Document:

<PAGE>

                            FIFTH AMENDMENT TO LEASE

         This Fifth Amendment to Lease (the "FIFTH AMENDMENT"), dated as of
October 27, 2006 is made by and between Bel Marlborough I LLC, a Delaware
limited liability company ("LANDLORD"), and 3Com Corporation, a Delaware
corporation ("TENANT").

                                   BACKGROUND

         WHEREAS, Marlborough Campus Limited Partnership ("MCLP") and Tenant
entered into a lease (the "ORIGINAL LEASE") dated as of November 26, 2002, as
amended by a First Amendment to Lease dated as of November 26, 2002, Second
Amendment to Lease dated as of February 16, 2005, Third Amendment to Lease dated
as of July 18, 2005, and Fourth Amendment to Lease dated as of December 12, 2005
(the Original Lease, as amended, the "LEASE") pursuant to which Landlord leased
to Tenant certain premises containing approximately 168,315 rentable square feet
(the "ORIGINAL PREMISES") located in the building at 350 Campus Drive ("BUILDING
2"), and approximately 2,478 rentable square feet of space (the "EXPANSION
PREMISES") located on the second floor of the building located at 100 Campus
Drive ("BUILDING 1"), and approximately 30,203 rentable square feet of space
(the "ADDITIONAL PREMISES") located on the fifth floor of Building 1 (the
Original Premises, the Expansion Premises and the Additional Premises,
collectively, the "PREMISES"), in The Campus at Marlborough (the "PROJECT"), in
Marlborough, Massachusetts;

         WHEREAS, MCLP has assigned its interest in the Lease to Landlord; and

         WHEREAS, Landlord and Tenant wish to amend the Lease as more
particularly set forth herein.

                                    AGREEMENT

         NOW THEREFORE, in consideration of the mutual covenants and conditions
of the parties set forth in the Lease and this Fifth Amendment, and for other
good and valuable consideration, the parties, intending to be legally bound,
agree that the Lease is hereby amended as follows:

         1.       Defined Terms. Capitalized terms used in this Fifth Amendment
and not otherwise defined herein shall have the meanings set forth in the Lease.

         2.       Modification of the Premises. (a) Tenant agrees to vacate the
Additional Premises on or before December 31, 2006, and to surrender the
Additional Premises to Landlord in accordance with the terms and conditions of
the Lease, as if such date were the expiration date of the Lease with respect to
the Additional Premises. Subject to the terms and conditions of this Amendment,
the Term of the Lease shall terminate with respect to the Additional Premises on

<PAGE>

the date that Tenant vacates the Additional Premises and surrenders it to
Landlord as set forth above (such date, the "GIVE BACK DATE").

         (b)      Nothing herein shall be deemed to constitute Landlord's
consent or acquiescence to Tenant's remaining in the Additional Premises after
December 31, 2006. If Tenant fails to vacate the Additional Premises on or
before December 31, 2006, other than due to Landlord's failure to enter into a
lease with Wellington Management Company LLP for the Additional Premises, Tenant
shall be a tenant at sufferance with respect to the Additional Premises and the
Rent Continuance Date shall be extended by one day for every day that elapses
from December 31, 2006 to and including the Give Back Date. In addition, if
Tenant has not vacated the Additional Premises by December 31, 2006, commencing
on January 1, 2007 Tenant shall pay Additional Rent on the Additional Premises
at a rate of $2,100.00 per day (the "Holdover Premium Rent"), in addition to the
Base Rent set forth in Section 5 below and all other Additional Rent due
pursuant to the terms of the Lease; provided however, if Tenant has given
Landlord written notice on or before December 20, 2006 that it will not be able
to vacate the Additional Premises by December 31, 2006, but agrees to vacate by
a date certain specified in such notice, the Holdover Premium Rent shall not
commence until January 15, 2007.

         (c)      Tenant acknowledges that Landlord has entered into, or intends
to enter into a lease amendment (the "Wellington Amendment") with Wellington
Management Company, LLP ("Wellington") for the Additional Premises, and that the
Wellington Amendment is a material inducement to Landlord's entering into this
Fifth Amendment, and that Landlord could suffer significant damages if Tenant
defaults under the terms of this Fifth Amendment. If the Give Back Date has not
occurred on or before January 14, 2007, Tenant shall also be liable for, and
shall reimburse Landlord upon demand for all costs, expenses, and damages
incurred by Landlord, including without limitation, reasonable attorneys' fees
and brokerage fees and commissions paid or incurred in connection with the
Wellington Amendment, any and all damages due to Wellington for failure to
deliver the Additional Premises to Wellington on January 1, 2007 pursuant to the
Wellington Amendment, and if Wellington terminates its lease agreement with
Landlord for the Additional Premises because of Tenant's failure to vacate the
Additional Premises on or before December 31, 2006, in addition to any other
remedies available to Landlord under this Fifth Amendment and/or at law or in
equity, Landlord may terminate this Fifth Amendment.

         (d)      From and after the Give Back Date, all references in the Lease
to the Premises shall be deemed to exclude the Additional Premises. From and
after the Give Back Date, the Premises shall consist of the remaining portion of
the Original Premises and the Expansion Premises consisting of a total of
approximately 170,793 rentable square feet, and Section 2.2 of the Summary is
amended accordingly.

         3.       Rent. In consideration of Landlord's agreement to modify the
Premises, Tenant agrees that it shall pay Rent on the Additional Premises
through the date (the "Rent Continuance Date") that is seventy days after the
later of: December 31, 2006 or the Give Back Date (which is agreed to be March
11, 2007 if the Give Back Date occurs on or before December 31, 2006). Provided
that Tenant has vacated the Additional Premises in accordance with the terms of
this

                                       2

<PAGE>

Fifth Amendment on or before December 31, 2006, Section 4 of the Summary of
Basic Lease Information in the Lease is amended to read as follows:

         "4.      Base Rent:

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------
                                                                       Monthly
                                                Annual Base        Installment of
          Period                    RSF             Rent              Base Rent        Per RSF
          ------                    ---         -----------        --------------      -------
-----------------------------------------------------------------------------------------------
<S>                               <C>           <C>                <C>                 <C>
-----------------------------------------------------------------------------------------------
     1/1/07 - 2/28/07             200,996       4,522,410.00         376,867.50         $22.50
-----------------------------------------------------------------------------------------------

-----------------------------------------------------------------------------------------------
     3/1/07 - 3/11/07*            200,996       4,522,410.00         133,727.18         $22.50
-----------------------------------------------------------------------------------------------
    3/12/07 - 3/31/07*            170,793       3,842,842.50         206,604.44         $22.50
-----------------------------------------------------------------------------------------------
     3/1/07 - 3/31/07*                                               340,331.62
-----------------------------------------------------------------------------------------------

-----------------------------------------------------------------------------------------------
     4/1/07 - 11/30/09            170,793       3,842,842.50         320,236.88         $22.50
-----------------------------------------------------------------------------------------------

-----------------------------------------------------------------------------------------------
    12/1/09 - 7/31/10               2,478          61,950.00           5,162.50         $25.00
-----------------------------------------------------------------------------------------------
</TABLE>

*To be adjusted if the Give Back Date occurs after December 31, 2006.

  Base Rent for Original Premises during Option Term, if exercised:

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------
                                                                       Monthly
                                                   Annual            Installment
          Period                    RSF          Base Rent          of Base Rent       Per RSF
          ------                    ---          ---------          ------------       -------
-----------------------------------------------------------------------------------------------
<S>                               <C>           <C>                <C>                 <C>
Option Term (Original
Premises only):
12/1/09 -- 11/30/12               168,315       $4,207,875.00       $350,656.25        $25.00
-----------------------------------------------------------------------------------------------
</TABLE>

         4.       Tenant's Pro Rata Share. Provided that Tenant has vacated the
Additional Premises in accordance with the terms of this Fifth Amendment on or
before December 31, 2006:

         (a)      Effective as of March 22, 2007, Tenant's Share shall be 32.11%
and Tenant's Building Share with respect to Building 1 shall be 1.68%.

         (b)      Effective December 1, 2009, if Tenant does not exercise its
Option to Extend with respect to the Original Premises, Tenant's Share shall be
..47% and Tenant's Building Share with respect to Building 1 shall be 1.68%.

                                       3
<PAGE>

         (c)      Effective August 1, 2010, if Tenant has exercised its Option
to Extend with respect to the Original Premises, Tenant's Share shall be 31.64%.

         5.       Tenant's Chiller Share. Provided that Tenant has vacated the
Additional Premises in accordance with the terms of this Fifth Amendment on or
before December 31, 2006, effective March 22, 2007, Tenant's Chiller Share under
the Lease shall be: 8.64% (based on 19/220 tons) for the Expansion Premises.

         6.       Parking. Effective January 1, 2007, Section 9 of the Summary
is amended to read as follows "Tenant shall have non-exclusive use of 550
unreserved parking spaces, as more particularly set forth in Article 28."

         7.       Ratification of Lease. Except as modified by this Fifth
Amendment, the Lease is hereby ratified and affirmed, and is in full force and
effect and unmodified in all other respects. In the event of any inconsistency
between the terms and conditions of this Fifth Amendment and the terms and
conditions of the Lease, the terms and conditions of this Fifth Amendment shall
govern.

         8.       No Other Amendment. There are no other oral or written
understandings, agreements or obligations between Landlord and Tenant other than
those expressly set forth in the Lease and this Fifth Amendment. In the event of
any inconsistency between the terms of this Fifth Amendment and the terms of the
Lease, the terms of this Fifth Amendment shall control.

         9.       No Presumption Against Drafter. Landlord and Tenant
understand, agree and acknowledge that this Fifth Amendment has been freely
negotiated by both parties; and that, in any controversy, dispute, or contest
over the meaning, interpretation, validity or enforceability of this Fifth
Amendment or any of its terms or conditions, there shall be no inference,
presumption, or conclusion drawn whatsoever against either party by virtue of
that party having drafted this Fifth Amendment or any portion thereof.

         10.      Enforceability. If any provision of this Fifth Amendment shall
be invalid or unenforceable to any extent, the remainder of this Fifth Amendment
shall not be affected thereby and shall be enforced to the greatest extent
permitted by law.

         11.      Broker. Landlord and Tenant hereby represent and warrant to
each other that they have had no dealings with any real estate broker or agent
in connection with the negotiation of this Fifth Amendment, excepting Cushman &
Wakefield of Massachusetts, Inc. and LPC Commercial Services, Inc. ("BROKER"),
and that they know of no other real estate broker or agent who is entitled to a
commission, fee or other compensation in connection with this Fifth Amendment.
Tenant represents and warrant that it shall pay and shall be solely liable for
any fee, commission or other compensation payable to Cushman & Wakefield of
Massachusetts Inc. in connection with the transactions contemplated by this
Fifth Amendment, and Landlord represents and warrants that it shall pay and
shall be solely liable for any fee, commission or other compensation payable to
LPC Commercial Services, Inc. in connection with the transactions contemplated
by this Amendment. Each party agrees to indemnify and defend the other party
against and hold the other party harmless from any and all claims, demands,
losses, liabilities, lawsuits, judgments, costs and expenses (including without
limitation reasonable

                                       4
<PAGE>

attorneys' fees) arising from a breach of its representations set forth in this
Section 11 and/or with respect to any leasing commission or other compensation
alleged to be owing on account of any dealings with any real estate broker or
agent, other than Brokers, occurring by, through, or under the indemnifying
party.

         12.      Counterparts. This Fifth Amendment may be executed in multiple
counterparts, each of which shall constitute an original.

         13.      Authority. Each individual executing this Fifth Amendment
hereby represents and warrants that Landlord, Landlord's general partner, or
Tenant, as applicable, is a duly formed and existing entity in good standing
qualified to do business in the Commonwealth of Massachusetts and has full right
and authority to execute and deliver this Fifth Amendment and perform its
obligations under the Lease (as amended by this Fifth Amendment) and that each
person or entity acting and/or signing on behalf of Landlord, Landlord's general
partner, or Tenant, as applicable, is authorized to do so. Each of the parties
hereto represents and warrants to the other that no consent from any other
person or entity is necessary as a condition precedent to the legal effect of
this Fifth Amendment, except that the approval of Landlord's mortgagee may be
required, and if so, will be obtained by Landlord prior to Landlord's execution
of this Fifth Amendment.

         14.      Contingency. This Fifth Amendment is contingent upon
Landlord's obtaining the written consent of its lender and Landlord's entering
into a lease amendment with Wellington with respect to the Additional Premises
in form and substance satisfactory to Landlord, in its sole discretion, on or
before October 31, 2006. In the event that said contingencies have not been
satisfied within said time period, Landlord may terminate this Fifth Amendment
upon written notice given to Tenant on or before November 15, 2006, in which
case this Fifth Amendment shall be and become null and void and of no further
force or effect.

                            [Signatures on next page]

                                       5
<PAGE>

         IN WITNESS WHEREOF, Landlord and Tenant have caused this Lease to be
executed the day and date first above written.

                                          "LANDLORD":

                                          By: /s/ DAVID CULLEN
                                          Its: VICE PRESIDENT

                                          "TENANT":

                                          3COM CORPORATION,
                                          a Delaware corporation
Attest:
                                          By: /s/ NEAL D. GOLDMAN
By: /s/ DANA J. ST. JAMES                     Name: Neal D. Goldman
    Name: Dana J. St. James                   Title: Senior VP, GC and Secretary
    Title: Legal Director                 (Corporate Seal)

                                       6
<PAGE>

                        (ACKNOWLEDGMENT FOR CORPORATION)

STATE OF __________________
                                 SS.:
COUNTY OF _________________

                  On this __ day of _________, 2006, before me the undersigned
notary public, personally appeared ___________________, and provided to me
through satisfactory evidence of identification, which was _________________, to
be the person whose name is signed on the preceding or attached document and
acknowledged to me that he/she signed it voluntarily for its stated purpose, as
____________________ of 3Com Corporation.

                                           /s/ DANA J. ST. JAMES
                                           Notary Public

                                           My commission expires:

                                       7<PAGE>

                                3COM CORPORATION
                        SECTION 16 OFFICER SEVERANCE PLAN
                   PLAN DOCUMENT AND SUMMARY PLAN DESCRIPTION

                Amended and Restated Effective September 11, 2006

This Plan Document and Summary Plan Description ("Summary Plan Description") is
for all employees of 3Com Corporation ("3Com" or the "Company") who are eligible
under the terms of the 3Com Section 16 Officer Severance Plan (the "Section 16
Plan"). All rights to participate in and receive benefits from the Section 16
Plan are governed solely by the terms and conditions of this Summary Plan
Description. This Summary Plan Description supercedes and replaces all prior
plan documents and summary plan descriptions governing the Section 16 Plan.

I.       EFFECTIVE DATE
The Section 16 Plan is hereby amended and restated effective September 11, 2006.

II.      ELIGIBILITY TO PARTICIPATE
Participation in the Section 16 Plan is restricted to active 3Com employees who
have been designated by the Company, at its discretion and consistent with
applicable law, as being subject to the reporting requirements of Section 16 of
the Securities Exchange Act of 1934, as amended ("Officers").

III.     ELIGIBILITY TO RECEIVE BENEFITS
Officers who are employed by the Company are eligible to receive benefits upon
the termination of their employment with 3Com under following circumstances: (a)
an involuntary termination without Cause; or (b) a Voluntary Termination for
Good Reason. The receipt of benefits under the Section 16 Plan will be
conditioned upon the Officer's execution of and compliance with an agreement
(the "Release Agreement") including, but not limited to, (i) a release of claims
against the Company, its affiliates and representatives; (ii) a non-solicitation
provision prohibiting the Officer's solicitation of any Company employee,
business opportunity, client, customer, account, distributor or vendor for a
period of one (1) year following the Termination Date; and (iii) a
non-competition provision prohibiting the Officer from directly or indirectly
engaging in, participating in or having a material ownership interest in a
business in competition with the Company. The form and language of the Release
Agreement shall be determined by the Company in its sole discretion.

IV.      BENEFITS
Officers who are eligible to receive benefits under the Section 16 Plan will be
entitled to receive the following upon their execution of the Release Agreement:

         A.       Severance Amounts.

                  1.       One (1) year of the Officer's annualized base salary
as of the Termination Date, subject to all applicable taxes and withholdings;
and

                  2.       A pro-rated amount of the Officer's earned incentive
bonus for the bonus period in which the Termination Date occurs, to be
calculated by multiplying the earned bonus amount (based on the Company's actual
attainment of applicable performance metrics) by a fraction, the numerator of
which shall be the number of calendar days between the beginning of the
applicable bonus period to the Termination Date and the denominator of which
shall be the number of calendar days within the applicable bonus period, payable
through the Company's regular bonus payment practices and subject to all
applicable taxes and withholdings.

                                       1

3Com Corporation Section 16 Officer Severance Plan  Amended and Restated 9/11/06
<PAGE>

         B.       Health, Dental & Vision Benefits. Continuation of coverage
under the Company's health, dental, and vision insurance plans ("Health Care
Plans") pursuant to the Consolidated Omnibus Budget Reconciliation Act of 1985
("COBRA") at the same level of coverage as was provided to and elected by the
Officer as of the Termination Date. If the Officer timely and properly elects to
continue coverage under the Company's Health Care Plans in accordance with
COBRA, the Company shall continue to pay the Company-paid portion of the
premiums for the Officer's elected coverage under the Health Care Plans until
the earlier of: (i) one (1) year from the Termination Date, or (ii) the date
upon which the Officer becomes eligible for coverage under another employer's
group health, dental, or vision insurance plan(s). The Officer will remain
obligated to pay the unsubsidized portion of the applicable premium(s) in order
to continue Company-sponsored coverage. The Company-paid portion of any
premium(s) is subject to change at the Company's discretion. To be eligible for
continuation of coverage under the Health Care Plans, an Officer must be
actively enrolled in the applicable Health Care Plan(s) as of the Termination
Date. For purposes of Title X of COBRA, the date of the "qualifying event" for
the Officer and his/her covered dependents shall be the Termination Date, and
each month of Company-sponsored coverage continuation provided hereunder shall
offset a month of coverage continuation otherwise due under COBRA. Upon the
expiration of the one (1) year period, the Officer will be required to pay 102%
of the premium to continue Company-sponsored coverage. Any continuation of
Company-sponsored coverage shall be governed by COBRA and the terms and
conditions of the applicable plan documents.

         C.       Life Insurance.  Conversion of the Officer's basic term life
insurance in effect immediately prior to the Termination Date to continue
coverage until the earlier of (i) one (1) year from the Termination Date, or
(ii) the date upon which the Officer becomes eligible for coverage under another
employer's life insurance plan.

         D.       Equity Compensation.

                  1.       Six (6) months of accelerated vesting of outstanding
stock options, restricted stock, and restricted stock units issued to the
Executive that are subject to time-based vesting. The accelerated vesting
provided for herein will be effective as of the Termination Date.

                  2.       Extension of the exercise period for vested stock
options issued to the Executive to the earlier of: (i) one hundred and
sixty-five (165) calendar days from the Termination Date; or (ii) the original
term of the stock option grant.

All other compensation (including, without limitation, salary, bonuses and
commissions) and employee benefits (including, without limitation, short-term
and long-term disability insurance, Paid Time Off accrual, and vesting of equity
compensation) will cease on the Officer's Termination Date. Payments under the
Section 16 Plan will not be subject to 401(k) or Employee Stock Purchase Plan
deductions. Except as provided herein, all equity compensation grants are
subject to the terms and conditions of the applicable plan document(s).

V.       DEFINITIONS

         A.       "Cause" shall mean (i) an act of theft, embezzlement or
intentional dishonesty by the Officer in connection with his/her employment;
(ii) the Officer being convicted of a felony, (iii) a willful act by the Officer
which constitutes gross misconduct and which is injurious to the Company, or
(iv) following delivery to the Officer of a written demand for performance from
the Company which describes the basis for the Company's reasonable belief that
the Officer has not substantially performed

                                      2

3Com Corporation Section 16 Officer Severance Plan  Amended and Restated 9/11/06
<PAGE>

his/her duties, continued violation(s) of the Officer's obligations to the
Company which are demonstrably willful and deliberate on the Officer's part.

         B.       "Termination Date" shall mean the Officer's last date of
employment with 3Com Corporation.

         C.       "Voluntary Termination for Good Reason" shall mean the
Officer's voluntary resignation within thirty (30) days after the occurrence of
any of the following events without the Officer's consent: (i) a material
reduction of the Officer's material duties or title, relative to the Officer's
material duties or title as in effect immediately prior to such reduction; (ii)
a material reduction by the Company in the base salary of the Officer as in
effect immediately prior to such reduction, other than a reduction generally
applicable to other Officers; or (iii) the permanent relocation of the Officer
to a work location more than fifty (50) miles from the Officer's then present
work location; provided, however, that no grounds for Voluntary Termination for
Good Reason shall exist hereunder unless the Officer provides 3Com with thirty
(30) days' advance written notice of his/her resignation, specifying the
purported grounds for the Voluntary Termination for Good Reason, and provides
the Company with the opportunity to cure the above-referenced event(s) on which
the resignation based.

VI.      FORM OF PAYMENT
The severance amount provided for in Section IV(A)(1) above shall be paid
through the Company's regular, semi-monthly payroll practices and shall continue
for twelve (12) months, provided that the Officer has executed and has not
revoked his/her signature to the Release Agreement and the Officer continues to
comply with all terms and conditions of the Release Agreement during the twelve
(12) month period.

VII.     INTERNAL REVENUE CODE SECTION 409A
Notwithstanding any other provisions of this Summary Plan Description, if the
Company reasonably determines in its discretion that Section 409A of the
Internal Revenue Code, as amended, will result in the imposition of additional
taxes or penalties based on the payment of the benefit provided under Section
IV(A) above to an Officer within the first six (6) months following the
Termination Date, the Company will modify the payment schedule to provide that
the payments will begin on the first regularly scheduled payroll date following
the expiration of six (6) months and one (1) day after the Termination Date. If
the payment schedule is modified pursuant to this Section VII, the Officer will
receive the one (1) year of annualized salary paid through the Company's regular
payroll practices over the twelve (12) payroll dates immediately following the
expiration of six (6) months and one (1) day after the Termination Date.

VIII.    FUNDING
Benefits provided pursuant to the Section 16 Plan shall be paid solely out of
3Com's general assets. 3Com shall not be required to fund or otherwise provide
for the payment of benefits provided hereunder in any other manner.

IX.      CLAIMS AND REVIEW PROCEDURES
If an Officer believes that he/she is entitled to a benefit under the Section 16
Plan, or a benefit in an amount greater than he/she has received, the Officer
may file a claim by writing to the Section 16 Plan Administrator. The Section 16
Plan Administrator is the named fiduciary that has the discretionary power and
authority to act with respect to any appeal from a denial of a claim for
benefits under the Section 16 Plan by performing a full and fair review of the
denial, and such actions shall be final and binding on all persons. Benefits
under the Section 16 Plan shall be payable only if the Section 16 Plan
Administrator determines, in its sole discretion, that an eligible Officer is
entitled to them. Any claim must be filed no later than forty-five (45) days
after the Officer's Termination Date.

                                       3

3Com Corporation Section 16 Officer Severance Plan  Amended and Restated 9/11/06
<PAGE>

         A.       Initial Claim. The Section 16 Plan Administrator will notify
the Officer in writing within ninety (90) days (or 180 days if special
circumstances require an extension of time for processing the claim) of receipt
of the claim as to whether the claim is granted or denied. Note that if an
extension is necessary, the Section 16 Plan Administrator will provide the
Officer with written notice of the extension (including the circumstances
requiring extension and date by which a decision is expected to be rendered)
before the initial ninety (90) day period expires. If the claim is denied, the
Officer will be given (1) specific reasons for the denial, (2) specific
reference to the Section 16 Plan provision(s) on which the denial is based, (3)
a description of any information or material necessary to support the claim and
an explanation of why such information or material is necessary, (4) an
explanation of the Section 16 Plan's claim appeal procedure (including a
statement of the Officer's right to bring a civil action under the Employee
Retirement Income Security Act of 1974 ("ERISA") following a denial of the claim
upon appeal), and (5) a statement that the Officer is entitled to receive, upon
request and free of charge, reasonable access to, and copies of all documents,
records or other information relevant (as defined by Department of Labor
regulation section 2560.503-1(m)) to the claim.

         B.       Appeals. If the claim is denied, the Officer has sixty (60)
days after notice of the denial to file a written appeal with the Section 16
Plan Administrator. During the review process, the Officer has the right to
submit written comments, documents, records, and other information relating to
the claim for benefits, which will be considered without regard to whether such
items were considered in the initial benefit determination. Also, the Officer
may, upon request and free of charge, have reasonable access to, and copies of,
all documents, records and other information relevant (as defined by Department
of Labor regulation section 2560.503-1(m)) to the claim for benefits.

         The Section 16 Plan Administrator will notify the Officer in writing
within sixty (60) days (or 120 days if special circumstances require an
extension of time for processing the appeal) of receipt of the appeal as to its
decision on review, unless the Section 16 Plan Administrator determines that
special circumstances exist requiring an extension of time. If the Section 16
Plan Administrator determines that an extension is necessary, the Section 16
Plan Administrator will provide the Officer with written notice (including the
circumstances requiring the extension and date by which a decision is expected
to be rendered) before the initial sixty (60) day period expires.

         If the Section 16 Plan Administrator denies the appeal, it will provide
a written denial of the claim upon appeal. The written denial shall include the
specific reason or reasons for the denial, specific references to the Section 16
Plan provisions on which the denial is based, a statement that the Officer is
entitled to receive, upon request and free of charge, reasonable access to, and
copies of all documents, records or other information relevant (as defined in
Department of Labor regulation section 2560.503-1(m)) to the claim, and a
statement of the Officer's right to bring an action under Section 502(a) of
ERISA.

         All determinations, interpretations, rules, and decisions of the
Section 16 Plan Administrator or its delegate shall be conclusive and binding
upon all persons having or claiming to have any interest or right under the
Section 16 Plan and shall be given deference in any judicial or other
proceeding.

         C.       Exhaustion of Claims Procedures. In no event shall an Officer
or any other person be entitled to challenge a decision of the Section 16 Plan
Administrator in court or in any other administrative proceeding unless and
until the claim and appeal procedures described above have been fully complied
with and exhausted.

X.       ADMINISTRATION
The Section 16 Plan Administrator administers the Section 16 Plan. The Section
16 Plan

                                       4

3Com Corporation Section 16 Officer Severance Plan  Amended and Restated 9/11/06
<PAGE>

Administrator is exclusively authorized to interpret the provisions of this
Summary Plan Description. The Section 16 Plan Administrator's interpretation
and/or application of any term or provision of the Section 16 Plan shall be
final and binding. The Section 16 Plan Administrator shall have full and
unfettered authority and responsibility for administration of the Section 16
Plan, including the discretionary authority to determine eligibility for
benefits and amounts of benefit entitlements and to interpret the terms of the
Section 16 Plan.

XI.      AMENDMENT AND TERMINATION
The Company reserves the right to amend or terminate the Section 16 Plan at any
time, with or without notice. All material changes to the Section 16 Plan must
be approved by the 3Com Corporation Board of Directors (the "Board") or the
Compensation Committee of the Board.

Information Required By ERISA:

         Plan Name
         3Com Section 16 Officer Severance Plan

         Plan Sponsor
         3Com Corporation
         350 Campus Drive
         Marlborough, MA 01752-3064

         Plan Administrator
         The Section 16 Plan Administrator shall be the Compensation Committee
         of the Board. Communications with the Section 16 Plan Administrator
         must be in writing and addressed to:

                           Senior Vice President, Human Resources
                           3Com Corporation
                           350 Campus Drive
                           Marlborough, MA 01752-3064

         Type of Plan
         The Section 16 Plan is a welfare plan providing for severance benefits.

         Employer Identification Number
         The 3Com Employer Identification Number is 94-2605794. When writing
         about the Section 16 Plan, an Officer should include this number.

         Plan Number
         For the purpose of identification, 3Com has assigned the Section 16
         Plan the number 517. All communications concerning the Section 16 Plan
         should include this reference number.

         Service of Legal Process
         Service of legal process may be made on the Section 16 Plan
         Administrator at the address above.

XII.     ENTIRE PLAN; AMENDMENTS
This Summary Plan Description contains all the terms, conditions and benefits
relating to the Section 16 Plan. No employee, officer, or director of the
Company has the authority to alter, vary or modify the terms of the Section 16
Plan, other than by means of an authorized written amendment to the Section 16
Plan approved by the Section 16 Plan Administrator. No oral or written
representations contrary to the terms of the Section 16 Plan and its written
amendments shall be binding upon the Section 16 Plan, the Section 16 Plan
Administrator or the Company.

                                       5

3Com Corporation Section 16 Officer Severance Plan  Amended and Restated 9/11/06
<PAGE>

XIII.    NO CONTRACT OF EMPLOYMENT
Nothing herein is intended to or shall be considered a contract of employment or
for any period of employment or a guarantee of future employment with the
Company.

XIV.     NO ASSIGNMENT OF RIGHTS
No eligible Officer shall have the right to assign, delegate or otherwise
transfer, either in full or in part, any of his/her rights or obligations under
the Section 16 Plan and any such assignment, delegation or other such transfer
shall be void.

XV.      APPLICABLE LAW; VENUE
Except where preempted by ERISA, the Section 16 Plan shall be construed in
accordance with, and all disputes hereunder shall be governed by, the laws of
the Commonwealth of Massachusetts without regard to its conflict of laws rules.
All legal actions arising under or relating to the Section 16 Plan shall be
subject to the jurisdiction and venue of the United States District Court for
the District of Massachusetts sitting in Boston, Massachusetts.

XVI.     ERISA RIGHTS
If you are an eligible Officer who is a participant in the Section 16 Plan, you
are entitled to certain rights and protections under ERISA.

Receive Information About Your Plan and Benefits. ERISA provides that you are
entitled to:

         (1)      Examine, without charge, at the office of the Section 16 Plan
                  Administrator or its delegate all Section 16 Plan documents,
                  including copies of any documents filed by the Section 16 Plan
                  with the U.S. Department of Labor, such as Section 16 Plan
                  descriptions.

         (2)      Obtain copies of all Section 16 Plan documents and other
                  Section 16 Plan information upon written request to the
                  Section 16 Plan Administrator. The Section 16 Plan
                  Administrator may impose a reasonable charge for the copies.

         (3)      Receive a copy of the Section 16 Plan's financial report, if
                  any. The Section 16 Plan Administrator may be required by law
                  to furnish each participant with a copy of the summary annual
                  report.

Prudent Actions By Fiduciaries. In addition to creating rights for the Section
16 Plan participants, ERISA imposes duties upon the people who are responsible
for the operation of the Section 16 Plan. The people who operate the Section 16
Plan, called "fiduciaries" of the Section 16 Plan, have a duty to do so
prudently and in the interest of you and other Section 16 Plan participants and
beneficiaries.

No one may fire you or otherwise discriminate against you in any way to prevent
you from obtaining a benefit or exercising your rights under ERISA.

Enforce Your Rights. If your claim for any Section 16 Plan benefit is denied or
ignored, in whole or in part, you have a right to know why this was done, to
obtain copies of documents relating to the decision without charge, and to
appeal any denial, all within certain time schedules.

Under ERISA, there are steps you can take to enforce the above rights. For
instance, if you request materials from the Section 16 Plan and do not receive
them within thirty (30) days, you may file suit in a federal court. In such
case, the court may require the Section 16 Plan Administrator to provide the

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3Com Corporation Section 16 Officer Severance Plan  Amended and Restated 9/11/06
<PAGE>

materials and pay you up to $110 a day until you receive the materials, unless
the materials were not sent because of reasons beyond the control of the Section
16 Plan Administrator.

If you have a claim for a benefit that is denied or ignored, in whole or in
part, you may file suit in a state or federal court. If it should happen that
Section 16 Plan fiduciaries misuse the Section 16 Plan's money, or if you are
discriminated against for asserting your rights, you may seek assistance from
the U.S. Department of Labor or you may file suit in a federal court. The court
will decide who should pay court costs and legal fees. If you are successful,
the court may order the person you have sued to pay these costs and fees. If you
lose, the court may order you to pay these costs and fees, for example, if it
finds your claim is frivolous.

Assistance With Your Questions. If you have questions about the statements made
in this summary or your rights under ERISA, you should contact the Section 16
Plan Administrator or the nearest Area Office of the Employee Benefits Security
Administration, U.S. Department of Labor, listed in your telephone directory, or
the Division of Technical Assistance and Inquiries, Pension and Welfare Benefits
Administration, U.S. Department of Labor, 200 Constitution Avenue, Washington,
D.C. 20210.

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3Com Corporation Section 16 Officer Severance Plan  Amended and Restated 9/11/06

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