SUN MICROSYSTEMS INC
S-3, 1999-06-18
ELECTRONIC COMPUTERS
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<PAGE>   1
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JUNE 18, 1999
                                                       REGISTRATION NO. 333-____
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                             SUN MICROSYSTEMS, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

             DELAWARE                                    94-2805249
  (STATE OR OTHER JURISDICTION OF                      (I.R.S. EMPLOYER
  INCORPORATION OR ORGANIZATION)                       IDENTIFICATION NO.)

                              901 SAN ANTONIO ROAD
                           PALO ALTO, CALIFORNIA 94303
                                 (650) 960-1300
                        (ADDRESS, INCLUDING ZIP CODE, AND
                           TELEPHONE NUMBER, INCLUDING
                           AREA CODE, OF REGISTRANT'S
                          PRINCIPAL EXECUTIVE OFFICES)

                                SCOTT G. MCNEALY
                             SUN MICROSYSTEMS, INC.
                              901 SAN ANTONIO ROAD
                           PALO ALTO, CALIFORNIA 94303
                                 (650) 960-1300
            (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
                   INCLUDING AREA CODE, OF AGENT FOR SERVICE)

                                   COPIES TO:
                               JOHN A. FORE, ESQ.
           WILSON SONSINI GOODRICH & ROSATI, PROFESSIONAL CORPORATION
                               650 PAGE MILL ROAD
                           PALO ALTO, CALIFORNIA 94304
                                 (650) 493-9300

            APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE
               PUBLIC: From time to time after the effective date
                         of this Registration Statement.

    If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. [ ]

    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [X]

    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [ ] _______________

    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, please check the following box and list the Securities
Act registration statement number of the earlier effective registration
statement for the same offering. [ ] ________________


    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]

                         CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>

                                                        PROPOSED MAXIMUM  PROPOSED MAXIMUM
                                                         OFFERING PRICE    OFFERING PRICE        AMOUNT OF
TITLE OF EACH CLASS OF SECURITIES TO BE REGISTERED          (1)(2)            PER UNIT       REGISTRATION FEE
- --------------------------------------------------      ----------------  ----------------   ----------------
<S>                                                      <C>              <C>                <C>
Common Stock, $0.00067 par value(3).................           --                --                 --
Preferred Stock, $0.001 par value...................           --                --                 --
Debt Securities.....................................           --                --                 --
Total(4)............................................     $3,000,000,000       100%(5)            $834,000
</TABLE>

(1)     Or (i) if any Debt Securities are issued at an original issue discount,
        such greater principal amount as shall result in an aggregate initial
        offering price equal to the amount to be registered or (ii) if any Debt
        Securities are issued with a principal amount denominated in a foreign
        currency or composite currency, such principal amount as shall result in
        an aggregate initial offering price equivalent thereto in United States
        dollars at the time of initial offering.



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<PAGE>   2

(2)     These figures are estimates made solely for the purpose of calculating
        the registration fee pursuant to Rule 457(o). Exclusive of accrued
        interest, if any, on the Debt Securities and accrued dividends, if any,
        on the Preferred Stock.

(3)     Each share of Common Stock registered hereby shall include the
        associated right to purchase one one-thousandth of a share of Series A
        Participating Preferred Stock of the Company.

(4)     Pursuant to Rule 429, securities having an aggregate initial offering
        price of $1,000,000,000 are being carried forward from Registration
        Statement No. 333-38021. $303,031 of the filing fee previously paid in
        connection with such registration statement is associated with these
        securities.

(5)     The proposed maximum offering price per unit will be determined by us in
        connection with the issuance of the Securities.

        THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE SEC, ACTING PURSUANT TO SAID SECTION 8(a), MAY
DETERMINE.
================================================================================



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<PAGE>   3


THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. WE MAY
NOT SELL THE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER
TO SELL THESE SECURITIES AND IS NOT SOLICITING AN OFFER TO BUY THESE SECURITIES
IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.

                   SUBJECT TO COMPLETION, DATED JUNE __, 1999

PROSPECTUS

                                 $4,000,000,000

                             SUN MICROSYSTEMS, INC.

                       BY THIS PROSPECTUS, WE MAY OFFER --

                                  COMMON STOCK
                                 PREFERRED STOCK
                                 DEBT SECURITIES

                SEE "RISK FACTORS" ON PAGE 7 FOR INFORMATION YOU SHOULD CONSIDER
        BEFORE BUYING THE SECURITIES.

                                   ----------

                We will provide specific terms of these securities in
        supplements to this prospectus. You should read this prospectus and any
        supplement carefully before you invest.

                                   ----------

                This prospectus may not be used to offer and sell securities
        unless accompanied by a prospectus supplement.

                                   ----------

                NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE
        SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR
        DETERMINED IF THIS PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY
        REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.







                       This prospectus is dated ___, 1999




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<PAGE>   4

                                     SUMMARY

        This prospectus is part of a registration statement that we filed with
the SEC utilizing a "shelf" registration process. Under this shelf process, we
may, from time to time, sell in one or more offerings up to a total dollar
amount of $4,000,000,000 of any combination of the following securities:

        -       shares of our common stock,

        -       shares of our preferred stock, and

        -       our debt securities

        This prospectus provides you with a general description of the
securities we may offer. Each time we sell securities, we will provide a
prospectus supplement that will contain specific information about the terms of
that offering, including the specific amounts, prices and terms of the
securities offered. The prospectus supplement may also add, update or change
information contained in this prospectus. You should read both this prospectus
and any prospectus supplement together with additional information described
below under the heading "Where You Can Find More Information."

SUN MICROSYSTEMS, INC.

        We were originally incorporated in California in February 1982. In
September 1986, we were reincorporated in Delaware. Our principal executive
offices are located at 901 San Antonio Road, Palo Alto, California 94303. Our
telephone number is (650) 960-1300.

COMMON STOCK

        We may issue shares of common stock. Common stockholders are entitled to
receive dividends declared by the Board of Directors, subject to rights of
preferred stock holders. Currently, we do not pay a dividend. Each holder of
common stock is entitled to one vote per share. The holders of common stock have
no preemptive rights.

PREFERRED STOCK

        We may issue up to 10,000,000 shares of preferred stock under our
certificate of incorporation, without further stockholder action, in one or more
series. We will determine the dividend, voting, and conversion rights, and other
provisions at the time of sale.

DEBT SECURITIES

        We may offer unsecured general obligations in the form of either senior
or subordinated debt. The senior debt securities and the subordinated debt
securities are together referred to in this prospectus as the "debt securities".
The senior debt securities will have the same rank as all of our other
unsecured, unsubordinated debt. The subordinated debt securities will be
entitled to payment only after payment on our senior debt. Senior debt generally
includes all indebtedness for money borrowed by us, except indebtedness that is
stated to be not senior to, or to have the same rank as, or is expressly junior
to the subordinated debt securities.

        The senior and subordinated debt will be issued under separate
indentures between us and The Bank of New York, as trustee. We have summarized
the general features of the debt from the indentures. We encourage you to read
the indentures which are exhibits to our Registration Statement No. (333-______)
and our annual report on Form 10-K, and quarterly reports on Form 10-Q, in each
case, as amended. Instructions on how you can get copies of these documents are
provided below under the heading "Where You Can Find More Information."

        GENERAL INDENTURE  PROVISIONS THAT APPLY TO SENIOR AND SUBORDINATED DEBT

        -       Neither indenture limits the amount of debt that we may issue or
                provides holders any protection should there be a highly
                leveraged transaction involving our company.


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<PAGE>   5

        -       The indentures generally allow us to merge or to consolidate
                with another U.S. company or convey, transfer or lease our
                properties and assets substantially as an entirety to another
                U.S. company, so long as the successor assumes our obligations
                under the indentures and immediately after giving effect to the
                transaction we are not in default under the indentures. If these
                events occur, the other company will be required to assume our
                responsibilities on the debt, and we will be released from all
                liabilities and obligations, except in the case of a lease.

        -       The indentures provide that holders of a majority of the total
                principal amount of the debt outstanding in any series may vote
                to change our obligations or your rights concerning the debt.
                But to change the payment of principal, interest, or adversely
                effect the right to convert or certain other matters, every
                holder in that series must consent.

        -       We may discharge the indentures and defease restrictive
                covenants by depositing sufficient funds with the trustee to pay
                the obligations when due, as long as we are not in default under
                the indentures at that time. All amounts due to you on the debt
                would be paid by the trustee from the deposited funds.

        EVENTS OF DEFAULT

        The following are the events of default under the indentures:

        -       Principal not paid when due,

        -       Sinking fund payment not made when due,

        -       Failure to pay interest for 30 days,

        -       Covenants not performed for 90 days after notice,

        -       Bankruptcy, insolvency or reorganization, and

        -       Any other event of default in the indenture.

        REMEDY

        Upon an event of default, other than a bankruptcy, insolvency or
reorganization, the trustee or holders of 25% of the principal amount
outstanding in a series may declare principal immediately payable. However, the
holders of a majority in principal amount may rescind this action.

        GENERAL INDENTURE PROVISIONS THAT APPLY ONLY TO SENIOR DEBT SECURITIES

        The indenture relating to the senior debt securities contains covenants
restricting our ability to incur secured debt and our ability to sell or
transfer our property to a lender or investor, which then, either directly or
indirectly, leases the property back to us.

        GENERAL INDENTURE PROVISIONS THAT APPLY ONLY TO SUBORDINATED DEBT
        SECURITIES

        The subordinated debt securities will be subordinated to all senior
debt.



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<PAGE>   6
                       WHERE YOU CAN FIND MORE INFORMATION

        We file annual, quarterly and special reports, proxy statements and
other information with the SEC. You may read and copy materials that we have
filed with the SEC, including the registration statement, at the following SEC
reference rooms:

<TABLE>
<S>                                   <C>                              <C>
     450 Fifth Street, N.W.             7 World Trade Center           500 West Madison Street
            Room 1024                        Suite 1300                      Suite 1400
      Washington, DC 20549            New York, New York 10048         Chicago, Illinois 60661
</TABLE>

        Our common stock is quoted on the Nasdaq National Market under the
symbol "SUNW," and our SEC filings can also be read at the following Nasdaq
address:

                                Nasdaq Operations
                               1735 K Street, N.W.
                             Washington, D.C. 20006

        The SEC allows us to "incorporate by reference" the information we filed
with them, which means that we can disclose important information by referring
you to those documents. The information incorporated by reference is an
important part of this prospectus, and information that we file later with the
SEC will automatically update and supersede this information. We incorporate by
reference the documents listed below:

        -       Our Annual Report on Form 10-K for our fiscal year ended June
                30, 1998, filed with the SEC on September 25, 1998, which we
                amended by filing an amendment on Form 10-K/A with the SEC on
                June 15, 1999.

        -       Our Quarterly Reports on Form 10-Q for the:

                --      quarter ended September 27, 1998, filed with the SEC on
                        November 10, 1998;

                --      quarter ended December 27, 1998, filed with the SEC on
                        February 9, 1999, which we amended by filing an
                        amendment on Form 10-Q/A with the SEC on June 15, 1999;
                        and

                --      quarter ended and March 28, 1999, filed with the SEC on
                        May 5, 1999.

        -       The description of our common stock contained in our
                registration statement on Form 8-A, filed with the SEC on
                October 24, 1986, including any amendments or reports filed for
                the purpose of updating that description.

        -       The description of our share purchase rights contained in our
                registration statement on Form 8-A filed with the SEC on May 22,
                1999, and any amendments or reports filed for purpose of
                updating that description.

        In addition to the documents listed above, we also incorporate by
reference any future filings we make with the SEC under Sections 13(a), 13(c),
14 or 15(d) of the Securities Exchange Act of 1934, until we have sold all of
the offered securities to which this prospectus relates or the offering is
otherwise terminated.

        You may request a copy of these filings, at no cost, by writing us at
the following address or telephoning us at (650) 960-1300 between 8 a.m. and
5:00 p.m., California local time:

                          Investor Relations Department
                             Sun Microsystems, Inc.
                              901 San Antonio Road
                           Palo Alto, California 94303

        You should rely only on the information incorporated by reference or
provided in this prospectus or any prospectus supplement. We have not authorized
anyone else to provide you with different information. We are not making an
offer of these securities in any state where the offer is not permitted. You
should not assume the information in this prospectus or any prospectus
supplement is accurate as of any date other than the date on the front of those
documents.



                                       6
<PAGE>   7

                                  RISK FACTORS

        You should consider carefully the specific risks set forth under the
caption "Risk Factors" in the prospectus supplement before making an investment
decision.

        IF WE ARE UNABLE TO COMPETE EFFECTIVELY WITH EXISTING OR NEW
COMPETITORS, OUR RESULTING LOSS OF COMPETITIVE POSITION COULD RESULT IN PRICE
REDUCTIONS, FEWER CUSTOMER ORDERS, REDUCED REVENUES, REDUCED MARGINS AND LOSS OF
MARKET SHARE.

        We compete in the hardware and software products and services markets.
These markets are intensely competitive. If we fail to compete successfully in
these markets, the demand for our products would decrease. Any reduction in
demand could lead to a decrease in the prices of our products, reduced revenues,
reduced margins and loss of market share. These competitive pressures
could seriously harm our business and operating results.

        Our competitors are some of the largest, most successful companies in
the world. They include HP, IBM, Compaq and EMC. Our future competitive
performance depends on a number of factors, including our ability to:

        -       continually develop and introduce new products and services with
                better prices and performance than offered by our competitors;

        -       offer a wide range of solutions from small single-processor
                systems to large complex enterprise-level systems;

        -       offer solutions to customers that operate effectively within a
                computing environment that includes hardware and software from
                multiple vendors;

        -       offer products that are reliable and that ensure the security of
                data and information;

        -       create products for which third party software vendors will
                develop a wide range of applications; and

        -       offer high quality products and services.


        We also compete with systems manufacturers and resellers of systems
based on microprocessors from Intel and Windows NT operating system software
from Microsoft. These competitors include Dell, HP and Compaq, in addition to
Intel and Microsoft. This competition creates increased pressure, including
pricing pressure, on our workstation and lower-end server product lines. We
expect this competitive pressure to intensify considerably during our fiscal
year 2000 with the anticipated releases of new software products from Microsoft
and new microprocessors from Intel.

        The computer systems that we sell are made up of many components,
including workstations, servers, storage products, microprocessors and the
Solaris(TM) operating system. In addition, we sell some of these components
separately and as add-ons to installed systems. Over the last two years, we have
invested significantly in our storage products business with a view to
increasing the sales of these products both on a stand-alone basis to customers
using the systems of our competitors and as part of the systems that we sell.
The intelligent storage products business is intensely competitive. EMC is
currently the market leader in this market. To the extent we are unable to
penetrate this market and compete effectively, our business and operating
results could be seriously harmed.

        If we are unable to offer products and services that compete
successfully with the products and services offered by our competitors or that
meet the complex needs of our customers, our business and operating results
could be seriously harmed. In addition, if in responding to competitive
pressures, we are forced to lower the prices of our products and services and we
are unable to reduce our component costs or improve operating efficiencies, our
business and operating results would be seriously harmed.

        THE PRODUCTS WE MAKE ARE VERY COMPLEX AND IF WE ARE UNABLE TO RAPIDLY
AND SUCCESSFULLY DEVELOP AND INTRODUCE NEW PRODUCTS, WE WILL NOT BE ABLE TO
SATISFY CUSTOMER DEMAND.

        We must quickly develop, introduce and deliver in quantity new complex
systems, software and hardware products and components including our Ultra
SPARC(TM) microprocessors, Solaris operating system and intelligent storage
products. The development process for these complicated products is very
uncertain. It requires high levels of innovation from both our product



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<PAGE>   8
designers and our suppliers of the components used in our products. The
development process is also lengthy and costly. If we fail to accurately
anticipate our customers' needs and technological trends, we will be unable to
introduce new products into the market on a timely basis and our business and
operating results would be adversely affected.

        The manufacture and introduction of our new hardware and software
products is also a complicated process. Once we have developed a new product we
face the following challenges in the manufacturing process:

        -       We must be able to manufacture new products in high enough
                volumes so that we can have an adequate supply of new products
                to meet customer demand;

        -       We must be able to manufacture the new products at acceptable
                costs. This requires us to be able to accurately forecast
                customer demand so that we can procure the appropriate
                components at optimal costs. Forecasting demand requires us to
                predict order volumes, the correct mixes of our software and
                hardware products and the correct configurations of these
                products;

        -       We must also manage new product introductions so that we can
                minimize the impact of customers delaying purchases of existing
                products in anticipation of the new product release. We must
                also try to reduce the levels of older product inventories to
                minimize inventory write-offs; and

        -       We may also decide to adjust prices of our existing products
                during this process in order to try to increase customer demand
                for these products. If we are introducing new products at the
                same time or shortly after the price adjustment, this will
                complicate our ability to anticipate customer demand for our new
                products.

If we were unable to timely develop, manufacture and introduce new products in
sufficient quantity to meet customer demand at acceptable costs or if we were
unable to correctly anticipate customer demand for our new products, our
business and operating results could be significantly harmed.

OUR RELIANCE ON SINGLE SOURCE SUPPLIERS COULD DELAY PRODUCT SHIPMENTS AND
INCREASE OUR COSTS

        We depend on many suppliers for the necessary parts and components to
manufacture our products. There are a number of vendors producing the parts and
components that we need. However, there are some components that can only be
purchased from a single vendor due to price, quality or technology reasons. For
example, we depend on Sony for various monitors and on Texas Instruments for our
SPARC microprocessors. If we were unable to purchase the necessary parts and
components from a particular vendor and we had to find a new supplier for such
parts and components, our new and existing product shipments could be delayed,
severely affecting our business and operating results.

OUR FUTURE OPERATING RESULTS DEPEND ON OUR ABILITY TO PURCHASE A SUFFICIENT
AMOUNT OF COMPONENTS TO MEET THE DEMANDS OF OUR CUSTOMERS

        We depend heavily on our suppliers to timely design, manufacture and
deliver the necessary components for our products. While many of the components
we purchase are standard, we do purchase some components, specifically color
monitors and custom memory integrated circuits such as SRAMS and VRAMS, that
require long lead times to manufacture and deliver. Long lead times make it
difficult for us to plan component inventory levels in order to meet the
customer demand for our products. In addition, in the past, we have experienced
shortages in certain of our components (specifically DRAMS and SRAMS). If a
component delivery from a supplier is delayed, if we experience a shortage in
one or more components or if we are unable to provide for the necessary
component inventory levels, our new and existing product shipments could be
delayed and our business and operating results could suffer.

        SINCE WE ORDER OUR COMPONENTS (AND IN SOME CASES COMMIT TO PURCHASE)
FROM SUPPLIERS IN ADVANCE OF RECEIPT OF CUSTOMER ORDERS FOR OUR PRODUCTS WHICH
INCLUDE THESE COMPONENTS, WE FACE A SUBSTANTIAL INVENTORY RISK.

        As part of our component inventory planning, we frequently pay certain
suppliers well in advance of receipt of customer orders. For example, we often
enter into noncancelable purchase commitments with vendors early in the
manufacturing process of our microprocessors to make sure we have enough of
these components for our new products to meet customer demand. Because the
design and manufacturing process for these components is very complicated it is
possible that we could experience a design or manufacturing flaw that could
delay or even prevent the production of the components for which we have
previously committed to pay. We also face the risk of ordering too many
components, or conversely, not enough components, since the orders are based on
the



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<PAGE>   9
forecasts of customer orders rather than actual orders. If we cannot change or
be released from the noncancelable purchase commitments, we could incur
significant costs from the purchase of unusable components, due to a delay in
the production of the components or as a result of inaccurately predicting
component orders in advance of customer orders. Our business and operating
results could be seriously harmed as a result of these increased costs.

DELAYS IN PRODUCT DEVELOPMENT OR CUSTOMER ACCEPTANCE AND IMPLEMENTATION OF NEW
PRODUCTS AND TECHNOLOGIES COULD SERIOUSLY HARM OUR BUSINESS

        Delays in product development and customer acceptance and implementation
of new products could seriously harm our business. Delays in the development and
introduction of our products may occur for various reasons including the
following:

        -       Delays in software development could delay shipments of related
                new hardware products. Generally, the computer systems we sell
                to customers incorporate hardware and software products that we
                sell, such as the UltraSPARC microprocessor, the Solaris
                operating system and intelligent storage products. Any delay in
                the development of the software and hardware included in our
                systems, could delay our shipment of these systems.

        -       If customers decided to delay the adoption and implementation of
                new releases of our Solaris operating system this could also
                delay customer acceptance of new hardware products tied to that
                release. Adopting a new release of an operating system requires
                a great deal of time and money for a customer to convert its
                systems to the new release. The customer must also work with
                software vendors who port their software applications to the new
                operating system and make sure these applications will run on
                the new operating system. As a result, customers may decide to
                delay their adoption of a new release of an operating system
                because of the cost of a new system and the effort involved to
                implement it. Also, customers may wait to implement new systems
                until after January 1, 2000 so that there is less likelihood of
                Year 2000 computer problems.

        IF WE ARE UNABLE TO CONTINUE GENERATING SUBSTANTIAL REVENUES FROM
INTERNATIONAL SALES OUR BUSINESS COULD BE SUBSTANTIALLY HARMED.

        Currently, approximately half of our revenues come from international
sales. Our ability to sell our products internationally is subject to the
following risks:

        -       general economic and political conditions in each country could
                adversely affect demand for our products and services in these
                markets, as recently occurred in certain Asian and Latin
                American markets.

        -       currency exchange rate fluctuations could result in lower demand
                for our products as well as currency translation losses (as well
                as gains).

        -       changes to and compliance with a variety of foreign laws and
                regulations may increase our cost of doing business in these
                jurisdictions.

        -       trade protection measures and import and export licensing
                requirements subject us to additional regulation, may prevent us
                from shipping products to a particular market and increases our
                operating costs.

WE EXPECT OUR QUARTERLY REVENUES AND OPERATING RESULTS TO FLUCTUATE FOR A NUMBER
OF REASONS

        Future operating results will continue to be subject to quarterly
fluctuations based on a wide variety of factors including:

        -       Seasonality. Our operating results are usually lower in the
                first and third quarters of each fiscal year due to customer
                buying patterns for hardware and software products and services.

        -       Increases in Operating Expenses. Our operating expenses will
                continue to increase as we continue to expand our operations.
                Our operating results could suffer if our revenues do not
                increase at least as fast as our expenses.



                                       9
<PAGE>   10
        -       Acquisitions/Alliances. If, in the future, we acquire
                technologies, products or businesses, or we form alliances with
                companies requiring technology investments or revenue
                commitments (such as our recent alliance with AOL), we will face
                a number of risks to our business. The risks we may encounter
                include those associated with integrating or co-managing
                operations, personnel, and technologies acquired or licensed,
                and the potential for unknown liabilities of the acquired or
                combined business. Also, we will include amortization expense of
                acquired intangible assets in our financial statements for
                several years following these acquisitions. Our business and
                operating results on a quarterly basis cold be harmed if our
                acquisition or alliance activities are not successful.

        -       Significant Customers. One of our customers accounted for more
                than 10% of our revenues in fiscal 1998. Our business could
                suffer if this customer or another significant customer
                terminated its business relationship with us or significantly
                reduced the amount of business it did with us.

OUR FAILURE OR THE FAILURE OF OUR BUSINESS PARTNERS AND CUSTOMERS TO BE YEAR
2000 COMPLIANT COULD HARM OUR BUSINESS

        -       We cannot be sure that we will be able to successfully modify on
                a timely basis our products, services and systems to comply with
                Year 2000 requirements. Our business could suffer if we fail to
                make our products and services Year 2000 compliant in time.

        -       We cannot be sure that our current products do not contain
                undetected errors or defects associated with Year 2000 functions
                that may result in material costs to us.

        -       Our expenses may increase if we need to upgrade or perform other
                remediation on products that our customers are using that are
                not Year 2000 compliant. However, we do not believe we are
                legally responsible, other than as provided in our limited
                warranties, for the costs incurred by our customers to become
                Year 2000 compliant.

        -       We are in the process of developing contingency plans to deal
                with potential year 2000 problems. We hope that these
                contingency plans will be completed during the first quarter of
                our fiscal year 2000. If these plans are not timely completed or
                if they are not successful, our business and operating results
                may be seriously harmed.

        -       Our business may suffer if customers become dissatisfied with
                our products and services as a result of Year 2000 issues.

        -       Our business could be harmed if customers delay purchasing our
                products during the first half of our fiscal year 2000 because
                of year 2000 concerns, or if customers who do place orders
                are unable to pay us because of their own year 2000 problem.

        -       Our business could suffer if any of our suppliers or the
                suppliers of others whom we do business with cannot timely
                provide us with products, services or systems that meet the Year
                2000 requirements. A reasonably likely worst case scenario would
                be if one of our major vendors experienced a material disruption
                in business, which caused us to experience a material disruption
                in our business.

        -       If either our internal systems or the internal systems, products
                or services of one or more of our major vendors (including
                banks, energy suppliers and transportation providers) fail to
                achieve Year 2000 compliance, our business could be harmed.

        -       A significant amount of litigation may arise out of Year 2000
                compliance issues and we cannot be sure as to the extent we may
                be affected by any of this litigation. Even though we do not
                believe that we are legally responsible for our customer's Year
                2000 compliance obligations, it is unclear whether different
                governments or governmental agencies may decide to allocate
                liability relating to Year 2000 compliance to us without regard
                to specific warranties or warranty disclaimers. Our business
                could suffer in any given quarter if any liability is allocated
                to us.

        -       We do not know how customer spending patterns may be affected by
                Year 2000 issues. As customers focus on preparing their
                businesses for the Year 2000, capital budgets may be spent on
                remediation efforts, potentially delaying the purchase and
                implementation of new systems, and thereby creating less demand
                for our products and services.

        A significant disruption of our financial management and control systems
or a lengthy interruption in our operations caused by a Year 2000 related issue
could result in a material adverse impact on our operating results and financial
condition. In addition, it is possible that a supplier's failure to ensure Year
2000 capability or our customer's concerns about Year 2000 readiness of our
products would have a material adverse effect on our results of operations.



                                       10
<PAGE>   11
OUR ACQUISITION AND ALLIANCE ACTIVITIES COULD DISRUPT OUR ONGOING BUSINESS.

        We intend to continue to make investments in  companies, products and
technologies, either through acquisitions or investment alliances. For example,
we have purchased several  companies in the past and formed alliances, including
our recent alliance with AOL. Acquisitions and alliance activities often involve
risks, including:

        -       we may experience difficulty in assimilating the acquired
                operations and employees;

        -       we may experience difficulty in managing product co-development
                activities with our alliance partners.

        -       we may be unable to retain the key employees of the acquired
                operation;

        -       the acquisition or investment may disrupt our ongoing business;

        -       we may not be able to incorporate successfully the acquired
                technology and operations into our business and maintain uniform
                standards, controls, policies and procedures; and

        -       we may lack the experience to enter into new markets, products
                or technologies.

        Some of these factors are beyond our control. Failure to manage these
alliance activities effectively and to integrate acquisitions would affect our
operating results or financial condition.

WE DEPEND ON KEY EMPLOYEES AND FACE COMPETITION IN HIRING AND RETAINING
QUALIFIED EMPLOYEES.

        Our employees are vital to our success, and our key management,
engineering and other employees are difficult to replace. We generally do not
have employment contracts with our key employees. Further, we do not maintain
key person life insurance on any of our employees. The expansion of high
technology companies in Silicon Valley and Colorado, as well as many other
cities, has increased demand and competition for qualified personnel. We may not
be able to attract, assimilate or retain additional highly qualified employees
in the future. These factors could harm our business.



                                       11
<PAGE>   12

                                 USE OF PROCEEDS

        Unless otherwise indicated in the applicable prospectus supplement,
we anticipate that any net proceeds from the sale of  securities offered by
this prospectus will be used to fund expansion of our business, including
for:

        -       additional working capital,

        -       capital expenditures,

        -       acquisitions of products, technologies and businesses, and

        -       general corporate purposes.

When we offer a particular series of securities offered by this prospectus, the
prospectus supplement relating to that offering will set forth the intended use
of the net proceeds received from that offering. Pending the application of the
net proceeds, we expect to invest the proceeds from the sale of offered
securities in interest-bearing securities.


                       RATIO OF EARNINGS TO FIXED CHARGES

        The ratio of earnings to fixed charges for each of the periods indicated
is as follows:

<TABLE>
<CAPTION>
                                                                                NINE MONTHS ENDED
                                           FISCAL YEAR ENDED JUNE 30,          --------------------
                                  -----------------------------------------    MARCH 29,  MARCH 29,
                                  1994     1995      1996     1997     1998      1998       1999
                                  ----     ----      ----     ----     ----    ---------  ---------
<S>                               <C>      <C>       <C>      <C>      <C>       <C>      <C>
Ratio of earnings to fixed
charges                           5.6x     11.3x     15.1x    21.4x    16.6x     14.7x    17.6x
</TABLE>

        These computations include us and our consolidated subsidiaries. For
these ratios, "earnings" represents income before taxes plus fixed charges.
Fixed charges consists of (1) interest expense discount and expense, (2)
capitalized interest and (3) an interest factor attributable to rentals.


                       DESCRIPTION OF THE DEBT SECURITIES

        The debt securities will either be our senior debt securities or our
subordinated debt securities. The debt securities will be issued under one or
more separate indentures between us and The Bank of New York, as trustee. Senior
debt securities will be issued under a senior indenture and subordinated debt
securities will be issued under a subordinated indenture. Together, the senior
indenture and subordinated indenture are called indentures. The prospectus,
together with its prospectus supplement, will describe all the material terms of
a particular series of debt securities.

        The following is a summary of the most important provisions and
definitions of the indentures. For additional information, you should look at
the applicable indenture that is filed as an exhibit to the registration
statement which includes this prospectus. In this description of the debt
securities, the words "Sun", "we", "us" or "our" refer only to Sun Microsystems,
Inc. and not to any of our subsidiaries.

        GENERAL

        Debt securities may be issued in separate series without limitation as
to aggregate principal amount. We may specify a maximum aggregate principal
amount for the debt securities of any series. We are not limited as to the
amount of debt securities we may issue under the indentures.

        The prospectus supplement will set forth:

        -       whether the debt securities are senior or subordinated,

        -       the offering price,



                                       12
<PAGE>   13

        -       the title,

        -       any limit on the aggregate principal amount,

        -       the person who shall be entitled to receive interest, if other
                than the record holder on the record date,

        -       the date the principal will be payable,

        -       the interest rate, if any, the date interest will accrue, the
                interest payment dates and the regular record dates,

        -       the place where payments shall be made,

        -       any mandatory or optional redemption provisions,

        -       if applicable, the method for determining how principal,
                premium, if any, or interest will be calculated by reference to
                an index or formula,

        -       if other than U.S. currency, the currency or currency units in
                which principal, premium, if any, or interest will be payable
                and whether we or the holder may elect payment to be made in a
                different currency,

        -       the portion of the principal amount that will be payable upon
                acceleration of stated maturity, if other than the entire
                principal amount,

        -       if the principal amount payable at stated maturity will not be
                determinable as of any date prior to stated maturity, the amount
                which will be deemed to be the principal amount,

        -       any defeasance provisions if different from those described
                below under "Satisfaction and Discharge--Defeasance,"

        -       any conversion or exchange provisions,

        -       whether the debt securities will be issuable in the form of a
                global security,

        -       any subordination provisions if different from those described
                below under "Subordinated Debt Securities,"

        -       any deletions of, or changes or additions to, the events of
                default or covenants, and

        -       any other specific terms of such debt securities.

        Unless otherwise specified in the prospectus supplement:

        -       the debt securities will be registered debt securities; and

        -       registered debt securities denominated in U.S. dollars will be
                issued in denominations of $1,000 or an integral multiple of
                $1,000.

        Debt securities may be sold at a substantial discount below their stated
principal amount, bearing no interest or interest at a rate which at time of
issuance is below market rates.

EXCHANGE AND TRANSFER

        Debt securities may be transferred or exchanged at the office of the
security registrar or at the office of any transfer agent designated by us. We
will not impose a service charge for any transfer or exchange, but we may
require holders to pay any tax or other governmental charges associated with any
transfer or exchange.



                                       13
<PAGE>   14

        In the event of any potential redemption of debt securities of any
series, we will not be required to:

        -       issue, register the transfer of, or exchange, any debt security
                of that series during a period beginning at the opening of
                business 15 days before the day of mailing of a notice of
                redemption and ending at the close of business on the day of the
                mailing, or

        -       register the transfer of or exchange any debt security of that
                series selected for redemption, in whole or in part, except the
                unredeemed portion being redeemed in part.

        We have initially appointed the trustee as the security registrar. Any
transfer agent, in addition to the security registrar, initially designated by
us will be named in the prospectus supplement. We may designate additional
transfer agents or change transfer agents or change the office of the transfer
agent. However, we will be required to maintain a transfer agent in each place
of payment for the debt securities of each series.

GLOBAL SECURITIES

        The debt securities of any series may be represented, in whole or in
part, by one or more global securities. Each global security will:

        -       be registered in the name of a depositary that we will identify
                in a prospectus supplement,

        -       be deposited with the depositary or nominee or custodian, and

        -       bear any required legends.

        No global security may be exchanged in whole or in part for debt
securities registered in the name of any person other than the depositary or any
nominee unless:

        -       the depositary has notified us that it is unwilling or unable to
                continue as depositary or has ceased to be qualified to act as
                depositary,

        -       an event of default is continuing, or

        -       any other circumstances described in a prospectus supplement.

        As long as the depositary, or its nominee, is the registered owner of a
global security, the depositary or nominee will be considered the sole owner and
holder of the debt securities represented by the global security for all
purposes under the indentures. Except in the above limited circumstances, owners
of beneficial interests in a global security will not be:

        -       entitled to have the debt securities registered in their names,

        -       entitled to physical delivery of certificated debt securities,
                and

        -       considered to be holders of those debt securities under the
                indenture.

        Payments on a global security will be made to the depositary or its
nominee as the holder of the global security. Some jurisdictions have laws that
require that certain purchasers of securities take physical delivery of such
securities in definitive form. These laws may impair the ability to transfer
beneficial interests in a global security.

        Institutions that have accounts with the depositary or its nominee are
referred to as "participants." Ownership of beneficial interests in a global
security will be limited to participants and to persons that may hold beneficial
interests through participants. The depositary will credit, on its book-entry
registration and transfer system, the respective principal amounts of debt
securities represented by the global security to the accounts of its
participants.



                                       14
<PAGE>   15

        Ownership of beneficial interests in a global security will be shown on
and effected through records maintained by the depositary, with respect to
participants' interests, or any participant, with respect to interests of
persons held by participants on their behalf.

        Payments, transfers and exchanges relating to beneficial interests in a
global security will be subject to policies and procedures of the depositary.
The depositary's policies and procedures may change from time to time. Neither
we nor the trustee will have any responsibility or liability for the
depositary's or any participant's records with respect to beneficial interests
in a global security.

PAYMENT AND PAYING AGENTS

        The provisions of this paragraph will apply to the debt securities
unless otherwise indicated in the prospectus supplement. Payment of interest on
a debt security on any interest payment date will be made to the person in whose
name the debt security is registered at the close of business on the regular
record date. Payment on debt securities of a particular series will be payable
at the office of a paying agent or paying agents designated by us. However, at
our option, we may pay interest by mailing a check to the record holder. The
corporate trust office will be designated as our sole paying agent.

        We may also name any other paying agents in the prospectus supplement.
We may designate additional paying agents, change paying agents or change the
office of any paying agent. However, we will be required to maintain a paying
agent in each place of payment for the debt securities of a particular series.

        All moneys paid by us to a paying agent for payment on any debt security
which remain unclaimed for a period ending the earlier of:

        -       10 business days prior to the date the money would be turned
                over to the state, or

        -       at the end of two years after such payment was due

will be repaid to us. Thereafter, the holder may look only to Sun for such
payment.

CONSOLIDATION, MERGER AND SALE OF ASSETS

        We may not consolidate with or merge into any other person, in a
transaction in which we are not the surviving corporation, or convey, transfer
or lease our properties and assets substantially as an entirety to, any person,
unless:

        -       the successor, if any, is a U.S. corporation, limited liability
                company, partnership, trust or other entity,

        -       the successor assumes our obligations on the debt securities and
                under the indentures,

        -       immediately after giving effect to the transaction, no default
                or event of default shall have occurred and be continuing, and

        -       certain other conditions are met.

EVENTS OF DEFAULT

        Each indenture defines an event of default with respect to any series of
debt securities as one or more of the following events:

        (1) failure to pay principal of or any premium on any debt security of
that series when due,

        (2) failure to pay any interest on any debt security of that series for
30 days when due,

        (3) failure to deposit any sinking fund payment when due,



                                       15
<PAGE>   16

        (4) failure to perform any other covenant in the indenture continued for
90 days after being given the notice required in the indenture,

        (5) our bankruptcy, insolvency or reorganization, and

        (6) any other event of default specified in the prospectus supplement.

        An event of default of one series of debt securities is not necessarily
an event of default for any other series of debt securities.

        If an event of default, other than an event of default described in
clause (5) above, occurs and continues, either the trustee or the holders of at
least 25% in aggregate principal amount of the outstanding securities of that
series may declare the principal amount of the debt securities of that series to
be due and payable immediately. If an event of default described in clause (5)
above occurs, the principal amount of all the debt securities of that series,
will automatically become immediately due and payable. Any payment by us on the
subordinated debt securities following any acceleration will be subject to the
subordination provisions described below under "Subordinated Debt Securities."

        After acceleration the holders of a majority in aggregate principal
amount of the outstanding securities of that series may, under certain
circumstances, rescind and annul such acceleration if all events of default,
other than the non-payment of accelerated principal, or other specified amount,
have been cured or waived.

        Other than the duty to act with the required care during an event of
default, the trustee will not be obligated to exercise any of its rights or
powers at the request of the holders unless the holders offer the trustee
reasonable indemnity. Generally, the holders of a majority in aggregate
principal amount of the outstanding debt securities of any series will have the
right to direct the time, method and place of conducting any proceeding for any
remedy available to the trustee or exercising any trust or power conferred on
the trustee.

        A holder will have the right to begin a proceeding under the indentures,
or for the appointment of a receiver or a trustee, or for any other remedy under
the indentures only if:

        (1) the holder has previously given to the trustee written notice of a
continuing event of default with respect to the debt securities of that series,

        (2) the holders of at least 25% in aggregate principal amount of the
outstanding debt securities of that series have made a written request and have
offered reasonable indemnity to the trustee to begin the proceeding,

        (3) the trustee has not started the proceeding within 60 days after the
request, and

        (4) the trustee has not received direction inconsistent with the
original request from the holders of a majority in aggregate principal amount of
the outstanding debt securities of that series within 60 days after the original
request.

        Holders may, however, sue to enforce the payment of principal, premium
or interest on or after the due date without following the procedures listed in
(1) through (4) above.

        We will furnish the trustee an annual statement by our officers as to
whether or not we are in default in the performance of the indenture and, if so,
specifying all known defaults.

MODIFICATION AND WAIVER

        We and the trustee may make modifications and amendments to the
indentures with the consent of the holders of a majority in aggregate principal
amount of the outstanding securities of each series affected by the modification
or amendment.

        However, neither we nor the trustee may make any modification or
amendment without the consent of the holder of each outstanding security of that
series affected by the modification or amendment if such modification or
amendment would:

        -       change the stated maturity of any debt security,



                                       16
<PAGE>   17

        -       reduce the principal, premium, if any, or interest on any debt
                security,

        -       reduce the principal of an original issue discount security or
                any other debt security payable on acceleration of maturity,

        -       change the place of payment or the currency in which any debt
                security is payable,

        -       impair the right to sue for any payment after the stated
                maturity or redemption date,

        -       if subordinated debt securities, modify the subordination
                provisions in a materially adverse manner to the holders,

        -       adversely affect the right to convert any debt security, or

        -       change the provisions in the indenture that relate to modifying
                or amending the indenture.

SATISFACTION AND DISCHARGE; DEFEASANCE

        We may be discharged from our obligations on the debt securities of any
series that have matured or will mature or be redeemed within one year if we
deposit with the trustee enough cash to pay all the principal, interest and any
premium due to the stated maturity date or redemption date of the debt
securities.

        Each indenture contains a provision that permits us to elect:

        -       to be discharged from all of our obligations, subject to limited
                exceptions, with respect to any series of debt securities then
                outstanding; and/or

        -       to be released from our obligations under the following
                covenants and from the consequences of an event of default
                resulting from a breach of these covenants:

        (1) the limitations on sale and leaseback transactions under the senior
indenture,

        (2) the limitations on secured debt under the senior indenture,

        (3) the subordination provisions under the subordinated indenture, and

        (4) covenants as to payment of taxes and maintenance of properties.

        To make either of the above elections, we must deposit in trust with the
trustee enough money to pay in full the principal, interest and premium on the
debt securities. This amount may be made in cash and/or U.S. government
obligations. As a condition to either of the above elections, we must deliver to
the trustee an opinion of counsel that the holders of the debt securities will
not recognize income, gain or loss for Federal income tax purposes as a result
of the action.

        If we elect to be discharged from all of our obligations as outlined
above in the first bullet point in this section, the holders of the debt
securities of the series will not be entitled to the benefits of the indenture,
except for registration of transfer and exchange of debt securities and
replacement of lost, stolen or mutilated debt securities.

NOTICES

        Notices to holders will be given by mail to the addresses of the holders
in the security register.

GOVERNING LAW

        The indentures and the debt securities will be governed by, and
construed under, the law of the State of New York, without regard to conflicts
of laws principles.



                                       17
<PAGE>   18

REGARDING THE TRUSTEE

        The indentures limit the right of the trustee, should it become a
creditor of Sun, to obtain payment of claims or secure its claims.

        The trustee is permitted to engage in certain other transactions.
However, if the trustee , acquires any conflicting interest, and there is a
default under the debt securities of any series for which they are trustee, the
trustee must eliminate the conflict or resign.

SENIOR DEBT SECURITIES

        The senior debt securities will be unsecured and will rank equally with
all of our other unsecured and non-subordinated senior debt.

        Covenants in the Senior Indenture

        Limitations on Liens. Neither we nor any restricted subsidiary will
issue, incur, create, assume or guarantee any secured debt without securing the
senior debt securities equally and ratably with or prior to that secured debt
unless the total amount of all secured debt that the senior debt securities are
not secured equally and ratably with, would not exceed the greater of $300
million or 15% of our consolidated net tangible assets.

        Limitations on Sale and Lease-back Transactions. Subject to the last
paragraph of this Section, neither we nor any restricted subsidiary will enter
into any lease longer than three years covering any of our principal property or
any restricted subsidiary that is sold to any other person in connection with
that lease unless either:

        (1) we or any restricted subsidiary would be entitled to incur
indebtedness secured by a mortgage on the principal property involved in such
transaction at least equal in amount to the attributable debt with respect to
the lease, without equally and ratably securing the senior debt securities,
pursuant to "Limitation on Liens" described above, or

        (2) an amount equal to the greater of the following amounts is applied
within 180 days to the retirement of our or any restricted subsidiary's
long-term debt or the purchase or development of comparable property:

        -       the net proceeds from the sale; and

        -       the attributable debt with respect to the sale and leaseback
                transaction.

        However, either we or our restricted subsidiaries would be able to enter
into a sale and lease back transaction without being required to apply the net
proceeds from this sale and lease back transaction as required by (2) above if
the sum of the following amounts would not exceed the greater of $300 million or
15% of our consolidated net tangible assets:

        -       the total amount of the sale and leaseback transactions, and

        -       the total amount of secured debt.

        Absence of Certain Covenants. The prospectus supplement will specify any
additional restrictive covenants applicable to the senior debt securities. The
senior indenture does not contain provisions permitting the holders of senior
debt securities to require us to repurchase or redeem the senior debt securities
in the event of a takeover, recapitalization or similar restructuring, highly
leveraged transaction, or downgrading of our debt ratings.

        Definitions

        "attributable debt" with regard to a sale and leaseback transaction
means the lesser of:

        (1) the fair market value of such property as determined in good faith
by our board of directors, or

        (2) discounted present value of all net rentals under the lease.



                                       18
<PAGE>   19

        "consolidated net tangible assets" means total assets, less reserves,
after deducting:

        -       total current liabilities, excluding:

        -       notes and loans payable,

        -       current maturities of long-term debt,

        -       current maturities of capital leases, and

        -       certain intangible assets to the extent included in total
                assets.

        "mortgage" means a mortgage, security interest, pledge, lien, charge or
other encumbrance.

        "Nonrecourse obligation" means indebtedness substantially related to:

        -       acquisition of assets not previously owned by us or any
                restricted subsidiary, or

        -       the financing of any project involving the development of either
                our or any of our restricted subsidiary's property in which the
                only recourse is to the proceeds or the project financed with
                the proceeds of the transaction.

        "principal property" means the land, improvements, buildings and
fixtures owned by us or a restricted subsidiary located in the United States
that constitutes our principal corporate office, any manufacturing plant or any
manufacturing facility and has a book value in excess of .75% of our
consolidated net tangible assets as of the determination date. Principal
property does not include any property that our board of directors has
determined not to be of material importance to the business conducted by us and
our subsidiaries, taken as a whole.

        "restricted subsidiary" means any subsidiary that owns any principal
property. "Restricted subsidiary" does not include:

        -       any subsidiary primarily engaged in financing receivables or in
                the finance business, or

        -       any of our less than 80% owned subsidiaries if the common stock
                of the subsidiary is traded on any national securities exchange
                or quoted on the Nasdaq National Market or over the counter.

        "secured debt" means any of our debt or any debt of a restricted
subsidiary for borrowed money secured by a mortgage on any principal property or
any stock or indebtedness of a restricted subsidiary. Secured debt does not
include:

        -       mortgages on property existing at the time of acquisition of the
                property by us or any subsidiary,

        -       mortgages on property, shares of stock or indebtedness or other
                assets of a corporation existing at the time it becomes a
                restricted subsidiary,

        -       mortgages on property, shares of stock or indebtedness or other
                assets existing at the time of acquisition by us or a restricted
                subsidiary (including leases), or mortgages to secure payment of
                all or any part of the purchase price, or to secure any debt
                within 270 days after the acquisition thereof, or in the case of
                property, the completion of construction, improvement or
                commencement of substantial commercial operation of the
                property,

        -       mortgages to secure indebtedness owing to us or to a restricted
                subsidiary,

        -       mortgages existing at the date of the senior indenture,

        -       mortgages on property existing at the time the person is merged
                or consolidated with us or a restricted subsidiary,




                                       19
<PAGE>   20

        -       mortgages on property at the time of a sale or lease of the
                properties of a person as an entirety or substantially as an
                entirety to us or a restricted subsidiary,

        -       mortgages incurred to finance the acquisition or construction of
                property secured by mortgages in favor of the United States or a
                political subdivision of the Unites States,

        -       mortgages incurred in connection with asset acquisition or a
                project financed with a non-recourse obligation, or

        -       mortgages constituting any extension, renewal or replacement of
                any mortgage listed above to the extent the mortgage is not
                increased.

SUBORDINATED DEBT SECURITIES

        The indebtedness evidenced by the subordinated debt securities is
subordinated to the extent provided in the subordinated indenture to the prior
payment in full of all senior debt, including any senior debt securities.

        Upon any distribution of our assets upon any dissolution, winding up,
liquidation or reorganization, payments on the subordinated debt securities will
be subordinated in right of payment to the prior payment in full of all senior
debt.

        As a result of these subordination provisions, in the event of our
bankruptcy, dissolution or reorganization, holders of Senior debt may receive
more, ratably, and holders of the subordinated debt securities may receive less,
ratably, than our other creditors.

        In the event of any acceleration of the subordinated debt securities
because of an event of default, holders of any senior debt would be entitled to
payment in full in cash of all senior debt before the holders of subordinated
debt securities are entitled to receive any payment or distribution.

        We are required to promptly notify holders of senior debt if payment of
the subordinated debt securities is accelerated because of an event of default.

        We may also not make payment on the subordinated debt securities if:

        -       a default in the payment of senior debt occurs and is
                continuing, or

        -       any other default occurs and is continuing with respect to
                designated senior debt that permits holders or their
                representatives of designated senior debt to accelerate its
                maturity, and the trustee receives a payment blockage notice
                from us or some other person permitted to give the notice under
                the subordinated indenture.

        We may and shall resume payments on, and may purchase or redeem or make
a sinking fund or defeasance payment on, the subordinated debt securities:

        -       in case of a payment default, when the default is cured or
                waived or ceases to exist, and

        -       in case of a nonpayment default, the earlier of when the default
                is cured or waived or ceases to exist or 179 days after the
                receipt of the payment blockage notice if the maturity of the
                designated senior debt has not been accelerated.

        No new payment blockage period may start unless 365 days have elapsed
from the effectiveness of the prior payment blockage notice.

        No nonpayment default that existed or was continuing on the date of
delivery of any payment blockage notice to the trustee shall be the basis for a
subsequent payment blockage notice.

        The subordination provisions will not prevent the occurrence of any
event of default under the subordinated indenture.



                                       20
<PAGE>   21

        If the trustee or any holder receives any payment that should not have
been made to them in contravention of subordination provisions before all senior
debt is paid in full, then such payment will be held in trust for the holders of
senior debt.

        Senior debt securities will constitute senior debt under the
subordinated indenture.

        Definitions

        "designated senior debt" means certain existing senior debt and any of
our other senior debt that expressly provides that it is "designated senior
debt."

        "senior debt" means principal, premium and interest, including
bankruptcy interest, and fees on the following:

        (1)     our indebtedness evidenced by credit or loan agreement, note,
                bond, debenture or other written obligation;

        (2)     our obligations for money borrowed;

        (3)     our obligations evidenced by a note in an acquisition of any
                businesses, properties or assets;

        (4)     capitalized leases;

        (5)     leases for facilities, equipment or related assets for financing
                purposes, as determined by Sun;

        (6)     certain types of off-balance sheet real estate leases;

        (7)     interest rate and currency agreements;

        (8)     letters of credit, bankers' acceptances or similar facilities;

        (9)     obligations issued or assumed as the deferred purchase price of
                property or services, excluding trade accounts payable in the
                ordinary course of business;

        (10)    obligations of the type listed in 1 through 9 above of another
                person and all dividends of another person, which we have either
                assumed or guaranteed or are liable or which is secured by a
                lien on our property; and

        (11)    any renewals or extensions listed in 1 through 10 above.

        However, senior debt shall not include:

        -       subordinated debt securities, or

        -       indebtedness if the terms of the indebtedness expressly provides
                that it is not superior in right of payment to the subordinated
                debt securities.

        "subsidiary" means:

        -       any corporation of which more than 66 2/3% is owned by us or by
                one or more or our other subsidiaries, and

        -       any partnership of which more than 66 2/3% of the equity capital
                or profit interest is owned by us or by one or more of our other
                subsidiaries.



                                       21
<PAGE>   22

                         DESCRIPTION OF PREFERRED STOCK

PREFERRED STOCK

        The following description of preferred stock and the description of the
terms of a particular series of preferred stock that will be set forth in the
related prospectus supplement are not complete. These descriptions are qualified
in their entirety by reference to the certificate of designations relating to
that series. The rights, preferences, privileges and restrictions of the
preferred stock of each series will be fixed by the certificate of designations
relating to that series. The prospectus supplement also will contain a
description of certain United States federal income tax consequences relating to
the purchase and ownership of the series of preferred stock that is described in
the prospectus supplement.

        As of June 18, 1999, there were no shares of preferred stock
outstanding. The Board of Directors has the authority, without further action by
the stockholders, to issue up to 10,000,000 shares of preferred stock in one or
more series and to fix the following terms of the preferred stock:

        -       designations, powers, preferences, privileges,

        -       relative participating, optional or special rights, and

        -       the qualifications, limitations or restrictions, including
                dividend rights, conversion rights, voting rights, terms of
                redemption and liquidation preferences.

Any or all of these rights may be greater than the rights of the common stock.


        In May 1989, we paid a dividend of one share purchase right for each
share of our outstanding common stock. Each right entitles the holder to
purchase from us one one-thousandth of a share of Series A Participating
Preferred Stock at a purchase price of $150.00. The number of rights, the shares
of Series A Participating Preferred Stock that may be purchased under one right
and the purchase price may be adjusted to prevent dilution. We are authorized to
issue up to 3,000,000 shares of our Series A Participating Preferred Stock under
our certificate of incorporation. No shares of Series A Participating Preferred
Stock are outstanding.

        The Board of Directors, without stockholder approval, can issue
preferred stock with voting, conversion or other rights that could negatively
affect the voting power and other rights of the holders of common stock.
Preferred stock could thus be issued quickly with terms calculated to delay or
prevent a change in control of Sun or make it more difficult to remove our
management. Additionally, the issuance of preferred stock may have the effect of
decreasing the market price of the common stock.

        The prospectus supplement will specify:

        -       the maximum number of shares,

        -       the designation of the shares,

        -       the annual dividend rate, if any, whether the dividend rate is
                fixed or variable, the date dividends will accrue, the dividend
                payment dates, and whether dividends will be cumulative,

        -       the price and the terms and conditions for redemption, if any,
                including redemption at our option or at the option of the
                holders, including the time period for redemption, and any
                accumulated dividends or premiums,

        -       the liquidation preference, if any, and any accumulated
                dividends upon the liquidation, dissolution or winding up of
                Sun's affairs,

        -       any sinking fund or similar provision, and, if so, the terms and
                provisions relating to the purpose and operation of the fund,

        -       the terms and conditions, if any, for conversion or exchange of
                shares of any other class or classes of our capital stock or any
                series of any other class or classes, or of any other series of
                the same class, or any other securities or assets, including the
                price or the rate of conversion or exchange and the method, if
                any, of adjustment,

        -       the voting rights, and



                                       22
<PAGE>   23

        -       any or all other preferences and relative, participating,
                optional or other special rights, privileges or qualifications,
                limitations or restrictions.

        Preferred stock will be fully paid and nonassessable upon issuance. The
preferred stock or any series of preferred stock may be represented, in whole or
in part, by one or more global certificates, which will have an aggregate
principal amount equal to that of the preferred stock represented by the global
certificate.

        Each global certificate will:

        -       be registered in the name of a depositary or a nominee of the
                depositary identified in the prospectus supplement,

        -       be deposited with such depositary or nominee or a custodian for
                the depositary, and

        -       bear a legend regarding the restrictions on exchanges and
                registration of transfer and any other matters as may be
                provided for under the certificate of designation.


                              PLAN OF DISTRIBUTION

        We may sell the securities separately or together:

        -       through one or more underwriters or dealers in a public offering
                and sale by them,

        -       directly to investors, or

        -       through agents.

        We may distribute the securities from time to time in one or more
transactions at a fixed price or prices, which may be changed from time to time:

        -       at market prices prevailing at the times of sale,

        -       at prices related to such prevailing market prices, or

        -       at negotiated prices.

        We will describe the method of distribution of the securities in the
prospectus supplement.

        Underwriters, dealers or agents may receive compensation in the form of
discounts, concessions or commissions from us or our purchasers (as their agents
in connection with the sale of securities). These underwriters, dealers or
agents may be considered to be underwriters under the Securities Act. As a
result, discounts, commissions, or profits on resale received by the
underwriters, dealers or agents may be treated as underwriting discounts and
commissions. The prospectus supplement will identify any such underwriter,
dealer or agent, and describe any compensation received by them from us. Any
initial public offering price and any discounts or concessions allowed or
reallowed or paid to dealers may be changed from time to time.

        Underwriters, dealers and agents may be entitled to indemnification by
us against certain civil liabilities, including liabilities under the Securities
Act, or to contribution with respect to payments made by the underwriters,
dealers or agents, under agreements between us and the underwriters, dealers and
agents.

        We may grant underwriters who participate in the distribution of
securities an option to purchase additional securities to cover over-allotments,
if any, in connection with the distribution.

        All preferred stock and debt securities will be new issues of securities
with no established trading market. Underwriters involved in the public offering
and sale of preferred stock and debt securities may make a market in the
preferred stock and debt securities. However, they are not obligated to make a
market and may discontinue market making activity at any time. Therefore, we
cannot give any assurances to you as to the liquidity of the trading market for
any preferred stock or debt securities.



                                       23
<PAGE>   24

        Underwriters or agents and their associates may be customers of, engage
in transactions with or perform services for us in the ordinary course of
business.


                                 LEGAL MATTERS

        The validity of the issuance of our securities offered by this
prospectus will be passed upon for Sun by Wilson Sonsini Goodrich & Rosati,
Professional Corporation, Palo Alto, California.


                                     EXPERTS

        Ernst & Young LLP, independent auditors, have audited our consolidated
financial statements incorporated by reference and schedule included in our
Annual Report on Form 10-K, as amended on Form 10-K/A, for the year ended June
30, 1998, as set forth in their report, which is incorporated by reference in
this prospectus. Our consolidated financial statements and schedule are
incorporated by reference in reliance on Ernst & Young LLP's report, given on
their authority as experts in accounting and auditing.



                                       24
<PAGE>   25

                                     PART II

                   INFORMATION NOT REQUIRED IN THE PROSPECTUS

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

        The aggregate estimated expenses to be paid by the Registrant in
connection with this offering (other than the underwriting discounts and
commissions) are as follows:

<TABLE>
<S>                                                                   <C>
SEC registration fee .............................                    $1,137,031
Trustee's fees and expenses ......................                        75,000
Accounting fees and expenses .....................                       225,000
Legal fees and expenses ..........................                       500,000
Printing and engraving ...........................                       300,000
Blue sky fees and expenses .......................                        10,000
Transfer agent fees and expenses .................                        10,000
Rating agencies' fees                                                  1,345,000
Miscellaneous                                                            197,969
                                                                      ----------
     Total .......................................                    $3,800,000
                                                                      ==========
</TABLE>

ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS

        Section 145 of the General Corporation Law of the State of Delaware, as
amended, provides that under certain circumstances a corporation may indemnify
any person who was or is a party or is threatened to be made a party to any
threatened, pending or completed action, suit or proceeding whether civil,
criminal, administrative or investigative, by reason of the fact that he or she
is or was a director, officer, employee or agent of the Company or is or was
serving at its request in such capacity in another corporation or business
association, against expenses (including attorneys' fees), judgments, fines and
amounts paid in settlement actually and reasonably incurred by him or her in
connection with such action, suit or proceeding if he or she acted in good faith
and in a manner he or she reasonably believed to be in or not opposed to the
best interests of the Company and, with respect to any criminal action or
proceeding, had no reasonable cause to believe his or her conduct was unlawful.

        Section 11 of the Restated Certificate of Incorporation of the
Registrant provides in effect that, subject to certain limited exceptions, the
Registrant shall indemnify its directors and officers to the extent authorized
or permitted by the General Corporation Law of the State of Delaware. The
directors and officers of the Registrant are insured under policies of insurance
maintained by the Company, subject to the limits of the policies, against
certain losses arising from any claims made against them by reason of being or
having been such directors or officers. In addition, the Company has entered
into contracts with certain of its directors providing for indemnification of
such persons by the Registrant to the full extent authorized or permitted by
law, subject to certain limited exceptions.

        The form(s) of proposed underwriting agreement(s) to be filed as (an)
Exhibit(s) hereto or incorporated by reference herein may include provisions
regarding the indemnification of officers and directors of the Registrant by the
several underwriters.

ITEM 16.  EXHIBITS

        The following exhibits are filed herewith or incorporated by reference
herein:

<TABLE>
<CAPTION>
EXHIBIT
NUMBER      EXHIBIT TITLE
- ------      -------------
<S>         <C>
1.1*        Form of Underwriting Agreement.

3.1(1)      Restated Certificate of Incorporation as amended February 12, 1998.

3.2(1)      Bylaws as amended February 11, 1998.

3.3(2)      Certificate of Amendment of the Restated Certificate of
            Incorporation filed March 17, 1999.

3.4(3)      Amended Certificate of Designations filed March 17, 1999.

4.1*        Form of Senior Indenture.

4.2*        Form of Subordinated Indenture.

4.3*        Form of Preferred Stock Certificate.

4.4         Form of Senior Debt Security (included in Exhibit 4.1).
</TABLE>

                                       II-1
<PAGE>   26

<TABLE>
<CAPTION>
EXHIBIT
NUMBER      EXHIBIT TITLE
- ------      -------------
<S>         <C>
4.5         Form of Subordinated Debt Security (included in Exhibit 4.2).

4.6(4)      Second Amended and Restated Shares Rights Agreement dated February
            11, 1998.

4.7(3)      Amendment to Second Amended and Restated Shares Rights Agreement
            dated April 14, 1999.

5.1*        Opinion of Wilson Sonsini Goodrich & Rosati, Professional
            Corporation.

12.1        Computation of Ratio of Earnings to Fixed Charges.

23.1        Consent of Ernst & Young LLP, Independent Auditors.

23.2*       Consent of Wilson Sonsini Goodrich & Rosati, Professional
            Corporation (included in Exhibit 5.1).

24.1        Power of Attorney of certain directors and officers of Sun
            Microsystems, Inc. (see page II-4 of initial filing of this Form
            S-3).

25.1*       Form T-1 Statement of Eligibility of Trustee for Senior Indenture
            under the Trust Indenture Act of 1939.

25.2*       Form T-1 Statement of Eligibility of Trustee for Subordinated
            Indenture under the Trust Indenture Act of 1939.
</TABLE>

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

*       To be filed by amendment or by a report on Form 8-K pursuant to Section
        601 of Regulation S-K.
(1)     Incorporated by reference to Registrant's Quarterly Report on Form 10-Q
        for the quarter ended March 29, 1998.
(2)     Incorporated by reference to Registrant's Quarterly Report on Form 10-Q
        for the Quarter ended March 28, 1999.
(3)     Incorporated by reference to Registrant's Registration Statement on Form
        8-A/A, Amendment No. 7, filed on April 15, 1999.
(4)     Incorporated by reference to Registrant's Registration Statement on Form
        8-A, Amendment No. 6, filed on February 13, 1998.

ITEM 17.  UNDERTAKINGS

        1. The undersigned registrant hereby undertakes:

                (1) To file, during any period in which offers or sales are
        being made, a post-effective amendment to this registration statement:

                        (i) To include any prospectus required by Section
                10(a)(3) of the Securities Act of 1933 (the "Act");

                        (ii) To reflect in the prospectus any facts or events
                arising after the effective date of the registration statement
                (or the most recent post-effective amendment thereof) which,
                individually or in the aggregate, represent a fundamental change
                in the information set forth in the registration statement.
                Notwithstanding the foregoing, any increase or decrease in
                volume of securities offered (if the total dollar value of
                securities offered would not exceed that which was registered)
                and any deviation from the low or high end of the estimated
                maximum offering range may be reflected in the form of
                prospectus filed with the SEC pursuant to Rule 424(b) if, in the
                aggregate, the changes in volume and price represent no more
                than a 20% change in the maximum aggregate offering price set
                forth in the "Calculation of Registration Fee" table in the
                effective registration statement; and

                        (iii) To include any material information with respect
                to the plan of distribution not previously disclosed in the
                registration statement or any material change to such
                information in the registration statement;

provided, however, that the undertakings set forth in clauses (i) and (ii) above
shall not apply if the information required to be included in a post-effective
amendment by these clauses is contained in periodic reports filed by the
registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange
Act of 1934 (the "Exchange Act") that are incorporated by reference in this
registration statement.

                (2) That, for the purpose of determining any liability under the
        Act, each such post-effective amendment shall be deemed to be a new
        registration statement relating to the securities offered therein, and
        the offering of such securities at that time shall be deemed to be the
        initial bona fide offering thereof.

                (3) To remove from registration by means of a post-effective
        amendment any of the securities being registered which remain unsold at
        the termination of the offering.



                                       II-2
<PAGE>   27

        2. The undersigned registrant hereby undertakes, that, for purposes of
determining any liability under the Act, each filing of the registrant's annual
report pursuant to Section 13(a) or Section 15(d) of the Exchange Act that is
incorporated by reference in the Registration Statement shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

        3. Insofar as indemnification for liabilities arising under the Act may
be permitted to directors, officers and controlling persons of the registrant
pursuant to the provisions described under Item 15 above, or otherwise, the
registrant has been advised that in the opinion of the SEC such indemnification
is against public policy as expressed in the Act and is, therefore,
unenforceable. In the event that a claim for indemnification against such
liabilities (other than the payment by the registrant of expenses incurred or
paid by a director, officer or controlling person of the registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.

        4. The undersigned registrant hereby undertakes that:

                (a) For purposes of determining any liability under the Act, the
        information omitted from the form of prospectus filed as part of this
        registration statement in reliance upon Rule 430A and contained in a
        form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or
        (4) or 497(h) under the Act shall be deemed to be part of this
        registration statement as of the time it was declared effective.

                (b) For the purpose of determining any liability under the Act,
        each post-effective amendment that contains a form of prospectus shall
        be deemed to be a new registration statement relating to the securities
        offered therein, and the offering of such securities at that time shall
        be deemed to be the initial bona fide offering thereof.



                                      II-3
<PAGE>   28

                                          SIGNATURES

        Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-3 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Palo Alto, State of California, on June 18, 1999.

                                               SUN MICROSYSTEMS, INC.

                                            By: /s/ Michael E. Lehman
                                               ---------------------------------
                                                      Michael E. Lehman
                                            Vice President, Corporate Resources
                                                 and Chief Financial Officer

        KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints Michael E. Lehman and Scott G. McNealy,
and each of them individually, as his true and lawful attorneys-in-fact and
agents with full power of substitution and resubstitution, for him and in his
name, place and stead, in any and all capacities to sign the Registration
Statement filed herewith and any or all amendments to said Registration
Statement (including post-effective amendments and registration statements filed
pursuant to Rule 462(b) under the Securities Act of 1933, as amended and
otherwise), and to file the same, with all exhibits thereto, and other documents
in connection therewith, with the SEC granting unto said attorneys-in-fact and
agents the full power and authority to do and perform each and every act and
thing requisite and necessary to be done in and about the foregoing, as full to
all intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents or any of them, or his or
her substitute, may lawfully do or cause to be done by virtue thereof.

        Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated:

<TABLE>
<CAPTION>
                     NAME                                         TITLE                            DATE
                     ----                                         -----                            ----
<S>                                            <C>                                            <C>
             /s/  Scott G. McNealy               Chairman of the Board of Directors and       June 18, 1999
  -----------------------------------------        Chief Executive Officer (Principal
                Scott G. McNealy                           Executive Officer)

             /s/  Michael E. Lehman            Vice President and Chief Financial Officer     June 18, 1999
  -----------------------------------------
                Michael E. Lehman                     (Principal Financial Officer)

             /s/  Michael L. Popov                    Vice President and Controller           June 18, 1999
  -----------------------------------------            (Principal Accounting Officer)
               Michael L. Popov

             /s/  James L. Barksdale                            Director                      June 18, 1999
  -----------------------------------------
                James L. Barksdale

             /s/  L. John Doerr                                 Director                      June 18, 1999
  -----------------------------------------
                L. John Doerr

             /s/  Judith L. Estrin                              Director                      June 18, 1999
  -----------------------------------------
                Judith L. Estrin

                                                                Director                      June   , 1999
  -----------------------------------------
                Robert L. Fisher
</TABLE>



                                      II-4
<PAGE>   29

<TABLE>
<S>                                            <C>                                            <C>
             /s/  Robert L. Long                                Director                      June 18, 1999
  -----------------------------------------
                 Robert L. Long

             /s/  M. Kenneth Oshman                             Director                      June 18, 1999
  -----------------------------------------
                M. Kenneth Oshman

             /s/  A. Michael Spence                             Director                      June 18, 1999
  -----------------------------------------
                A. Michael Spence
</TABLE>



                                      II-5
<PAGE>   30

                                  EXHIBIT INDEX
<TABLE>
<CAPTION>
EXHIBIT
NUMBER      EXHIBIT TITLE
- ------      -------------
<S>         <C>
1.1*        Form of Underwriting Agreement.

3.1(1)      Restated Certificate of Incorporation as amended February 12, 1998.

3.2(1)      Bylaws as amended February 11, 1998.

3.3(2)      Certificate of Amendment of the Restated Certificate of
            Incorporation filed March 17, 1999.

3.4(3)      Amended Certificate of Designations filed March 17, 1999.

4.1*        Form of Senior Indenture.

4.2*        Form of Subordinated Indenture.

4.3*        Form of Preferred Stock Certificate.

4.4         Form of Senior Debt Security (included in Exhibit 4.1).

4.5         Form of Subordinated Debt Security (included in Exhibit 4.2).

4.6(4)      Second Amended and Restated Shares Rights Agreement dated February
            11, 1998.

4.7(3)      Amendment to Second Amended and Restated Shares Rights Agreement
            dated April 14, 1999.

5.1*        Opinion of Wilson Sonsini Goodrich & Rosati, Professional
            Corporation.

12.1        Computation of Ratio of Earnings to Fixed Charges.

23.1        Consent of Ernst & Young LLP, Independent Auditors.

23.2*       Consent of Wilson Sonsini Goodrich & Rosati, Professional
            Corporation (included in Exhibit 5.1).

24.1        Power of Attorney of certain directors and officers of Sun
            Microsystems, Inc. (see page II-4 of initial filing of this Form
            S-3).

25.1*       Form T-1 Statement of Eligibility of Trustee for Senior Indenture
            under the Trust Indenture Act of 1939.

25.2*       Form T-1 Statement of Eligibility of Trustee for Subordinated
            Indenture under the Trust Indenture Act of 1939.
</TABLE>

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

*       To be filed by amendment or by a report on Form 8-K pursuant to Section
        601 of Regulation S-K.
(1)     Incorporated by reference to Registrant's Quarterly Report on Form 10-Q
        for the quarter ended March 29, 1998.
(2)     Incorporated by reference to Registrant's Quarterly Report on Form 10-Q
        for the Quarter ended March 28, 1999.
(3)     Incorporated by reference to Registrant's Registration Statement on Form
        8-A/A, Amendment No. 7, filed on April 15, 1999.
(4)     Incorporated by reference to Registrant's Registration Statement on Form
        8-A, Amendment No. 6, filed on February 13, 1998.



                                      II-6

<PAGE>   1

                                                                    EXHIBIT 12.1

                             SUN MICROSYSTEMS, INC.
               COMPUTATION OF RATIOS OF EARNINGS TO FIXED CHARGES
                        (in thousands, except ratio date)


<TABLE>
<CAPTION>
                                                                                                                 MONTHS ENDED
                                                          FISCAL YEAR ENDED JUNE 30,                       ------------------------
                                      ------------------------------------------------------------------    MARCH 28,    MARCH 28,
                                         1994         1995          1996          1997          1998          1998         1999
                                      -----------  -----------   -----------   -----------   -----------   -----------  -----------
<S>                                   <C>          <C>           <C>           <C>           <C>           <C>          <C>
Income Before Income Taxes .........  $   283,379  $   523,298   $   708,874   $ 1,121,207   $ 1,176,166   $   760,760  $ 1,015,948
Fixed Charges ......................       60,577       50,697        49,787        54,820        75,281        55,314       61,091
Less: Effect of Capitalized Interest       (2,075)      (3,341)       (4,893)         (698)       (5,121)       (4,476)      (4,129)
                                      ===========  ===========   ===========   ===========   ===========   ===========  ===========
"Earnings" .........................      341,881      570,654       753,768     1,175,329     1,246,326       811,598    1,072,910
Divided by Fixed Charges ...........       60,577       50,697        49,787        54,820        75,281        55,314       61,091
                                      -----------  -----------   -----------   -----------   -----------   -----------  -----------
Ratio of Earnings to Fixed Charges .         5.6x        11.3x         15.1x         21.4x         16.6x         14.7x        17.6x
                                      ===========  ===========   ===========   ===========   ===========   ===========  ===========
</TABLE>




<PAGE>   1

                                                                    EXHIBIT 23.1

               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

        We consent to the reference to our firm under the caption "Experts" in
the Registration Statement (Form S-3 No. _________) and related Prospectus of
Sun Microsystems, Inc. for the registration of $4,000,000,000 of debt
securities, preferred stock and common stock and to the incorporation by
reference therein of our reports dated July 15, 1998, with respect to the
consolidated financial statements of Sun Microsystems, Inc. incorporated by
reference in its annual report (Form 10-K, as amended on Form 10-K/A) for the
year ended June 30, 1998 and the related financial statement schedule included
therein, filed with the SEC.

                                                               ERNST & YOUNG LLP
Palo Alto, California
June 14, 1999




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