RATIONAL SOFTWARE CORP
DEFA14A, 1998-06-16
PREPACKAGED SOFTWARE
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                           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        [_]  CONFIDENTIAL, FOR USE OF THE 
                                             COMMISSION ONLY (AS PERMITTED BY
                                             RULE 14A-6(E)(2))
[_]  Definitive Proxy Statement 

[X]  Definitive Additional Materials 

[_]  Soliciting Material Pursuant to Section 240.14a-11(c) or Section 240.14a-12


                         RATIONAL SOFTWARE CORPORATION
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               (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:

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     (2) Aggregate number of securities to which transaction applies:

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     (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:

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     (5) Total fee paid:

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[_]  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:
 
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     (2) Form, Schedule or Registration Statement No.:

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     (3) Filing Party:
      
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     (4) Date Filed:

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Notes:



<PAGE>
 
                              CORRECTION NOTICE
                        TO NOTICE AND PROXY STATEMENT
                      OF RATIONAL SOFTWARE CORPORATION
                             DATED JUNE 10, 1998

To vote your shares over the Internet, you need to access the website at 
ProxyVote.com. In error, the website address provided in the proxy statement 
stated InvestorDelivery.com.

Rational's Annual Report on Form 10-K and Proxy Statement are available over 
the Internet via our website at rational.com/world/investor/proxyvote.

Furthermore, only stockholders holding their shares of Common Stock in "street 
name" through a broker, and not registered stockholders, may vote by telephone 
or via the Internet. In error, the proxy statement stated that registered 
shareholders could vote by telephone or via the Internet.

Thank you for your attention.



Cupertino, California
June 15, 1998


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