Document:

<PAGE>   1
                                                                    Exhibit 10.3

                         SEVERANCE AGREEMENT AND RELEASE

        The employment of Kevin Fink ("Executive") with N2H2, Inc. ("Employer"),
is being terminated. Executive and Employer desire to settle and resolve all
possible disputes between them growing out of Executive's employment or
termination of employment, and it is therefore agreed as follows:

        1. CONFIDENTIALITY OF AGREEMENT; AGREEMENT NOT ADMISSION. Executive and
Employer agree to keep this Severance Agreement and Release ("Agreement")
confidential, except insofar as disclosure may be required for legal or business
reasons. This Agreement is not an admission by Employer that it (or any of its
employees) has violated any law or failed to fulfill any duty to Executive. This
Agreement is not an admission by Executive that he has violated any law or
failed to fulfill any duty to Employer.

        2. TERMINATION OF EMPLOYMENT. Employer and Executive agree that
Executive's employment is terminated by Employer, without cause, effective June
15, 2001 ("Effective Date"). Employer agrees not to contest any application for
unemployment insurance benefits that Executive may file with the Washington
Employment Security Department, except to the extent Executive may make
materially false statements therein. Employer agrees that a statement therein to
the effect that Executive was discharged by Employer as a part of a reduction in
force is not materially false.

        3. RESIGNATIONS. On the Effective Date, Executive will be deemed to have
resigned as the Chief Technology Officer of Employer.

        4. SEVERANCE. In full consideration and in return for Executive's
release herein, Employer agrees to (i) pay Executive severance equal to six (6)
weeks' base salary plus base salary in lieu of 225.05 hours of unused vacation,
subject to lawful deductions, payable on the fifteenth day after this Agreement
is signed by Executive and delivered to Employer and (ii) restructure
Executive's loan from Employer pursuant to the terms set forth in the Promissory
Note attached hereto as Exhibit A (the "Note").

        5. COMPANY PROPERTY. As part of the severance package and in return for
Executive's release herein, Executive shall also be entitled to retain the
computer server and related equipment that was located in his home office while
employed by Employer.

        6. EXECUTIVE'S WAGES. Executive acknowledges that he has received his
regularly scheduled base salary through the Effective Date, subject to lawful
deductions. Executive acknowledges that no additional wages are due from
Employer.

        7. RETURN OF RECORDS, CONFIDENTIAL INFORMATION AND PROPERTY. Except as
otherwise provided in Section 5 above and the next sentence, Executive agrees
that within three months of the Effective Date, Executive will return to
Employer all property and equipment furnished to or prepared by Executive in the
course of or incident to Executive's employment by Employer, including, without
limitation, the Sony laptop computer and Ricochet modem.

<PAGE>   2

Executive also agrees to return all Confidential Information (as that term is
defined under Section 7 of the Executive Employment Agreement between Executive
and Employer dated December 11, 2000 ("Employment Agreement")) in accordance
with Section 7(c) of the Employment Agreement.

        8. MUTUAL RELEASE. Executive accepts Employer's undertakings in this
Agreement as full settlement of, and hereby releases, any and all claims, known
or unknown, arising out of or related to Executive's employment with Employer,
or its termination. Employer accepts Executive's undertakings in this Agreement
as full settlement of, and hereby releases, any and all claims, known or
unknown, arising out of or related to his employment with Employer and, except
to the extent of Executive's liability under the Note, any liability of
Executive to Employer on account of loans or advances made by Employer to or for
the benefit of Executive. Simultaneously with the execution of this Agreement,
Employer agrees to deliver to Executive the originals of all promissory notes
(other than the Note) made by Executive to Employer. The release by Executive
includes, but is not limited to, any claims for damages or attorneys' fees, lost
salary, lost benefits or stock options, and specifically includes, but is not
limited to, claims under the Age Discrimination in Employment Act ("ADEA").
These claims are examples, not a complete list, of the released claims, as it is
the parties' intent that Executive release any and all claims, of whatever kind
or nature, in exchange for the severance arrangement set forth in Section 4
above. Executive realizes this constitutes a full and final settlement of any
and all such claims, and except for obligations arising under this Agreement,
this Agreement releases Employer and any related companies (and their owners,
officers, employees, successors, assigns, and anyone else against whom Executive
could assert a claim based on Executive's experiences as an employee of Employer
or Executive's termination as an employee) from any further liability to
Executive (or to anyone else Executive has power to bind in this settlement) in
connection with such claims.

        9. NON-DISPARAGEMENT. Executive agrees that neither he, nor anyone
acting on his behalf, will make any negative, derogatory, or disparaging
statements, whether oral or written, regarding Employer. Employer agrees that
neither it, nor anyone acting on its behalf, will make any negative, derogatory,
or disparaging statements, whether oral or written, regarding Executive.

        10. SURVIVAL. Notwithstanding any other provision of this Agreement,
Executive acknowledges and agrees that termination of his employment with
Employer will not terminate or otherwise affect his obligations under: (i)
Sections 7, 8 and 9 of the Employment Agreement; and (ii) the restrictive
covenants set forth in Section 9 of the Employment Agreement.

        11. GENERAL. This Agreement (i) contains the entire understanding of the
parties with respect to the subject matter covered, except for Executive's
obligations under Sections 7, 8 and 9 of his Employment Agreement; (ii)
supersedes all prior or contemporaneous understandings, except for Executive's
obligations under Sections 7, 8 and 9 of his Employment Agreement; (iii) may
only be amended in a written instrument signed by both parties; and (iv) shall
be governed by the laws of the State of Washington. The parties each warrant
that they are the true parties in interest, and fully authorized to execute this
Agreement.

                                       2
<PAGE>   3

        12. KNOWING AND VOLUNTARY WAIVER. Executive acknowledges that he has
been advised to consult with an attorney, and has had the opportunity to do so,
before signing this Agreement, which Executive has been given reasonable time to
consider, and which Executive may revoke within seven (7) days after signing.

        13. STOCK OPTION. The stock option granted pursuant to Section 4(g) of
the Employment Agreement (the "Stock Option") shall vest on December 11, 2001
and will be exercisable until December 11, 2003. Executive further agrees that
any proceeds from the sale of the shares acquired pursuant to the exercise of
the Stock Option shall be used to prepay the Note to the extent any amounts
remain unpaid thereunder (whether or not then due under its terms).

Dated:  June 20, 2001                    /s/ Kevin Fink
                                         -----------------------------
                                         Kevin Fink

Dated:  June 20, 2001                    N2H2, INC.

                                         By /s/ Philip Welt
                                            ------------------------------
                                            Philip Welt, President and CEO

                                       3
<PAGE>   4

                                    EXHIBIT A

                                 PROMISSORY NOTE

$291,826.80                                                 Seattle, Washington
                                                                   June 15, 2001

The undersigned, Kevin Fink ("MAKER"), promises to pay to N2H2, Inc. or order
(collectively, "HOLDER"), the principal sum of Two Hundred Ninety-One Thousand,
Eight Hundred Twenty-Six Dollars and Eighty Cents ($291,826.80), in lawful money
of the United States of America, all as hereinafter provided and upon the
following agreements, terms and conditions.

            Interest Rate. The entire principal balance of this Note shall bear
simple interest from the date of this Note until this Note is fully paid at the
rate of six and seven-eighths percent (6.875%) per annum.

            Payments. Maker shall repay this Note by making monthly payments of
principal and interest in the amount of $2,241.11 commencing on July 30, 2001,
and continuing on the last day of each succeeding calendar month until the Note
is paid in full. The Note may be paid in full or in part at any time or from
time to time without penalty, but partial prepayment of this Note shall not
reduce the amount of the monthly payment Maker is required to make under the
preceding sentence. Upon a "Change in Control" of the Holder, as defined below,
the entire principal balance of this Note plus all accrued but unpaid interest
shall be deemed fully paid. "Change in Control" shall mean (i) the consummation
of a merger or consolidation of the Holder with or into another entity or any
other corporate reorganization, if more than 50% of the combined voting power of
the continuing or surviving entity's securities outstanding immediately after
such merger, consolidation or other reorganization is owned by persons who were
not shareholders of the Holder immediately prior to such merger, consolidation
or other reorganization, or (ii) the sale, transfer or other disposition of all
or substantially all of the Holder's assets.

            Place of Payment. All payments pursuant to this Note shall be made
to Holder at 900 Fourth Avenue, Suite 3600, Seattle, Washington 98164, or such
other address as Holder may hereafter designate from time to time.

            Default; Default Interest. If Maker fails to pay this Note in strict
accordance with its terms, or if Maker otherwise defaults under this Note, and
such failure or default is not cured within 10 days following Holder's delivery
to maker of written notice of default, this Note shall bear interest from the
date of default by Maker until the default is fully cured at a default interest
rate ("Default Rate") equal to sixteen percent (16%) per annum and at the option
of Holder, this entire Note shall become immediately due and payable.

            Applicable Law. This Note shall be construed in accordance with and
governed by the laws of the State of Washington.

            Successors and Assigns. This Note shall inure to the benefit of
Holder and any successor or assignee of Holder. This Note shall be binding upon
Maker and Maker's successors, assignees, personal representatives and heirs.

                                       4
<PAGE>   5

            Costs and Expenses. Maker shall pay all costs and expenses which
Holder may incur in connection with this Note because of Maker's default,
including, without limitation, the following costs: (a) reasonable attorneys'
fees for legal services incurred by Holder in connection with any default by
Maker relating to any determination of any rights or remedies of Holder; and (b)
reasonable attorneys' fees for any actions, proceedings, reviews or appeals
therefrom which Holder may institute or in which Holder may appear or
participate.

            Liability. Maker hereby waives demand, presentment for payment,
notice of intention to accelerate the maturity, protest and notice of protest
and nonpayment. Maker hereby further agrees that none of the following events
(with or without notice) shall diminish, impair or otherwise affect his
liability with respect to this Note: (a) any modification or extension of the
terms of this Note; or (b) any release of any party liable pursuant to this
Note.

ORAL AGREEMENTS OR ORAL COMMITMENTS TO LOAN MONEY, EXTEND CREDIT, OR TO FORBEAR
FROM ENFORCING REPAYMENT OF A DEBT ARE NOT ENFORCEABLE UNDER WASHINGTON LAW.

                                        /s/ Kevin Fink
                                        ----------------------------
                                        Kevin Fink, Maker

                                       5<PAGE>   1
                                                                    EXHIBIT 10.4

                            EIGHTH AMENDMENT TO LEASE

        THIS EIGHTH AMENDMENT TO LEASE (hereafter "Eighth Amendment") is made
and entered into this 31st day of May, 2001, by and between WALTON SEATTLE
INVESTORS I, L.L.C., a Delaware limited liability company as Landlord, and N2H2,
INC., a Washington corporation, as Tenant.

                                    RECITALS

        A. Landlord and Tenant have entered into that certain Office Lease dated
March 12, 1999, as amended by the First Amendment to Lease dated June 16, 1999,
the Second Amendment to Lease dated August 10, 1999, and the Third Amendment to
Lease dated August 12, 1999, the Fourth Amendment to Lease dated October 12,
1999, the Fifth Amendment to Lease dated February 14, 2000, and Sixth Amendment
to Lease dated April 4, 2000,Seventh Amendment to Lease dated December 14, 2000
(as amended, the "Lease"), whereby Landlord has leased to Tenant and Tenant has
leased from Landlord approximately 55,887 rentable square feet, known as Suite
3400 ("Initial Premises"), in that certain building located at 900 Fourth
Avenue, Seattle, Washington 98164 ("Building").

        B. Landlord and Tenant desire to further amend certain terms and
conditions of the Lease whereby Tenant shall surrender possession of the space
known as Suite 3350 constituting approximately 4,255 rentable square feet on the
33rd floor as highlighted on attached Exhibit A-1 ("33rd Floor Premises") and be
released from the obligations pertaining thereto as more fully set forth in this
Eighth Amendment.

        C. All capitalized terms not otherwise defined herein shall have the
same meaning as set forth in the Lease.

        NOW, THEREFORE, in consideration of the mutual covenants and conditions
stated herein, Landlord and Tenant hereby modify, amend and supplement the Lease
and agree as follows:

1.   SPACE REDUCTION DATE. The surrender date of the 33rd floor Premises (as
     defined below) shall be midnight, June 30, 2001 (the "Space Reduction
     Date") so long as the Condition set forth in Section 6 is met. Prior to the
     Space Reduction Date, Landlord shall have unrestricted access to the 33rd
     Floor Premises for the purposes of preparing such space for occupancy by
     another tenant.

2.   PREMISES. On the Space Reduction Date, Tenant shall unconditionally and
     irrevocably surrender to Landlord and Landlord shall retake possession from
     Tenant of the 33rd Floor Premises. From and after the Space Reduction Date,
     the 33rd Floor Premises shall be subtracted and hereby excluded from the
     definition of Initial Premises, which, from and after the Space Reduction
     Date shall constitute a total of 38,724 rentable square feet, as more
     particularly shown on Exhibit A-2.

3.   RELEASE. From and after the Space Reduction Date, Tenant shall release
     Landlord and Landlord's partners, officers, directors, agents, employees,
     successors, assigns, property manager and contractors from each and every
     claim of every type and nature arising from the Lease as it relates to the
     33rd Floor Premises, Tenant's occupancy of the 33rd Floor Premises, and the
     relationship of Landlord and Tenant as landlord and tenant under the Lease
     relating to the 33rd Floor Premises excepting only any claims relating to
     or arising out of obligations of Landlord which, pursuant to the Lease,
     survive the expiration or earlier termination of the Lease. From and after
     the Space Reduction Date, Landlord shall release Tenant and Tenant's
     respective partners, officers, directors, agents, employees, successors,
     assigns and contractors from each and every claim of every type and nature
     arising from the Lease as it relates to the 33rd Floor Premises, Tenant's
     occupancy of the 33rd Floor Premises, and the relationship of Landlord and
     Tenant as landlord and tenant under the Lease relating to the 33rd Floor
     Premises, excepting only any claims relating to or arising out of any
     obligations of Tenant, which pursuant to the Lease, survive the expiration
     or earlier termination of the Lease. The foregoing releases shall not apply
     to claims or causes of action arising from or in connection with the
     enforcement or interpretation of the rights and obligations of the parties
     under this Agreement.

4.   BASE RENT: Section 1.l) of the Lease shall be replaced in its entirety with
     the following: .....................................

<TABLE>
<S>                                                                                 <C>
     Rent Schedule:.................................................................Total Base Rent
     Space Reduction Date through 12/31/01:.........................................$96,719.98
     01/01/02 through 12/31/02:.....................................................$99,946.97
     01/01/03 through 12/31/03:.....................................................$103,173.98
     01/01/04 through 11/30/04:.....................................................$106,251.92
     12/01/04 through 04/30/05:.....................................................$110,462.95
</TABLE>

                                       1
<PAGE>   2
<Table>
<S>                                                                                 <C>
     05/01/05 through 08/31/05:.....................................................$110,154.15
</Table>

5.   RENT CREDIT: So long as Tenant is not in default of the Lease, Tenant shall
     receive a rent credit of $500.00 per month ("Rent Credit"). The Rent Credit
     shall commence with the first payment of Rent due after such time as the
     Rent Credit which otherwise would have been earned by Tenant has been
     applied to cover all legal fees incurred by Landlord with respect to this
     Amendment or the reletting of the 33rd Floor Premises For example, if
     Landlord incurs legal fees of $2,000 with respect to this Amendment and the
     reletting of the 33rd Floor Premises, then the Rent Credit shall commence
     on September 1, 2001 (four months of Credit at $500 per month).

6.   CONDITION. This Amendment is conditioned upon Landlord and Verio, Inc.
     executing a lease agreement for the 33rd Floor Premises prior to the Space
     Reduction Date.

7.   PARKING: Section 1.q) is hereby replaced with the following:

     Thirty-five (35) unreserved stalls at the prevailing market rate.

8.   ENTIRE AGREEMENT. This Agreement represents the entire understanding
     between the parties hereto with respect to the partial termination of the
     Lease. This Agreement shall not be modified by either party by oral
     representation made before or after the execution of this Agreement, and
     all modifications shall be in writing signed by the party against whom
     enforcement of such modification is to be sought.

9.   NO CONFLICT. Except as modified by this Eighth Amendment, the terms and
     conditions of the Lease shall remain in full force and effect. In the event
     of any conflict between the terms of this Eighth Amendment and the Lease,
     this Eighth Amendment shall govern and control the intent and agreement of
     the parties.

IN WITNESS WHEREOF, the parties hereto have executed this Eighth Amendment to
Lease as of the date first set forth above.

LANDLORD:

WALTON SEATTLE INVESTORS I, L.L.C.,
a Delaware limited liability company

            By:  Walton Street Real Estate Fund I, L.P.,
                 a Delaware limited partnership,
                 Manager

                 By:  Walton Street Managers I, L.P.,
                      a Delaware limited partnership,
                      General Partner

                      By:  WSC Managers I, Inc.,
                           a Delaware corporation,
                           General Partner

                           By:  /s/ Douglas J. Welker
                                ---------------------
                                Douglas J. Welker,
                                Vice-President

TENANT:

N2H2, INC.,
a Washington corporation, as Tenant.

By:  /s/ J. Paul Quinn
     --------------------------
     J. Paul Quinn,
     CFO

                                       2
<PAGE>   3

                                   NOTARY PAGE

STATE OF ILLINOIS            )
                             )      :ss.
COUNTY OF COOK               )

I certify that I know or have satisfactory evidence that the person appearing
before me and making this acknowledgment is the person whose true signature
appears on this document.

On this ___ day of March, 2001, before me personally appeared DOUGLAS J. WELKER,
to me known to be the VICE PRESIDENT of WSC MANAGERS I, INC., a Delaware
corporation, the corporation that executed the within and foregoing instrument
as GENERAL PARTNER of WALTON STREET MANAGERS I, L.P., a Delaware limited
partnership, the GENERAL PARTNER of WALTON STREET REAL ESTATE FUND I, L.P., a
Delaware limited partnership, the MANAGER of WALTON SEATTLE INVESTORS I, L.L.C.,
a Delaware limited liability company, the company joint venture that executed
the within and foregoing instrument, and acknowledged the said instrument to be
the free and voluntary act and deed of said joint venture, for the uses and
purposes therein mentioned, and on oath stated that he/she was authorized to
execute said instrument.

WITNESS my hand and seal hereto affixed the day and year first above written.

                               ----------------------------------------
                                      LA DUKE
                               ----------------------------------------
                               [Type or Print Name]

                               Notary Public in and for the State of Illinois,
                               residing at Chicago, IL
                                          --------------------------- .
                               My Appointment Expires:  9-05-04
                                                      --------------- .

STATE OF WASHINGTON        )
                           )      :ss.
COUNTY OF KING             )

On this ___ day of March, 2001, before me personally appeared J. PAUL QUINN to
me known to be the CFO of N2H2, INC., the corporation that executed the within
and foregoing instrument, and acknowledged the said instrument to be the free
and voluntary act and deed of said corporation, for the uses and purposes
therein mentioned, and on oath stated that he/she was authorized to execute the
said instrument and that the seal affixed, if any, is the corporate seal of said
corporation.

IN WITNESS, WHEREOF, I have hereunto set my hand and affixed my official seal
the day and year first above written.

                               ----------------------------------------
                                    Janis Boucher
                               ----------------------------------------
                               [Type or Print Name]

                               Notary Public in and for the State of Washington,
                               residing at Bethell, WA
                                          --------------------------- .
                               My Appointment Expires:  1-28-04
                                                      --------------- .

                                       3
<PAGE>   4

                                   EXHIBIT A-1

                               33RD FLOOR PREMISES

                (Floor plans showing Recaptured Premises shaded)

                                    [GRAPHIC]

(c)NORTH                                                           *NOT TO SCALE

                                       4
<PAGE>   5

                                   EXHIBIT A-2

                                    PREMISES

                                   34TH FLOOR

                      (Floor plans showing Premises shaded)

                                    [GRAPHIC]

(c)NORTH                                                           *NOT TO SCALE

                                    PREMISES

                                   35TH FLOOR

                      (Floor plans showing Premises shaded)

                                    [GRAPHIC]

(c)NORTH                                                           *NOT TO SCALE

                                       5
<PAGE>   6

                             EXHIBIT A-2 (CONTINUED)

                                    PREMISES

                                   36TH FLOOR

                      (Floor plans showing Premises shaded)

                                    [GRAPHIC]

(c)NORTH                                                           *NOT TO SCALE

                                       6

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00028-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00028-of-00352.parquet"}]]