Document:

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                                                                   EXHIBIT 10.73

                                  AMENDMENT #5
                              TO PURCHASE AGREEMENT

This Amendment No. 5 ("the Amendment") to the Purchase Agreement (the
"Agreement") dated January 25, 2000 by and among Brocade Communications Systems,
Inc., a corporation organized under the laws of the State of Delaware, U.S.A.,
and having its principal place of business at 1745 Technology Drive, San Jose,
California 95110 ("Brocade-US"), and Brocade Communications Switzerland SarL., a
corporation organized under the laws of Geneva, and having its principal place
of business at 29-31 Route de l'Aeroport, Case Postale 105 CH-1215 Geneva 15,
Switzerland ("Brocade-Switzerland"), (collectively "SUPPLIER") and EMC
Corporation, ("EMC"), a Massachusetts corporation, is made this 4th day of May
2004 by and between SUPPLIER and EMC and commences on the date accepted and
executed by SUPPLIER ("Effective Date"). [*].

WHEREAS, the parties wish to amend the Agreement to 1) [*] (as more fully
described below), and 2) amend Section 15 of the Agreement ([*]) to more fully
describe [*]by Brocade.

NOW THEREFORE, in consideration of the above and the other respective promises
of the parties set forth herein, the parties agree as follows:

A.    [*]

1. Background. SUPPLIER and EMC have established certain standard [*] and [*]
processes in Amendment [*]to the Agreement (collectively, the [*]);and now wish
to add to and establish certain alternative procedures for [*], and [*] based on
the EMC so-called [*]

2. Section 7.8. The following new SECTION 7.8 is hereby added to the Agreement:

      7.8 [*] Process. The [*]and [*] (the [*]established herein shall be [*]the
          [*] Process. The parties agree to discuss the appropriateness of [*]
          the [*]at quarterly business reviews. EMC may order Products [*]a
          SUPPLIER [*]subject to issuance of [*]and [*]; in which case the
          procedures set forth [*] shall apply. Notwithstanding anything herein
          to the contrary, EMC may continue to [*]pursuant to the [*]provided
          that a [*], (or less if agreed to by the parties), advance
          notification in writing is provided to the SUPPLIER.

        (a) A [*] shall be a [*] Products in a [*] as defined by EMC's [*] EMC
            may [*] the [*] by the [*] solely as required to [*] EMC's remaining
            [*] demand. Such [*] will be made via [*] communicated to Supplier.
            An example for reference purposes only is provided in EXHIBIT [*].
            The [*] uses the following [*] to [*]:

            [*]

            [*] which is made up of Brocade process [*] plus [*]. Brocade
            process [*] is defined as the [*] from [*] Brocade [*] the [*] the
            [*] product is [*] to be [*] by the [*]. [*] is the [*] from [*]to
            [*] at [*].

            [*]which is EMC's [*] quantity divided by [*].

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**CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY WITH
THE SECURITIES AND EXCHANGE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
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            [*],a pre-determined number that [*] may [*]to [*] Currently [*] EMC
            agrees that this [*]will not [*]without the SUPPLIER's mutual
            consent.

            [*]is determined by [*]size and [*].

            Products to be stocked in:

            [*]owned products that are [*]to EMC for [*] in one of the [*] for
            the purpose of [*] EMC's requirements for Products. A "[*] shall
            mean the [*]locations identified in EXHIBIT [*]. The parties may
            mutually agree to amend EXHIBIT [*]. to add or remove [*] from time
            to time.

        (b) Upon execution of this Amendment, EMC will establish a [*]and
            SUPPLIER will [*]products as detailed in EMC's [*]to the [*]sites
            within [*]of [*]of [*]written authorization to do so. EMC will
            maintain a [*]of [*]of [*]. EMC will also issue a [*] which will
            include EMC's [*]that will match EMC's [*]. SUPPLIER will fill in
            its [*]and return the [*]to EMC within [*]. SUPPLIER will make [*]
            available to [*] its supply [*]within the [*]detailed in Paragraph
            [*]below regardless of the [*]of [*]through this [*]. Supplier will
            be [*]on making [*]available per EMC's [*]and actual [*]. EMC will
            communicate [*] to its [*]via the [*]and update its [*]to [*]the [*]
            within [*]of changes to the [*]. Supplier will respond to [*] within
            a maximum of [*]. Supplier will provide [*] updates via the [*]
            between 8pm ET Friday and 12:00 noon ET each [*] that will include
            any changes to Supplier's [*] and [*] "make [*]from the previous
            [*]. SUPPLIER will promptly communicate any [*] in [*] via the [*].
            EMC's [*] is [*] to the following which shall [*] the [*] terms set
            forth in Section [*]of [*]of the Agreement, when the parties are
            utilizing the [*]:

            - [*]of [*]for Products located in [*]and [*]in process that do not
              [*]the [*], which Products [*]is [*]to [*]to [*]using commercially
              reasonable efforts. EMC's [*]such Products shall be [*]using the
              [*]in effect as of the [*]such Products were[*]the Supplier [*].
              [*]will use commercially reasonable efforts to [*]Products and
              [*]be [*]a [*]if SUPPLIER is [*].

            - [*]of EMC [*]detailed in Exhibit P that is [*] the SUPPLIER [*]
              and within [*]calendar days of EMC's purchase order [*].

            - [*]beyond [*]calendar days of EMC's [*]order [*]

            - In the event that EMC's [*]the total amount of [*]in the SUPPLIER
              [*]then the [*]in will be stated in sheet [*]of the [*]. EMC will
              be [*]for the [*]Products detailed in [*] of the [*], per terms
              [*].

        (c) EMC may [*]only complete [*]from a SUPPLIER [*]and shall thereby
            [*]of the applicable [*]to support its [*]. EMC is not required to
            take [*]of SUPPLIER [*]has a customer [*]such Products. These terms
            [*]the [*]terms set forth in Section [*]of [*] of the Agreement,
            when the parties are utilizing the [*]. EMC shall [*]from the
            SUPPLIER [*]on a [*]basis. EMC shall notify SUPPLIER within [*]
            after EMC [*]a complete [*] from a SUPPLIER [*] (each such
            occurrence a [*]), and such notice shall be deemed a [*] for. EMC
            notification will be sent to Brocade by 12:00 noon Eastern time
            every day as

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            needed. The parties agree that [*]notifications will be sent two
            times per day during the [*]business days of the SUPPLIER's [*], one
            by 12:00 noon Eastern time and one by 5 pm Eastern time. If EMC
            [*]material [*]the SUPPLIER [*]during the [*]of SUPPLIER's [*],
            notification will be sent per the previously defined [*]end
            notification schedule above. SUPPLIER shall apply the [*]against the
            then-open [*]. SUPPLIER will [*]Products per [*]and [*]within the
            following [*]:

            - SUPPLIER [*]will be [*]and [*]within [*]business days if product
              is [*]type [*]from [*]or [*]business days if product is [*]type
              [*]from [*], from receipt of EMC's [*]and False [*], if within
              EMC's [*].

            - SUPPLIER [*]will be [*]per SUPPLIER's [*]via the [*], from receipt
              of EMC's [*]if such [*]are in excess of EMC's [*]. If EMC's [*]
              [*]SUPPLIER's current [*]commitment, the SUPPLIER [*]will be
              [*]per the [*]overall [*].

            - An example of a [*]which will be E-mailed to SUPPLIER is provided
              in Exhibit [*]. SUPPLIER will respond via E-mail with confirmation
              of receipt, and [*], if within SUPPLIER's [*]via the [*]within
              [*]normal business [*]of receipt of EMC's [*]. SUPPLIER will [*]a
              [*] the applicable [*]for [*]the applicable SUPPLIER [*]

        (d) SUPPLIER shall [*]to be placed in a SUPPLIER [*], via [*]point of
            [*]where [*]" is defined in section [*]., including [*], provided
            that EMC has [*]the [*]and [*]in advance. Notwithstanding the
            foregoing, in the event of [*], SUPPLIER may choose the [*]at its
            [*].

        (e) EMC shall provide the [*]for the SUPPLIER [*]. All Products in the
            SUPPLIER [*]shall be and [*]the [*]of [*],[*]as they are [*]EMC, as
            defined below. EMC will [*]each SUPPLIER [*]in EMC's facilities in a
            manner such that the SUPPLIER [*]shall be segregated by a clear and
            durable physical delineation, separating the SUPPLIER [*]from the
            other parts of the EMC location and from EMC's other products,
            supplies, inventory, and equipment, and EMC shall conspicuously mark
            the area of each SUPPLIER [*] to indicate [*]the [*]EMC shall have
            [*]of [*]or [*]the SUPPLIER [*]EMC will exercise the same degree of
            care to keep and maintain the [*] as [*] uses with respect to [*].
            EMC will implement and maintain [*]to prevent any loss, theft,
            damage, or destruction of the [*]

        (f) Products contained in a SUPPLIER [*]shall be deemed to be [*]EMC for
            purposes of this Amendment when the Products are [*]. Upon [*], EMC
            shall be deemed to be in [*]of the Products for purposes of Section
            [*]of the Agreement, and the [*]shall equal the [*]the [*]was
            communicated to [*] for purposes of Section [*]of the Agreement. [*]
            shall [*]for such [*] as detailed in EMC's [*]in accordance with
            Section [*]of the Agreement. At such time, [*] shall also [*]for the
            [*]of [*]and [*]such Products, at agreed upon [*], from the
            SUPPLIER's [*]the SUPPLIER [*]Site. Once a [*] has been [*], no
            [*]such [*] may be [*]into any SUPPLIER [*], and the [*]may only be
            [*]by

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            EMC in accordance with the terms set forth in Section [*]or Section
            [*]of the Agreement.

        (g) At all times the SUPPLIER [*]will be kept [*]by [*]from all [*], and
            [*]of any kind.

        (h) EMC will allow access to a SUPPLIER representative to perform a
            count of [*]held in each SUPPLIER [*]once per [*]at a time scheduled
            no less than [*] hours in advance to [*]weekly activity and numbers
            of [*]on hand. SUPPLIER may, at its option, conduct an on-site audit
            to [*]the count of [*]and physically inspect the [*].

        (i) During the term of this Agreement and for as long as any SUPPLIER
            [*]are [*]facilities, EMC shall maintain policies of insurance for
            the Products to cover the [*]and shall provide site access and
            inspection rights to SUPPLIER. SUPPLIER shall provide EMC no less
            than [*]hour notification prior to a requested audit and inspection.

3.       Additional Exhibits N, O, P and Q are added to the Agreement in the
form attached to this Amendment as Attachment 1.

B.       SECTION 15 (PRODUCT WITHDRAWALS). Section 15 is replaced in its
entirety with the following:

         15.0 A. Product Withdrawals.

         15.1 A SUPPLIER will notify EMC in writing at least [*]days prior to
         Product withdrawal. During the withdrawal notice period, EMC may
         [*]with normal [*]up until the [*]. Last-time-buy purchase orders must
         be non-cancelable of any Product requested to be delivered in the
         [*]days of the [*]. Product withdrawal shall not affect SUPPLIER's
         obligation to fill purchase orders previously issued hereunder.

         15.2 A. SUPPLIER shall provide Product [*]for the [*]to EMC at a
         reasonable [*] and [*]until the end of [*]years after Product [*],
         pursuant to terms and conditions set forth in Exhibit [*], Product [*].
         The foregoing notwithstanding, EMC shall have [*]to order any Product
         [*]from SUPPLIER.

         15.0 B. [*].

         15.1 B. [*]Release Definitions.

                  [ PRODUCT_VERSION_CODE platform . feature . maintenance
                  [patch] ]
                  e.g., V4.1.0 | V4.1.3A | FM4.2.0 | API3.0.1

                  PRODUCT_VERSION_CODE (STRING DESIGNATOR) - the letter V is
                  exclusively used by the [*]software product. For all other
                  products, the product code name will be used. To avoid
                  potential issues, all products will be named with lowercase.

                  "PLATFORM" - Platform Release Version is always a number. It
                  is used to designate a [*]to the software, and generally
                  follows core fabric OS [*], hardware [*]or new [*]support.

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                  "FEATURE" - Feature Release Version is always a number. It is
                  used to indicate added minor and/or major [*]within a Platform
                  Release Version.

                  "MAINTENANCE" - Maintenance Release Version is always a
                  number. It is used to indicate a scheduled (date driven)
                  release of defect fixes and carefully selected [*] (Requests
                  for [*].)

                  "PATCH" - Patch Release Version is a letter (a-z). A Patch
                  release Version should be considered functionally identical to
                  Maintenance Release Version with the exception of the
                  identified defect fixes. It will consist of one, or a limited
                  number of defect fixes. A patch release is based upon the
                  severity/priority of the defect and must be a [*]defect from a
                  [*]point of view as well as from [*]point of view.
                   -  Patch fixes are rolled into the next maintenance, feature
                      or platform release.

                   -  Patch fixes are cumulative for that code branch.

         15.2. B SUPPLIER Notification and Support.

         SUPPLIER shall provide a [*]month advance written notification for the
         [*]of [*]releases. Such notification will include all [*]and
         [*]Releases within that [*]Release. SUPPLIER will continue to support
         critical issues (identified as critical by mutual agreement between EMC
         and Brocade) for a period of [*] months after the [*]. In determining
         whether an issue is critical, the parties will consider the following
         definition: Severity Level 1 represents an event of data corruption or
         reproducible emergency condition that makes the use or continued use of
         any one or more functions impossible at a Customer. The parties further
         agree that the [*]for the [*]Feature Release is [*]months after such
         time, an [*]may be issued by SUPPLIER.

C.       Except as expressly amended herein, the terms of the Agreement
continues unchanged, shall remain in full force and effect, and shall govern all
transactions for Products hereunder.

IN WITNESS WHEREOF, the Parties have caused this Amendment be executed by their
duly authorized representatives, as of the Effective Date.

BROCADE COMMUNICATION SYSTEMS, INC.                         EMC CORPORATION

By: /s/ Jack Cuthbert                       By: /s/ William Monagle
   --------------------------------             --------------------------------
    (Signature)                                           (Signature)
Name: Jack Cuthbert                         Name: William Monagle
      -----------------------------               ------------------------------
      (Please Print or Type)                      (Please Print or Type)
Title: Vice President, OEM Sales            Title: Vice President Corporate
                                                   Procurement, EMC
                                                   Corporation
Date: May 4, 2004                           Date: May 13, 2004

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BROCADE COMMUNICATION SWITZERLAND, SARL.

By: /s/ Ian Whiting
   --------------------------------
   (Signature)

Name: Ian Whiting
      -----------------------------
      (Please Print or Type)
Title: VP EMEA & LATAM

Date: 07-May-2004

                                  Page 6 of 10

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                                  ATTACHMENT 1
                                 TO AMENDMENT 5
                               PURCHASE AGREEMENT

                                    EXHIBIT N
                            LOCATION OF SUPPLIER [*]

SUPPLIER [*]Address:

                                   EMC Corporation
                                   One Technology Drive
                                   Apex, NC 27502

                                   EMC Corporation
                                   176 Grove Street
                                   Franklin, MA 02038

  SUPPLIER [*]:                    [*]warehouse - pole #,
   location:                       which is an area designated as
                                   [*]inventory.

                                   Franklin Grove St. facility, first floor, - a
                                   caged location in the incoming area, which is
                                   an area designated as [*]inventory.

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                                    EXHIBIT O

                                [*]REPORT EXAMPLE

[*]

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                                    EXHIBIT P

                               EMC UNIQUE MATERIAL

The complete list of EMC unique material that EMC [*]pursuant to Paragraph [*]of
this Amendment is as follows:

EMC Unique Material

2/20/2004

<TABLE>
<CAPTION>
Part Number              Part Description
-----------              ----------------
<S>                      <C>
[*]                      [*]
[*]                      [*]
[*]                      [*]
[*]                      [*]
[*]                      [*]
[*]                      [*]
[*]                      [*]
[*]                      [*]
[*]                      [*]
[*]                      [*]
[*]                      [*]
</TABLE>

[*]
[*]

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                                    EXHIBIT Q

                             RELEASE NOTICE EXAMPLE

[*]

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**CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY WITH
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                                                                   EXHIBIT 10.74

                                                            [IBM LOGO]
                                                            3039 Cornwallis Road
                                                            RTP, NC 27709

May 14, 2004

Brocade Communications Systems, Inc.
1745 Technology Drive
San Jose, CA 95110

Attention: Mr. Michael Harrison

Subject: Amendment 16 to SOW#1 of the IBM/Brocade Goods Agreement ROC-P-68

Dear Michael:

This letter (the "Amendment") serves as Amendment Number 16 to SOW#1, including
all amendments thereto ("SOW#1") of the Goods Agreement ROC-P-68, which the
parties hereto do mutually agree to amend as follows:

1. Delete pricing table in Section 2.1, "Pricing," in its entirety and replace
with the following:

<TABLE>
<CAPTION>
IBM P/N / NUMA-Q
      P/N          BROCADE P/N         DESCRIPTION          UNIT PRICE
----------------   -----------   ------------------------   ----------
<S>                <C>           <C>                        <C>
[*]                [*]           8-Port Fibre Channel              [*]
                                 Switch Single Power
                                 Supply (SW2400) [*]-
                                 whole unit switch
                                 Product

[*]                [*]           16 Port Fibre Channel             [*]
                                 Switch Single Power
                                 Supply (SW2800) Includes
                                 [*]- whole unit switch
                                 Product

[*]                [*]           Silkworm 2000 Power               [*]
                                 Supply

[*]                [*]           Mainboard, SW 2400                [*]
                                 (8-port)

[*]                [*]           Fan Tray, SW 2400                 [*]
                                 (8-port)

[*]                [*]           Chassis, SW 2400                  [*]
                                 (8-port)

[*]                [*]           Mainboard, SW 2800                [*]
                                 (16-port)

[*]                [*]           Fan Tray, SW 2800                 [*]
                                 (16-port)

[*]                [*]           Chassis, SW 2800                  [*]
                                 (16-port) with operator
                                 panel / LCD

[*]                [*]           Quick Loop License                [*]

[*]                [*]           Fabric Watch License              [*]

[*]                [*]           Extended Fabrics                  [*]

[*]                [*]           Extended Fabrics                  [*]
</TABLE>

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**CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY WITH
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                                        1

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<TABLE>
<S>                <C>           <C>                        <C>
[*]                [*]           Remote Switch                     [*]

[*]                [*]           Remote Switch                     [*]

[*]                [*]           8 Port Fibre Channel              [*]
                                 Switch Single Power
                                 Supply (SW3200) [*] (to
                                 be included prior to
                                 10/28/03 for
                                 availability for Buyer
                                 customer shipments)

[*]                [*]           8 Port Fibre Channel              [*]
                                 Switch Single Power
                                 Supply (SW3200) [*]               [*]

[*]                [*]           Full Fabric Upgrade               [*]
                                 Includes [*]

[*]                [*]           16 Port Fibre Channel             [*]
                                 Switch Single Power
                                 Supply (SW3800) Includes
                                 [*]- whole unit switch
                                 Product

[*]                [*]           Fan (SW3800)                      [*]

[*]                [*]           Power Supply (SW3800)             [*]

[*]                [*]           Mainboard FRU (SW3800)            [*]

[*]                [*]           32 Port Fibre Channel             [*]
                                 Switch Double Power
                                 Supply (SW3900)
                                 Includes[*]- whole unit
                                 switch Product

[*]                [*]           Fan (SW3900)                      [*]

[*]                [*]           Power Supply (SW3900)             [*]

[*]                [*]           Mainboard FRU (SW3900)            [*]

[*]                [*]           Secure Fabric OS                  [*]
                                 (SW3200)

[*]                [*]           Secure Fabric OS                  [*]
                                 (SW3800)

[*]                [*]           1Gb Secure Fabric OS              [*]

[*]                [*]           Secure Fabric OS                  [*]
                                 (SW3900)

[*]                [*]           Secure Fabric OS                  [*]
                                 (SW12000)                         [*]

[*]                [*]           Performance Bundle                [*]
                                 ([*])

[*]                [*]           Performance Bundle                [*]
                                 ([*])

[*]                [*]           32 Port Fibre Channel             [*]
                                 Core Switch (SW12000)
                                 [*]                               [*]

[*]                [*]           Rack Mounting Kit                 [*]
</TABLE>

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                                       2

<PAGE>

<TABLE>
<S>                <C>           <C>                        <C>
                                 14U, FRU

[*]                [*]           Switch Blade 16 port,             [*]
                                 2GB

[*]                [*]           Switch Blade 16 port,             [*]
                                 2Gb, FRU

[*]                [*]           Chassis Door, Includes            [*]
                                 [*]

[*]                [*]           Control Processor Blade           [*]

[*]                [*]           Stiletto Port Blade Slot          [*]
                                 Filler Panel, SW12000,
                                 FRU

[*]                [*]           Power Supply ,                    [*]
                                 180-264VAC, 1000W, FRU

[*]                [*]           Blower Assembly, FRU              [*]

[*]                [*]           Cable Management Pillar,          [*]
                                 FRU

[*]                [*]           WWN Card                          [*]

[*]                [*]           Power Plug, Switch and            [*]
                                 Distribution Panel

[*]                [*]           Chassis FRU,                      [*]
                                 includes [*].

[*]                [*]           Rear WWN Bezel Assy               [*]

[*]                [*]           Cable Management Tray             [*]

[*]                [*]           AC Power Cord, FRU                [*]

[*]                [*]           AC Power Cord,                    [*]
                                 UK/Ireland, 250V, FRU

[*]                [*]           AC Power Cord, Cont.              [*]
                                 Europe CEE7/7, FRU

[*]                [*]           AC Power Cord, AUST/INZ,          [*]
                                 250V

[*]                [*]           AC Power Cord, Intl IEC           [*]

[*]                [*]           Remote Switch software            [*]

[*]                [*]           Extended Fabric software          [*]

[*]                [*]           Fabric Manager 3.x                [*]

[*]                [*]           ISL Trunking (SW3200)             [*]

[*]                [*]           ISL Trunking (SW3800)             [*]
</TABLE>

<TABLE>
<CAPTION>
                                                                                   **[*]SOFTWARE
BUYER                                                                               MAINTENANCE
PART     SUPPLIER PART                                                             ([*]UNIT PRICE
NUMBER      NUMBER       PRODUCT DESCRIPTION               UNIT PRICE OF PRODUCT    OF PRODUCT)
------   -------------   -------------------               ---------------------   --------------
<S>      <C>             <C>                               <C>                     <C>
[*]      [*]             Fabric Manager 4.x-Enterprise                       [*]   [*]
                         ([*])

[*]      [*]             Fabric Manager 4.x - 3.0 to 4.x                     [*]   [*]
</TABLE>

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                            3
<PAGE>

<TABLE>
<S>      <C>             <C>                               <C>                     <C>
                         Upgrade to Enterprise ([*])

[*]      [*]             Fabric Manager 4.x with 10                          [*]   [*]
                         Domains

[*]      [*]             Fabric Manager 4.x [*]                              [*]   [*]

[*]      [*]             Secure Fabric OS                                    [*]   [*]
                         (SW12000/24000) [*]

[*]      [*]             32 Port Fibre Channel Director                      [*]   [*]
                         (SW24000) Includes [*]

[*]      [*]             Meteor, 16 Port [*]                                 [*]   [*]

[*]      [*]             Meteor Upgrade kit. Includes[*]                     [*]   [*]

[*]      [*]             8 Port Fibre Channel Two Domain                     [*]   [*]
                         Switch Single Power Supply
                         (SW3250), Includes [*]

[*]      [*]             8 Port Fibre Channel Two Domain                     [*]   [*]
                         Switch Single Power Supply                          [*]
                         (SW3250), Includes [*]

[*]      [*]             16 Port Fibre Channel Four                          [*]   [*]
                         Domain Switch, Two Fixed Power
                         Supplies (SW3850), Includes [*]

[*]      [*]             16 Port Fibre Channel Four                          [*]   [*]
                         Domain Switch, Two Fixed Power
                         Supplies (SW3850), Includes [*]                     [*]   [*]

[*]      [*]             Secure Fabric OS (SW3850)                           [*]   [*]

[*]      [*]             Secure Fabric OS (SW3250)                           [*]   [*]

[*]      [*]             Meteor FRU Chassis , includes                       [*]   [*]
                         [*],

[*]      [*]             Meteor FRU, Chassis Door.                           [*]   [*]
                         Includes [*]

[*]      [*]             Meteor Switch Blade 16 port,                        [*]   [*]
                         2Gb, FRU

[*]      [*]             Meteor Control Processor Blade,                     [*]   [*]
                         FRU

[*]      [*]             FRU, Power Supply Filler Panels                     [*]   [*]

[*]      [*]             Extended Fabric                                     [*]   [*]

[*]      [*]             Remote Switch                                       [*]   [*]

[*]      [*]             Performance Bundle ([*])                            [*]   [*]

[*]      [*]             Four Domain to Full Fabric                          [*]   [*]
                         Upgrade

[*]      [*]             Extended Fabric                                     [*]   [*]

[*]      [*]             Remote Switch                                       [*]   [*]

[*]      [*]             Performance Bundle ([*])                            [*]   [*]

[*]      [*]             Two Domain to Full Fabric                           [*]   [*]
                         Upgrade [*]

[*]      [*]             8 port Switch FRU [*]                               [*]   [*]

[*]      [*]             16 port Switch FRU [*]                              [*]   [*]
</TABLE>

**For purpose of calculating the fees for the [*]as described in Section [*],
the [*] per Unit for each part number where it is applicable as follows:

"-------------------
**CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY WITH
THE SECURITIES AND EXCHANGE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS."

                                        4

<PAGE>

<TABLE>
<CAPTION>
IBM
PART     BROCADE PRODUCT
NUMBER    PART NUMBER                          PRODUCT DESCRIPTION                        [*] PER UNIT
------   ---------------   ------------------------------------------------------------   ------------
<S>      <C>               <C>                                                            <C>
[*]      [*]               32 Port Fibre Channel Director (SW24000) [*]                            [*]

[*]      [*]               Meteor Upgrade kit. Includes[*]                                         [*]

[*]      [*]               8 Port Fibre Channel Two Domain Switch Single Power Supply              [*]
                           (SW3250),
                           Includes [*]

[*]      [*]               8 Port Fibre Channel Two Domain Switch Single Power Supply              [*]
                           (SW3250),
                           Includes [*]

[*]      [*]               16 Port Fibre Channel Four Domain Switch, Two Fixed Power               [*]
                           Supplies (SW3850),
                           Includes [*]

[*]      [*]               16 Port Fibre Channel Four Domain Switch, Two Fixed Power               [*]
                           Supplies (SW3850),
                           Includes [*]

[*]      [*]               Fabric Manager 4.x-Enterprise ([*])                                     [*]

[*]      [*]               Fabric Manager 4.x  - 3.0 to 4.x Upgrade to Enterprise ([*])            [*]

[*]      [*]               Fabric Manager 4.x with 10 Domains                                      [*]

[*]      [*]               Fabric Manager 4.x [*]                                                  [*]

[*]      [*]               Secure Fabric OS (SW3850)                                               [*]

[*]      [*]               Secure Fabric OS (SW3250)                                               [*]

[*]      [*]               Secure Fabric OS (SW12000/24000)                                        [*]
</TABLE>

OUT OF WARRANTY REPAIR PRICING:

[*]
[*]

ACCEPTED AND AGREED TO:
INTERNATIONAL BUSINESS MACHINES           ACCEPTED AND AGREED TO:
CORPORATION                               BROCADE COMMUNICATIONS SYSTEMS, INC.

By: /s/ Robert J. Tice    5/26/04         By: /s/ Michael Klayko       5/24/04
    ---------------------------------          ---------------------------------
    Authorized Signature     Date              Authorized Signature    Date

"-------------------
**CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED SEPARATELY WITH
THE SECURITIES AND EXCHANGE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN
REQUESTED WITH RESPECT TO THE OMITTED PORTIONS."

                                        5

<PAGE>

         Robert J. Tice                             Michael Klayko
-------------------------------------      -------------------------------------
         Type or Print Name                         Type or Print Name

         OEM Procurement Team Lead                  VP, WW Sales
-------------------------------------      -------------------------------------
         Title & Organization                       Title & Organization

                                        6

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