EXHIBIT A-1

                           FORM OF PREFERRED SECURITY

                           [FORM OF FACE OF SECURITY]

     [Include if Preferred  Security is in global form and the Depository  Trust
Company is the U. S.  Depositary--UNLESS  THIS  CERTIFICATE  IS  PRESENTED BY AN
AUTHORIZED   REPRESENTATIVE  OF  THE  DEPOSITORY  TRUST  COMPANY,   A  NEW  YORK
CORPORATION  ("DTC"),  NEW  YORK,  NEW  YORK,  TO THE  COMPANY  OR ITS AGENT FOR
REGISTRATION OF TRANSFER,  EXCHANGE OR PAYMENT,  AND ANY  CERTIFICATE  ISSUED IS
REGISTERED  IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS IS  REQUESTED  BY AN
AUTHORIZED  REPRESENTATIVE  OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO., OR TO
SUCH OTHER ENTITY AS IS REQUESTED BY AN  AUTHORIZED  REPRESENTATIVE  OF DTC) ANY
TRANSFER,  PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON
IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST
HEREIN.]

     [Include if Preferred Security is in global  form--TRANSFERS OF THIS GLOBAL
SECURITY SHALL BE LIMITED TO TRANSFERS IN WHOLE, BUT NOT IN PART, TO NOMINEES OF
DTC OR TO A  SUCCESSOR  THEREOF OR SUCH  SUCCESSOR'S  NOMINEE AND  TRANSFERS  OF
PORTIONS  OF  THIS  GLOBAL  SECURITY  SHALL  BE  LIMITED  TO  TRANSFERS  MADE IN
ACCORDANCE  WITH THE  RESTRICTIONS  SET  FORTH IN THE  DECLARATION  REFERRED  TO
BELOW.]

     THIS  SECURITY,  ANY  CONVERTIBLE  DEBENTURE  ISSUED IN  EXCHANGE  FOR THIS
SECURITY  AND ANY  COMMON  STOCK  ISSUED  ON  CONVERSION  THEREOF  HAVE NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES  ACT"),
OR ANY  STATE  SECURITIES  LAWS.  NEITHER  THIS  SECURITY  NOR ANY  INTEREST  OR
PARTICIPATION  HEREIN MAY BE REOFFERED,  SOLD, ASSIGNED,  TRANSFERRED,  PLEDGED,
ENCUMBERED  OR  OTHERWISE  DISPOSED  OF IN THE ABSENCE OF SUCH  REGISTRATION  OR
UNLESS SUCH  TRANSACTION  IS EXEMPT  FROM,  OR NOT SUBJECT TO, THE  REGISTRATION
REQUIREMENTS  OF  THE  SECURITIES  ACT.  THE  HOLDER  OF  THIS  SECURITY  BY ITS
ACCEPTANCE  HEREOF AGREES TO OFFER,  SELL OR OTHERWISE  TRANSFER SUCH  SECURITY,
PRIOR TO THE DATE WHICH IS THREE YEARS AFTER (OR SUCH SHORTER  PERIOD UNDER RULE
144A UNDER THE SECURITIES  ACT OR ANY SUCCESSOR  RULE) THE LATER OF THE ORIGINAL
ISSUE DATE HEREOF AND THE LAST DATE ON WHICH VANSTAR CORPORATION (THE "COMPANY")
OR ANY  AFFILIATE  OF THE  COMPANY  WAS  THE  OWNER  OF  THIS  SECURITY  (OR ANY
PREDECESSOR OF THIS SECURITY) (THE "RESALE  RESTRICTION  TERMINATION DATE") ONLY
(A) TO THE COMPANY,  (B) PURSUANT TO AN EFFECTIVE  REGISTRATION  STATEMENT UNDER
THE SECURITIES ACT, (C) FOR SO LONG AS


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THE  SECURITIES  ARE  ELIGIBLE  FOR  RESALE  PURSUANT  TO RULE  144A  UNDER  THE
SECURITIES ACT ("RULE 144A"), TO A PERSON IT REASONABLY BELIEVES IS A "QUALIFIED
INSTITUTIONAL  BUYER" AS DEFINED IN RULE 144A THAT PURCHASES FOR ITS OWN ACCOUNT
OR FOR THE  ACCOUNT OF A QUALIFIED  INSTITUTIONAL  BUYER TO WHOM NOTICE IS GIVEN
THAT THE TRANSFER IS BEING MADE IN RELIANCE ON RULE 144A, (D) PURSUANT TO OFFERS
AND SALES TO NON-U.S.  PERSONS THAT OCCUR  OUTSIDE THE UNITED  STATES WITHIN THE
MEANING  OF  REGULATION  S UNDER THE  SECURITIES  ACT,  (E) TO AN  INSTITUTIONAL
"ACCREDITED INVESTOR" WITHIN THE MEANING OF SUBPARAGRAPH (a)(1), (2), (3) OR (7)
OF RULE 501 UNDER THE  SECURITIES ACT THAT IS ACQUIRING THE SECURITY FOR ITS OWN
ACCOUNT, OR FOR THE ACCOUNT OF SUCH AN INSTITUTIONAL  "ACCREDITED INVESTOR," FOR
INVESTMENT  PURPOSES AND NOT WITH A VIEW TO, OR FOR OFFER OR SALE IN  CONNECTION
WITH, ANY  DISTRIBUTION  IN VIOLATION OF THE SECURITIES  ACT, OR (F) PURSUANT TO
ANOTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES
ACT,  SUBJECT TO THE COMPANY'S AND THE TRANSFER  AGENT'S RIGHT PRIOR TO ANY SUCH
OFFER,  SALE OR TRANSFER  (i) PURSUANT TO CLAUSES (D), (E) OR (F) TO REQUIRE THE
DELIVERY  OF AN OPINION  OF  COUNSEL,  CERTIFICATION  AND/OR  OTHER  INFORMATION
SATISFACTORY  TO EACH OF  THEM,  AND  (ii) IN EACH OF THE  FOREGOING  CASES,  TO
REQUIRE THAT A CERTIFICATE OF TRANSFER IN THE FORM APPEARING ON THIS SECURITY IS
COMPLETED AND DELIVERED BY THE  TRANSFEROR  TO THE TRANSFER  AGENT.  THIS LEGEND
WILL BE  REMOVED  UPON THE  REQUEST  OF A HOLDER  AFTER THE  RESALE  RESTRICTION
TERMINATION DATE.

Certificate Number                           Number of Preferred Securities
                                             [CUSIP NO [                    ]]
                                             [ISIN NO.  [                   ]]

                              Preferred Securities

                                       of

                             Vanstar Financing Trust


                  6 3/4% Trust Convertible Preferred Securities
        (liquidation amount $50 per Trust Convertible Preferred Security)

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     Vanstar  Financing Trust, a statutory  business trust formed under the laws
of the State of Delaware (the "Trust"),  hereby certifies that _________________
______________ (the "Holder") is the registered owner of  ______________(______)
) preferred securities of the Trust representing  undivided beneficial interests
in the assets of the Trust  designated  the 6 3/4% Trust  Convertible  Preferred
Securities  (liquidation  amount $50 per Trust Convertible  Preferred  Security)
(the "Preferred  Securities").  The Preferred Securities are transferable on the
books and records of the Trust, in person or by a duly authorized attorney, upon
surrender of this certificate duly endorsed and in proper form for transfer. The
designation, rights, privileges,  restrictions,  preferences and other terms and
provisions of the Preferred  Securities  represented hereby are issued and shall
in all  respects  be subject  to the  provisions  of the  Amended  and  Restated
Declaration  of Trust of the Trust dated as of October 2, 1996,  as the same may
be amended from time to time (the  "Declaration"),  including the designation of
the  terms  of  the  Preferred  Securities  as  set  forth  in  Annex  I to  the
Declaration.  Capitalized  terms  used  herein  but not  defined  shall have the
meaning given them in the Declaration. The Holder is entitled to the benefits of
the Preferred  Securities  Guarantee to the extent provided therein. The Sponsor
will provide a copy of the Declaration,  the Preferred  Securities Guarantee and
the Indenture to a Holder  without  charge upon written  request to the Trust at
its principal place of business.

     Reference is hereby made to select  provisions of the Preferred  Securities
set forth on the reverse hereof,  which select provisions shall for all purposes
have the same effect as if set forth at this place.

     Upon receipt of this  certificate,  the Holder is bound by the  Declaration
and is entitled to the benefits thereunder.

     By acceptance, the Holder agrees to treat, for United States federal income
tax purposes,  the Debentures as  indebtedness  and the Preferred  Securities as
evidence of indirect beneficial ownership in the Debentures.






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     Unless the Property Trustee's Certificate of Authentication hereon has been
properly  executed,  these  Preferred  Securities  shall not be  entitled to any
benefit under the Declaration or be valid or obligatory for any purpose.
     IN WITNESS  WHEREOF,  the Trust has executed this certificate on __________
__, 1996.


                                   VANSTAR FINANCING TRUST


                                   By:
                                      ---------------------------------------
                                      Name:
                                      Title: Regular Trustee







                PROPERTY TRUSTEE'S CERTIFICATE OF AUTHENTICATION
     This is one of the Preferred Securities referred to in the within-mentioned
Declaration.

Dated: ___________________, _____


                                   WILMINGTON TRUST COMPANY
                             as Property Trustee


                                   By:
                                      ---------------------------------------
                                      Authorized Signatory







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                          [FORM OF REVERSE OF SECURITY]

     Distributions  payable on each  Preferred  Security will be fixed at a rate
per annum of 6 3/4% (the "Coupon Rate") of the stated  liquidation amount of $50
per  Preferred  Security,  such rate being the rate of  interest  payable on the
Debentures to be held by the Property Trustee. Distributions in arrears for more
than one quarter will bear interest thereon  compounded  quarterly at the Coupon
Rate (to the extent  permitted by applicable  law). The term  "Distribution"  as
used herein includes any such interest including Additional Interest, Compounded
Interest and Liquidated Damages payable unless otherwise stated, and any premium
and/or principal on the Debentures. A Distribution is payable only to the extent
that payments are made in respect of the Debentures held by the Property Trustee
and to the extent the Property Trustee has funds available therefor.  The amount
of Distributions  payable for any period will be computed for any full quarterly
Distribution  period on the basis of a 360-day year of twelve 30-day months, and
for any  period  shorter  than a full  quarterly  Distribution  period for which
Distributions are computed,  Distributions  will be computed on the basis of the
actual number of days elapsed per 30-day month.

     Except  as  otherwise  described  below,  distributions  on  the  Preferred
Securities  will be cumulative,  will accrue from the date of original  issuance
and will be  payable  quarterly  in  arrears,  on January 1, April 1, July 1 and
October 1 of each year,  commencing  on  January  1, 1997,  to Holders of record
fifteen  (15) days  prior to such  payment  dates,  which  payment  dates  shall
correspond to the interest payment dates on the Debentures. The Debenture Issuer
has the right under the Indenture to defer payments of interest by extending the
interest  payment  period  from time to time on the  Debentures  for  successive
periods not  exceeding 20  consecutive  quarters  (each an  "Extension  Period")
during  which  Extension  Period no  interest  shall be due and  payable  on the
Debentures;  PROVIDED,  that no Extension Period shall extend beyond the date of
maturity of the Debentures.  As a consequence of such  extension,  Distributions
will also be deferred.  Despite such  extension,  quarterly  Distributions  will
continue to accrue with interest  thereon (to the extent permitted by applicable
law) at the Coupon Rate compounded  quarterly during any such Extension  Period.
Prior to the termination of any such Extension Period,  the Debenture Issuer may
further  extend such Extension  Period;  PROVIDED,  that such  Extension  Period
together with all such previous and further extensions thereof may not exceed 20
consecutive  quarters.  Payments  of  accrued  Distributions  will be payable to
Holders as they appear on the books and records of the Trust on the first record
date  after  the  end of the  Extension  Period.  Upon  the  termination  of any
Extension  Period and the payment of all amounts then due, the Debenture  Issuer
may commence a new Extension Period, subject to the above requirements.

     The   Preferred   Securities   shall  be  redeemable  as  provided  in  the
Declaration.

     The Preferred  Securities  shall be convertible into shares of Common Stock
of Vanstar  Corporation,  through (i) the exchange of Preferred Securities for a
portion of the Debentures and (ii) the immediate  conversion of such  Debentures
into Common  Stock of Vanstar  Corporation,  in the manner and  according to the
terms set forth in the Declaration.


                                      A1-5









                               CONVERSION REQUEST


To:  Wilmington Trust Company
     as Property Trustee of
     Vanstar Financing Trust



     The undersigned  owner of these  Preferred  Securities  hereby  irrevocably
exercises the option to convert these Preferred Securities, or the portion below
designated,  into  Common  Stock of VANSTAR  CORPORATION  (the  "Vanstar  Common
Stock") in accordance with the terms of the Amended and Restated  Declaration of
Trust (the "Declaration"), dated as of October 2, 1996, by John J. Dunican, Jr.,
as Regular Trustee,  Wilmington Trust Company,  as Delaware Trustee,  Wilmington
Trust Company, as Property Trustee, Vanstar Corporation,  as Sponsor, and by the
Holders,  from time to time, of individual  beneficial interests in the Trust to
be issued pursuant to the Declaration.  Pursuant to the aforementioned  exercise
of the option to convert these  Preferred  Securities,  the  undersigned  hereby
directs the Conversion Agent (as that term is defined in the Declaration) to (i)
exchange such Preferred Securities for a portion of the Debentures (as that term
is  defined  in the  Declaration)  held by the  Trust  (at the rate of  exchange
specified in the terms of the Preferred  Securities  set forth as Annex I to the
Declaration)  and (ii)  immediately  convert such  Debentures,  on behalf of the
undersigned,  into Vanstar Common Stock (at the conversion rate specified in the
terms of the Preferred Securities set forth as Annex I to the Declaration).
     The  undersigned  does also  hereby  direct the  Conversion  Agent that the
shares  issuable and  deliverable  upon  conversion,  together with any check in
payment for  fractional  shares,  be issued in the name of and  delivered to the
undersigned, unless a different name has been indicated in the assignment below.
If shares are to be issued in the name of a person  other than the  undersigned,
the undersigned will pay all transfer taxes payable with respect thereto.










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     Any holder,  upon the exercise of its conversion  rights in accordance with
the terms of the Declaration and the Preferred Securities, agrees to be bound by
the terms of the Registration  Rights  Agreement  relating to the Vanstar Common
Stock issuable upon conversion of the Preferred Securities.

Date:__________________, ____

      in whole ___                   in part ___

                                     Number of Preferred Securities to be
                                     converted:

                                     ------------------------------------------
                                     If  a  name  or   names   other   than  the
                                     undersigned,  please indicate in the spaces
                                     below the name or names in which the shares
                                     of Vanstar  Common  Stock are to be issued,
                                     along with the address or addresses of such
                                     person or persons:

                                     ------------------------------------------
                                     ------------------------------------------
                                     ------------------------------------------
                                     ------------------------------------------
                                     ------------------------------------------
                                     ------------------------------------------
                                     ------------------------------------------
                                     Signature (for conversion only)

                                     Please Print or Typewrite Name and Address,
                                     Including Zip Code, and Social  Security or
                                     Other Identifying Number:
                                     ------------------------------------------
                                     ------------------------------------------
                                     ------------------------------------------
                                      Signature Guarantee:*
                                                           -------------------
- ------------------------
     *    Signature  Guarantee:(Signature  must be  guaranteed  by an  "eligible
          guarantor institution" that is, a bank, stockbroker,  savings and loan
          association or credit union meeting the requirements of the Registrar,
          which   requirements   include  membership  or  participation  in  the
          Securities  Transfer Agents Medallion  Program ("STAMP") or such other
          "signature guarantee program" as may be determined by the Registrar in
          addition to, or in substitution for,


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                                 ASSIGNMENT FORM


     To assign this Preferred Security, fill in the form below:
     (I) or (we) assign and transfer this Preferred Security to
- -------------------------------------------------------------------------------
               (Insert assignee's social security or tax I.D. no.)
- -------------------------------------------------------------------------------
              (Print or type assignee's name, address and zip code)
and irrevocably  appoint________________________________________________________
agent to transfer this Preferred Security on the books of the Company. The agent
may substitute another to act for him.

                              Your Signature:
                                             --------------------------------
                              (Sign exactly as your name appears on the other
                              side of this Security)

                              Date:
                                   ------------------------------------------
                              Signature Guarantee:
                                                  ---------------------------
[Include the following if the Preferred Security bears a Restricted Securities 
Legend --

In connection with any transfer of any of the Preferred  Securities evidenced by
this certificate,  the undersigned  confirms that such Preferred  Securities are
being:

CHECK ONE BOX BELOW

     (1) / / exchanged for the undersigned's  own account without  transfer;  or
     (2) / / transferred pursuant to and in compliance with Rule 144A under
               the Securities Act of 1933; or

- ------------------------
     STAMP,  all in  accordance  with the  Securities  Exchange Act of 1934,  as
amended.)

   ** Signature must be guaranteed by a commercial bank, trust company or member
firm of the NYSE.


                                     A1-8








     (3) / /   transferred  pursuant to and in compliance  with Regulation S
               under the Securities Act of 1933; or
     (4) / /   transferred  pursuant to another available exemption from the
               registration requirements of the Securities Act of 1933; or
     (5) / /   transferred  pursuant  to an  effective  Shelf  Registration
               Statement.

Unless one of the boxes is checked,  the Trustee  will refuse to register any of
the Preferred Securities evidenced by this certificate in the name of any person
other than the registered Holder thereof; PROVIDED,  HOWEVER, that if box (3) or
(4) is checked, the Trustee may require,  prior to registering any such transfer
of the  Preferred  Securities  such  legal  opinions,  certifications  and other
information  as the  Company  has  reasonably  requested  to  confirm  that such
transfer is being made pursuant to an exemption  from,  or in a transaction  not
subject to, the registration requirements of the Securities Act of 1933, such as
the exemption provided by Rule 144 under such Act.


                                        -------------------------------------
                                        Signature
Signature Guarantee:*

- ----------------------------------      -------------------------------------]
Signature must be guaranteed            Signature

- -----------------------------------------------------------------------------

             [TO BE COMPLETED BY PURCHASER IF (2) ABOVE IS CHECKED.
     The  undersigned  represents  and  warrants  that  it  is  purchasing  this
Preferred  Security  for its own account or an account  with respect to which it
exercises  sole  investment  discretion  and that it and any such  account  is a
"qualified  institutional  buyer"  within  the  meaning  of Rule 144A  under the
Securities  Act of  1933,  and is aware  that  the  sale to it is being  made in
reliance on Rule 144A and  acknowledges  that it has received  such  information
regarding the Company as the undersigned has requested  pursuant to Rule 144A or
has  determined  not to request such  information  and that it is aware that the
transferor is relying upon the undersigned's foregoing  representations in order
to claim the exemption from registration provided by Rule 144A.

Dated:------------------------     ------------------------------------------
                                   NOTICE:  To be executed by an executive
                                   officer.]

- ---------------------
     *Signature must be guaranteed by a commercial bank, trust company or member
firm of the NYSE.


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