<DOCUMENT>
<TYPE>DEFA14A
<SEQUENCE>1
<FILENAME>f67587defa14a.txt
<DESCRIPTION>DEFINITIVE PROXY ADDITIONAL MATERIALS
<TEXT>

<PAGE>   1
                                  SCHEDULE 14A
                     INFORMATION REQUIRED IN PROXY STATEMENT
                            SCHEDULE 14A INFORMATION
PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934

Filed by the Registrant [X]
Filed by a Party other than the Registrant [ ]

Check the appropriate box:
[ ]  Preliminary Proxy Statement
[ ]  Definitive Proxy Statement
[X]  Definitive Additional Materials
[ ]  Soliciting Material Pursuant to Rule 14a-11(c) or Rule 14a-12

[ ]  Confidential, for Use of the Commission Only (as permitted by Rule
     14a-6(e)(2))

                              SYMANTEC CORPORATION
     -----------------------------------------------------------------------
                (Name of Registrant as Specified In Its Charter)

  ---------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):
[X]  No fee required.
[ ]  Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

(1) Title of each class of securities to which transaction applies: ____________
(2) Aggregate number of securities to which transaction applies:________________
(3) Per unit price or other underlying value of transaction computed pursuant to
Exchange Act Rule 0-11 (Set forth the amount on which the filing fee is
calculated and state how it was determined):____________________________________
(4) Proposed maximum aggregate value of transaction:____________________________
(5) Total fee paid:_____________________________________________________________

[ ] Fee paid previously with preliminary materials.
[ ] Check box if any part of the fee is offset as provided by Exchange Act Rule
0-11(a)(2) and identify the filing for which the offsetting fee was paid
previously. Identify the previous filing by registration statement number, or
the Form or Schedule and the date of its filing.
(1) Amount Previously Paid:_____________________________________________________
(2) Form, Schedule or Registration Statement No.:_______________________________
(3) Filing Party: ______________________________________________________________
(4) Date Filed: ________________________________________________________________
<PAGE>   2
                               IMPORTANT REMINDER


We have previously sent to you proxy material for the Special Meeting of
Symantec Corporation to be held on December 15, 2000. YOUR BOARD OF DIRECTORS
HAS UNANIMOUSLY RECOMMENDED THAT SHAREHOLDERS VOTE FOR PROPOSALS 1, 2 AND 3.

YOUR VOTE IS IMPORTANT, no matter how many or how few shares you may own.
Whether or not you have already done so, please sign, date and return the
enclosed proxy card today in the envelope provided.

Thank you for your support,

SYMANTEC CORPORATION


================================================================================

            If you have any questions, or need assistance in voting
                 your shares, please call our proxy solicitor.


                           INNISFREE M&A INCORPORATED
                         TOLL-FREE, AT 1-888-750-5834.


                                IMPORTANT NOTE:
               IF YOU HOLD YOUR SHARES THROUGH A BANK OR BROKER,
           YOU MAY BE ABLE TO VOTE BY TELEPHONE, OR VIA THE INTERNET.
            PLEASE CALL INNISFREE AT 1-888-750-5834 FOR ASSISTANCE.

================================================================================


November 24, 2000

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