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                                                                    Exhibit 4.10


                                  $300,000,000

                               EMULEX CORPORATION

           1.75% CONVERTIBLE SUBORDINATED NOTES DUE FEBRUARY 1, 2007

                          REGISTRATION RIGHTS AGREEMENT


                                                                January 29, 2002

CREDIT SUISSE FIRST BOSTON CORPORATION
THOMAS WEISEL PARTNERS LLC
c/o CREDIT SUISSE FIRST BOSTON CORPORATION
    Eleven Madison Avenue
    New York, New York 10010-3629

Ladies and Gentlemen:

        Emulex Corporation, a Delaware corporation (the "COMPANY"), proposes to
issue and sell to Credit Suisse First Boston Corporation ("CSFBC") and Thomas
Weisel Partners LLC (collectively, the "INITIAL PURCHASERS"), upon the terms set
forth in a purchase agreement of even date herewith (the "PURCHASE AGREEMENT"),
$300,000,000 aggregate principal amount (plus up to an additional $45,000,000
principal amount issuable upon exercise of a 30 day over-allotment option) of
its 1.75% Convertible Subordinated Notes Due February 1, 2007 (the "INITIAL
SECURITIES"). The Initial Securities will be convertible into shares of common
stock, par value $.10 per share, of the Company (the "COMMON STOCK") at the
conversion price set forth in the Confidential Offering Circular dated January
24, 2002. The Initial Securities will be issued pursuant to an Indenture, dated
as of January 29, 2002 (the "INDENTURE"), between the Company and State Street
Bank and Trust Company of California, N.A., as trustee (the "TRUSTEE"). As an
inducement to the Initial Purchasers to enter into the Purchase Agreement, the
Company agrees with the Initial Purchasers as set forth in this Registration
Rights Agreement (the "AGREEMENT"), for the benefit of (i) the Initial
Purchasers and (ii) the holders of the Initial Securities and the Common Stock
issuable upon conversion of the Initial Securities (collectively, the
"SECURITIES") from time to time until such time as such Securities have been
sold pursuant to a Shelf Registration Statement (as defined below) (each of the
forgoing a "HOLDER" and collectively the "HOLDERS"), as follows:

        1. Shelf Registration. (a) The Company shall, at its cost, prepare and,
as promptly as practicable (but in no event more than ninety (90) days after the
first date of


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original issuance of the Initial Securities (the "ISSUE DATE")) file with the
Securities and Exchange Commission (the "COMMISSION") and thereafter use all
commercially reasonable efforts to cause to be declared effective as soon as
practicable a registration statement on Form S-3 (or other appropriate form)
(the "SHELF REGISTRATION STATEMENT") relating to the offer and sale of the
Transfer Restricted Securities (as defined in Section 5 hereof) by the Holders
thereof from time to time in accordance with the methods of distribution set
forth in the Shelf Registration Statement and Rule 415 under the Securities Act
of 1933, as amended (the "SECURITIES ACT") (hereinafter, the "SHELF
REGISTRATION"); provided, however, that no Holder (other than an Initial
Purchaser) shall be entitled to have the Securities held by it covered by such
Shelf Registration Statement unless such Holder (i) agrees in writing (in a form
reasonably acceptable to the Company) to be bound by all the provisions of this
Agreement applicable to such Holder, and (ii) completes and delivers to the
Company the form of Selling Security Holder Notice and Questionnaire (the
"NOTICE AND QUESTIONNAIRE") attached as Annex A to the final Confidential
Offering Memorandum utilized in connection with the sale of the Initial
Securities.

        (b) The Company shall use all commercially reasonable efforts to keep
the Shelf Registration Statement continuously effective in order to permit the
prospectus included therein (the "PROSPECTUS") to be lawfully delivered by the
Holders of the relevant Securities, for a period of two (2) years (or for such
longer period if extended pursuant to Section 2(h) below) from the date of its
effectiveness or such shorter period that will terminate when (i) all the
Securities covered by the Shelf Registration Statement have been sold pursuant
thereto, or (ii) all the Securities covered by the Shelf Registration Statement
that are held by persons other than affiliates of the Company as defined in the
Securities Act are eligible to be sold to the public pursuant to Rule 144(k)
under the Securities Act, or any successor rule thereof (in any such case, such
period being called the "SHELF REGISTRATION PERIOD"). The Company shall be
deemed not to have used all commercially reasonable efforts to keep the Shelf
Registration Statement effective during the requisite period if it voluntarily
takes any action that would result in Holders of Securities covered thereby not
being able to offer and sell such Securities during that period, unless such
action is (i) required by applicable law or (ii) taken by the Company in good
faith and contemplated by Section 2(b)(v) below, and the Company thereafter
complies with the requirements of Section 2(h).

        (c) Notwithstanding any other provisions of this Agreement to the
contrary, the Company shall cause the Shelf Registration Statement and the
Prospectus and any amendment or supplement thereto, as of the effective date of
the Shelf Registration Statement, amendment or supplement, (i) to comply in all
material respects with the applicable requirements of the Securities Act and the
rules and regulations of the Commission and (ii) not to contain any untrue
statement of a material fact or omit to state a material fact required to be
stated therein or necessary in order to make the statements therein, in light of
the circumstances under which they were made, not misleading.


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        2. Registration Procedures. In connection with the Shelf Registration
contemplated by Section 1 hereof, the following provisions shall apply:

        (a) The Company shall (i) furnish to CSFBC at least three (3) business
days prior to the filing thereof with the Commission, a copy of the Shelf
Registration Statement and each amendment thereof and each supplement, if any,
to the prospectus included therein and, in the event that CSFBC (with respect to
any portion of an unsold allotment from the original offering) is participating
in the Shelf Registration Statement, shall use its reasonable best efforts to
reflect in each such document, when so filed with the Commission, such comments
as CSFBC reasonably may propose; and (ii) include the names of the Holders who
propose to sell Securities pursuant to the Shelf Registration Statement (and who
return the Notice and Questionnaire required by Section 1(a) of this Agreement)
as selling securityholders.

        (b) The Company shall give written notice to the Initial Purchasers and
the Holders of the Securities (which notice pursuant to clauses (ii)-(v) hereof
shall be accompanied by an instruction to suspend the use of the Prospectus
until the requisite changes have been made):

               (i) when the Shelf Registration Statement or any amendment
        thereto has been filed with the Commission and when the Shelf
        Registration Statement or any post-effective amendment thereto has
        become effective;

               (ii) of any request by the Commission for amendments or
        supplements to the Shelf Registration Statement or the prospectus
        included therein or for additional information;

               (iii) of the issuance by the Commission of any stop order
        suspending the effectiveness of the Shelf Registration Statement or the
        initiation of any proceedings for that purpose;

               (iv) of the receipt by the Company or its legal counsel of any
        notification with respect to the suspension of the qualification of the
        Securities for sale in any jurisdiction or the initiation or threatening
        of any proceeding for such purpose; and

               (v) of the happening of any event that requires the Company to
        make changes in the Shelf Registration Statement or the Prospectus in
        order that the Shelf Registration Statement or the Prospectus does not
        contain an untrue statement of a material fact nor omit to state a
        material fact required to be stated therein or necessary to make the
        statements therein (in the case of the Prospectus, in light of the
        circumstances under which they were made) not misleading.


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        (c) The Company shall make every reasonable effort to obtain the
withdrawal at the earliest possible time, of any order suspending the
effectiveness of the Shelf Registration Statement.

        (d) The Company shall furnish to each Holder of Securities included
within the coverage of the Shelf Registration, without charge, at least one copy
of the Shelf Registration Statement and any post-effective amendment thereto,
including financial statements and schedules, and, if the Holder so requests in
writing, all exhibits thereto (including those, if any, incorporated by
reference).

        (e) The Company shall, during the Shelf Registration Period, deliver to
each Holder of Securities included within the coverage of the Shelf
Registration, without charge, as many copies of the Prospectus (including each
preliminary prospectus) included in the Shelf Registration Statement and any
amendment or supplement thereto as such person may reasonably request. The
Company consents, subject to the provisions of this Agreement, to the use of the
Prospectus or any amendment or supplement thereto by each of the selling Holders
of the Securities in connection with the offering and sale of the Securities
covered by the Prospectus, or any amendment or supplement thereto, included in
the Shelf Registration Statement.

        (f) Prior to any public offering of the Securities pursuant to the Shelf
Registration Statement, the Company shall register or qualify or cooperate with
the Holders of the Securities included therein and their respective counsel in
connection with the registration or qualification of the Securities for offer
and sale under the securities or "blue sky" laws of such states of the United
States as any Holder of the Securities reasonably requests in writing and do any
and all other acts or things necessary or advisable to enable the offer and sale
in such jurisdictions of the Securities covered by such Registration Statement;
provided, however, that the Company shall not be required to (i) qualify
generally to do business in any jurisdiction where it is not then so qualified
or (ii) take any action which would subject it to general service of process or
to taxation in any jurisdiction where it is not then so subject.

        (g) The Company shall cooperate with the Holders of the Securities to
facilitate the timely preparation and delivery of certificates representing the
Securities to be sold pursuant to any Registration Statement free of any
restrictive legends and in such denominations and registered in such names as
the Holders may request a reasonable period of time prior to sales of the
Securities pursuant to the Shelf Registration Statement.

        (h) Upon the occurrence of any event contemplated by paragraphs (ii)
through (v) of Section 2(b) above during the period for which the Company is
required to maintain an effective Shelf Registration Statement, the Company
shall promptly prepare and file a post-effective amendment to the Shelf
Registration Statement or an amendment or supplement to the Prospectus and any
other required document so that, as thereafter delivered to Holders or
purchasers of the Securities, the Prospectus will not contain an


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untrue statement of a material fact or omit to state any material fact required
to be stated therein or necessary to make the statements therein, in light of
the circumstances under which they were made, not misleading. If the Company
notifies the Initial Purchasers and the Holders in accordance with paragraphs
(ii) through (v) of Section 2(b) above to suspend the use of the Prospectus
until the requisite changes to the Prospectus have been made, then the Initial
Purchasers and the Holders shall suspend use of such Prospectus (the period of
such suspension being referred to as a "DEFERRAL PERIOD"), and the period of
effectiveness of the Shelf Registration Statement provided for in Section 1(b)
above shall be extended by the number of days from and including the date of the
giving of such notice to and including the date when the Initial Purchasers and
the Holders shall have received such amended or supplemented prospectus pursuant
to this Section 2(h).

        (i) Not later than the effective date of the Shelf Registration
Statement, the Company will provide CUSIP numbers for the Initial Securities and
the Common Stock registered under the Shelf Registration Statement, and provide
the Trustee with printed certificates for the Initial Securities, in a form
eligible for deposit with The Depository Trust Company.

        (j) The Company will comply with all rules and regulations of the
Commission to the extent and so long as they are applicable to the Shelf
Registration and will make generally available to its security holders (or
otherwise provide in accordance with Section 11(a) of the Securities Act) an
earnings statement satisfying the provisions of Section 11(a) of the Securities
Act, no later than 45 days after the end of a 12-month period (or 90 days, if
such period is a fiscal year) beginning with the first month of the Company's
first fiscal quarter commencing after the effective date of the Shelf
Registration Statement, which statement shall cover such 12-month period.

        (k) The Company shall cause the Indenture to be qualified under the
Trust Indenture Act of 1939, as amended, (the "TRUST INDENTURE ACT") in a timely
manner and containing such changes, if any, as shall be necessary for such
qualification. In the event that such qualification would require the
appointment of a new trustee under the Indenture, the Company shall appoint a
new trustee thereunder pursuant to the applicable provisions of the Indenture.

        (l) In addition to requiring the timely completion and return of the
Notice and Questionnaire contemplated by Section 1(a) of this Agreement, the
Company may require each Holder of Securities to be sold pursuant to the Shelf
Registration Statement to furnish to the Company such information regarding the
Holder and the distribution of the Securities as the Company may from time to
time reasonably require for inclusion in the Shelf Registration Statement, and
the Company may exclude from such registration the Securities of any Holder that
unreasonably fails to furnish such information within a reasonable time after
receiving such request.


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        (m) The Company shall enter into such customary agreements (including,
if requested and subject to the provisions of Section 7 of this Agreement, an
underwriting agreement in customary form) and take all such other actions, if
any, as any Holder shall reasonably request in order to facilitate the
disposition of the Securities pursuant to the Shelf Registration.

        (n) The Company shall (i) make reasonably available for inspection by
the Holders, any underwriter participating in any disposition pursuant to the
Shelf Registration Statement and any attorney, accountant or other agent
retained by the Holders or any such underwriter, all relevant financial and
other records, pertinent corporate documents and properties of the Company and
(ii) cause the Company's officers, directors, employees, accountants and
auditors to supply all relevant information reasonably requested by the Holders
or any such underwriter, attorney, accountant or agent in connection with the
Shelf Registration Statement, in each case, as shall be reasonably necessary to
enable such persons, to conduct a reasonable investigation within the meaning of
Section 11 of the Securities Act; provided, however, that the foregoing
inspection and information gathering shall be coordinated on behalf of the
Initial Purchasers by you and on behalf of the other parties, by one counsel
designated by and on behalf of such other parties as described in Section 3
hereof; and provided further, that any information that is designated by the
Company, in good faith, as confidential at the time of delivery of such
information shall be kept confidential by the Holders or any such underwriter,
attorney, accountant or agent, unless such disclosure is made in connection with
a court proceeding or required by law, or such information becomes available to
the public generally through a third-party without an accompanying obligation of
confidentiality.

        (o) In connection with any underwritten offering of Transfer Restricted
Securities (as defined in Section 5(f) below) in accordance with Section 7 of
this Agreement, the Company, if reasonably requested by any Holder of Securities
covered by the Shelf Registration Statement, shall cause (i) its counsel to
deliver an opinion and updates thereof relating to the Securities in customary
form addressed to such Holders and the managing underwriters, if any, thereof,
and dated, in the case of the initial opinion, the effective date of such Shelf
Registration Statement (it being agreed that such opinion shall be subject to
customary assumptions and exceptions and that the matters to be covered by such
opinion shall include, without limitation, the due incorporation and good
standing of the Company and its significant subsidiaries; the qualification of
the Company and its significant subsidiaries to transact business as foreign
corporations; the due authorization, execution and delivery of the relevant
agreement of the type referred to in Section 2(m) hereof; the due authorization,
execution, authentication and issuance, and the validity and enforceability, of
the Securities; the absence of material legal or governmental proceedings
involving the Company and its subsidiaries; the absence of governmental
approvals required to be obtained in connection with the Shelf Registration
Statement, the offering and sale of the Securities, or any agreement of the type
referred to in Section 2(m) hereof; the compliance as to form of the Shelf
Registration Statement and any documents incorporated by reference therein and
of the Indenture with the


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requirements of the Securities Act and the Trust Indenture Act, respectively;
and, as of the date of the opinion and as of the effective date of the Shelf
Registration Statement or most recent post-effective amendment thereto, as the
case may be, the absence from the Shelf Registration Statement and the
prospectus included therein, as then amended or supplemented, and from any
documents incorporated by reference therein of an untrue statement of a material
fact or the omission to state therein a material fact required to be stated
therein or necessary to make the statements therein not misleading (in the case
of any such documents, in the light of the circumstances existing at the time
that such documents were filed with the Commission under the Exchange Act of
1934, as amended (the "EXCHANGE ACT")); (ii) its officers to execute and deliver
all customary documents and certificates and updates thereof requested by any
underwriters of the Securities and (iii) its independent public accountants and
the independent public accountants with respect to any other entity for which
financial information is provided in the Shelf Registration Statement to provide
to the selling Holders of the applicable Securities and any underwriter therefor
a comfort letter in customary form and covering matters of the type customarily
covered in comfort letters in connection with primary underwritten offerings,
subject to receipt of appropriate documentation as contemplated, and only if
permitted, by Statement of Auditing Standards No. 72.

        (p) The Company will use commercially reasonable efforts to (a) if the
Initial Securities have been rated prior to the initial sale of such Initial
Securities, confirm such ratings will apply to the Securities covered by a
Registration Statement, or (b) if the Initial Securities were not previously
rated, cause the Securities covered by a Registration Statement to be rated with
the appropriate rating agencies, if so requested by holders of a majority in
aggregate principal amount of Securities covered by the Shelf Registration
Statement, or by the managing underwriters, if any.

        (q) In the event that any broker-dealer registered under the Exchange
Act shall underwrite any Securities or participate as a member of an
underwriting syndicate or selling group or "assist in the distribution" (within
the meaning of the Conduct Rules (the "RULES") of the National Association of
Securities Dealers, Inc. ("NASD")) thereof, whether as a Holder of such
Securities or as an underwriter, a placement or sales agent or a broker or
dealer in respect thereof, or otherwise, the Company will assist such
broker-dealer in complying with the requirements of such Rules, including,
without limitation, by (i) if such Rules, including Rule 2720, shall so require,
engaging a "qualified independent underwriter" (as defined in Rule 2720) on
commercially reasonable terms but at the expense of the Holders whose Securities
are being sold pursuant to such offering, to participate in the preparation of
the Shelf Registration Statement relating to such Securities, to exercise usual
standards of due diligence in respect thereto and, if any portion of the
offering contemplated by such Registration Statement is an underwritten offering
or is made through a placement or sales agent, to recommend the yield of such
Securities, (ii) indemnifying any such qualified independent underwriter to the
extent of the indemnification of underwriters provided in Section 5


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hereof and (iii) providing such information to such broker-dealer as may be
required in order for such broker-dealer to comply with the requirements of the
Rules.

        (r) The Company shall cause all Securities covered by the Shelf
Registration Statement to be listed on each securities exchange on which any
Securities are listed.

        (s) The Company shall use its reasonable efforts to take all other steps
necessary to effect the registration of the Securities covered by a Registration
Statement contemplated hereby.

        3. Registration Expenses. (a) All expenses incident to the Company's
performance of and compliance with this Agreement will be borne by the Company,
regardless of whether a Registration Statement is ever filed or becomes
effective, including without limitation;

               (i) all registration and filing fees and expenses (including
        filings made by any Initial Purchasers or Holder with the NASD);

               (ii) all fees and expenses of compliance with federal securities
        and state "blue sky" or securities laws;

               (iii) all expenses of printing (including printing certificates
        for the Securities to be issued and printing of Prospectuses), messenger
        and delivery services and telephone;

               (iv) all fees and disbursements of counsel for the Company;

                (v) all application and filing fees in connection with listing
        the Securities on a national securities exchange or automated quotation
        system pursuant to the requirements hereof; and

               (vi) all fees and disbursements of independent certified public
        accountants of the Company (including the expenses of any special audit
        and comfort letters required by or incident to such performance).

The Company will bear its internal expenses (including, without limitation, all
salaries and expenses of its officers and employees performing legal or
accounting duties), the expenses of any annual audit and the fees and expenses
of any person, including special experts, retained by the Company.

        (b) In connection with the Shelf Registration Statement required by this
Agreement, the Company will reimburse the Initial Purchasers and the Holders of
Securities covered by the Shelf Registration Statement, for the reasonable fees
and disbursements of not more than one counsel, who shall be Morrison & Foerster
LLP or such other counsel as may be designated by the Holders of a majority in
principal amount


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of the Securities covered by the Shelf Registration Statement (provided that
Holders of Common Stock issued upon the conversion of the Initial Securities
shall be deemed to be Holders of the aggregate principal amount of Initial
Securities from which such Common Stock was converted) to act as counsel for the
Holders in connection therewith.

        4. Indemnification. (a) The Company agrees to indemnify and hold
harmless each Holder and each person, if any, who controls such Holder within
the meaning of the Securities Act or the Exchange Act (each Holder, and such
controlling persons are referred to collectively as the "INDEMNIFIED PARTIES")
from and against any losses, claims, damages or liabilities, joint or several,
or any actions in respect thereof (including, but not limited to, any losses,
claims, damages, liabilities or actions relating to purchases and sales of the
Securities) to which each Indemnified Party may become subject under the
Securities Act, the Exchange Act or otherwise, insofar as such losses, claims,
damages, liabilities or actions arise out of or are based upon any untrue
statement or alleged untrue statement of a material fact contained in the Shelf
Registration Statement or prospectus including any document incorporated by
reference therein, or in any amendment or supplement thereto or in any
preliminary prospectus relating to the Shelf Registration, or arise out of, or
are based upon, the omission or alleged omission to state therein a material
fact required to be stated therein or necessary to make the statements therein
not misleading, and shall reimburse, as incurred, the Indemnified Parties for
any legal or other expenses reasonably incurred by them in connection with
investigating or defending any such loss, claim, damage, liability or action in
respect thereof; provided, however, that (i) the Company shall not be liable in
any such case to the extent that such loss, claim, damage or liability arises
out of or is based upon any untrue statement or alleged untrue statement or
omission or alleged omission made in the Shelf Registration Statement or
prospectus or in any amendment or supplement thereto or in any preliminary
prospectus relating to the Shelf Registration in reliance upon and in conformity
with written information pertaining to such Holder and furnished to the Company
by or on behalf of such Holder specifically for inclusion therein and (ii) with
respect to any untrue statement or omission or alleged untrue statement or
omission made in any preliminary prospectus relating to the Shelf Registration
Statement, the indemnity agreement contained in this subsection (a) shall not
inure to the benefit of any Holder from whom the person asserting any such
losses, claims, damages or liabilities purchased the Securities concerned, to
the extent that a prospectus relating to such Securities was required to be
delivered by such Holder under the Securities Act in connection with such
purchase and any such loss, claim, damage or liability of such Holder results
from the fact that there was not sent or given to such person, at or prior to
the written confirmation of the sale of such Securities to such person, a copy
of the final prospectus if the Company had previously furnished copies thereof
to such Holder; provided further, however, that this indemnity agreement will be
in addition to any liability which the Company may otherwise have to such
Indemnified Party. The Company shall also indemnify underwriters, their officers
and directors and each person who controls such underwriters within the meaning
of the Securities Act or the Exchange Act to the same extent as


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provided above with respect to the indemnification of the Holders of the
Securities if requested by such Holders.

        (b) Each Holder, severally and not jointly, will indemnify and hold
harmless the Company, its officers and directors and each person, if any, who
controls the Company within the meaning of the Securities Act or the Exchange
Act from and against any losses, claims, damages or liabilities or any actions
in respect thereof, to which the Company or any such controlling person may
become subject under the Securities Act, the Exchange Act or otherwise, insofar
as such losses, claims, damages, liabilities or actions arise out of or are
based upon any untrue statement or alleged untrue statement of a material fact
contained in the Shelf Registration Statement or prospectus or in any amendment
or supplement thereto or in any preliminary prospectus relating to the Shelf
Registration, or arise out of or are based upon the omission or alleged omission
to state therein a material fact necessary to make the statements therein not
misleading, but in each case only to the extent that the untrue statement or
omission or alleged untrue statement or omission was made in reliance upon and
in conformity with written information pertaining to such Holder and furnished
to the Company by or on behalf of such Holder specifically for inclusion
therein; and, subject to the limitation set forth immediately preceding this
clause, shall reimburse, as incurred, the Company for any legal or other
expenses reasonably incurred by the Company or any such controlling person in
connection with investigating or defending any loss, claim, damage, liability or
action in respect thereof. This indemnity agreement will be in addition to any
liability which such Holder may otherwise have to the Company or any of its
controlling persons.

        (c) Promptly after receipt by an indemnified party under this Section 4
of notice of the commencement of any action or proceeding (including a
governmental investigation), such indemnified party will, if a claim in respect
thereof is to be made against the indemnifying party under this Section 4,
notify the indemnifying party of the commencement thereof; but the omission so
to notify the indemnifying party will not, in any event, relieve the
indemnifying party from any obligations to any indemnified party other than the
indemnification obligation provided in paragraph (a) or (b) above. In case any
such action is brought against any indemnified party, and it notifies the
indemnifying party of the commencement thereof, the indemnifying party will be
entitled to participate therein and, to the extent that it may wish, jointly
with any other indemnifying party similarly notified, to assume the defense
thereof, with counsel reasonably satisfactory to such indemnified party (who
shall not, except with the consent of the indemnified party, be counsel to the
indemnifying party), and after notice from the indemnifying party to such
indemnified party of its election so to assume the defense thereof the
indemnifying party will not be liable to such indemnified party under this
Section 4 for any legal or other expenses, other than reasonable costs of
investigation, subsequently incurred by such indemnified party in connection
with the defense thereof. No indemnifying party shall, without the prior written
consent of the indemnified party, effect any settlement of any pending or
threatened action in respect of which any indemnified party is or could


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have been a party and indemnity could have been sought hereunder by such
indemnified party unless such settlement (i) includes an unconditional release
of such indemnified party from all liability on any claims that are the subject
matter of such action, and (ii) does not include a statement as to or an
admission of fault, culpability or a failure to act by or on behalf of any
indemnified party.

        (d) If the indemnification provided for in this Section 4 is unavailable
or insufficient to hold harmless an indemnified party under subsections (a) or
(b) above, then each indemnifying party shall contribute to the amount paid or
payable by such indemnified party as a result of the losses, claims, damages or
liabilities (or actions in respect thereof) referred to in subsection (a) or (b)
above in such proportion as is appropriate to reflect the relative fault of the
indemnifying party or parties on the one hand and the indemnified party on the
other in connection with the statements or omissions that resulted in such
losses, claims, damages or liabilities (or actions in respect thereof) as well
as any other relevant equitable considerations. The relative fault of the
parties shall be determined by reference to, among other things, whether the
untrue or alleged untrue statement of a material fact or the omission or alleged
omission to state a material fact relates to information supplied by the Company
on the one hand or such Holder or such other indemnified party, as the case may
be, on the other, and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such statement or omission.
The amount paid by an indemnified party as a result of the losses, claims,
damages or liabilities referred to in the first sentence of this subsection (d)
shall be deemed to include any legal or other expenses reasonably incurred by
such indemnified party in connection with investigating or defending any action
or claim which is the subject of this subsection (d). Notwithstanding any other
provision of this Section 4(d), the Holders shall not be required to contribute
any amount in excess of the amount by which the net proceeds received by such
Holders from the sale of the Securities pursuant to the Shelf Registration
Statement exceeds the amount of damages which such Holders have otherwise been
required to pay by reason of such untrue or alleged untrue statement or omission
or alleged omission. No person guilty of fraudulent misrepresentation (within
the meaning of Section 11(f) of the Securities Act) shall be entitled to
contribution from any person who was not guilty of such fraudulent
misrepresentation. For purposes of this paragraph (d), each person, if any, who
controls such indemnified party within the meaning of the Securities Act or the
Exchange Act shall have the same rights to contribution as such indemnified
party and each person, if any, who controls the Company within the meaning of
the Securities Act or the Exchange Act shall have the same rights to
contribution as the Company.

        (e) The agreements contained in this Section 4 shall survive the sale of
the Securities pursuant to the Shelf Registration Statement and shall remain in
full force and effect, regardless of any termination or cancellation of this
Agreement or any investigation made by or on behalf of any indemnified party.

        5. Additional Interest Under Certain Circumstances. (a) Additional
interest (the "ADDITIONAL INTEREST") with respect to the Initial Securities
shall be assessed as follows if


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any of the following events occur (each such event in clauses (i) through (iii)
below being herein called a "REGISTRATION DEFAULT"):

               (i) the Shelf Registration Statement has not been filed with the
        Commission by the 90th day after the Issue Date;

               (ii) the Shelf Registration Statement has not been declared
        effective by the Commission by the 180th day after the Issue Date; or

               (iii) the Shelf Registration Statement is declared effective by
        the Commission but (A) the Shelf Registration Statement thereafter
        ceases to be effective or, (B) the Shelf Registration Statement or the
        Prospectus ceases to be useable in connection with resales of Transfer
        Restricted Securities (as defined below) during the periods specified
        herein because (1) any event occurs as a result of which the Prospectus
        forming part of such Shelf Registration Statement would include any
        untrue statement of a material fact or omit to state any material fact
        necessary to make the statements therein in the light of the
        circumstances under which they were made not misleading, or (2) it shall
        be necessary to amend such Shelf Registration Statement or supplement
        the related prospectus, to comply with the Securities Act or the
        Exchange Act or the respective rules thereunder.

Each of the foregoing will constitute a Registration Default whatever the reason
for any such event and whether it is voluntary or involuntary or is beyond the
control of the Company or pursuant to operation of law or as a result of any
action or inaction by the Commission .

        Additional Interest shall accrue on the Initial Securities over and
above the interest set forth in the title of the Initial Securities from and
including the date on which any such Registration Default shall occur to but
excluding the date on which all such Registration Defaults have been cured, at a
rate of 0.50% per annum (the "ADDITIONAL INTEREST RATE").

        (b) A Registration Default referred to in Section 5(a)(iii) hereof shall
be deemed not to have occurred and be continuing in relation to the Shelf
Registration Statement or the related Prospectus if the Company is proceeding
promptly and in good faith to amend or supplement the Shelf Registration
Statement and related prospectus so as to describe such events as required by
paragraph 2(h) hereof or so as to otherwise cure the Registration Default
referred to in Section 5(a)(iii); provided, however, that in any case if such
Registration Default occurs (i) for a period in excess of 45 days in any 90 day
period or (ii) for an aggregate of 90 days in any 12 month period, Additional
Interest shall be payable in accordance with the above paragraph from the day
such Registration Default occurs until such Registration Default is cured.

        (c) In the event, after the effective date of the Shelf Registration
Statement, a Holder notifies the Company that it desires to be included as a
Selling Stockholder in the


                                       12
<PAGE>

Shelf Registration Statement pursuant to Section 1(a) hereof, and in the process
of amending or supplementing the Shelf Registration Statement and the related
prospectus to include such Holder as a Selling Stockholder, the Securities and
Exchange Commission (the "SEC") notifies the Company in writing (the "Notice")
that the Company is prohibited from including such Holder as a Selling
Stockholder in the Shelf Registration Statement and that the Company must file a
new registration statement with the SEC and recommence the registration process
(the "New Registration Statement") in order to register such Holder's
Securities, the Company will not be deemed to be in Registration Default
pursuant to Section 5(a)(iii) hereof from the date the Company receives the
Notice until the date the New Registration Statement is declared effective by
the SEC; provided, however, that in the event the Company does receive such
Notice, the Company will proceed promptly and in good faith to cause such New
Registration Statement to be declared effective.

        (d) Any amounts of Additional Interest due pursuant to Section 5(a) will
be payable in cash on the regular interest payment dates with respect to the
Initial Securities (as set forth in the Indenture). The amount of Additional
Interest will be determined by multiplying the applicable Additional Interest
Rate by the principal amount of the Initial Securities, further multiplied by a
fraction, the numerator of which is the number of days such Additional Interest
Rate was applicable during such period (determined on the basis of a 360-day
year comprised of twelve 30-day months), and the denominator of which is 360.

        (e) All obligations of the Company set forth in this Section 5 that are
outstanding with respect to any Transfer Restricted Security at the time such
security ceases to be a Transfer Restricted Security shall survive until such
time as all such obligations with respect to such security shall have been
satisfied in full.

        (f) "TRANSFER RESTRICTED SECURITIES" means each Security until (i) the
date on which such Security has been effectively registered under the Securities
Act and disposed of in accordance with the Shelf Registration Statement or (iv)
the date on which such Security is distributed to the public pursuant to Rule
144 under the Securities Act or is saleable pursuant to Rule 144(k) under the
Securities Act.

        6. Rules 144 and 144A. The Company shall use its best reasonable efforts
to file the reports required to be filed by it under the Securities Act and the
Exchange Act in a timely manner and, if at any time the Company is not required
to file such reports, it will, upon the request of any Holder, make publicly
available other information so long as necessary to permit sales of their
Securities pursuant to Rules 144 and 144A. The Company covenants that it will
take such further action as any Holder may reasonably request, all to the extent
required from time to time to enable such Holder to sell Transfer Restricted
Securities without registration under the Securities Act within the limitation
of the exemptions provided by Rules 144 and 144A (including the requirements of
Rule 144A(d)(4)). The Company will provide a copy of this Agreement to
prospective purchasers of Securities identified to the Company by the Initial
Purchasers upon request.


                                       13
<PAGE>

Upon the request of any Holder, the Company shall deliver to such Holder a
written statement as to whether it has complied with such requirements.
Notwithstanding the foregoing, nothing in this Section 6 shall be deemed to
require the Company to register any of its securities pursuant to the Exchange
Act.

        7. Underwritten Registrations. If any of the Transfer Restricted
Securities covered by the Shelf Registration are to be sold in an underwritten
offering, the investment banker or investment bankers and manager or managers
that will administer the offering ("MANAGING UNDERWRITERS") will be selected by
the holders of a majority in aggregate principal amount of such Transfer
Restricted Securities to be included in such offering (provided that holders of
Common Stock issued upon conversion of the Initial Securities shall not be
deemed holders of Common Stock, but shall be deemed to be holders of the
aggregate principal amount of Initial Securities from which such Common Stock
was converted; provided, however, that such Managing Underwriters will be
reasonably acceptable to the Company.

        No person may participate in any underwritten registration hereunder
unless such person (i) agrees to sell such person's Transfer Restricted
Securities on the basis reasonably provided in any underwriting arrangements
approved by the persons entitled hereunder to approve such arrangements and (ii)
completes and executes all questionnaires, powers of attorney, indemnities,
underwriting agreements and other documents reasonably required under the terms
of such underwriting arrangements.

        8. Miscellaneous.

        (a) Remedies. The Company acknowledges and agrees that any failure by
the Company to comply with its obligations under Section 1 hereof may result in
material irreparable injury to the Initial Purchasers or the Holders for which
there is no adequate remedy at law, that it will not be possible to measure
damages for such injuries precisely and that, in the event of any such failure,
the Initial Purchasers or any Holder may obtain such relief as may be required
to specifically enforce the Company's obligations under Sections 1 hereof. The
Company further agrees to waive the defense in any action for specific
performance that a remedy at law would be adequate.

        (b) No Inconsistent Agreements. The Company will not on or after the
date of this Agreement enter into any agreement with respect to its securities
that is inconsistent with the rights granted to the Holders in this Agreement or
otherwise conflicts with the provisions hereof. The rights granted to the
Holders hereunder do not in any way conflict with and are not inconsistent with
the rights granted to the holders of the Company's securities under any
agreement in effect on the date hereof.

        (c) Amendments and Waivers. The provisions of this Agreement may not be
amended, modified or supplemented, and waivers or consents to departures from
the provisions hereof may not be given, except by the Company and the written
consent of the holders of a majority in principal amount of the Transfer
Restricted Securities affected


                                       14
<PAGE>

by such amendment, modification, supplement, waiver or consents (provided that
holders of Common Stock issued upon conversion of Initial Securities shall not
be deemed holders of Common Stock, but shall be deemed holders of the aggregate
principal amount of Initial Securities from which such Common Stock was
converted). Without the consent of the Holder of each Initial Security, however,
no modification may change the provisions relating to the payment of Additional
Interest.

        (d) Notices. All notices and other communications provided for or
permitted hereunder shall be made in writing by hand delivery, first-class mail,
facsimile transmission, or air courier which guarantees overnight delivery:

               (1) if to a Holder of the Securities, at the most current address
        given by such Holder to the Company.

               (2) if to the Initial Purchasers;

                      Credit Suisse First Boston Corporation
                      Eleven Madison Avenue
                      New York, NY 10010-3629
                      Fax No.: (212) 325-8278
                      Attention: Transactions Advisory Group

        with a copy to:

                      Morrison & Foerster LLP
                      755 Page Mill Road
                      Palo Alto, California 94304-1018
                      Fax No.: (650) 494-0792
                      Attention: Justin L. Bastian, Esq.

               (3) if to the Company, at its address as follows:

                      Emulex Corporation
                      3535 Harbor Boulevard
                      Costa Mesa, California 92626
                      Fax No.: (714) 641-0172
                      Attention: Chief Financial Officer

        with a copy to:

                      Jeffer, Mangels, Butler & Marmaro LLP
                      2121 Avenue of the Stars,
                      10th Floor Los Angeles, California 90067


                                       15
<PAGE>

                      Fax No: (310) 203-0567
                      Attention: Robert M. Steinberg, Esq.

        All such notices and communications shall be deemed to have been duly
given: at the time delivered by hand, if personally delivered; three business
days after being deposited in the mail, postage prepaid, if mailed; when receipt
is acknowledged by recipient's facsimile machine operator, if sent by facsimile
transmission; and on the day delivered, if sent by overnight air courier
guaranteeing next day delivery.

        (e) Third Party Beneficiaries. The Holders shall be third party
beneficiaries to the agreements made hereunder between the Company, on the one
hand, and the Initial Purchasers, on the other hand, and shall have the right to
enforce such agreements directly to the extent they may deem such enforcement
necessary or advisable to protect their rights or the rights of Holders
hereunder.

        (f) Successors and Assigns. This Agreement shall inure to the benefit of
and be binding upon the successors and assigns of each of the parties, including
without limitation and without the need for an express assignment, subsequent
Holders of Transfer Restricted Securities.

        (g) Counterparts. This Agreement may be executed in any number of
counterparts and by the parties hereto in separate counterparts, each of which
when so executed shall be deemed to be an original and all of which taken
together shall constitute one and the same agreement.

        (h) Headings. The headings in this Agreement are for convenience of
reference only and shall not limit or otherwise affect the meaning hereof.

        (i) Governing Law. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO PRINCIPLES
OF CONFLICTS OF LAWS.

        By the execution and delivery of this Agreement, the Company submits to
the nonexclusive jurisdiction of any federal or state court in the State of New
York.

        (j) Severability. If any one or more of the provisions contained herein,
or the application thereof in any circumstance, is held invalid, illegal or
unenforceable, the validity, legality and enforceability of any such provision
in every other respect and of the remaining provisions contained herein shall
not be affected or impaired thereby.

        (k) Securities Held by the Company. Whenever the consent or approval of
Holders of a specified percentage of principal amount of Securities is required
hereunder, Securities held by the Company or its affiliates (other than
subsequent Holders of Securities if such subsequent Holders are deemed to be
affiliates solely by reason of their


                                       16
<PAGE>

holdings of such Securities) shall not be counted in determining whether such
consent or approval was given by the Holders of such required percentage.










                            [Signature page follows]



                                       17
<PAGE>

        If the foregoing is in accordance with your understanding of our
agreement, please sign and return to the Company a counterpart hereof, whereupon
this instrument, along with all counterparts, will become a binding agreement
among the several Initial Purchasers and the Company in accordance with its
terms.

                                        Very truly yours,

                                        EMULEX CORPORATION


                                        By: _________________________________


The foregoing Registration
Rights Agreement is hereby confirmed
and accepted as of the date first
above written.

CREDIT SUISSE FIRST BOSTON CORPORATION
THOMAS WEISEL PARTNERS LLC

By: CREDIT SUISSE FIRST BOSTON CORPORATION


By: ______________________________________
      John Metz, Director




                                       18