SUPPLEMENTAL RETIREMENT BENEFIT PLAN

     This Supplemental Retirement Benefit Plan (the "Plan") adopted
 effective as of November 12, 1991, and amended August 24, 1997, by
 Mosinee Paper Corporation, a Wisconsin corporation, ("Mosinee") for the
 purposes of providing deferred compensation in the form of supplemental
 retirement benefits for San W. Orr, Jr.  ("Mr. Orr") in recognition of
 his service to Mosinee as its Chairman of the Board of Directors is
 hereby further amended effective as of this 4th day of March, 1999.

     1.   NORMAL SUPPLEMENTAL RETIREMENT BENEFIT.  Beginning on the
 first day of the first month following the last to occur of (a) Mr.
 Orr's termination of employment with each of Mosinee and its parent,
 Wausau-Mosinee Paper Corporation ("Wausau") or (b) Mr. Orr's 60th
 birthday, and continuing on the first day of each succeeding month,
 Mosinee shall pay to Mr. Orr, if he is then living, a monthly
 supplemental retirement benefit (Mr. Orr's "Normal Supplemental
 Retirement Benefit") in an amount equal to 50% of one-twelfth of Mr.
 Orr's highest final average W-2 compensation for the five consecutive
 calendar year period in which such compensation was paid.  Mr. Orr's
 Normal Supplemental Retirement Benefit shall not be reduced or offset
 by the amount of any other payment then due him from Mosinee or any
 other plan or program now or hereafter maintained by Mosinee.

     2.   SURVIVING SPOUSE BENEFIT.  From and after the first day of the
 first month following the later of (a) the month in which Mr. Orr's
 death occurs or (b) the month in which Mr. Orr would have attained his
 60th birthday if Mr. Orr's death occurs before he has attained age 60,
 and continuing on the first day of each succeeding month, Mosinee shall
 pay to Mr. Orr's spouse, if then living (Mr. Orr's "Surviving Spouse"),
 a monthly benefit (the "Supplemental Surviving Spouse Benefit") in an
 amount equal to 50% of the Normal Supplemental Retirement Benefit to
 which Mr. Orr would have then been entitled had he then been living.

     3.   CHANGE IN CONTROL OF WAUSAU-MOSINEE.

          (a)  In the event a Change in Control of Wausau occurs prior
     to Mr. Orr's death, Mosinee shall pay to Mr. Orr a lump sum amount
     equal to the present value of Mr. Orr's Normal Supplemental
     Retirement Benefit, as determined hereunder, as of the first day of
     the first month following such Change in Control of Wausau on which
     Mr. Orr is neither an employee nor a director of Wausau, whether
     or not such Change in Control occurred prior to the date on which
     Mr. Orr shall have ceased to be an employee or a director of
     Wausau.  Upon payment of the lump sum amount provided for in this
     subparagraph (a), Mosinee shall have no further obligation to pay
     any benefits under this Plan.

          (b)  In the event a Change in Control of Wausau occurs after
     Mr. Orr's death and whether or not the Supplemental Surviving
     Spouse Benefit shall have then become payable, Mosinee shall pay to
     Mr. Orr's Surviving Spouse, if then living, the present value of
     the unpaid Supplemental Surviving Spouse Benefit. Upon payment of
     the lump sum amount provided for in this subparagraph (b), Mosinee
     shall have no further obligation to pay any benefits under this
     Plan.

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          (c)  For purposes of this plan, a "Change in Control of
     Wausau" shall be mean the happening of any of the following events:

          (1)  The acquisition by any individual, entity or group
          (within the meaning of Section 13(d)(3) or 14(d)(2) of the
          Exchange Act (a "Person") of beneficial ownership (within the
          meaning of Rule 13d-3 promulgated under the Exchange Act) of
          20% or more of either (A) the then outstanding shares of
          common stock of Wausau (the "Outstanding Corporation Common
          Stock") or (B) the combined voting power of the then
          outstanding voting securities of Wausau entitled to vote
          generally in the election of directors (the "Outstanding
          Corporation Voting Securities"); excluding, however, the
          following: (i) any acquisition directly from Wausau other
          than an acquisition by virtue of the exercise of a conversion
          privilege unless the security being so converted was itself
          acquired directly from Wausau, (ii) any acquisition by Wausau,
          (iii) any acquisition by any employee benefit plan (or related
          trust) sponsored or maintained by Wausau or any entity
          controlled by Wausau, (iv) any acquisition pursuant to a
          transaction which complies with clauses (A), (B), and (C) of
          paragraph (3) of this Section 3(c), (v) except as provided in
          paragraphs (4) and (5), any acquisition by any of the Woodson
          Entities or any of the Smith Entities, or (vi) any increase in
          the proportionate number of shares of Outstanding Corporation
          Common Stock or Outstanding Corporation Voting Securities
          beneficially owned by a Person to 20% or more of the shares of
          either of such classes of stock if such increase was solely
          the result of the acquisition of Outstanding Corporation
          Common Stock or Outstanding Corporation Voting Securities by
          Wausau; provided, however, that this clause (vi) shall not
          apply to any acquisition of Outstanding Corporation Common
          Stock or Outstanding Corporation Voting Securities not
          described in clauses (1), (ii), (iii), (iv), or(v) of this
          paragraph (1) by the Person acquiring such shares which occurs
          after such Person had become the beneficial owner of 20% or
          more of either the Outstanding Corporation Common Stock or
          Outstanding Corporation Voting Securities by reason of share
          purchases by Wausau; or

          (2)  A change in the composition of the Board such that the
          individuals who, as of the Effective Date, constitute the
          Board (such Board shall be hereinafter referred to as the
          "Incumbent Board") cease for any reason to constitute at
          least a majority of the Board; provided, however, for purposes
          of the Plan, that any individual who becomes a member of the
          Board subsequent to the Effective Date whose election, or
          nomination for election by Wausau's shareholders, was approved
          by a vote of at least a majority of those individuals who are
          members of the Board and who were also members of the
          Incumbent Board (or deemed to be such pursuant to this
          proviso) shall be deemed to be and shall be considered as
          though such individual were a member of the Incumbent Board,
          but provided, further, that any such individual whose initial
          assumption of office occurs as a result of either an actual or

          threatened election contest (as such terms are used
          in Rule 14a-11 of Regulation 14A promulgated under the 
          Exchange Act) or other actual or threatened solicitation of
          proxies or consents by or on behalf of a Person other than the
          Board shall not be so deemed or considered as a member of the
          Incumbent Board; or

          (3)  Consummation of a reorganization, merger or
          consolidation, or sale or other disposition of all or
          substantially all of the assets of Wausau or the acquisition
          of the assets or securities of any other entity (a "Corporate
          Transaction"); excluding, however, such a Corporate
          Transaction pursuant to which (A) all or substantially all of
          the individuals and entities who are the beneficial owners,
          respectively, of the Outstanding Corporation Common Stock and
          Outstanding Corporation Voting Securities immediately prior to
          such Corporate Transaction will beneficially own, directly or
          indirectly, more than 60% of, respectively, the outstanding
          shares of common stock and the combined voting power of the
          then outstanding voting securities entitled to vote generally
          in the election of directors, as the case may be, of
          the corporation  resulting from such Corporate Transaction
          (including, without limitation, a corporation which as a
          result of such transaction owns or all or substantially all
          of Wausau's assets either directly or through one or more
          subsidiaries) (the "Resulting Corporation") in substantially
          the same proportions as their ownership, immediately prior to
          such Corporate Transaction, of the Outstanding Corporation
          Common Stock and Outstanding Corporation Voting Securities, as
          the case may be, (B) no Person (other than Wausau, any
          employee benefit plan (or related trust) of Wausau, any
          Woodson Entity, any Smith Entity, or such Resulting
          Corporation) will beneficially own, directly or indirectly,
          20% or more of, respectively, the outstanding shares
          of common stock of the Resulting Corporation or the combined
          voting power of the then outstanding voting securities of such
          Resulting Corporation entitled to vote generally in the
          election of directors except to the extent that such ownership
          existed with respect to Wausau prior to the Corporate
          Transaction, and (C) individuals who were members of the
          Incumbent Board will constitute at least a majority of the
          members of the board of directors of the Resulting
          Corporation; or

          (4)  The Woodson Entities acquire beneficial ownership of more
          than 35% of the Outstanding Corporation Common Stock or
          Outstanding Corporation Voting Securities or of the
          outstanding shares of common stock or the combined voting
          power of the then outstanding voting securities entitled to
          vote generally in the

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          election of directors, as the case may be, of the Resulting
          Corporation; or

          (5)  The Smith Entities acquire beneficial ownership of more
          than 35% of the Outstanding Corporation Common Stock or
          Outstanding Corporation Voting Securities or of the
          outstanding shares of common stock or the combined voting
          power of the then outstanding voting securities entitled to
          vote generally in the election of directors, as the case may
          be, of the Resulting Corporation; or

         (6)  The approval by the shareholders of Wausau of a complete
          liquidation or dissolution of Wausau.

          For purposes of this Section 3(c), the term "Woodson Entities"
     shall mean Aytchmonde P. Woodson, Leigh Yawkey Woodson and Alice
     Richardson Yawkey, members of their respective families and their
     respective descendants (the "Woodson Family"), heirs or legatees of
     any of the Woodson Family members, transferees by will, laws of
     descent or distribution or by operation of law of any of the
     foregoing (including of any such transferees) (including any
     executor or administrator of any estate of any of the foregoing),
     any trust established by any of Aytchmonde P. Woodson, Leigh Yawkey
     Woodson, or Alice Richardson Yawkey, whether pursuant to last will
     or otherwise, any partnership, trust or other entity established
     primarily for the benefit of, or any other Person the beneficial
     owners of which consist primarily of, any of the foregoing or any
     Affiliates or Associates of any of the foregoing or any charitable
     trust or foundation to which any of the foregoing transfers or may
     transfer securities of Wausau (including any beneficiary or
     trustee, partner, manager or director of any of the foregoing or
     any other Person serving any such entity in a similar capacity).

          For purposes of this Section 3(c), the term "Smith Entities"
     shall mean David B. Smith and Katherine S. Smith, members of their
     respective families and their respective descendants (the "Smith
     Family"), heirs or legatees of any of the Smith Family members,
     transferees by will, laws of descent or distribution or by
     operation of law of any of the foregoing (including of any such 
     transferees) (including any executor or administrator of any estate
     of any of the foregoing), any trust established by either of David
     B. Smith or Katherine S. Smith, whether pursuant to last will or
     otherwise, any partnership, trust or other entity established
     primarily for the benefit of, or any other Person the beneficial
     owners of which consist primarily of, any of the foregoing or any
     Affiliates or Associates of any of the foregoing or any charitable
     trust or foundation to which any of the foregoing transfers or may
     transfer securities of Wausau (including any beneficiary or 
     trustee, partner, manager or director of any of the foregoing or
     any other Person serving any such entity in a similar capacity).

                                    -4-

          For purposes of this Section 3(c), the terms "Affiliate" and
     "Associate" shall have the meanings ascribed to such terms in Rule
     12b-2 of the General Rules and Regulations under the Exchange Act
     as in effect on the date of this Plan.

          (e)  For purposes of this Plan, the present value of Mr. Orr's

     Normal Supplemental Retirement Benefit or the Supplemental
     Surviving Spouse Benefit shall be determined by reference to the
     1983 Individual Annuity Mortality Table with an assumed interest
     rate equal to the "immediate annuity rate" as then in effect as
     determined by the Pension Benefit Guaranty Corporation and
     promulgated in Appendix B to 29 C.F.R. <section>2619.65 or any
     successor regulation adopted for the same or substantially
     similar purpose.

     4.   SUPPLEMENTAL RETIREMENT BENEFITS IN ADDITION TO OTHER RIGHTS
 AND BENEFITS.  The rights and benefits conferred upon Mr. Orr (and Mr.
 Orr's Surviving Spouse) pursuant to this Plan shall be in addition to
 all other rights and benefits conferred upon Mr. Orr by Mosinee by
 reason of his employment.

     5.   NATURE OF MOSINEE'S OBLIGATIONS AND MR. ORR'S RIGHTS. Neither
 Mr. Orr nor his Surviving Spouse, if any, shall acquire any right,
 title or interest in the assets of Mosinee by reason of this Plan.
 To the extent Mr. Orr or his Surviving Spouse shall acquire a right to
 receive payments from Mosinee pursuant to this Plan, such right shall
 be no greater than the right of any unsecured general creditor
 of Mosinee.

     6.   ASSIGNMENT BY MR. ORR PROHIBITED.  This Plan and Mr. Orr's
 rights and benefits hereunder (and the rights of his surviving spouse,
 if any) shall not be subject to voluntary or involuntary sale, pledge,
 hypothecation, transfer or assignment by Mr. Orr or such Surviving
 Spouse, their personal representatives or heirs or any other person or
 persons or organization or organizations succeeding to any of their
 rights and benefits hereunder.

     7.   FUNDING.  All benefits paid or payable pursuant to the terms
 of this Plan shall be paid out of the general assets of Mosinee.

     8.   CLAIMS PROCEDURE.  The claims procedure set forth in the
 Wausau-Mosinee Paper Corporation Retirement Plan or any successor to
 such plan is incorporated herein by this reference as the claims
 procedure for this Plan.

     9.   PLAN ADMINISTRATOR.  The plan administrator and named
 fiduciary of this Plan shall be Mosinee.

     10.  BINDING EFFECT.  This Plan shall be binding upon and inure to
 the benefit of (1) Mr. Orr and his Surviving Spouse and their personal
 representatives and heirs and any other person or persons or
 organization or organizations succeeding to any of Mr. Orr's rights
 or benefits hereunder, and (2) Mosinee and its successors and assigns.

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     11.  SEVERABILITY.  The invalidity or unenforceability of any
 provision of this Plan shall not invalidate or render unenforceable any
 other provision of this agreement.

     12.  GOVERNING LAW.  This Plan shall be governed by the Employee
 Retirement Income Security Act of 1974, as amended, and to the extent
 not preempted by such Act, by the laws of the State of Wisconsin.

     IN WITNESS WHEREOF, Mosinee has caused this agreement to be
 executed by its President thereunto duly authorized as of the 4th
 day of March, 1999.

                            MOSINEE PAPER CORPORATION


                            By:
                                Daniel R. Olvey
                                As its President and Chief Executive
                                 Officer

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