PRINCIPAL INVESTORS FUND, INC.
                              AMENDED AND RESTATED
                         DISTRIBUTION PLAN AND AGREEMENT
                              ADVISORS SELECT CLASS


      DISTRIBUTION PLAN AND AGREEMENT made as of September 11, 2006, by and
between PRINCIPAL INVESTORS FUND, INC., a Maryland corporation (the "Fund"), and
PRINCOR FINANCIAL SERVICES CORPORATION, an Iowa corporation (the "Underwriter").

1.    This Distribution and Service Plan (the "Plan"), when effective in
      accordance with its terms, shall be the written plan contemplated by
      Securities and Exchange Commission Rule 12b-1 under the Investment Company
      Act of 1940, as amended (the "Act") for the Advisors Select Class shares
      of each Series identified in Appendix A, attached hereto (the "Series"), a
      class of shares of Principal Investors Fund, Inc. (the "Fund").

2.   The Fund has entered  into a  Distribution  Agreement on behalf of the Fund
     with Princor  Financial  Services  Corporation (the  "Distributor"),  under
     which the  Distributor  uses all reasonable  efforts,  consistent  with its
     other business,  to secure  purchasers of shares of each Series of the Fund
     (the  "Shares").  Such  efforts may  include,  but neither are  required to
     include  nor  are  limited  to,  the   following:   (1)   formulation   and
     implementation  of  marketing  and  promotional  activities,  such  as mail
     promotions and television,  radio, newspaper, magazine and other mass media
     advertising; (2) preparation, printing and distribution of sales literature
     provided  to the Fund's  shareholders  and  prospective  shareholders;  (3)
     preparation,  printing and  distribution of prospectuses  and statements of
     additional  information  of the Fund and reports to  recipients  other than
     existing shareholders of the Fund; (4) obtaining such information, analyses
     and reports with respect to marketing  and  promotional  activities  as the
     Distributor  may, from time to time, deem advisable;  (5) making payment of
     sales  commission,  ongoing  commissions  and other  payments  to  brokers,
     dealers,  financial  institutions  or others who sell  Shares  pursuant  to
     Selling Agreements;  (6) paying compensation to registered  representatives
     or other employees of the Distributor who engage in or support distribution
     of the Fund's Shares; (7) paying  compensation to, and expenses  (including
     overhead  and  telephone  expenses)  of,  the  Distributor;  (8)  providing
     training,  marketing  and support to dealers and others with respect to the
     sale of Shares; (9) receiving and answering correspondence from prospective
     shareholders including distributing prospectuses,  statements of additional
     information,  and  shareholder  reports;  (10)  providing of  facilities to
     answer  questions from prospective  investors about Shares;  (11) complying
     with federal and state  securities  laws  pertaining to the sale of Shares;
     (12)  assisting  investors in  completing  application  forms and selecting
     dividend and other  account  options;  (13)  providing of other  reasonable
     assistance in connection with the  distribution of the Fund's shares;  (14)
     organizing and conducting of sales seminars and making payments in the form
     of  transactional  compensation  or promotional  incentives;  and (15) such
     other  distribution  and services  activities as the Fund determines may be
     paid for by the Fund  pursuant to the terms of this Plan and in  accordance
     with Rule 12b-1 of the Act.

3.    The Distribution Agreement also authorizes the Distributor to enter into
      Service Agreements with other selling dealers and with banks or other
      financial institutions to provide shareholder services to existing
      Advisors Select Class shareholders, including without limitation, services
      such as furnishing information as to the status of shareholder accounts,
      responding to telephone and written inquiries of shareholders, and
      assisting shareholders with tax information.

4.   In consideration for the services provided and the expenses incurred by the
     Distributor  pursuant to the Distribution  Agreement and Paragraphs 2 and 3
     hereof, all with respect to Advisors Select Class shares of a Series of the
     Fund,  Advisors  Select Class of each Series shall pay to the Distributor a
     fee at the  annual  rate of  0.30%  (or  such  lesser  amount  as the  Fund
     Directors  may,  from time to time,  determine)  of the  average  daily net
     assets of Advisors  Select Class  shares of such Series.  This fee shall be
     accrued  daily and paid  monthly  or at such  other  intervals  as the Fund
     Directors shall determine.  The  determination of daily net assets shall be
     made at the close of business each day throughout the month and computed in
     the  manner  specified  in the  Fund's  then  current  Prospectus  for  the
     determination  of the net asset value of the Fund's  Advisors  Select Class
     shares.  The  Distributor  may use all or any  portion of the fee  received
     pursuant to this Plan to compensate securities dealers or other persons who
     have  engaged in the sale of Advisors  Select Class shares or to pay any of
     the expenses associated with other activities authorized under Paragraphs 2
     and 3 hereof.

5.   The Fund  presently  pays,  and will  continue to pay, a management  fee to
     Principal  Management  Corporation (the "Manager") pursuant to a Management
     Agreement between the Fund and the Manager (the "Management Agreement"). It
     is recognized that the Manager may use its management fee revenue,  as well
     as its past profits or its resources from any other source, to make payment
     to the Distributor with respect to any expenses incurred in connection with
     the distribution of Advisors Select Class shares,  including the activities
     referred  to in  Paragraph  2 hereof.  To the  extent  that the  payment of
     management  fees by the Fund to the Manager should be deemed to be indirect
     financing  of any  activity  primarily  intended  to  result in the sale of
     Advisors  Select Class shares  within the meaning of Rule 12b-1,  then such
     payment shall be deemed to be authorized by this Plan.

6.    This Plan shall not take effect until it has been approved (a) by a vote
      of at least a majority (as defined in the Act) of the outstanding Advisors
      Select Class shares of the Series of the Fund and (b) by votes of the
      majority of both (i) the Board of Directors of the Fund, and (ii) those
      Directors of the Fund who are not "interested persons" (as defined in the
      Act) of the Fund and who have no direct or indirect financial interest in
      the operation of this Plan or any agreements related to this Plan (the
      "Disinterested Directors"), cast in person at a meeting called for the
      purpose of voting on this Plan or such agreements.

7.    Unless sooner terminated pursuant to Paragraph 6, this Plan shall continue
      in effect for a period of twelve months from the date it takes effect and
      thereafter shall continue in effect so long as such continuance is
      specifically approved at least annually in the manner provided for
      approval of this Plan in Paragraph 6(b).

8.    A representative of the Underwriter shall provide to the Board and the
      Board shall review at least quarterly a written report of the amounts so
      expended and the purposes for which such expenditures were made.

9.    This Plan may be terminated at any time by vote of a majority of the
      Disinterested Directors, or by vote of a majority (as defined in the Act)
      of the outstanding Advisors Select Class shares of the Series of the Fund.

10.   Any agreement of the Fund related to this Plan shall be in writing and
      shall provide:

      A.  That such agreement may be terminated at any time, without payment of
          any penalty, by vote of a majority of the Disinterested Directors or
          by a vote of a majority (as defined in the Act) of the outstanding
          Advisors Select Class shares of the Series of the Fund on not more
          than sixty (60) days' written notice to any other party to the
          agreement); and

      B.  That such agreement shall terminate  automatically in the event of its
          assignment.

11.   While the Plan is in effect, the Fund's board of directors shall satisfy
      the fund governance standards as defined in Securities and Exchange
      Commission Rule 0-1(a)(7).

12.   This Plan does not require the Manager or Distributor to perform any
      specific type or level of distribution activities or to incur any specific
      level of expenses for activities primarily intended to result in the sale
      of Advisors Select Class shares.

13.   The Fund shall preserve copies of this Plan and any related agreements and
      all reports made pursuant to Paragraph 8, for a period of not less than
      six years from the date of the Plan, or the agreements or such report, as
      the case may be, the first two years in an easily accessible place.

14.   This Plan may not be amended to increase materially the amount of Fees
      provided for in Paragraph 4 hereof unless such amendment is approved in
      the manner provided for initial approval in Paragraph 6 hereof and no
      other material amendment to this Plan shall be made unless approved in the
      manner provided for initial approval in Paragraph 6(b) hereof.

      IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Plan as of the first date written above.


                PRINCIPAL INVESTORS FUND, INC.


                BY:
                     ------------------------------------------------------

                     DAVID W. MILES, SENIOR VICE PRESIDENT AND SECRETARY


                PRINCOR FINANCIAL SERVICES CORPORATION


                BY:
                     ------------------------------------------------------
                     MIKE J. BEER, PRESIDENT






              PRINCIPAL INVESTORS FUND, INC.
                        APPENDIX A
                          SERIES

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Bond and Mortgage Securities Fund          Partners LargeCap Value Fund
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Disciplined LargeCap Blend Fund            Partners LargeCap Value Fund I
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Diversified International Fund             Partners LargeCap Value Fund II
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Government & High Quality Bond Fund        Partners MidCap Growth Fund
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High Quality Intermediate-Term Bond Fund   Partners MidCap Growth Fund I Fund I
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Inflation Protection Fund                  Partners MidCap Growth Fund II
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International Emerging Markets Fund        Partners MidCap Value Fund
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International Growth Fund                  Partners MidCap Value Fund I
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LargeCap Growth Fund                       Partners SmallCap Blend Fund
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LargeCap S&P 500 Index Fund                Partners SmallCap Growth Fund I
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LargeCap Value Fund                        Partners SmallCap Growth Fund II
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LifeTime 2010 Fund                         Partners SmallCap Growth Fund III
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LifeTime 2020 Fund                         Partners SmallCap Value Fund
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LifeTime 2030 Fund                         Partners SmallCap Value Fund I
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LifeTime 2040 Fund                         Partners SmallCap Value Fund II
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LifeTime 2050 Fund                         Preferred Securities Fund
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LifeTime Strategic Income Fund             Real Estate Fund
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MidCap Blend Fund                          SAM Balanced Portfolio
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MidCap Growth Fund                         SAM Conservative Balanced Portfolio
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MidCap S&P 400 Index Fund                  SAM Conservative Growth Portfolio
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MidCap Value Fund                          SAM Flexible Income Portfolio
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Money Market Fund                          SAM Strategic Growth Portfolio
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Partners Global Equity Fund                Short-Term Bond Fund
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Partners International Fund                SmallCap Blend Fund
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Partners LargeCap Blend Fund               SmallCap Growth Fund
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Partners LargeCap Blend Fund I             SmallCap S&P 600 Index Fund
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Partners LargeCap Growth Fund              SmallCap Value Fund
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Partners LargeCap Growth Fund I            Ultra Short Bond Fund
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Partners LargeCap Growth Fund II
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