[DUPONT LOGO]                                                   [DUPONT ADDRESS]

                            NOTICE TO OPTION HOLDERS

THE OFFER CONTAINED IN THIS LETTER HAS NOT BEEN APPROVED OR DISAPPROVED BY ANY
SECURITIES REGULATORY AUTHORITY NOR HAS ANY SECURITIES REGULATORY AUTHORITY
PASSED UPON THE FAIRNESS OR MERITS OF THE OFFER OR UPON THE ADEQUACY OF THE
INFORMATION CONTAINED IN THIS DOCUMENT. ANY REPRESENTATION TO THE CONTRARY IS
UNLAWFUL. THE OFFER CONTAINED IN THIS LETTER IS NOT BEING MADE TO OPTION HOLDERS
IN ANY JURISDICTION IN WHICH THE MAKING OR ACCEPTANCE OF THIS OFFER WOULD NOT BE
IN COMPLIANCE WITH THE LAWS OF SUCH JURISDICTION. HOWEVER EID MAY, IN ITS SOLE
DISCRETION, TAKE SUCH ACTION AS IT MAY DEEM NECESSARY TO EXTEND THIS OFFER TO
OPTION HOLDERS IN ANY JURISDICTION.

                             OPTION EXCHANGE LETTER

April 17, 2003

TO: All Holders of options of DuPont Canada Inc. ("DuPont Canada") under the
    DuPont Canada Employee Stock Option Plan

Dear Option Holder:

     As you may be aware, DCI Acquisition Inc. (the "Purchaser"), a subsidiary
of E. I. du Pont de Nemours and Company ("EID"), has made an offer (the "Offer")
to purchase all of the outstanding class A common shares, series 1 of DuPont
Canada not already owned by the Purchaser and its affiliates. If the Purchaser
acquires these shares, DuPont Canada will likely cease to be a publicly traded
company.

     The Offer to purchase DuPont Canada shares does not extend to DuPont Canada
options. However, subject to obtaining all necessary regulatory and other
approvals, EID is providing you with the opportunity to receive options to
acquire shares of common stock of EID, if you surrender all of your unexercised
options under the DuPont Canada Employee Stock Option Plan. EID is a publicly
traded company listed on the New York Stock Exchange and trades under the symbol
"DD". If you would like more information on EID, including links to recent
filings EID has made with the U.S. Securities and Exchange Commission (the
"SEC"), please refer to our website at
http://www1.dupont.com/NASApp/dupontglobal/corp/index.jsp. You are encouraged to
review this publicly available information prior to surrendering your
unexercised DuPont Canada options. In addition, you should carefully review the
Questions and Answers in the accompanying materials for more information about
this offer.

     The offer by EID to issue you options to acquire shares of common stock of
EID is conditional upon (i) you surrendering to DuPont Canada all of your
options under the DuPont Canada Employee Stock Option Plan (whether vested or
unvested and whether "in the money" or not) which are unexercised as of the
Effective Date (as defined below); and (ii) the Purchaser taking up the shares
deposited under the Offer. The surrender of your unexercised options and the
issuance of EID options to you will be effective on the last date that the
Purchaser takes up shares under the Offer (the "Effective Date"). If the
Purchaser does not take up the shares deposited under the Offer, your surrender
will not take effect and you will continue to hold your DuPont Canada options.
For an explanation of what it means to "take up" shares, refer to the Questions
and Answers in the accompanying materials.

     If you have DuPont Canada options that have vested, you may, in lieu of
surrendering those options in exchange for EID options, exercise your right to
acquire DuPont Canada shares pursuant to those options and tender those shares
to the Purchaser under the Offer. AS EXPLAINED IN THE ACCOMPANYING QUESTIONS &
ANSWERS, SUCH AN EXERCISE COULD HAVE ADVERSE TAX CONSEQUENCES. Once you receive
your DuPont Canada shares, you will have certain rights as a shareholder. For
more information on these rights, refer to the offering circular furnished in
connection with the Offer. You should be aware that if you plan to exercise any
options and tender shares under the Offer, we recommend that you exercise your
DuPont Canada options no later than May 9, 2003 in order to ensure that you
receive your DuPont Canada shares in time to tender under the Offer. For more
information on how to tender your shares, refer to the offering circular
furnished in connection with the Offer. Unless all of your options are vested
and you plan to exercise all of them in time to tender under the Offer, if you
wish to receive EID options in exchange for the surrender of your remaining
unexercised options, you must still submit the Election Form in the accompanying
materials in order to receive those EID options.


EID OPTIONS

     The exchange of options is designed to preserve, to the extent possible,
the intrinsic value of your DuPont Canada options. If the Purchaser takes up the
shares deposited under the Offer, the number of EID options you will receive in
exchange for the surrender of your DuPont Canada options will equal the number
of DuPont Canada options you surrender divided by the "Exchange Ratio", and then
rounded down to the nearest whole number. The Exchange Ratio is equal to the
closing price on the New York Stock Exchange of the shares of common stock of
EID on the last trading day prior to the Effective Date, divided by the price
per share offered by the Purchaser for the class A common shares, series 1 of
DuPont Canada on the Effective Date. For more information on how the number of
EID options will be calculated, refer to the Questions and Answers in the
accompanying materials.

     The exercise price for your EID options will equal the exercise price of
your DuPont Canada options multiplied by the Exchange Ratio, and then rounded up
to the next whole cent. For more information on how the exercise price will be
calculated, refer to the Questions and Answers in the accompanying materials.

     For purposes of these calculations, U.S. and Canadian dollars will be
converted using the noon rate of exchange as reported by the Bank of Canada on
the last business day prior to the Effective Date.

     You may have DuPont Canada options which have been granted at different
times and/or at different exercise prices. If you choose to receive EID options,
you must surrender all of your unexercised DuPont Canada options. The number and
exercise price of the EID options that you will receive will be calculated for
each separate grant of options that you surrender. Provided that all of the
conditions have been met and all necessary regulatory and other approvals have
been received, you should receive information on the number of EID options that
have been granted to you and their exercise price by mail within two to three
weeks after the deadline for submitting the Election Form has passed.

     The other terms and conditions of your EID options, including the dates of
vesting, post-employment exercisability provisions and expiration of the
options, will be the same as the terms and conditions of your DuPont Canada
options.

REASONS TO ACCEPT THIS OFFER

     If you are a Canadian resident, there may be tax benefits if you elect to
exchange your existing DuPont Canada options for EID options. For more
information on the tax treatment, refer to the Questions and Answers in the
accompanying materials. You should be aware that the information we have
provided on Canadian tax is not exhaustive of all Canadian federal income tax
considerations. YOU SHOULD CONSULT YOUR OWN TAX ADVISORS WITH RESPECT TO YOUR
PARTICULAR CIRCUMSTANCES, INCLUDING THE APPLICATION AND EFFECT OF THE INCOME AND
OTHER TAX LAWS OF YOUR COUNTRY, PROVINCE, TERRITORY, STATE OR LOCAL TAX
AUTHORITY.

     EID options provide you with the opportunity to participate in any
potential future appreciation in the value of the shares of common stock of EID.
If the Purchaser takes up the shares deposited under the Offer, it, or one of
its affiliates, may effect an amalgamation, statutory arrangement, capital
reorganization or similar transaction involving DuPont Canada. If such an
amalgamation, statutory arrangement, capital reorganization or similar
transaction occurs, EID expects that the remaining class A common shares, series
1 of DuPont Canada, that have not been tendered under the Offer and which are
not held by the Purchaser and its affiliates, will be converted into preferred
shares. EID further expects that the preferred shares will have a fixed
redemption value and will be immediately redeemable for a cash amount equal to
the price per share offered under the Offer as at the Effective Date. This means
that if you do not elect to exchange your unexercised DuPont Canada options for
EID options, then after the amalgamation, arrangement, capital reorganization or
similar transaction occurs, you will not be able to exercise your DuPont Canada
options and receive DuPont Canada common shares. Instead, upon the exercise of
your DuPont Canada options, you will receive preferred shares, immediately
redeemable at a fixed value, which may be less than the exercise price of your
DuPont Canada options. This means you will not be able to participate in any
potential future appreciation in the value of the shares of DuPont Canada or
EID, and you will be fully taxable on the entire amount of the stock option
benefit (i.e. the excess of the redemption value of the preferred shares over
the price paid for the shares).


HOW TO EXCHANGE DUPONT CANADA OPTIONS

     IN ORDER TO EXCHANGE YOUR OPTIONS THE ELECTION FORM ENCLOSED IN THIS
PACKAGE MUST BE RECEIVED BY COMPUTERSHARE TRUST COMPANY OF CANADA
("COMPUTERSHARE") BY 3:00 P.M. EDT ON MAY 22, 2003. If your Election Form is not
received by Computershare on or before the deadline you will not be able to
exchange your options.

HOW TO OBTAIN EID INFORMATION

     If you would like more information on EID, including links to recent
filings EID has made with the SEC please refer to our website at
http://www1.dupont.com/NASApp/dupontglobal/corp/index.jsp. In addition,
information about EID may also be found in the following printed reports, which
may be obtained without charge: 2002 Annual Review; 2002 Annual Report to the
SEC filed on Form 10-K; and Quarterly reports to the SEC filed on Form 10-Q.
Requests for copies of these documents should be addressed to: DuPont Corporate
Information Center, CRP705-GS25, P.O. Box 80705, Wilmington, DE 19880-0705.
Alternatively, you may phone (302)774-5991 or e-mail find.info@usa.dupont.com to
obtain copies of these documents.

Sincerely,

(-s- John P. Jessup)
John P. Jessup
Vice President and Treasurer