PROBUSINESS SERVICES INC
S-8, 1997-10-03
COMPUTER PROCESSING & DATA PREPARATION
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<PAGE>   1
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON OCTOBER 3 ,1997
                                                 REGISTRATION NO. 333-__________




                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                            ________________________
                                    FORM S-8
                             REGISTRATION STATEMENT

                                      Under
                           THE SECURITIES ACT OF 1933
                            ________________________
                           PROBUSINESS SERVICES, INC.
               (Exact name of registrant as specified in charter)
                            ________________________

   Delaware                    4125 Hopyard Road                 94-2976066
  (State of               Pleasanton, California  94588       (I.R.S. Employer 
incorporation)     (Address of principal executive offices)  Identification No.)
                            ________________________
                             1989 STOCK OPTION PLAN
                             1996 STOCK OPTION PLAN
                        1997 EMPLOYEE STOCK PURCHASE PLAN
                            (Full title of the plans)
                            ________________________

                                Thomas H. Sinton
                      President and Chief Executive Officer
                           ProBusiness Services, Inc.
                                4125 Hopyard Road
                          Pleasanton, California 94588
                                 (510) 737-3500
(Name, address, and telephone number, including area code, of agent for service)
                            ________________________

                                    Copy to:
                                 ALAN K. AUSTIN
                               ELIZABETH R. FLINT
                        WILSON SONSINI GOODRICH & ROSATI
                            PROFESSIONAL CORPORATION
                               650 PAGE MILL ROAD
                               PALO ALTO, CA 94304
                                 (650) 493-9300
<TABLE>
<CAPTION>
=============================================================================================================
                                        CALCULATION OF REGISTRATION FEE
=============================================================================================================
                                                                    PROPOSED      PROPOSED
                      TITLE OF                        MAXIMUM        MAXIMUM       MAXIMUM
                     SECURITIES                        AMOUNT        OFFERING     AGGREGATE       AMOUNT OF
                       TO BE                            TO BE        PRICE PER    OFFERING      REGISTRATION
                     REGISTERED                     REGISTERED(1)      SHARE        PRICE            FEE
- -------------------------------------------------------------------------------------------------------------
<S>                                               <C>                <C>          <C>                <C>
Common Stock, par value $0.001
  To be issued for options
     under the 1989 Stock Option Plan.............1,060,991 shares    $ 5.71(2)   $ 6,058,259        $1,836
  To be issued for options                                              $3.59/
     under the 1996 Stock Option Plan.............1,133,921 shares     17.75(3)   $18,275,635        $5,538
  To be issued under the 1997 Employee Stock
    Purchase Plan.................................  500,000 shares    $15.09(4)   $ 7,543,750        $2,286
            TOTAL                                 2,694,912 shares                $31,877,644        $9,660
=============================================================================================================
</TABLE>
(1)  For the sole purpose of calculating the registration fee, the number of
     shares to be registered under this Registration Statement has been broken
     down into three subtotals.

(2)  Computed in accordance with Rule 457(h) under the Securities Act of 1933.
     Such computation is based on the weighted average exercise price of $5.71
     per share covering outstanding options under the 1989 Stock Option Plan to
     purchase 1,060,991 shares.

(3)  Computed in accordance with Rule 457(h) under the Securities Act of 1933.
     Such computation is based on (i) the weighted average exercise price of
     $3.59 per share covering outstanding options under the 1996 Stock Option
     Plan to purchase 130,753 shares and (ii) $17.75 per share (the average of
     the high and the low prices of the Registrant's Common Stock on September
     26, 1997) for 1,003,168 shares.

(4)  Computed in accordance with Rule 457(h) under the Securities Act of 1933.
     Such computation is based on $15.09 per share (85% of the average of the
     high and the low prices of the Registrant's Common Stock on September 26,
     1997). Pursuant to the 1997 Employee Stock Purchase Plan, shares are sold
     at 85% of the lesser of the fair market value of such shares on the first
     day of an offering period or last day of the applicable purchase period.
<PAGE>   2

                           PROBUSINESS SERVICES, INC.

                       REGISTRATION STATEMENT ON FORM S-8

                                     PART II



ITEM 3.  INCORPORATION OF DOCUMENTS BY REFERENCE.

     There are hereby incorporated by reference into this Registration Statement
the following documents and information heretofore filed by ProBusiness
Services, Inc. (the "Registrant") with the Securities and
Exchange Commission (the "Commission"):

     (1) The Registrant's Prospectus dated September 19, 1997 as filed by the
Registrant pursuant to Rule 424(b) promulgated under the Securities Act of 1933,
as amended (the "Securities Act").

     (2) The description of Registrant's Common Stock contained in the
Registrant's Registration Statement on Form 8-A filed on September 4, 1997
pursuant to Section 12(g) of the Securities Exchange Act of 1934 (the "Exchange
Act"), including any amendment or report filed for the purpose of updating such
description.

     All documents subsequently filed by the Registrant pursuant to Sections
13(a), 13(c), 14 and 15(d) of the Exchange Act, prior to the filing of a
post-effective amendment which indicates that all securities offered have been
sold or which deregisters all securities then remaining unsold, shall be deemed
to be incorporated by reference in this Registration Statement and to be part
hereof from the date of filing of such documents.

ITEM 4.  DESCRIPTION OF SECURITIES.

     Not applicable.

ITEM 5.  INTERESTS OF NAMED EXPERTS AND COUNSEL.

     As of September 30, 1997, certain members and investment partnerships of
Wilson Sonsini Goodrich & Rosati, P.C., beneficially owned an aggregate of
18,402 shares of the Company's Common Stock.

ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     Reference is made to Article Ninth of the Amended and Restated Certificate
of Incorporation of the Company filed herewith as Exhibit 4.1; Article VI of the
Bylaws of the Company filed as Exhibit 4.2 incorporated by reference; Section
145 of the Delaware General Corporation Law; and indemnification agreement
entered into between the Company and its officers and directors which, among
other things, and subject to certain conditions, authorize the Company to
indemnify, or indemnify by their terms, as the case may be, the directors and
officers of the Company against certain liabilities and expenses incurred by
such persons in connection with claims made by reason of their being such a
director or officer.

     The Company intends to obtain directors and officers insurance providing
indemnification for certain of the Company's directors, officers, affiliates,
partners or employees for certain liabilities.


<PAGE>   3

ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMED.

     Not applicable.

ITEM 8.  EXHIBITS.

<TABLE>
<CAPTION>
Exhibit 
Number                              Description
- -------  -----------------------------------------------------------------------
<S>      <C>
  4.1    Amended and Restated Certificate of Incorporation.
  4.2*   Bylaws.
  4.3*   1989 Stock Option Plan.
  4.4*   1996 Stock Option Plan.
  4.5    1997 Employee Stock Purchase Plan.
  5.1    Opinion of counsel as to legality of securities being registered.
 23.1    Consent of Ernst & Young LLP, Independent Auditors. 
 23.2    Consent of Wilson Sonsini Goodrich & Rosati, P.C. (contained in
         Exhibit 5.1).
 24.1    Power of Attorney (see page 5).
</TABLE>
- ----------
* Incorporated by reference to the Registrant's Registration Statement on Form
  S-1, as amended (No. 333-23189), which was declared effective on September 18,
  1997.

ITEM 9.   UNDERTAKINGS.

     a.      The Registrant hereby undertakes:

        i.   To file, during any period which offers or sales are being made, a
             post-effective amendment to this registration statement to include
             any material information with respect to the plan of distribution
             not previously disclosed in the registration statement or any
             material change to such information in the registration statement.

        ii.  That, for the purpose of determining any liability under the
             Securities Act, each such post-effective amendment shall be deemed
             to be a new registration statement relating to the securities
             offered therein, and the offering of such securities at that time
             shall be deemed to be the initial bona fide offering thereof.


        iii. To remove from registration by means of a post-effective amendment
             any of the securities being registered which remain unsold at the
             termination of the offering.

     b.  The Registrant hereby undertakes that, for purposes of determining any
         liability under the Securities Act, each filing of the Registrant's
         annual report pursuant to Section 13(a) or Section 15(d) of the
         Exchange Act (and, where applicable, each filing of an employee benefit
         plan's annual report pursuant to Section 15(d) of the Exchange Act)
         that is incorporated by reference in the Registration Statement shall
         be deemed to be a new registration statement relating to the securities
         offered therein, 





                                      -2-
<PAGE>   4

         and the offering of such securities at that time shall be deemed to be
         the initial bona fide offering thereof.

     c.  Insofar as indemnification for liabilities arising under the Securities
         Act may be permitted to directors, officers and controlling persons of
         the Registrant pursuant to law, the Registrant's Amended and Restated
         Certificate of Incorporation, Bylaws or indemnification agreements, or
         otherwise, the Registrant has been advised that in the opinion of the
         Securities and Exchange Commission such indemnification is against
         public policy as expressed in the Securities Act and is therefore
         unenforceable. In the event that a claim for indemnification against
         such liabilities (other than the payment by the Registrant of expenses
         incurred or paid by a director, officer or controlling person of the
         Registrant in a successful defense of any action, suit or proceeding)
         is asserted by such director, officer or controlling person in
         connection with the securities being registered hereunder, the
         Registrant will, unless in the opinion of its counsel the matter has
         been settled by controlling precedent, submit to a court of appropriate
         jurisdiction the question of whether such indemnification by it is
         against public policy as expressed in the Securities Act and will be
         governed by the final adjudication of such issue.



                                      -3-
<PAGE>   5

                                   SIGNATURES


     Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8 and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Pleasanton, State of California, on this 2nd day of
October, 1997.

                                   PROBUSINESS SERVICES, INC.


                                   By:  /s/ Thomas H. Sinton
                                      ----------------------------------------
                                      Thomas H. Sinton,
                                      President and Chief Executive Officer


<PAGE>   6



                                POWER OF ATTORNEY


     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints Thomas H. Sinton and Steven E. Klei, and
each of them, as his attorney-in-fact, with full power of substitution in each,
for him in any and all capacities to sign any amendments to this Registration
Statement on Form S-8, and to file the same, with exhibits thereto and other
documents in connection therewith, with the Securities and Exchange Commission,
hereby ratifying and confirming all that said attorney-in-fact, or his
substitutes, may do or cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Act, this registration
statement has been signed by the following persons in the capacities and on the
dates indicated.


<TABLE>
<CAPTION>
             Signature                                 Title                                  Date
- -------------------------------------    --------------------------------------       ---------------------
<S>                                      <C>                                            <C>
/s/ Thomas H. Sinton                     President, Chief Executive Officer and         October 2,  1997
- ----------------------------------       Director (Principal Executive Officer)
Thomas H. Sinton

/s/ Steven E. Klei                       Senior Vice President, Finance,                October 2, 1997
- ----------------------------------       Chief Financial Officer and Secretary
Steven E. Klei                           (Principal Financial Officer and Principal
                                         Accounting Officer)

/s/ William T. Clifford                  Director                                       October 2, 1997
- ----------------------------------       
William T. Clifford

/s/ David C. Hodgson                     Director                                       October 2, 1997
- ----------------------------------
David C. Hodgson

                                         Director                                       _________, 1997
- ----------------------------------
Ronald W. Readmond

/s/ Thomas P. Roddy                      Director                                       October 2, 1997
- ----------------------------------
Thomas P. Roddy
</TABLE>

<PAGE>   7


                                INDEX TO EXHIBITS

<TABLE>
<CAPTION>
Exhibit 
 Number                              Description
- -------  ----------------------------------------------------------------------
<S>       <C>
   4.1    Amended and Restated Certificate of Incorporation.
   4.2*   Bylaws.
   4.3*   1989 Stock Option Plan.
   4.4*   1996 Stock Option Plan.
   4.5    1997 Employee Stock Purchase Plan.
   5.1    Opinion of counsel as to legality of securities being registered.
  23.1    Consent of Ernst & Young LLP, Independent Auditors. 
  23.2    Consent of Wilson Sonsini Goodrich & Rosati, P.C. (contained in
          Exhibit 5.1).
  24.1    Power of Attorney (see page 5).
</TABLE>
- ----------
* Incorporated by reference to the Registrant's Registration Statement on Form
  S-1, as amended (No. 333-23189), which was declared effective on September 18,
  1997.



<PAGE>   1
                                                                     EXHIBIT 4.1


                              AMENDED AND RESTATED

                          CERTIFICATE OF INCORPORATION

                                       OF

                           PROBUSINESS SERVICES, INC.


         FIRST: The name of the corporation is ProBusiness Services, Inc. (the
"Corporation").

         SECOND: The address of the Corporation's registered office in the State
of Delaware is Corporation Trust Center, 1209 Orange Street, in the City of
Wilmington, County of New Castle, Delaware 19801. The name of its registered
agent at such address is The Corporation Trust Company.

         THIRD: The nature of the business or purposes to be conducted or
promoted by the Corporation is to engage in any lawful act or activity for which
corporations may be organized under the General Corporation Law of Delaware.

         FOURTH: This Corporation is authorized to issue two classes of shares
to be designated, respectively, Common Stock and Preferred Stock. The total
number of shares of capital stock that the Corporation is authorized to issue is
sixty-five million (65,000,000). The total number of shares of Common Stock this
corporation shall have authority to issue is sixty million (60,000,000), $0.001
par value, and the total number of shares of Preferred Stock this corporation
shall have authority to issue is five million (5,000,000), $0.00l par value. The
undesignated Preferred Stock may be issued from time to time in one or more
series pursuant to a resolution or resolutions providing for such issue duly
adopted by the Board of Directors (authority to do so being hereby expressly
vested in the Board). The Board of Directors is further authorized to determine
or alter the rights, preferences, privileges, and restrictions granted to or
imposed upon any wholly unissued series of Preferred Stock and to fix the number
of shares of any series of Preferred Stock and the designation of any such
series of Preferred Stock. The Board of Directors within the limits and
restrictions stated in any resolution or resolutions of the Board of Directors
originally fixing the number of shares constituting any series of Preferred
Stock, may increase or decrease (but not below the number of shares of any such
series then outstanding) the number of shares of any such series subsequent to
the issue of shares of that series.

         FIFTH: "Qualified Public Offering" as used in this Certificate of
Incorporation shall mean the Corporation's initial firm commitment underwritten
public offering pursuant to an effective registration under the Securities Act
of 1933, as amended, covering the offer and sale of Common Stock for the account
of the Corporation to the public. For the management of the business and for the
conduct of the affairs of the Corporation, and in further definition, limitation
and
<PAGE>   2
regulation of the powers of the Corporation, of its directors and of its
stockholders or any class thereof, as the case may be, it is further provided
that the following provisions shall become effective (a) upon the closing of a
Qualified Public Offering, and (b) to the extent not permitted by California
law, at such time as the securities of the Corporation are (i) listed on the New
York Stock Exchange or the American Stock Exchange or (ii) designated as
qualified for trading as a national market security on the National Association
of Securities Dealers Automatic Quotation System (or any successor national
market system) if the Corporation has a least 800 holders of its equity
securities as of the record date of its most recent annual meeting of
stockholders:

         1. The management of the business and the conduct of the affairs of the
Corporation shall be vested in its Board of Directors. The number of directors
which shall constitute the whole Board of Directors shall be fixed exclusively
by one or more resolutions adopted from time to time by the Board of Directors.

         The Board of Directors shall be divided into three classes designated
as Class I, Class II and Class III, respectively. Directors shall be assigned to
each class in accordance with a resolution or resolutions adopted by the Board
of Directors. At the first annual meeting of stockholders following the date
hereof, the term of office of the Class I directors shall expire and Class I
directors shall be elected for a full term of three years. At the second annual
meeting of stockholders following the date hereof, the term of office of the
Class II directors shall expire and Class II directors shall be elected for a
full term of three years. At the third annual meeting of stockholders following
the date hereof, the term of office of the Class III directors shall expire and
Class III directors shall be elected for a full term of three years. At each
succeeding annual meeting of stockholders, directors shall be elected for a full
term of three years to succeed the directors of the class whose terms expire at
such annual meeting.

         Notwithstanding the foregoing provisions of this Article, each director
shall serve until his or her successor is duly elected and qualified or until
his or her death, resignation or removal. No decrease in the number of directors
constituting the Board of Directors shall shorten the term of any incumbent
director.

         Any vacancies on the Board of Directors resulting from death,
resignation, disqualification, removal, or other causes unless the Board of
Directors determines by resolution that any such vacancies or newly created
directorships shall be filled by stockholders, except as otherwise provided by
law, be filled only by the affirmative vote of a majority of the remaining
directors then in office, even though less than a quorum of the Board of
Directors and not by the stockholders. Newly created directorships resulting
from any increase in the number of directors shall, unless the Board of
Directors determines by resolution that any such newly created directorship
shall be filled by the stockholders, be filled only by the affirmative vote of
the directors then in office, even though less than a quorum of the Board of
Directors and not by the stockholders. Any director elected in accordance with
the preceding sentence shall hold office for the remainder of the full term of
the class of directors in which the new directorship was created or the vacancy
occurred and until such director's successor shall have been elected and
qualified.



                                       -2-
<PAGE>   3
         2. In furtherance and not in limitation of the powers conferred by
statute, the Board of Directors is expressly authorized to make, alter, amend,
or repeal the Bylaws of the Corporation.

         3. The directors of the Corporation need not be elected by written
ballot unless a stockholder demands election by written ballot at the meeting
and before voting begins, or unless the Bylaws so provide.

         4. No action shall be taken by the stockholders of the Corporation
except at an annual or special meeting of the stockholders called in accordance
with the Bylaws and no action shall be taken by the stockholders by written
consent.

         5. Advance notice of stockholder nomination for the election of
directors and of business to be brought by stockholders before any meeting of
the stockholders of the Corporation shall be given in the manner provided in the
Bylaws of the Corporation.

         6. Special meetings of the stockholders of the Corporation may be
called, for any purpose or purposes, by (i) the Chairman of the Board of
Directors, (ii) the President, (iii) the Chief Executive Officer, (iv) the Board
of Directors or (v) the holders of shares entitled to cast not less than forty
percent (40%) of the votes at the meeting, and shall be held at such place, on
such date, and at such time as the Board of Directors shall fix.

         SIXTH: Meetings of stockholders may be held within or without the State
of Delaware, as the Bylaws may provide. The books of the Corporation may be kept
(subject to any provision contained in the statutes) outside of the State of
Delaware at such place or places as may be designated from time to time by the
Board of Directors or in the Bylaws of the Corporation.

         SEVENTH: The Corporation reserves the right to amend, alter, change or
repeal any provision contained in this Certificate of Incorporation, in the
manner now or hereafter prescribed by statute, and all rights conferred upon the
stockholders herein are granted subject to this right.

         EIGHTH: Notwithstanding any other provisions of this Certificate of
Incorporation or any provision of law which might otherwise permit a lesser vote
or no vote, but in addition to any affirmative vote of the holders of any
particular class or series of the voting stock required by law, this Certificate
of Incorporation or any Certificate of Designation, the affirmative vote of the
holders of at least sixty-six and two-thirds percent (66-2/3%) of the voting
power of all of the then-outstanding shares of the voting stock, voting together
as a single class, shall be required to alter, amend or repeal Article Fifth or
this Article Eighth.

         NINTH: The liability of the directors of the Corporation for monetary
damages shall be eliminated to the fullest extent permissible under Delaware
law.

         A director of the corporation shall not be personally liable to the
Corporation or its stockholders for monetary damages for any breach of fiduciary
duty as a director, except for liability


                                       -3-
<PAGE>   4
(i) for any breach of the director's duty of loyalty to the Corporation or its
stockholders, (ii) for acts or omissions not in good faith or which involve
intentional misconduct or a knowing violation of law, (iii) under Section 174 of
the Delaware General Corporation Law, or (iv) for any transaction from which the
director derived an improper personal benefit. If the Delaware General
Corporation Law is amended after approval by the stockholders of this Article to
authorize corporate action further eliminating or limiting the personal
liability of directors, then the liability of a director shall be eliminated or
limited to the fullest extent permitted by the Delaware General Corporation Law,
as so amended.

         Any repeal or modification of this Article Ninth shall be prospective
and shall not affect the rights under this Article Ninth in effect at the time
of the alleged occurrence of any act or omission to act giving rise to liability
or indemnification.

                                       -4-

<PAGE>   1
                                                                    EXHIBIT 4.5


                           PROBUSINESS SERVICES, INC.

                        1997 EMPLOYEE STOCK PURCHASE PLAN
                            (As Amended August 1997)


         The following constitute the provisions of the 1997 Employee Stock
Purchase Plan of ProBusiness Services, Inc., a Delaware corporation.

         1. Purpose. The purpose of the Plan is to provide employees of the
Company and its Designated Subsidiaries with an opportunity to purchase Common
Stock of the Company through accumulated payroll deductions. It is the intention
of the Company to have the Plan qualify as an "Employee Stock Purchase Plan"
under Section 423 of the Internal Revenue Code of 1986, as amended. The
provisions of the Plan, accordingly, shall be construed so as to extend and
limit participation in a manner consistent with the requirements of that section
of the Code.

         2. Definitions.

                  (a) "Board" shall mean the Board of Directors of the Company.

                  (b) "Code" shall mean the Internal Revenue Code of 1986, as
amended.

                  (c) "Common Stock" shall mean the Common Stock of the Company.

                  (d) "Company" shall mean ProBusiness Services, Inc. and any
Designated Subsidiary of the Company.

                  (e) "Compensation" shall mean all base straight time gross
earnings and commissions, and shall include payments for overtime, shift
premium, incentive compensation, incentive payments, bonuses and other
compensation; provided, however, that pursuant to Section 20 the Board may
modify the definition of "Compensation" before any Offering Period without
shareholder approval if such change is announced at least five (5) days prior to
the scheduled beginning of the first Offering Period for which the modification
shall have effect.

                  (f) "Designated Subsidiary" shall mean any Subsidiary which
has been designated by the Board from time to time in its sole discretion as
eligible to participate in the Plan.

                  (g) "Employee" shall mean any individual who is an Employee of
the Company for tax purposes whose customary employment with the Company is at
least twenty (20) hours per week and more than five (5) months in any calendar
year. For purposes of the Plan, the employment relationship shall be treated as
continuing intact while the individual is on sick leave or other leave of
absence approved by the Company. Where the period of leave exceeds 90 days and
the individual's right to reemployment is not guaranteed either by statute or by
contract, the employment relationship shall be deemed to have terminated on the
91st day of such leave.

                  (h) "Enrollment Date" shall mean the first day of each
Offering Period.
<PAGE>   2
                  (i) "Exercise Date" shall mean the last day of each Purchase
Period.


                  (j) "Fair Market Value" shall mean, as of any date, the value
of Common Stock determined as follows:

                           (1) If the Common Stock is listed on any established
stock exchange or a national market system, including without limitation the
Nasdaq National Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market,
its Fair Market Value shall be the closing sales price for such stock (or the
closing bid, if no sales were reported) as quoted on such exchange or system for
the last market trading day prior to the time of determination, as reported in
The Wall Street Journal or such other source as the Administrator deems
reliable, or;

                           (2) If the Common Stock is regularly quoted by a
recognized securities dealer but selling prices are not reported, its Fair
Market Value shall be the mean of the closing bid and asked prices for the
Common Stock on the date of such determination, as reported in The Wall Street
Journal or such other source as the Board deems reliable, or;

                           (3) In the absence of an established market for the
Common Stock, the Fair Market Value thereof shall be determined in good faith by
the Board, or;

                           (4) For purposes of the Enrollment Date of the first
Offering Period under the Plan, the Fair Market Value shall be the initial price
to the public as set forth in the final prospectus included within the
registration statement in Form S-1 filed with the Securities and Exchange
Commission for the initial public offering of the Company's Common Stock (the
"Registration Statement").

                  (k) "Offering Periods" shall mean the periods of approximately
twenty-four (24) months during which an option granted pursuant to the Plan may
be exercised, commencing on the first Trading Day on or after May 16 and
November 16 of each year and terminating on the last Trading Day in the periods
ending twenty-four months later; provided, however, that the first Offering
Period under the Plan shall commence on the first Trading Day on or after the
date on which the Securities and Exchange Commission declares the Company's
Registration Statement effective and shall end on the last Trading Day on or
before November 15, 1999, and the second Offering Period under the Plan shall
commence on the first Trading Day on or after May 16, 1998 and shall end on the
last Trading Day on or before May 15, 2000. The duration and timing of Offering
Periods may be changed pursuant to Section 4 of this Plan.

                  (l) "Plan" shall mean this 1997 Employee Stock Purchase Plan.

                  (m) "Purchase Price" shall mean an amount equal to 85% of the
Fair Market Value of a share of Common Stock on the Enrollment Date or on the
Exercise Date, whichever is lower.

                  (n) "Purchase Period" shall mean the approximately six-month
period commencing after one Exercise Date and ending with the next Exercise
Date, except that the first 


                                       -2-
<PAGE>   3
Purchase Period of any Offering Period shall commence on the Enrollment Date and
end with the next Exercise Date. The first Purchase Period under the Plan shall
commence on the first Trading Day on or after which the Securities and Exchange
Commission declares the Company's Registration Statement effective and shall end
on the last Trading Day on or before May 15, 1998.

                  (o) "Reserves" shall mean the number of shares of Common Stock
covered by each option under the Plan which have not yet been exercised and the
number of shares of Common Stock which have been authorized for issuance under
the Plan but not yet placed under option.

                  (p) "Subsidiary" shall mean a corporation, domestic or
foreign, of which not less than 50% of the voting shares are held by the Company
or a Subsidiary, whether or not such corporation now exists or is hereafter
organized or acquired by the Company or a Subsidiary.

                  (q) "Trading Day" shall mean a day on which national stock
exchanges and the Nasdaq System are open for trading.

         3. Eligibility.

                  (a) Any Employee who is employed by the Company on the first
Trading Day of May or November, as applicable, prior to a given Enrollment Date
shall be eligible to participate in the Plan; provided, however, that any
Employee who is employed by the Company prior to the first day of the first
Offering Period shall be eligible to participate in the Plan.

                  (b) Any provisions of the Plan to the contrary
notwithstanding, no Employee shall be granted an option under the Plan (i) to
the extent that, immediately after the grant, such Employee (or any other person
whose stock would be attributed to such Employee pursuant to Section 424(d) of
the Code) would own capital stock of the Company and/or hold outstanding options
to purchase such stock possessing five percent (5%) or more of the total
combined voting power or value of all classes of the capital stock of the
Company or of any Subsidiary, or (ii) to the extent that his or her rights to
purchase stock under all employee stock purchase plans of the Company and its
subsidiaries accrues at a rate which exceeds Twenty-Five Thousand Dollars
($25,000) worth of stock (determined at the fair market value of the shares at
the time such option is granted) for each calendar year in which such option is
outstanding at any time.

         4. Offering Periods. The Plan shall be implemented by consecutive,
overlapping Offering Periods with a new Offering Period commencing on the first
Trading Day on or after May 16 and November 16 each year, or on such other date
as the Board shall determine, and continuing thereafter until terminated in
accordance with Section 20 hereof; provided, however, that the first Offering
Period under the Plan shall commence with the first Trading Day on or after the
date on which the Securities and Exchange Commission declares the Company's
Registration Statement effective and ending on the last Trading Day on or before
November 15, 1999; and the second Offering Period shall commence on the last
Trading Day on or after May 16, 1998, and shall end on the last Trading Day on
or before May 15, 2000. The Board shall have the power to change the duration of
Offering Periods (including the commencement dates thereof) with respect to
future offerings without shareholder approval if such change is announced at
least five (5) days prior to the scheduled beginning of the first Offering
Period to be affected thereafter.


                                       -3-
<PAGE>   4
         5. Participation.

                  (a) An eligible Employee may become a participant in the Plan
by completing a subscription agreement authorizing payroll deductions in the
form of Exhibit A to this Plan and filing it with the Company's payroll office
prior to the applicable Enrollment Date.

                  (b) Payroll deductions for a participant shall commence on the
first payroll following the Enrollment Date and shall end on the last payroll in
the Offering Period to which such authorization is applicable, unless sooner
terminated by the participant as provided in Section 10 hereof.

         6. Payroll Deductions.

                  (a) At the time a participant files his or her subscription
agreement, he or she shall elect to have payroll deductions made on each pay day
during the Offering Period in an amount not exceeding ten  percent (10%) of
the Compensation which he or she receives on each pay day during the Offering
Period.

                  (b) All payroll deductions made for a participant shall be
credited to his or her account under the Plan and shall be withheld in whole
percentages only. A participant may not make any additional payments into such
account.

                  (c) A participant may discontinue his or her participation in
the Plan as provided in Section 10 hereof, or may decrease the rate of his or
her payroll deductions to 0% during a Purchase Period by filing with the Company
a new subscription agreement authorizing the reduction. The change in rate shall
be effective with the first full payroll period following five (5) business days
after the Company's receipt of the new subscription agreement unless the Company
elects to process a given change in participation more quickly. A participant
may increase or decrease the rate of his or her payroll deductions as of the
first day of a successive Purchase Period by filing with the Company a new
subscription agreement authorizing the change prior to the first day of the
successive Purchase Period. A participant's subscription agreement shall remain
in effect for successive Offering Periods unless terminated as provided in
Section 10 hereof.

                  (d) Notwithstanding the foregoing, to the extent necessary to
comply with Section 423(b)(8) of the Code and Section 3(b) hereof, a
participant's payroll deductions may be decreased to zero percent (0%) at any
time during a Purchase Period. Payroll deductions shall recommence at the rate
provided in such participant's subscription agreement at the beginning of the
first Purchase Period which is scheduled to end in the following calendar year,
unless terminated by the participant as provided in Section 10 hereof.

                  (e) At the time the option is exercised, in whole or in part,
or at the time some or all of the Company's Common Stock issued under the Plan
is disposed of, the participant must make adequate provision for the Company's
federal, state, or other tax withholding obligations, if any, 


                                       -4-
<PAGE>   5
which arise upon the exercise of the option or the disposition of the Common
Stock. At any time, the Company may, but shall not be obligated to, withhold
from the participant's compensation the amount necessary for the Company to meet
applicable withholding obligations, including any withholding required to make
available to the Company any tax deductions or benefits attributable to sale or
early disposition of Common Stock by the Employee.

         7. Grant of Option. On the Enrollment Date of each Offering Period,
each eligible Employee participating in such Offering Period shall be granted an
option to purchase on each Exercise Date during such Offering Period (at the
applicable Purchase Price) up to a number of shares of the Company's Common
Stock determined by dividing such Employee's payroll deductions accumulated
prior to such Exercise Date and retained in the Participant's account as of the
Exercise Date by the applicable Purchase Price; provided that in no event shall
an Employee be permitted to purchase during each Purchase Period more than 2,500
shares of the Company's Common Stock (subject to any adjustment pursuant to
Section 19) on the Enrollment Date, and provided further that such purchase
shall be subject to the limitations set forth in Sections 3(b) and 12 hereof.
Exercise of the option shall occur as provided in Section 8 hereof, unless the
participant has withdrawn pursuant to Section 10 hereof. The option shall expire
on the last day of the Offering Period.

         8. Exercise of Option. Unless a participant withdraws from the Plan as
provided in Section 10 hereof, his or her option for the purchase of shares
shall be exercised automatically on the Exercise Date, and the maximum number of
full shares subject to option shall be purchased for such participant at the
applicable Purchase Price with the accumulated payroll deductions in his or her
account. No fractional shares shall be purchased; any payroll deductions
accumulated in a participant's account which are not sufficient to purchase a
full share shall be retained in the participant's account for the subsequent
Purchase Period or Offering Period, subject to earlier withdrawal by the
participant as provided in Section 10 hereof. Any other monies left over in a
participant's account after the Exercise Date shall be returned to the
participant. During a participant's lifetime, a participant's option to purchase
shares hereunder is exercisable only by him or her.

         9. Delivery. As promptly as practicable after each Exercise Date on
which a purchase of shares occurs, the Company shall arrange the delivery to
each participant, as appropriate, of a certificate representing the shares
purchased upon exercise of his or her option.

         10. Withdrawal.

                  (a) A participant may withdraw all but not less than all the
payroll deductions credited to his or her account and not yet used to exercise
his or her option under the Plan at any time by giving written notice to the
Company in the form of Exhibit B to this Plan. All of the participant's payroll
deductions credited to his or her account shall be paid to such participant
promptly after receipt of notice of withdrawal and such participant's option for
the Offering Period shall be automatically terminated, and no further payroll
deductions for the purchase of shares shall 


                                       -5-
<PAGE>   6
be made for such Offering Period. If a participant withdraws from an Offering
Period, payroll deductions shallnot resume at the beginning of the succeeding
Offering Period unless the participant delivers to the Company a new
subscription agreement.

                  (b) A participant's withdrawal from an Offering Period shall
not have any effect upon his or her eligibility to participate in any similar
plan which may hereafter be adopted by the Company or in succeeding Offering
Periods which commence after the termination of the Offering Period from which
the participant withdraws.

         11. Termination of Employment.

                  Upon a participant's ceasing to be an Employee, for any
reason, he or she shall be deemed to have elected to withdraw from the Plan and
the payroll deductions credited to such participant's account during the
Offering Period but not yet used to exercise the option shall be returned to
such participant or, in the case of his or her death, to the person or persons
entitled thereto under Section 15 hereof, and such participant's option shall be
automatically terminated. The preceding sentence notwithstanding, a participant
who receives payment in lieu of notice of termination of employment shall be
treated as continuing to be an Employee for the participant's customary number
of hours per week of employment during the period in which the participant is
subject to such payment in lieu of notice.

         12. Interest. No interest shall accrue on the payroll deductions of a
participant in the Plan.

         13. Stock.

                  (a) The maximum number of shares of the Company's Common Stock
which shall be made available for sale under the Plan shall be Five Hundred
Thousand (500,000) shares, subject to adjustment upon changes in capitalization
of the Company as provided in Section 19 hereof, plus an annual increase to be
added on each anniversary date of the adoption of the Plan equal to the lesser
of (i) 150,000 Shares, (ii) one and one-half percent (1.5%) of the outstanding
Shares on such date or (iii) a lesser number determined by the Board. If, on a
given Exercise Date, the number of shares with respect to which options are to
be exercised exceeds the number of shares then available under the Plan, the
Company shall make a pro rata allocation of the shares remaining available for
purchase in as uniform a manner as shall be practicable and as it shall
determine to be equitable.

                  (b) The participant shall have no interest or voting right in
shares covered by his option until such option has been exercised.

                  (c) Shares to be delivered to a participant under the Plan
shall be registered in the name of the participant or in the name of the
participant and his or her spouse.


                                       -6-
<PAGE>   7



         14. Administration. The Plan shall be administered by the Board or a
committee of members of the Board appointed by the Board. The Board or its
committee shall have full and exclusive discretionary authority to construe,
interpret and apply the terms of the Plan, to determine eligibility and to
adjudicate all disputed claims filed under the Plan. Every finding, decision and
determination made by the Board or its committee shall, to the full extent
permitted by law, be final and binding upon all parties.

         15. Designation of Beneficiary.

                  (a) A participant may file a written designation of a
beneficiary who is to receive any shares and cash, if any, from the
participant's account under the Plan in the event of such participant's death
subsequent to an Exercise Date on which the option is exercised but prior to
delivery to such participant of such shares and cash. In addition, a participant
may file a written designation of a beneficiary who is to receive any cash from
the participant's account under the Plan in the event of such participant's
death prior to exercise of the option. If a participant is married and the
designated beneficiary is not the spouse, spousal consent shall be required for
such designation to be effective.

                  (b) Such designation of beneficiary may be changed by the
participant at any time by written notice. In the event of the death of a
participant and in the absence of a beneficiary validly designated under the
Plan who is living at the time of such participant's death, the Company shall
deliver such shares and/or cash to the executor or administrator of the estate
of the participant, or if no such executor or administrator has been appointed
(to the knowledge of the Company), the Company, in its discretion, may deliver
such shares and/or cash to the spouse or to any one or more dependents or
relatives of the participant, or if no spouse, dependent or relative is known to
the Company, then to such other person as the Company may designate.

         16. Transferability. Neither payroll deductions credited to a
participant's account nor any rights with regard to the exercise of an option or
to receive shares under the Plan may be assigned, transferred, pledged or
otherwise disposed of in any way (other than by will, the laws of descent and
distribution or as provided in Section 15 hereof) by the participant. Any such
attempt at assignment, transfer, pledge or other disposition shall be without
effect, except that the Company may treat such act as an election to withdraw
funds from an Offering Period in accordance with Section 10 hereof.

         17. Use of Funds. All payroll deductions received or held by the
Company under the Plan may be used by the Company for any corporate purpose, and
the Company shall not be obligated to segregate such payroll deductions.

         18. Reports. Individual accounts shall be maintained for each
participant in the Plan. Statements of account shall be given to participating
Employees at least annually, which statements shall set forth the amounts of
payroll deductions, the Purchase Price, the number of shares purchased and the
remaining cash balance, if any.



                                       -7-
<PAGE>   8
         19. Adjustments Upon Changes in Capitalization, Dissolution,
             Liquidation, Merger or Asset Sale.

                  (a) Changes in Capitalization. Subject to any required action
by the shareholders of the Company, the Reserves, the maximum number of shares
each participant may purchase each Purchase Period (pursuant to Section 7), as
well as the price per share and the number of shares of Common Stock covered by
each option under the Plan which has not yet been exercised shall be
proportionately adjusted for any increase or decrease in the number of issued
shares of Common Stock resulting from a stock split, reverse stock split, stock
dividend, combination or reclassification of the Common Stock, or any other
increase or decrease in the number of shares of Common Stock effected without
receipt of consideration by the Company; provided, however, that conversion of
any convertible securities of the Company shall not be deemed to have been
"effected without receipt of consideration". Such adjustment shall be made by
the Board, whose determination in that respect shall be final, binding and
conclusive. Except as expressly provided herein, no issuance by the Company of
shares of stock of any class, or securities convertible into shares of stock of
any class, shall affect, and no adjustment by reason thereof shall be made with
respect to, the number or price of shares of Common Stock subject to an option.

                  (b) Dissolution or Liquidation. In the event of the proposed
dissolution or liquidation of the Company, the Offering Periods shall terminate
immediately prior to the consummation of such proposed action, unless otherwise
provided by the Board.

                  (c) Merger or Asset Sale. In the event of a proposed sale of
all or substantially all of the assets of the Company, or the merger of the
Company with or into another corporation, each outstanding option shall be
assumed or an equivalent option substituted by the successor corporation or a
Parent or Subsidiary of the successor corporation. In the event that the
successor corporation refuses to assume or substitute for the option, any
Purchase Periods then in progress shall be shortened by setting a new Exercise
Date (the "New Exercise Date") and any Offering Periods then in progress shall
end on the New Exercise Date. The New Exercise Date shall be before the date of
the Company's proposed sale or merger. The Board shall notify each participant
in writing, at least ten (10) business days prior to the New Exercise Date, that
the Exercise Date for the participant's option has been changed to the New
Exercise Date and that the participant's option shall be exercised automatically
on the New Exercise Date, unless prior to such date the participant has
withdrawn from the Offering Period as provided in Section 10 hereof.

         20. Amendment or Termination.

                  (a) The Board of Directors of the Company may at any time and
for any reason terminate or amend the Plan. Except as provided in Section 19
hereof, no such termination can affect options previously granted, provided that
an Offering Period may be terminated by the Board of Directors on any Exercise
Date if the Board determines that the termination of the Plan is in the best
interests of the Company and its shareholders. Except as provided in Section 19
hereof, no amendment may make any change in any option theretofore granted which
adversely affects the rights of any participant. To the extent necessary to
comply with Section 423 of the Code (or any 


                                       -8-
<PAGE>   9
successor rule or provision or any other applicable law, regulation or stock
exchange rule), the Company shall obtain shareholder approval in such a manner
and to such a degree as required.

                  (b) Without shareholder consent and without regard to whether
any participant rights may be considered to have been "adversely affected," the
Board (or its committee) shall be entitled to change the Offering Periods, limit
the frequency and/or number of changes in the amount withheld during an Offering
Period, establish the exchange ratio applicable to amounts withheld in a
currency other than U.S. dollars, permit payroll withholding in excess of the
amount designated by a participant in order to adjust for delays or mistakes in
the Company's processing of properly completed withholding elections, establish
reasonable waiting and adjustment periods and/or accounting and crediting
procedures to ensure that amounts applied toward the purchase of Common Stock
for each participant properly correspond with amounts withheld from the
participant's Compensation, and establish such other limitations or procedures
as the Board (or its committee) determines in its sole discretion advisable
which are consistent with the Plan.

         21. Notices. All notices or other communications by a participant to
the Company under or in connection with the Plan shall be deemed to have been
duly given when received in the form specified by the Company at the location,
or by the person, designated by the Company for the receipt thereof.

         22. Conditions Upon Issuance of Shares. Shares shall not be issued with
respect to an option unless the exercise of such option and the issuance and
delivery of such shares pursuant thereto shall comply with all applicable
provisions of law, domestic or foreign, including, without limitation, the
Securities Act of 1933, as amended, the Securities Exchange Act of 1934, as
amended, the rules and regulations promulgated thereunder, and the requirements
of any stock exchange upon which the shares may then be listed, and shall be
further subject to the approval of counsel for the Company with respect to such
compliance.

                  As a condition to the exercise of an option, the Company may
require the person exercising such option to represent and warrant at the time
of any such exercise that the shares are being purchased only for investment and
without any present intention to sell or distribute such shares if, in the
opinion of counsel for the Company, such a representation is required by any of
the aforementioned applicable provisions of law.

         23. Term of Plan. The Plan shall become effective upon the earlier to
occur of its adoption by the Board of Directors or its approval by the
shareholders of the Company. It shall continue in effect for a term of ten (10)
years unless sooner terminated under Section 20 hereof.

         24. Automatic Transfer to Low Price Offering Period. To the extent
permitted by any applicable laws, regulations, or stock exchange rules if the
Fair Market Value of the Common Stock on any Exercise Date in an Offering Period
is lower than the Fair Market Value of the Common Stock on the Enrollment Date
of such Offering Period, then all participants in such Offering Period 


                                       -9-
<PAGE>   10
shall be automatically withdrawn from such Offering Period immediately after the
exercise of their option on such Exercise Date and automatically re-enrolled in
the immediately following Offering Period as of the first day thereof.


                                      -10-
<PAGE>   11
                                    EXHIBIT A


                           PROBUSINESS SERVICES, INC.

                        1997 EMPLOYEE STOCK PURCHASE PLAN

                             SUBSCRIPTION AGREEMENT



_____ Original Application                          Enrollment Date: ___________
_____ Change in Payroll Deduction Rate
_____ Change of Beneficiary(ies)


1.       ________________________ hereby elects to participate in the
         ProBusiness Services, Inc. 1997 Employee Stock Purchase Plan (the
         "Employee Stock Purchase Plan") and sub scribes to purchase shares of
         the Company's Common Stock in accordance with this Sub scription
         Agreement and the Employee Stock Purchase Plan.

2.       I hereby authorize payroll deductions from each paycheck in the amount
         of ____% of my Compensation on each payday (up to 10%) during the
         Offering Period in accordance with the Employee Stock Purchase Plan.
         (Please note that no fractional percentages are permitted.)

3.       I understand that said payroll deductions shall be accumulated for the
         purchase of shares of Common Stock at the applicable Purchase Price
         determined in accordance with the Employee Stock Purchase Plan. I
         understand that if I do not withdraw from an Offering Period, any
         accumulated payroll deductions will be used to automatically exercise
         my option.

4.       I have received a copy of the complete Employee Stock Purchase Plan. I
         understand that my participation in the Employee Stock Purchase Plan is
         in all respects subject to the terms of the Plan. I understand that my
         ability to exercise the option under this Subscription Agreement is
         subject to shareholder approval of the Employee Stock Purchase Plan.

5.       Shares purchased for me under the Employee Stock Purchase Plan should
         be issued in the name(s) of (Employee or Employee and Spouse
         only):________________________ .

6.       I understand that if I dispose of any shares received by me pursuant to
         the Plan within 2 years after the Enrollment Date (the first day of the
         Offering Period during which I purchased such shares) or one year after
         the Exercise Date, I will be treated for federal income tax purposes as
         having received ordinary income at the time of such disposition in an
         amount equal to the excess of the fair market value of the shares at
         the time such shares were purchased by me 
<PAGE>   12
         over the price which I paid for the shares. I hereby agree to notify
         the Company in writing within 30 days after the date of any disposition
         of my shares and I will make adequate provision for Federal, state or
         other tax withholding obligations, if any, which arise upon the
         disposition of the Common Stock. The Company may, but will not be
         obligated to, withhold from my compensation the amount necessary to
         meet any applicable withholding obligation including any withholding
         necessary to make available to the Company any tax deductions or
         benefits attributable to sale or early disposition of Common Stock by
         me. If I dispose of such shares at any time after the expiration of the
         2-year and 1-year holding periods, I understand that I will be treated
         for federal income tax purposes as having received income only at the
         time of such disposition, and that such income will be taxed as
         ordinary income only to the extent of an amount equal to the lesser of
         (1) the excess of the fair market value of the shares at the time of
         such disposition over the purchase price which I paid for the shares,
         or (2) 15% of the fair market value of the shares on the first day of
         the Offering Period. The remainder of the gain, if any, recognized on
         such disposition will be taxed as capital gain.

7.       I hereby agree to be bound by the terms of the Employee Stock Purchase
         Plan. The effectiveness of this Subscription Agreement is dependent
         upon my eligibility to participate in the Employee Stock Purchase Plan.

8.       In the event of my death, I hereby designate the following as my
         beneficiary(ies) to receive all payments and shares due me under the
         Employee Stock Purchase Plan:



         NAME: (Please print)    ______________________________________________
                                  (First)         (Middle)               (Last)


         _______________________________    Address:
         Relationship

                                            ___________________________________
                                            ___________________________________


                                       -2-
<PAGE>   13
Employee's Social
Security Number:                            ___________________________________


Employee's Address:                         ___________________________________
                                            ___________________________________
                                            ___________________________________


I UNDERSTAND THAT THIS SUBSCRIPTION AGREEMENT SHALL REMAIN IN EFFECT THROUGHOUT
SUCCESSIVE OFFERING PERIODS UNLESS TERMINATED BY ME.



Dated:_________________________       _________________________________________
                                      Signature of Employee


                                      _________________________________________
                                      Spouse's Signature (If beneficiary other
                                      than spouse)


                                       -3-
<PAGE>   14
                                    EXHIBIT B


                           PROBUSINESS SERVICES, INC.

                        1996 EMPLOYEE STOCK PURCHASE PLAN

                              NOTICE OF WITHDRAWAL



         The undersigned participant in the Offering Period of the ProBusiness
Services, Inc. 1996 Employee Stock Purchase Plan that began on
_________________, 19____ hereby notifies the Company that he or she hereby
withdraws from the Offering Period. He or she hereby directs the Company to pay
to the undersigned as promptly as practicable all the payroll deductions
credited to his or her account with respect to such Offering Period. The
undersigned understands and agrees that his or her option for such Offering
Period will be automatically terminated. The undersigned under stands that no
further payroll deductions will be made for the purchase of shares in the
current Offering Period and the undersigned shall be eligible to participate in
succeeding Offering Periods only by delivering to the Company a new Subscription
Agreement.

                                       Name and Address of Participant:

                                       ________________________________


                                       ________________________________


                                       ________________________________


                                       Signature:


                                       ________________________________


                                       Date:__________________________

<PAGE>   1
                                                                    EXHIBIT 5.1



                               October 3, 1997



ProBusiness Services, Inc.
5934 Gibraltar Drive
Pleasanton, California 94588

Re:  REGISTRATION STATEMENT ON FORM S-8

Ladies and Gentlemen:

     We have examined the Registration Statement on Form S-8 to be filed by you
with the Securities and Exchange Commission on or about October 3, 1997 (the
"Registration Statement"), in connection with the registration under the
Securities Act of 1933, as amended, of an aggregate of 2,694,912 shares of
Common Stock, par value $0.001 (the "Shares"), reserved for issuance pursuant
to the 1989 Stock Option Plan, the 1996 Stock Option Plan and the 1997 Employee
Stock Purchase Plan (together, the "Plans"). As your legal counsel, we have
examined the proceedings taken and are familiar with the proceedings proposed
to be taken by you in connection with the sale and issuance of the shares under
the Plans.

     It is our opinion that the Shares will be, when issued and sold in the
manner referred to in the Plans, legally and validly issued, fully paid and
nonassessable.

     We consent to the use of this opinion as an exhibit to the Registration
Statement and further consent to the use of our name wherever appearing in the
Registration Statement and any subsequent amendment thereto.

                                            Very truly yours,

                                            WILSON SONSINI GOODRICH & ROSATI
                                            Professional Corporation


                                            /s/ Wilson Sonsini Goodrich & Rosati

<PAGE>   1



                                                                    EXHIBIT 23.1

              CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS


We consent to the incorporation by reference in the Registration Statement
(Form S-8) pertaining to the 1989 Stock Option Plan, 1996 Stock Option Plan and
1997 Employee Stock Purchase Plan, of our reports with respect to the
consolidated financial statements of ProBusiness Services, Inc., dated August
1, 1997 except Note 11, as to which the date is August 11, 1997, Dimension
Solutions, Inc., dated November 20, 1996 and BeneSphere Administrators, Inc.,
dated December 20, 1996 included in the Registration Statement (Form S-1) and
related Prospectus and the related financial statement schedules included
therein, filed with the Securities and Exchange Commission.

/s/ Ernst & Young LLP
- -----------------------------------
ERNST & YOUNG LLP
Walnut Creek, California
October 2, 1997







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