Seller shall
          notify the Buyer of the date of delivery of the Goods specified in the
          Individual Agreement simultaneously with the notification to accept
          the order. Provided, however, to the extent that the Seller has
          already stopped manufacturing the Goods as of the Seller's receipt of
          Buyer's order form, or that any one of the events set forth in Article
          22 herein has occurred to the Seller, the Seller may refuse to execute
          the Individual Agreement. In cases where the Seller deems it difficult
          to accept the order for other reasons, the Seller shall immediately so
          notify the Buyer in writing, and the Parties shall consult with each
          other in good faith to discuss the possibility of changing relevant
          terms of agreement.

6.   Inspection of Delivery

     6.1  The Seller shall deliver the Goods and the statement of delivery,
          prepared in a form specified by the Buyer, to the Buyer by bringing or
          sending the foregoing to the warehouse or other place as specified by
          the Buyer. The Buyer shall promptly inspect the Goods after receiving
          the delivery thereof. Goods are deemed to have been received upon
          passing such inspection. The Seller shall, at its own expense and on
          its own responsibility and within the time period specified by the
          Buyer, take back the Goods which have failed to pass the above
          inspection and the quantity which has exceeded the amount stipulated
          in the Individual Agreement, and if necessary, replace rejected Goods.

     6.2  When the Seller fails to take back the rejected Goods or the quantity
          which has exceeded the amount specified in the Individual Agreement
<PAGE>

          ("Excess Delivery") within the time period set forth in the preceding
          paragraph, the Buyer may send back the foregoing to the Seller at the
          Seller's expense.

     6.3  The Buyer shall keep the rejected Goods or Excess Delivery in its
          custody with the same care as it uses to its own property, and in
          cases where the rejected Goods or Excess Delivery was damaged due to
          causes not attributable to the Buyer, the Seller shall bear such
          damage.

7.   Delayed Delivery

     7.1  When it is deemed impossible to deliver the Goods by the delivery date
          specified in the Individual Agreement due to causes attributable to
          the Seller, the Seller shall promptly inform the Buyer of, including
          causes thereof, in writing and seek instructions from the Buyer.

     7.2  Where it is impossible to deliver the Goods by the date specified in
          the Individual Agreement due to causes attributable to the Seller, the
          Buyer shall have the right to claim damages for delayed delivery at
          the rate of [*]. Notwithstanding the payment of the foregoing damages,
          the Seller shall not be released from the liability set forth in
          Article 23 herein.

     7.3  Where the delivery is delayed for causes not attributable to the
          Buyer, the Buyer may terminate the Individual Agreement with respect
          to such Goods.

8.   Transfer of Title

     8.1  The title of Goods shall be transferred upon completion of the
          inspection set forth in Article 6 herein.

     8.2  Where the Goods are software products, the title to the media of the
          software alone shall transfer as set forth in the preceding paragraph,
          and the right to use the software and other rights shall be directly
          licensed to end users by the licensor ("Original Licensor") pursuant
          to the license or other agreement entered into between the Buyer or
          the Original Licensor.

9.   Risk of Loss

     The Seller shall be liable for any loss, impairment or other damage which
occurred in the Goods prior to completion of inspection, except where causes of
such loss, impairment or other damage are attributable to the Buyer. The Buyer
shall be liable for any loss, impairment or other damage which occurred in the
Goods after completion of inspection, except where causes of such loss,
impairment or other damage are attributable to the Seller.

* Confidential Treatment Requested

<PAGE>

10.  Payment Terms

     10.1  The Buyer shall pay to the Seller the price for the Goods passing the
           inspection, which have been received by the fifteenth day of each
           month (hereinafter the "Amount Due"), by remitting the said amount to
           a bank account designated by the Seller no later than the end of the
           second month following each Closing Date. The remittance fee shall be
           borne by the Seller. Provided, however, the Buyer can setoff the
           payment of the Amount Due against the amount received by the Seller
           for the Goods returned to the Seller by the Buyer ("Amount to be
           Returned"), if there is such Amount to be Returned as of the
           fifteenth day of the said month. In cases where the Amount to be
           returned exceeds the Amount Due, the Seller shall pay the difference
           into the bank account designated by the Buyer no later than the end
           of the second month from thereof.

     10.2  In cases where the fractions of one yen arise in relation to the
           computation of the consumption tax, the said fractions shall be
           discarded.

     10.3  The Seller shall promptly confirm the sum of the Amount paid, and if
           any discrepancies in the sum are found (if there has been a
           miscalculation), the Seller shall promptly contact the Buyer, and the
           Parties shall quickly resolve the matter through discussion. Where no
           protest has been lodged within 6 months of the Seller's receipt of
           the Amount, the Seller shall no longer be able to claim a
           miscalculation.

11.  Promise of Setoff

     If the Seller is under any monetary obligations to the Buyer, the Buyer can
at any time offset such obligations against the Buyer's monetary obligations to
the Seller under this Agreement to the extent of the corresponding amount to his
obligations.

12.  Return of Goods

     Matters relating to return of Goods shall be set forth in the Memorandum to
be executed between the Parties.

13.  Rebates

     Matters relating to rebates on Goods shall be set forth in the Memorandum
to be executed between the Parties.

14.  Warranty of Quality and Function

     14.1  The Seller warrants that the Goods have no defects in their quality
           and function.

     14.2  In cases where the Buyer, its customer, or other third party has
           suffered damage due to defective Goods or where the Buyer has
           received claims or
<PAGE>

           complaints relating to the Goods from its customers, the Seller
           shall, at its own expense and responsibility, resolve the issue by
           replacing such defective Goods, payment of damages or other
           appropriate measures within one year from the receipt of the Goods,
           and hold the Buy harmless, provided, however, that the Seller shall
           keep the Buyer advised of the status of resolution and act under
           instructions, if any, from the Buyer.

     14.3  In the event the Buyer or its customer is forced to pay damages to
           any third party based on the claims or complaints mentioned in 14.2
           above, the Seller shall indemnify such Buyer or its customer, as
           applicable, against any and all damages and costs arising out of or
           incurred in contesting to any claim relating to such disputes.
           (including litigation costs, attorney's fees and other professional
           fees)

     14.4  The Seller shall bear all expenses for shipment, processing of
           returns and such other costs as the Buyer incurs in connection with
           the Buyer's recall or replacement of Goods attributable to a fault in
           the Goods.

     14.5  Even after the lapse of one year from the receipt of Goods, upon
           detection of latent defects arising from the willfulness or gross
           negligence of the Seller, the Seller shall be liable for the
           obligations set forth in 14.2, 14.3 and 14.3 hereof.

15.  Product Liability

     15.1  The Seller warrants that the Goods contain no defects under Article 2
           paragraph 2 of the Product Liability Law. ("Defects")

     15.2  The Buyer shall notify the Seller of any dispute resulting from
           Defects arising between the Buyer or its customer and other third
           party, and the Seller shall, at its own expense, provide cooperation
           and support as necessary for the Buyer or its customer to resolve
           thereof.

     15.3  In the event the Buyer or its customer has been forced to indemnify
           any third party for damages arising out of the Defects of Goods as
           set forth in the preceding paragraph, the Seller shall indemnify such
           Buyer or its customer, as applicable, against any and all damages and
           costs arising out of or incurred in contesting to any claim relating
           to such disputes. (including litigation costs, attorney's fees and
           other professional fees)

     15.4  The Seller shall bear all expenses for shipment, processing of
           returns and such other costs as the Buyer incurs in connection with
           the Buyer's recall or replacement of Goods attributable to a defect
           in the Goods.

16.  Warranty of Copyrights, etc.

     16.1  The Seller warrants that the Goods do not infringe upon industrial
           property rights, (including the rights based on the publication of
<PAGE>

           unexamined applications), copyright, circuit layout right, and other
           intellectual property right of a third party (collectively, the
           "Intellectual Property Rights") in Japan or any other country.

     16.2  In the event any infringement claims of an Intellectual Property
           Right has occurred or is threatened to occur relating to the Goods of
           the Seller, the Seller shall promptly inform the Buyer thereof.

     16.3  In the event any infringement claims of an Intellectual Property
           Right has occurred or is threatened to occur to the Buyer or its
           customer relating to the Goods of the Seller, the Seller shall, at
           its own cost and responsibility, resolve such issues. Furthermore, in
           the event the Buyer or its customer has been forced to indemnify the
           third party for damages arising out of the Defects of Goods, the
           Seller shall indemnify such Buyer or its customer, as applicable,
           against any and all damages and costs arising out of or incurred in
           contesting to any claim relating to such disputes. (including
           litigation costs, attorney's fees and other professional fees).

     16.4  The Seller shall bear all expenses for shipment, processing of
           returns and such other costs as the Buyer incurs in connection with
           the Buyer's recall or replacement of Goods resulting from the fact
           that the Seller's Goods infringed Intellectual Property Right of a
           third party.

17.  Sales Support

     17.1  The Seller shall, at its own expense, prepare and provide products
           for the Buyer for demonstration merchandise, product manuals, and
           catalogues and such other items as necessary for marketing activities
           relating to the Goods.

     17.2  Upon the Buyer's request, the Seller shall, at its own expense,
           provide technical support services necessary for the Buyer's timely
           distribution of the Goods to the Buyer or such other third party as
           may be designated by the Buyer.

     17.3  The Seller shall permit the Buyer and its customers to use the
           trademarks of the Buyer and the Goods only in promotional materials
           such as advertisements, materials, and catalogs prepared by the Buyer
           and its customers relating to sales activities for the Goods.
           Provided, however, upon the Seller's request, the Buyer shall affix
           an appropriate proprietary notice indicating the Seller's rightful
           ownership over such trademarks.

18.  New Products and Upgrades

     18.1  When the Seller plans to sell a new product or an upgrade to the
           Goods sold, the Seller shall promptly notify the Buyer thereof or
           introduce such products to the Buyer in advance.
<PAGE>

     18.2  In the case of the preceding paragraph, unless otherwise agreed upon
           between the Parties, the Buyer may return at any time the entire
           inventory of old Goods held by the Buyer and its customers. The
           expenses incurred by the Buyer in connection with the return of Goods
           including transportation expenses shall be borne by the Seller.

19.  Observance of Statutes, Standards, etc.

     19.1  The Seller's performance of the Agreement and Individual Agreements
           shall be in compliance with applicable laws, rules and standards of
           Japan and other countries. The Seller shall also abide by the Foreign
           Exchange and Foreign Trade Control Law, Export Trade Control Order,
           and order and ministerial ordinances concerning foreign exchange
           control (collectively, the "Foreign Exchange Control Laws"), and
           export trade control laws and regulations of the United States and
           other countries. (collectively, the "U.S. Export Trade Control Law")

     19.2  In cases where the Buyer requests the Seller to submit a report or
           materials in relation to the preceding paragraph, the Seller shall
           promptly comply with this request.

     19.3  The Seller shall have following obligations relating to the U.S.
           Export Trade Control Law:

     (1)   In cases where relevant regulations or conditions exist in the U.S.
           Export Trade Control Law in regard to the Goods for which a quotation
           has been requested by the Seller or on which an Individual Agreement
           is to be executed by the Parties, the Seller shall so indicate in the
           quotation or the written acknowledgement of order, as applicable;

     (2)   When the Buyer specifies the destination country of export (re-
           export) pursuant to (1) above and there is an agreement between the
           Parties that such destination country of export (re-export) is
           included in the Territory pursuant to Article 2(2) herein, the Seller
           shall confirm whether such destination country of export (re-export)
           is a destination of export (re-export) approved under the U.S. Export
           Trade Control Law, and promptly report thereof to the Buyer. If such
           destination country of export (re-export) is not an approved
           destination country and the Buyer requests the Seller to obtain the
           approval of the government organizations of the countries concerned,
           the Seller shall accept such request and promptly obtain such
           approval; and

     (3)   Notwithstanding the above, in the event that it is found after the
           Individual Agreement is executed by the Parties that applicable
           regulations or conditions exist, or that such destination country is
           not an approved destination country of export (re-export), the Seller
           shall promptly notify the Buyer in writing thereof.
<PAGE>

20.  Confidentiality

     20.1 Neither Party shall, without a prior written consent of the other
          party, disclose or leak to a third party any part of this Agreement
          (including Memorandum or Appendixes) or information disclosed by the
          other party in connection with this Agreement. Furthermore, neither
          party shall use such information unless it is necessary in order to
          perform its obligations hereunder or to exercise its rights hereunder.
          Regardless of the foregoing, either Parties may disclose such
          information for justifiable reasons including in compliance with an
          order issued by governmental authorities, provided that the disclosing
          party shall promptly notify the other party thereof prior to such
          disclosure.

     20.2 The provisions set forth in 20.1 above shall not apply to any
          information:

     (1)  that was already in the public domain at the time of disclosure;

     (2)  that becomes publicly known after it is disclosed through no fault of
          the receiving party;

     (3)  that has been rightfully in the possession of the receiving party
          prior to the disclosure;

     (4)  that was legally disclosed by a third party to the receiving party
          free of duty of confidentiality; or

     (5)  that was independently developed by the receiving party without using
          or making reference to the confidential information of the disclosing
          party.

     (6)  that was indicated not to be confidential by the disclosing party.

21.  Term of Agreement

     21.1 This Agreement shall become effective as of the date of execution and,
          unless cancelled or terminated in accordance with the provisions
          herein, remain in force until March 31, 2000.  The term of this
          Agreement shall automatically renew for one year term unless one party
          delivers written notice to the other party no later than one month
          prior to the end of the current term of its intent not to renew this
          Agreement, and the same shall apply thereafter.

     21.2 Without regard to the provisions set forth in the preceding paragraph,
          the Agreement shall become null and void upon its date of expiration
          if no dealings are made between the Parties pursuant to the Agreement
          during the term stipulated in the preceding paragraph.
<PAGE>

22.  Termination Without Cause

     If any of the following events occurs to the Seller, the Buyer may
immediately terminate this Agreement in whole or in part, without issuing a
warning or tender of performance of its obligation. Furthermore, the Buyer may
claim damages against the Seller upon such termination:

     (1)  breach by the Seller of any of the terms set forth herein;

     (2)  suspension of payment of debts or filing of petition for bankruptcy,
          commencement of composition of creditors, corporate reorganization
          proceedings, company arrangement or special liquidation of the Seller;

     (3)  an action by the Clearing House for suspension of the Seller's
          business transactions with financial institutions;

     (4)  issuance of an order or notice of attachment, temporary attachment,
          disposition, public auction of the Sellers property, or sanction
          against the Seller for tax arrearage or other act of public power;

     (5)  a resolution of the Seller for the reduction of capital,
          discontinuance of business, dissolution or change of organization;

     (6)  the Seller's failure to perform any of its obligations to the Buyer;

     (7)  the Seller's material breach of trust; or

     (8)  the Seller's financial condition has become deteriorated or is
          reasonably believed to deteriorate.

23.  Damages

     23.1 Either party shall be liable for any damage suffered by the other
          party due to causes attributable to itself, regardless of whether such
          damages could occur under ordinary circumstances or special
          circumstances, to the extent that such damage was foreseen or
          foreseeable at the time of performance of its obligations hereunder.

     23.2 The damages set forth 23.1 above shall include all expenses incurred
          in seeking the other party's performance of its obligations hereunder,
          as well as reasonable attorney's fees relating to court proceedings
          including litigation.

24.  Effect of Termination

     24.1 Upon termination of this Agreement by cancellation or expiration of
          the term or for any other cause, any of the Individual Agreements
          which are
<PAGE>

          current as of the time of such termination shall also terminate unless
          otherwise agreed between the Parties.

     24.2 Termination of this Agreement, whether by cancellation or expiration
          of the term or for any other cause, shall not accelerate the
          performance of the Buyer's obligation to the Seller.

     24.3 In the event this Agreement is terminated, the Buyer may, at its own
          discretion, dispose such Goods of the Seller as may be held in custody
          of the Buyer pursuant to Article 6 herein and apportion the proceeds
          therefrom less the disposal expenses to the satisfaction of the
          Seller's obligations, if any.

     24.4 In the event that this Agreement is terminated, the Buyer shall be
          entitled to return all the Goods in its inventory to the Seller. The
          same shall apply to the Goods returned to the Buyer by its customers
          within one year from the date of termination or expiration of this
          Agreement.

     24.5 In the event of return of the Goods pursuant to 24.4 above, the Seller
          shall return the price of the Goods already paid by the Buyer, by
          remitting to a bank account specified by the Buyer no later than the
          fifth day of the following month the amount for the Goods returned by
          the end of the month.

     24.6 Notwithstanding the termination of this Agreement by cancellation or
          expiration of the term or for any other cause, the provisions of
          Article 11 (Promise of Setoff), Article 14 (Warranty of Quality and
          Function), Article 15 (Product Liability), Article 16 (Warranty of
          Copyrights, etc.), Article 19 (Observance of Statutes, Standards,
          etc.), Article 20 (Confidentiality), Article 24 (Effect of
          Termination), and Article 27 (Jurisdiction) shall remain in full force
          and effect.

25.  No Assignment

     The Seller shall not assign, or pledge as collateral, any of the rights or
obligations hereunder to any third party without the written consent of the
Buyer.

26.  Notification

     The Seller shall notify the Buyer in writing of any of the following:

     (1)  any change of its bank account for remittance and the name of the
          holder thereof;

     (2)  establishment, relocation or closure of its head office or branch
          office;

     (3)  change of its representative directors; or
<PAGE>

     (4)  material change in its business or likeliness of such material change.

27.  Jurisdiction

     In the event any dispute arises between the Parties relating to the
Agreement or Individual Agreement, the District Court or the Summary Court
having jurisdiction over the area in which the head office of the Buyer is
located shall have exclusive jurisdiction as the court of first instance.

28.  Amendment

     This Agreement may be amended only by a written agreement signed and sealed
by the representative officer of the Parties. If there is any discrepancy
between the provisions of the Agreement and the Individual Agreement, such
provision shall be null and void.

29.  Mutual Consultation

     If any doubts arise in connection with this Agreement, the Parties shall
consult with each other in good faith to resolve such issue.

     IN WITNESS WHEREOF, the parties hereto have caused this instrument to be
executed in duplicate, affixing their names and seals thereto and each party
retaining one copy.
<PAGE>

                                 Confirmation

Trend Micro Incorporated ('Seller') and SOFTBANK COMMERCE CORP. ('Buyer') enter
into this written Confirmation (hereinafter, the 'Confirmation'), pursuant to
the Basic Agreement on Continual Sale and Purchase of Goods (hereinafter, the
'Original Agreement') entered into as of October 1, 1999 between Seller and
Purchaser.

     Article 1.  (Ratio of Retail Price to Purchase Price)

     Unless otherwise agreed in writing by the Parties, the ratio of the Retail
Price to the Purchase Price provided in Article 4.1 of the Basic Agreement shall
be as set forth below.

     The ratio of the Retail Price to the Purchase Price of the Goods of the
Seller shall be determined with respect to each item of the Goods upon mutual
consultation between the Parties.

     Article 2.  Return of the Goods

     Unless otherwise agreed in writing by the Parties, Return of the Goods
provided in Article 12 of the Basic Agreement shall be as set forth below.

     Each party shall, when necessary, consult with each other to agree on
return of the Goods purchased by the Buyer from the Seller. The Buyer may, in
accordance with such agreement, return such Goods as it purchased from the
Seller. No later than the end of the [*] after the month in which such return of
Goods occurred, the Seller shall make a cash payment into the bank account
designated by the Buyer in the amount the Seller has received from the Buyer in
connection the Goods subsequently returned by the Buyer to the Seller by the
fifteenth day of the month thereof. This section does not apply to certain Goods
concerning which return the Basic Agreement states otherwise.

     Article 3.  Rebates

     Unless otherwise agreed in writing by the Parties, rebates on the Goods as
provided in Article 13 of the Basic Agreement shall be as set forth below.

          (1) The Seller shall pay rebates in accordance with the terms provided
in this Article 3 (1) herein.  Rebates shall be [*], less returns. ("Net
Purchase Price")

          (2) The Seller shall pay to the Buyer the rebate calculated in
accordance with Article 3(1) above.  Rebate payments shall be effected, and
shall be deducted from the Buyer's payments to the Seller due in the following
month such rebate is calculated.  Where the amount of rebates exceed the Buyer's
payments to the Seller, the Seller shall pay the difference into the bank
account designated by the Buyer no later than the date specified by the Buyer.

*Confidential Treatment Requested
<PAGE>

     Article 4.  Term

          The Memorandum shall become effective on the date as written below and
remain effective until the termination of the Basic Agreement.

Dated: October 1, 1999

Seller:
Trend Micro Incorporated

10th Floor Odakyu Southern Tower 2 - 2 - 1 Yoyogi, Shibuya-ku, Tokyo

Chang Ming Jang
Representative Director

Buyer
SOFTBANK COMMERCE CORP.

24-1 Nihonbashi-Hakozaki-cho
Chuo-ku, Tokyo

Ken Miyauchi
Representative Director
<PAGE>

                         MEMORANDUM CONCERNING SALES
                                PROMOTIONS FEES

SOFTBANK COMMERCE CORP. ("Softbank") and Trend Micro Kabushiki Kaisha ("Trend
Micro") shall manage Sales Promotion Fees for the year 2000 as follows.

Article 1.  Purpose of Memorandum

     Trend Micro shall pay Softbank the Sales Promotion Fees defined in Article
3 as compensation for business support activities.

Article 2.  Term

     This memorandum shall be valid for 1 year from January 2000.

Article 3.  Stock Target

     The value of the yearly Stock Purchase Target for Trend Micro's products
shall be [*] yen.

     1    The [*] breakdown of the yearly Stock Purchase Target shall be as per
          below:

[*]

     2    Products

     The Products included shall be licenses and packages for InterScan
VirusWall, InterScan eManager, InterScan for MS-Exchange, InterScan for
LotusNotes, Trend VCS, ServerProtect and VirusBuster Corporate Edition.

Article 4.  Method for calculating Sales Promotion Fees.

     Upon attainment of the Stock Purchase Targets defined in Section 3 - 1 [*],
the Sales Promotion Fees shall be calculated per below. However, in the event
the [*] Stock Purchase Target has not been attained, the Stock Purchase Target
shall be reviewed on a [*] basis, and upon attainment of the [*] Stock Purchase
Target, the corresponding Sales Promotion Fees shall be paid.

            1  [*]% attainment: Sales Promotion Fees shall be [*]% of the total
       value of purchase.

            2  [*]% attainment: Sales Promotion Fees shall be [*]% of the total
       value of purchase.

* Confidential Treatment Requested
<PAGE>

Article 5.  Payment

            3  Payment shall be made from the Sales Promotion Fees calculated in
       Article 4 for business support activities described in the attachment to
       be determined by mutual consultation between both parties.

            4  Payment shall be made upon Trend Micro receiving an invoice from
       Softbank.  The payment terms of Trend Micro shall as a rule be by the
       20/th/ day of the [*] after receipt of the invoice.

            5  Payment by Trend Micro shall be made to the payment account
       specified in the Softbank invoice.

Article 6.  Penalties

     In the event that any of the Products included in the calculations made for
the Sales Promotions Fees are returned within a year of sale, Trend Micro shall
deduct the value of the returned Product from the vale of total value of
purchase, and the Sales Promotion Fees shall be recalculated. In the event a
discrepancy arises in the amount payable to Trend Micro, Softbank shall be
requested to repay the difference or change the amount of payment. However,
replacements shall not be considered returned Product for the purposes of this
Memorandum.

Article 7.  Obligations of Softbank

     To facilitate the calculation of costs incurred, Softbank shall be obliged
to submit monthly Product inventories and sales reports, in response to a
monthly request from Trend Micro.

Article 8.  Cancellation and Termination

     1    In the event that any of the following occurs on the part of either
party, the other party may immediately terminate this Memorandum without notice.

i)   When payments have been halted, or when petitioning for bankruptcy, or
     commencement of composition of creditors or procedures for corporate
     rearrangement, corporate reorganization, or special liquidation.

ii)  When a suspension has been effected by a clearing house.

iii) In the event of some other material breach of faith which will preclude the
     Memorandum being continued.

     2    Softbank or Trend Micro may terminate this Memorandum, when the other
party fails to fulfill any of its obligations under this Memorandum, and further
fails to correct the same within a reasonable period after preemptory notice
from the other party

* Confidential Treatment Requested
<PAGE>

Article 9.  Consultation

     In the event there is doubt concerning the interpretation of this
Memorandum, Softbank and Trend Micro shall resolve the same by good-faith mutual
consultation.

IN WITNESS WHEREOF, two originals hereof are created, and upon the names and
seals of each of Softbank and Trend Micro, each shall retain one original
hereof.

Date:

Softbank    Representative:
            Corporate name:
            Address:

Trend Micro Officer in charge:    Shingo Koya, General Manager
                                  Business Partners Department
                                  Sales and Marketing Headquarters
            Corporate name:       Trend Micro Kabushiki Kaisha
            Address:              Odakyu Southern Tower, 10F
                                  2-2-1 Yoyogi, Shibuya-ku, Tokyo-to.
<PAGE>

(Attachment)

Description of Business Support

                                                               February 22, 2000

<TABLE>
<CAPTION>
--------------------------------------------------------------------------------------------------
Preparation of Sales Promotion product       Materials such as catalogues etc. (with joint logo)
--------------------------------------------------------------------------------------------------
<S>                                          <C>
   Acquisition of Certification                                       TCAE/TCSE
--------------------------------------------------------------------------------------------------
           Campaign                                    Directed at Softbank employees and sales
                                                      agents with the purpose of sales promotion
--------------------------------------------------------------------------------------------------
           Seminar                                       Includes introduction to Trend Micro
                                                         products; Purpose - to expand sales
--------------------------------------------------------------------------------------------------
                                       Matters to note

Business support activities other to those described above shall be determined through mutual
                               consultation by both parties
--------------------------------------------------------------------------------------------------
     (attached materials)                                                none
--------------------------------------------------------------------------------------------------
</TABLE>

Trend Micro Kabushiki Kaisha.
<PAGE>

                   MEMORANDUM CONCERNING AGREEMENT TRANSFER

          Trend Micro Incorporated ("Trend Micro") and SOFTBANK E-COMMERCE Corp.
(formerly Softbank Commerce; hereinafter "SOFTBANK E-COMMERCE") hereby agree to
the following concerning the transfer of the agreement to be conducted pursuant
to the transfer of business of Softbank eCommerce scheduled to take place on
April 1, 2000.

Article 1.  Transfer of Agreement

1.   Softbank eCommerce shall, by a resolution of an Extraordinary General
     Meeting of Shareholders convened on December 24, 1999 ("Extraordinary
     General Meeting"), transfer the Soft Network businesses to the Transferee
     designated in the same resolution, SOFTBANK COMMERCE Corp. (to be
     established in March 2000; hereinafter "the Transferee"), and shall
     transfer to the Transferee the status of the parties to, and the rights and
     obligations under any transaction agreements entered into between the two
     parties which have been executed by and are still valid on the Effective
     Date stipulated in Article 3 ("the Agreements").

2.   Trend Micro shall consent to the agreement transfer ("Agreement Transfer")
     described in the preceding paragraph.

Article 2.  Agreement by the Transferee

          Immediately after the Transferee has been duly incorporated, SOFTBANK
E-COMMERCE shall cause the Transferee to furnish Trend Micro and SOFTBANK
E-COMMERCE with documentation stating its consent to, in accordance with the
contents of this Memorandum, accept the Agreements and all rights and
obligations thereunder, and accord SOFTBANK E-COMMERCE with the rights to
receive as settlement agent in accordance with Article 5.

Article 3.  Effective Date

          The Agreement Transfer shall become effective upon the following two
provisions being satisfied (scheduled to be April 1, 2000; hereinafter "the
Effective Date").

1.   The submission of written consent as described in the preceding article
     from the Transferee.

2.   The transfer of the business operations by SOFTBANK E-COMMERCE to the
     Transferee following the necessary license and permission being obtained
     from the relevant authorities pursuant to a resolution of the Extraordinary
     General Meeting.

Article 4.  Effect of Transfer

     The status of the parties to the Agreements, all rights and duties
thereunder (including all mortgages, guarantor rights, rights to claim
compensation and the like) as

<PAGE>

well as obligations arising therefrom shall pass from SOFTBANK E-COMMERCE to the
Transferee in their entirety.

          Provided however, SOFTBANK E-COMMERCE shall remain liable to jointly
and severally perform with the Transferee any of the following obligations with
regard to Trend Micro:

1.   All obligations under Individual Agreements concluded between Trend Micro
     and SOFTBANK E-COMMERCE prior to the Agreement Transfer pursuant to Master
     Agreements included in the Agreements;

2.   Obligations where either of the following had been determined prior to the
     Agreement Transfer.

     i.   Amount of obligation;

     ii.  Type and quantity of goods;

3.   Damages arising from default on the agreements on the part of SOFTBANK
     E-COMMERCE prior to the Agreement Transfer;

4.   Obligations agreed to by both parties separately in writing other to those
     specified in the preceding paragraphs.

Article 5.  Acquisition of Rights to Receive as Settlement Agent

          SOFTBANK E-COMMERCE shall be accorded by the Transferee the rights to
act as agent with regard to receipt of settlements for all claims transferred to
the Transferee from SOFTBANK E-COMMERCE pursuant this Memorandum, and therefore,
after the Effective Date Trend Micro may make settlements with either SOFTBANK
E-COMMERCE or the Transferee.

Article 6.  Mutual Consultation

          If any doubts arise in connection with matters not defined in this
Memorandum, the parties shall resolve such by good faith mutual consultation.
<PAGE>

IN WITNESS WHEREOF, the parties hereto have caused this instrument to be
executed in duplicate, and each party shall retain one copy hereof.

March 31, 2000

                         Trend Micro Incorporated
------------------
 Revenue stamp           Representative Director
 (Yen)200                Chang Ming Jang
------------------

                         Odakyu Southern Tower 10F
                         2-2-1 Yoyogi
                         Shibuya-ku, Tokyo 151-8583 [seal]

                         SOFTBANK E-COMMERCE CORP.
                         Representative Director
                         Ken Miyauchi

                         24-1 Nihonbashi-Hakozaki-cho
                         Chuo-ku, Tokyo [seal]<PAGE>

                                                                   EXHIBIT 10.10

                       STOCK PURCHASE AND SALE AGREEMENT

TREND MICRO INCORPORATED (hereinafter, "Trend Micro"), TOMOO YAMADA
(hereinafter, "Yamada"), and NIHON UNISOFT CORPORATION (hereinafter, "Nihon
Unisoft") hereby execute this agreement as follows (hereinafter, this
"Agreement") concerning the purchase and sale and like matters of Nihon Unisoft
shares held by Yamada to Trend Micro.

Article 1      Purchase and Sale of Shares

1.   Yamada, in accordance with the terms and conditions contained in this
     Agreement, shall sell to Trend Micro the shares of Nihon Unisoft in the
     manner noted hereunder, and Trend Micro shall purchase the same from Yamada
     (hereinafter, the shares set forth below as subject to the purchase and
     sale shall be referred to as the "Shares"). Within 6 business days after
     the date of execution of this Agreement, Yamada shall deliver to Trend
     Micro share certificates which represent the Shares.

               Par-value common stock    266 shares
                                         ---

               Par-value per share       50,000 yen
                                         ------

               Purchase price amount per share  1,000,000 yen
                                                ---------

2.   Trend Micro shall divide the total purchase price of the Shares of
     266,000,000 yen into two installments, and shall make payment thereof by
     -----------
     remitting to a bank account prescribed by Yamada: 1) 75% of the total price
     within 6 business days after receiving the share certificates representing
     the Shares from Yamada, and 2) 25% of the total price within 6 months after
     receiving the share certificate(s) representing the Shares from Yamada.
     Interest at the rate of 5% per annum shall accrue on the purchase price of
     the Shares.

3.   Upon acquisition of the Shares, Trend Micro, as a shareholder of Nihon
     Unisoft, shall demand that Nihon Unisoft pay each of its employees an
     amount equal to one month of their respective pay as a special bonus.

Article 2  Representations and Warranties

1.   Yamada and Nihon Unisoft hereby make the following representations and
     warranties.

     1)   Nihon Unisoft is a legally established and legally operated kabushiki
          gaisha stock company.
<PAGE>

     2)   At the time of the execution of this Agreement, Yamada validly holds
          title and ownership with regard to all the certificates representing
          the Shares, and no lien or security rights shall be established upon
          said certificates as of the time of delivery thereof to Trend Micro.

     3)   The approval of the Board of Directors at Nihon Unisoft and all other
          procedures required under laws, ordinances and the articles of
          incorporation have been legally completed with regard to transfer of
          the Shares pursuant to this Agreement.

     4)   At the time of the execution of this Agreement, the total number of
          common stock shares issued and outstanding of Nihon Unisoft is 2,400
          shares, there are no existing convertible bonds or bonds with new
          share acquisition rights or the like, and further, there does not
          exist any latent or potential shares pursuant to subscription rights
          to new shares or the like.

     5)   For the period following the execution of this Agreement until Trend
          Micro takes delivery of the stock certificates representing the
          Shares, Nihon Unisoft shall not issue new shares, convertible bonds,
          or bonds with new share acquisition rights without obtaining the prior
          written consent of Trend Micro.

     6)   No false entries were included in the business reports, balance
          sheets, income statements, accompanying details and specifications,
          and monthly settlement statements issued in the business years from
          1996 through 1999, as well as the most recent business plan.

     7)   As of the execution date of this Agreement, Nihon Unisoft is not a
          party to litigation, a provisional attachment, or a provisional
          disposition case.

2.   Trend Micro may immediately cancel this Agreement in the event Yamada
     violates the provisions of the preceding Article. In addition, in such
     instances, Trend Micro may seek jointly and severally from Yamada and Nihon
     Unisoft compensation of damages suffered as the result of such breach.

Article 3  Designation of Purchase Parties

Trend Micro may, at its own discretion, designated its subsidiary companies as
the parties purchasing the Shares.  In such instances, Yamada and Nihon Unisoft
shall treat the subsidiaries designated by Trend Micro as the concerned parties.

Article 4  Confidentiality

Trend Micro, Yamada and Nihon Unisoft shall exercise the same degree of care
afforded their own confidential information with regard to the existence and
content of this Agreement as well as the confidential information of the other
parties obtained with regard to this Agreement, and shall not disclose or
divulge the same to a third party without the prior written consent of all other
parties.
<PAGE>

Article 5  Cancellation of Agreement

In the event any party is in breach of this Agreement, and fails to correct said
breach within 10 days after written notice from another party requesting the
correction thereof, the other party may cancel this Agreement.  However, the
exercise of the cancellation right under this Article shall not preclude the
seeking of compensation of damages.

Article 6  Assignment

The parties to this Agreement may not transfer their rights or obligations under
this Agreement to a third party without the prior written consent of the other
parties.

Article 7  Nullification of Prior Agreement

All parties to this Agreement hereby agree that, simultaneously with execution
of this Agreement, that certain "Stock Purchase and Sale Agreement " executed by
and among Trend Micro, Yamada and Nihon Unisoft on January 25, 2000 shall be
null and void.

Article 8  Agreed Jurisdiction

Trend Micro, Yamada and Nihon Unisoft hereby agree that the Tokyo District Court
shall be the court of first instance having exclusive jurisdiction over all
disputes arising from or in relation to this Agreement.

IN WITNESS of this Agreement, three originals hereof are created, and upon the
names and seals of each of Trend Micro, Yamada and Nihon Unisoft, one original
hereof shall be retained by each.

     February 22, 2000

     Odakyu Southern Tower 10F. 2-2-1 Yoyogi, Shibuya-ku, Tokyo
     Trend Micro Incorporated
     Chang Ming Jung, Representative Director

     Yamada:

     Nihon Unisoft:
<PAGE>

                       STOCK PURCHASE AND SALE AGREEMENT

TREND MICRO INCORPORATED (hereinafter, "Trend Micro"), INFOS (hereinafter,
"InfoS"), and NIHON UNISOFT CORPORATION (hereinafter, "Nihon Unisoft") hereby
execute this agreement as follows (hereinafter, this "Agreement") concerning the
purchase and sale and like matters of Nihon Unisoft shares held by InfoS to
Trend Micro.

Article 1 Purchase and Sale of Shares

1.   InfoS, in accordance with the terms and conditions contained in this
     Agreement, shall sell to Trend Micro the shares of Nihon Unisoft in the
     manner noted hereunder, and Trend Micro shall purchase the same from InfoS
     (hereinafter, the shares set forth below as subject to the purchase and
     sale shall be referred to as the "Shares"). Within 6 business days after
     the date of execution of this Agreement, InfoS shall deliver to Trend Micro
     share certificates which represent the Shares.

               Par-value common stock    1,334 shares
                                         -----

               Par-value per share       50,000 yen
                                         ------

               Purchase price amount per share  1,000,000 yen
                                                ---------

2.   Trend Micro shall divide the total purchase price of the Shares of
     1,334,000,000 yen into two installments, and shall make payment thereof by
     -------------
     remitting to a bank account prescribed by InfoS: 1) 75% of the total price
     within 6 business days after receiving the share certificates representing
     the Shares from InfoS, and 2) 25% of the total price within 6 months after
     receiving the share certificate(s) representing the Shares from InfoS.
     Interest at the rate of 5% per annum shall accrue on the purchase price of
     the Shares.

Article 2 Representations and Warranties

1.   InfoS and Nihon Unisoft hereby make the following representations and
     warranties.

     1)   Nihon Unisoft is a legally established and legally operated kabushiki
          gaisha stock company.

     2)   At the time of the execution of this Agreement, InfoS validly holds
          title and ownership with regard to all the certificates representing
          the Shares, and no lien or security rights shall be established upon
          said certificates as of the time of delivery thereof to Trend Micro.

     3)   The approval of the Board of Directors at Nihon Unisoft and all other
          procedures required under laws, ordinances and the articles of
          incorporation have been legally completed with regard to transfer of
          the Shares pursuant to this Agreement.
<PAGE>

     4)   At the time of the execution of this Agreement, the total number of
          common stock shares issued and outstanding of Nihon Unisoft is 2,400
          shares, there are no existing convertible bonds or bonds with new
          share acquisition rights or the like, and further, there does not
          exist any latent or potential shares pursuant to subscription rights
          to new shares or the like.

     5)   For the period following the execution of this Agreement until Trend
          Micro takes delivery of the stock certificates representing the
          Shares, Nihon Unisoft shall not issue new shares, convertible bonds,
          or bonds with new share acquisition rights without obtaining the prior
          written consent of Trend Micro.

     6)   No false entries were included in the business reports, balance
          sheets, income statements, accompanying details and specifications,
          and monthly settlement statements issued in the business years from
          1996 through 1999, as well as the most recent business plan.

     7)   As of the execution date of this Agreement, Nihon Unisoft is not a
          party to litigation, a provisional attachment, or a provisional
          disposition case.

2.   Trend Micro may immediately cancel this Agreement in the event InfoS
     violates the provisions of the preceding Article. In addition, in such
     instances, Trend Micro may seek jointly and severally from InfoS and Nihon
     Unisoft compensation of damages suffered as the result of such breach.

Article 3  Designation of Purchase Parties

Trend Micro may, at its own discretion, designated its subsidiary companies as
the parties purchasing the Shares.  In such instances, InfoS and Nihon Unisoft
shall treat the subsidiaries designated by Trend Micro as the concerned parties.

Article 4  Confidentiality

Trend Micro, InfoS and Nihon Unisoft shall exercise the same degree of care
afforded their own confidential information with regard to the existence and
content of this Agreement as well as the confidential information of the other
parties obtained with regard to this Agreement, and shall not disclose or
divulge the same to a third party without the prior written consent of all other
parties.

Article 5  Cancellation of Agreement

In the event any party is in breach of this Agreement, and fails to correct said
breach within 10 days after written notice from another party requesting the
correction thereof, the other party may cancel this Agreement.  However, the
exercise of the cancellation right under this Article shall not preclude the
seeking of compensation of damages.
<PAGE>

Article 6  Assignment

The parties to this Agreement may not transfer their rights or obligations under
this Agreement to a third party without the prior written consent of the other
parties.

Article 7  Nullification of Prior Agreement

All parties to this Agreement hereby agree that, simultaneously with execution
of this Agreement, that certain "Stock Purchase and Sale Agreement " executed by
and among Trend Micro, InfoS and Nihon Unisoft on January 25, 2000 shall be null
and void.

Article 8  Agreed Jurisdiction

Trend Micro, InfoS and Nihon Unisoft hereby agree that the Tokyo District Court
shall be the court of first instance having exclusive jurisdiction over all
disputes arising from or in relation to this Agreement.

IN WITNESS of this Agreement, three originals hereof are created, and upon the
names and seals of each of Trend Micro, InfoS and Nihon Unisoft, one original
hereof shall be retained by each.

     February 22, 2000

     Odakyu Southern Tower 10F. 2-2-1 Yoyogi, Shibuya-ku, Tokyo
     Trend Micro Incorporated
     Chang Ming Jung, Representative Director

     InfoS:

Nihon Unisoft:

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