STRATUS COMPUTER INC
SC 13G/A, 1997-12-08
ELECTRONIC COMPUTERS
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<PAGE>   1


                     SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D.C. 20549



                                SCHEDULE 13G

                  Under the Securities Exchange Act of 1934

                              (Amendment No. 1)

                       Stratus Computer, Incorporated
- --------------------------------------------------------------------------------
                              (Name of Issuer)

                                Common Stock
- --------------------------------------------------------------------------------
                       (Title of class of securities)

                                  863155107
- --------------------------------------------------------------------------------
                               (CUSIP number)


Check the following box if a fee is being paid with this statement [x] (A fee
is not required only if the  filing person: (1) has a previous statement on
file reporting beneficial ownership of more than five percent of  the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting  beneficial ownership of five percent or less of such class.)
(See Rule 13d-7).

The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which  would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be
deemed to be "filed" for the  purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities  of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the notes).
<PAGE>   2
CUSIP No.       863155107            13G                       Page 2 of 9 Pages

- -------------------------------------------------------------------------------
      1  NAME OF REPORTING PERSONS
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                    Morgan Stanley, Dean Witter, Discover & Co.
                    IRS # 39-314-5972
- -------------------------------------------------------------------------------
      2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                   (a) [ ]
                                                                   (b) [ ]

- -------------------------------------------------------------------------------
      3  SEC USE ONLY


- -------------------------------------------------------------------------------
      4  CITIZENSHIP OR PLACE OF ORGANIZATION
                    The state of organization is Delaware.

- -------------------------------------------------------------------------------
  NUMBER OF       5 SOLE VOTING POWER
   SHARES                           0
  BENEFICIALLY    -------------------------------------------------------------
  OWNED BY        6 SHARED VOTING POWER
    EACH                    2,784,491
  REPORTING       -------------------------------------------------------------
  PERSON WITH     7 SOLE DISPOSITIVE POWER
                                    0
                  -------------------------------------------------------------
                  8 SHARED DISPOSITIVE POWER
                            3,189,418
- -------------------------------------------------------------------------------
      9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                    3,189,418

- -------------------------------------------------------------------------------
     10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*


- -------------------------------------------------------------------------------
     11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
                        11.60%

- -------------------------------------------------------------------------------
     12  TYPE OF REPORTING PERSON*
                    IA, CO
- -------------------------------------------------------------------------------

                   * SEE INSTRUCTIONS BEFORE FILLING OUT !
<PAGE>   3
CUSIP No.       863155107            13G                       Page 3 of 9 Pages

- -------------------------------------------------------------------------------
      1  NAME OF REPORTING PERSONS
             S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                Miller Anderson & Sherrerd LLP
                IRS # 23-17441222
- -------------------------------------------------------------------------------
      2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a) [ ]
                                                                 (b) [ ]

- -------------------------------------------------------------------------------
      3  SEC USE ONLY


- -------------------------------------------------------------------------------
      4  CITIZENSHIP OR PLACE OF ORGANIZATION
                The state of organization is Delaware.

- -------------------------------------------------------------------------------
  NUMBER OF       5 SOLE VOTING POWER
   SHARES                          0
  BENEFICIALLY    -------------------------------------------------------------
  OWNED BY        6 SHARED VOTING POWER
    EACH                    2,593,900
  REPORTING       -------------------------------------------------------------
  PERSON WITH     7 SOLE DISPOSITIVE POWER
                                    0
                  -------------------------------------------------------------
                  8 SHARED DISPOSITIVE POWER
                            2,978,400
- -------------------------------------------------------------------------------
      9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                2,978,400

- -------------------------------------------------------------------------------
     10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*


- -------------------------------------------------------------------------------
     11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
                    10.83%

- -------------------------------------------------------------------------------
     12  TYPE OF REPORTING PERSON*
                IA, CO
- -------------------------------------------------------------------------------

                   * SEE INSTRUCTIONS BEFORE FILLING OUT !
<PAGE>   4
CUSIP No.     863155107              13G                      Page 4 of 9 Pages

Item 1 (a)    Name of Issuer

              Stratus Computer, Incorporated

Item 1 (b)    Address of issuer's principal executive offices

              55 Fairbanks Boulevard
              Marlborough, Massuchusetts 01752

Item 2 (a)    Name of person filing

              (a) Morgan Stanley, Dean Witter, Discover & Co.
              (b) Miller Anderson & Sherrerd LLP

Item 2 (b)    Principal business office

              (a) 1585 Broadway
                  New York, New York 10036

              (b) 1 Tower Bridge Suite 1100
                  West Conshohocken, PA 19428

Item 2 (c)    Citizenship

              Incorporated by reference to Item 4 of the cover
              page pertaining to each reporting person.

Item 2 (d)    Title of class of Securities

              Common Stock

Item 2 (e)    Cusip No.

              863155107

Item 3    (a) Morgan Stanley, Dean Witter, Discover & Co. is (e) an Investment
              Adviser registered under section 203 of the Investment Advisers 
              Act of 1940.

          (b) Miller Anderson & Sherrerd LLP is (e) an Investment Adviser
              registered under Section 203 of the Investment Advisers Act of
              1940.

Item 4        Ownership

              Incorporated by reference to Items (5) - (9) and (11) of the
              cover page.
<PAGE>   5
        CUSIP No.      863155107             13G               Page 5 of 9 Pages



Item 5   Ownership of 5 Percent or Less of a Class

         Inapplicable

Item 6   Ownership of More than 5 Percent on Behalf of Another Person

         Accounts managed on a discretionary basis by a wholly owned subsidiary
         of Morgan Stanley, Dean Witter, Discover & Co., Miller Anderson & 
         Sherrerd LLP, are known to have the right to receive or the power to 
         direct the receipt of of dividends from, or the proceeds from, the 
         sale of such securities. No such account holds more than 5 percent of
         the class.


Item 7   Identification and Classification of the Subsidiary Which Acquired
         the Security Being Reported on By the Parent Holding Company

         Inapplicable

Item 8   Identification and Classification of Members of the Group

         Inapplicable

Item 9   Notice of Dissolution of Group

         Inapplicable

Item 10  Certification

         By signing below I certify that, to the best of my knowledge and
         belief, the securities referred to above were acquired in the ordinary
         course of business and were not acquired for the purpose of and do not
         have the effect of changing or influencing the control of the issuer of
         such securities and were not acquired in connection with or as a
         participant in any transaction having such purpose or effect.
<PAGE>   6
CUSIP No.     863155107               13G                      Page 6 of 9 Pages




                After reasonable inquiry and to the best of my knowledge and
                belief, I certify that the information set forth in this 
                statement is true, complete and correct.


Date :          December 8,1997

Signature :     /s/ Donald P. Ryan 
                ---------------------------------------------------------------

Name / Title :  Donald P. Ryan / Vice President Morgan Stanley Asset
                Management Inc. 
                ---------------------------------------------------------------
                MILLER ANDERSON & SHERRERD LLP

Date :          December 8, 1997

Signature :     /s/ Bruce Bromberg
                ---------------------------------------------------------------

Name / Title :  Bruce Bromberg / Morgan Stanley & Co. Incorporated 
                ---------------------------------------------------------------
                MORGAN STANLEY, DEAN WITTER, DISCOVER & CO.




                       INDEX TO EXHIBITS                           PAGE
                       -----------------                           ----

EXHIBIT 1       Agreement to Make a Joint Filing                      7

EXHIBIT 2       Secretary's Certificate Authorizing Bruce Bromberg    8
                to Sign on behalf of Morgan Stanley, Dean Witter,
                Discover & Co.

EXHIBIT 3       Secretary's Certificate Authorizing Donald P. Ryan    9
                to Sign on behalf of Miller Anderson & Sherrerd LLP


<PAGE>   1
CUSIP No.      863155107             13G                       Page 7 of 9 Pages



                          EXHIBIT 1 TO SCHEDULE 13G
                      ----------------------------------

                               December 8, 1997
                      ----------------------------------



           MORGAN STANLEY, DEAN WITTER, DISCOVER & CO. and MILLER ANDERSON & 

         SHERRERD LLP, hereby agree that, unless differentiated, this Schedule 

         13G is filed on behalf of each of the parties.
         

            MILLER ANDERSON & SHERRERD LLP

   BY:      /s/ Donald P. Ryan 
            --------------------------------------------------------------------
            Donald P. Ryan / Vice President Morgan Stanley Asset Management Inc.

            MORGAN STANLEY, DEAN WITTER, DISCOVER & CO.

   BY:      /s/ Bruce Bromberg
            --------------------------------------------------------------------
            Bruce Bromberg / Morgan Stanley & Co. Incorporated


<PAGE>   1
                                                          -----------------     
                                                          Page 8 of 9 Pages
                                                          -----------------
                                 

                                  EXHIBIT 2
                                      
                                      
                                MORGAN STANLEY
                                      
                           SECRETARY'S CERTIFICATE
                                      
                  I, Charlene R. Herzer, a duly elected and acting Assistant
Secretary of Morgan Stanley, Dean Witter, Discover & Co., a corporation 
organized and existing under the laws of the State of Delaware (the
"Corporation"), certify that as approved by a Unanimous Consent of Directors in
Lieu of a Meeting dated as of May 31, 1997, the following persons are each
authorized to sign reports to be filed under Sections 13 nd 16 of the
Securities Exchange Act of 1934 on behalf of the Corporation, and such
authorizations are in full force and effect as of this date:

                             Stuart J. M. Breslow
                             Robert G. Koppenol
                             Bruce Bromberg
                             Robin Sherak

                  IN WITNESS WHEREOF, I have hereunto set my name and affixed
the seal of the Corporation as of the 3rd day of June, 1997.

                                            /S/ Charlene R. Herzer
                                            ------------------------------------
                                            CHARLENE R. HERZER
                                            ASSISTANT SECRETARY

[SEAL]

<PAGE>   1
                                                            -----------------
                                                            Page 9 of 9 Pages
                                                            -----------------



                           SECRETARY'S CERTIFICATE



          I, Charlene R. Herzer, a duly elected and acting Assistant Secretary
of Morgan Stanley Asset Management Holdings Inc., a corporation organized and
existing under the laws of the State of Delaware (the "Corporation"), certify
that the following resolutions were duly and validly adopted by a Consent in
Lieu of a Meeting of the Board of Directors of the Corporation dated as of
February 4, 1997 and that resolutions are in full force and effect on the date
hereof:

          RESOLVED, that Harold J. Schaaff, Jr. and Donald P. Ryan are each
    authorized to sign on behalf of (i) Morgan Stanley Asset Management
    Holdings Inc. (the "Corporation"), as the sole general partner of Miller
    Anderson & Sherrerd, LLP (the "LLP"), and (ii) the LLP any reports to be
    filed under Section 13 and Section 16 of the Securities Exchange Act of 
    1934, as amended, and the rules and regulations thereunder, with the 
    Securities and Exchange Commission, each such authorization to cease 
    automatically upon such individual's termination of employment with any 
    affiliate of the Corporation; and 

          RESOLVED FURTHER, that all prior actions taken by Harold J. Schaaff,
    Jr. and Donald P. Ryan that are within the authority conferred by the
    foregoing resolution are approved, ratified and confirmed in all respects;
    and

          RESOLVED FURTHER, that any and all actions to be taken, caused to be
    taken or heretofore taken by any officer of the Corporation in executing
    any and all documents, agreements and instruments and in taking any and all
    steps (including the payment of all expenses) deemed by such officer as
    necessary or desirable to carry out the intents and purposes of the
    foregoing resolutions are authorized, ratified and confirmed.

          IN WITNESS WHEREOF, I have hereunto set my name and affixed the seal
of the Corporation as of the 11th day of February, 1997.


                                             /s/ CHARLENE R. HERZER
                                             ----------------------
                                             CHARLENE R. HERZER
                                             ASSISTANT SECRETARY


[SEAL]


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