Document:

<PAGE>

    Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

                                                                    Exhibit 10.9
                                                                    ------------

       This AMENDMENT AND RESTATEMENT OF JOINT MARKETING AND SERVICES AGREEMENT
  (this "Amendment"), dated as of May __, 2000, is by and between
  StorageNetworks, Inc., a Delaware corporation ("StorageNetworks") and
  GlobalCenter Inc., a Delaware corporation (individually, "GlobalCenter" and
  collectively, with StorageNetworks, the "Parties").

                                   WITNESSETH
                                   ----------

     WHEREAS, StorageNetworks and GlobalCenter (referred to therein as Global
  Crossing Ltd.) are parties to that certain Joint Marketing and Services
  Agreement, dated as of October 29, 1999 (the "Agreement");

     WHEREAS, the Parties acknowledge that, as a result of a scrivener's error,
  GlobalCenter Inc. was incorrectly referred to as Global Crossing Ltd. in the
  Agreement;

     WHEREAS the Parties further acknowledge that GlobalCenter has been, and
  will continue to be, responsible for all of the obligations and undertakings
  set forth in the Agreement;

     WHEREAS, StorageNetworks and GlobalCenter desire to amend and restate the
  Agreement as provided herein; and

       WHEREAS, capitalized terms used herein and not otherwise defined shall
  have the meanings set forth in the Agreement;

     NOW, THEREFORE, in consideration of the premises and covenants contained
  herein, and for other good and valuable consideration, the receipt and
  sufficiency of which are hereby acknowledged, the Parties hereto agree to
  amend and restate the Agreement as follows:

1.   SCOPE OF AGREEMENT

1.1.  The Parties desire to establish a cooperative program (the "Program") for
the design, installation and management of enterprise storage services and the
performance of professional services (collectively, the "Services") to current
and potential Customers through StorageNetworks Storage Points of Presence ("S-
POPs") S-POPs located in GlobalCenter Data Centers ("GDCs").

1.2.  "Customers" shall mean any current and prospective customers who are (i)
hosted in GDCs and uses any Services provided through S-POPs in any GDCs, (ii)
not hosted in GDCs but use any Services provided through S-POPs in any GDCs
(except as otherwise mutually agreed to by the Parties) and (iii) hosted in GDCs
and use Services provided remotely through S-POPs located in facilities owned by
StorageNetworks or other third parties.

1.3.  "Services" shall mean all current and future StorageNetworks managed data
storage service offerings and professional services related to such data storage
service offerings; provided, however, that prior to offering any new service in
or through a GDC (other than StorageNetworks' existing DataPACS, SafePACS,
BackPACS and NetPACS services), StorageNetworks must obtain GlobalCenter's prior
written approval (which approval may be withheld in GlobalCenter's sole
discretion).  Notwithstanding anything to the contrary set forth herein, in the
event GlobalCenter does not approve of StorageNetworks' offering of any such new
managed data storage service (a "Refused Service"), GlobalCenter agrees that it
shall not subsequently enter into an agreement with

This information (data) contained in this Agreement constitutes a trade secret
and/or information that is commercial or financial and confidential or
privileged.
<PAGE>

another third party to offer a service substantially similar to such Refused
Service without allowing StorageNetworks to offer the Refused Service as well.

1.4.  The parties shall share revenues derived from the Services in accordance
with the terms and conditions set forth in Exhibit A hereto.

2.  TERM

2.1.  The term of this Agreement shall continue until May 31, 2003 (the "Initial
Term").

2.2.  Each Party has the right to extend the Agreement for an additional twenty-
four (24) month term, following the conclusion of the Initial Term provided such
Party exercises this option not less than ninety (90) days prior to the
expiration date of the Initial Term by giving written notice to the other Party,
and provided that the other Party does not decline the extension within 30 days
of its receipt of such notice.

3.  UNDERTAKINGS

3.1.  STORAGENETWORKS UNDERTAKINGS

3.1.1.  StorageNetworks shall provide professional services to Customers and
high-availability enterprise data storage services to Customers at agreed upon
GDCs and, outside such GDCs, within such distances as current technology
permits.

3.1.2.  StorageNetworks shall develop, co-market, deliver and support the
Services as more fully described in the Operations and Implementation Plan
attached hereto as Exhibit B.

3.2.  GLOBALCENTER UNDERTAKINGS

3.2.1.  GlobalCenter shall provide space, power and connectivity to meet the S-
POP requirements set forth in Exhibit D for the Services and shall work with
StorageNetworks to develop, co-market, deliver and support the Services as more
fully described in Exhibit B.

3.2.2.  GlobalCenter shall maintain services to the S-POPs located at the GDCs
at the levels specified in the master service agreement attached hereto as
Exhibit E (the "GlobalCenter MSA").  In addition, the Parties shall execute the
GlobalCenter MSA and shall enter into GlobalCenter Service Orders for space to
be licensed to StorageNetworks pursuant to this Agreement in substantially the
form of Exhibit C attached hereto.  StorageNetworks shall pay for such space at
the rates set forth in Exhibit A.

3.2.3.  GlobalCenter shall provide StorageNetworks with the ability to obtain
additional space within GDCs as determined by the business needs of
StorageNetworks and GlobalCenter to support this Agreement upon terms mutually
agreeable to the Parties.

3.2.4.  In addition to all current GDC locations owned solely by GlobalCenter,
during the term of this Agreement, GlobalCenter shall allow StorageNetworks to
deliver the Services to all future GDC locations owned solely by GlobalCenter
upon the same terms set forth in Exhibit A and the GlobalCenter MSA.  In
addition, during the term of this Agreement, upon the written request of
StorageNetworks, GlobalCenter shall use commercially reasonable efforts to give
StorageNetworks the ability to deliver Services at future GDCs owned, but not
solely owned, by GlobalCenter on terms substantially similar to those set forth
in Exhibit A and the GlobalCenter MSA.  Notwithstanding anything to the contrary
set forth herein, to allow GlobalCenter to effectively forecast space
requirements for any new GDC, if StorageNetworks does not notify GlobalCenter of
its intent to deliver Services in any GDC within thirty (30) days of
GlobalCenter's written notification (including any e-mail which GlobalCenter
confirms has been received by StorageNetworks' Executive Vice

This information (data) contained in this Agreement constitutes a trade secret
and/or information that is commercial or financial and confidential or
privileged.
<PAGE>

President of Operations) to StorageNetworks of a planned GDC, GlobalCenter shall
not be required to allow StorageNetworks to deliver Services in such GDC.

4.  SUBCONTRACTING

4.1.  Where the nature of the Services so requires, either Party may retain such
employees, agents or subcontractors on its own behalf and to its own account as
such Party in its discretion deems necessary to perform the said Services.

4.2.  Where a Party retains persons to perform Services for the other Party such
persons shall at all material times be considered employees, agents or
subcontractors of the retaining Party, and not the other Party. All obligations
owed to such persons incidental to an employer/employee relationship shall be
the sole responsibility of the retaining Party.

5.  IMPLEMENTATION PLAN

5.1.  The Parties shall establish and implement the Program in accordance with
the Operations and Implementation Plan, attached hereto as Exhibit B (the
"Implementation Plan").

6.  PROGRAM RESPONSIBILITIES

6.1.  GLOBALCENTER RESPONSIBILITIES.

6.1.1.  GlobalCenter hereby covenants to perform the following activities in
connection with the Program, at its own and sole expense (except as otherwise
set forth herein):

 .  GlobalCenter shall provide suite-like facilities in a secure, caged
environment for all S-POPs in accordance with this Agreement.

 .  GlobalCenter shall promote, market and support the Services to current and
potential Customers that are or may be hosted at GDCs.

 .  GlobalCenter shall integrate the Services into GlobalCenter's existing sales
distribution channels and include the Services in its catalogues and list the
Services in its price lists.

 .  GlobalCenter shall integrate the Services into GlobalCenter's marketing and
sales support programs, including trade show involvement and support.

 .  GlobalCenter shall provide a Program Director to perform the following
functions:

1.  Serve as marketing/sales liaison between the StorageNetworks and
GlobalCenter sales forces.

2.  Develop GlobalCenter sales programs to target new prospects and key
accounts.

3.  Support the preparation of Services proposals.

4.  Plan and conduct Customer visits.

5.  Coordinate Customer engagements and contracts

6.  Address operational issues concerning the Services

This information (data) contained in this Agreement constitutes a trade secret
and/or information that is commercial or financial and confidential or
privileged.
<PAGE>

 .  GlobalCenter shall use the Services for internal usage (e.g. information
technology and applications) and internally developed or outsourced products if
GlobalCenter deems the Services suitable in terms of function and price.

 .  GlobalCenter will plan and coordinate with StorageNetworks sales, marketing
and related activities and inducements of the type detailed on Exhibit H.

6.2.  STORAGENETWORKS RESPONSIBILITIES

6.2.1.  StorageNetworks hereby covenants to perform the following activities in
connection with the Program, at its own and sole expense:

 .  StorageNetworks shall provide all hardware, software, network equipment and
personnel required to deliver the Services.

 .  StorageNetworks is responsible to orient appropriate GlobalCenter Operations,
Sales, Professional Services and Product Management staff on the Services prior
to release of said Services.  StorageNetworks will orient additional
GlobalCenter personnel as appropriate.  Additionally, StorageNetworks is
responsible to ensure that StorageNetworks support personnel are adequately
trained as required to provide support to GlobalCenter Customers with respect to
the data storage Services.

 .  StorageNetworks shall promote and market the Services to StorageNetworks
customers in and around locations with GDCs.  StorageNetworks shall refer to and
recognize GlobalCenter as a "Preferred Hosting Service Partner" and will use
commercially reasonable efforts to proactively direct business as early in the
customer engagement cycle as possible towards GDC locations in order to make
this Agreement more successful.  Notwithstanding the foregoing, GlobalCenter
acknowledges that, while StorageNetworks has agreed to use commercially
reasonable efforts to cause such customers to use GDCs, those customers are free
to procure such Services at a third party facility and nothing contained in this
paragraph shall be viewed as a guarantee that StorageNetworks to will ultimately
succeed in causing its customers to procure such Services at any applicable GDC.
Furthermore, StorageNetworks agrees that it will not offer "Preferred Hosting
Service Partner" status (or any substantially similar designation or
relationship) to any other hosting provider.

 .  StorageNetworks shall provide a Program Director to perform the following
functions:

1.  Serve as marketing/sales liaison between the StorageNetworks and
GlobalCenter sales forces.

2.  Develop StorageNetworks sales programs to target new prospects and key
accounts.

3.  Support the preparation of proposals.

4.  Plan and conduct Customer visits.

5.  Address operational, customer engagement and related matters.

7.  PROGRAM MANAGEMENT

7.1.  Management Personnel and Meetings.  Each Party shall designate one (1)
employee to serve as that Party's executive representative for the Program
(each, an "Executive Representative").  The Executive Representatives will
oversee and direct the activities of the Program.  The Executive Representatives
shall meet as frequently as necessary, but in no event less than four (4) times
per year.

Each Party shall designate one or more program director(s) (each, a "Program
Director") to manage that Party's day-to-day sales and operational activities in
accordance with this Agreement and direction from the Executive

This information (data) contained in this Agreement constitutes a trade secret
and/or information that is commercial or financial and confidential or
privileged.
<PAGE>

Representatives. The Program Directors shall meet as frequently as necessary,
but in no event less than four times per year. If the Program Directors cannot
resolve an issue, they shall submit such issue to the Executive Representatives
for resolution.

Each Party shall provide the other Party written notice of a change in a
designated Executive Representative or Program Director and identify an
appropriate replacement, in writing as soon as practicable thereafter.

Each party agrees to conduct a joint annual review of the agreement inclusive of
operations, costs, prices and historical performance.

7.2.  Key Business Objectives.  The Parties may develop business and performance
objectives (the "Objectives") for the Program.  The Objectives may address
targets for implementation schedule, revenue and sales incentives.  If adopted,
the Executive Representatives shall review and modify the Objectives on an
annual basis.

7.3.  Customer Engagement.  StorageNetworks shall contract with all Customers
for the delivery of the Services.  In connection therewith, (a) all Customer
contracts must be approved, in advance, by GlobalCenter (and GlobalCenter shall
respond to any written request (including e-mail) for approval within one (1)
business day; provided, however, that GlobalCenter shall only be required to
respond in such time frame to the extent that StorageNetworks follows any such
written request with a phone call to confirm that an authorized GlobalCenter
Representative has actually received such request), (b) StorageNetworks shall
provide GlobalCenter a copy of each executed Customer contract within twenty
(20) days of the execution of such contract and (c) StorageNetworks shall not,
without GlobalCenter's prior written consent, provide any Services to Customers
unless and until any such Customer executes a written contract.  In the event
that GlobalCenter disapproves of any such contract, (i) GlobalCenter shall not
subsequently provide substantially similar services to such Customer through a
competitive third party provider without first giving StorageNetworks the
opportunity to provide the co-branded Services to such Customer on substantially
similar terms and (ii) GlobalCenter shall not share any confidential information
received from StorageNetworks in connection with any such disapproved contract
with any competitive third party provider of such services.

7.4.  Marketing/Advertising and Promotional Material.  The Parties shall jointly
design and develop all marketing materials to be used in connection with the
Services (the "Marketing Materials").  All press releases, advertising and
promotional material relating to the Program shall be approved in advance by
each Party.  The Parties shall designate marketing representatives to coordinate
all advertising and promotional material relating to the Program.  Each party
shall be responsible for its own internal time and expenses utilized to develop
the Marketing Materials. The reasonable out-of-pocket costs of developing,
preparing, conducting, delivering and/or distributing all joint marketing
activities and collateral shall be borne equally by the Parties.  In addition,
the Parties shall work together to discuss the creation of a joint marketing
fund which will be used primarily to publicize the launch of new S-POPs in GDCs
around the world.

7.5.  Project Teams.  Each party shall select a project team to guide the
implementation and release of the Services.  A roster for such teams and the
team members' responsibilities is attached as Exhibit H.

7.6.  Responsibility for Personnel.  Each Party shall have responsibility for
all acts and omissions of their respective personnel with respect to the
performance of this Agreement.

7.7.  Personnel Related Benefits and Taxes.  Neither Party shall have any
obligation for any employee-related benefits applicable to the other Party's
personnel performing services pursuant to this Agreement.  Each Party shall be
responsible for their employees' portion of FICA and for withholding income for
federal and state income tax purposes to the extent required by law.

This information (data) contained in this Agreement constitutes a trade secret
and/or information that is commercial or financial and confidential or
privileged.
<PAGE>

8.  CHARGES, PAYMENT AND INVOICING

8.1.  Initially, StorageNetworks shall invoice Customers for all Services
delivered, made available or contracted for by Customers.  Notwithstanding the
foregoing, the Parties agree that, at any time in the future, upon sixty (60)
days written notice to StorageNetworks, GlobalCenter may assume the
responsibility for invoicing Customers for the Services.  StorageNetworks agrees
to use all commercially reasonable efforts to cooperate in transitioning any
billing functions to GlobalCenter at the time of any such request.

8.2.  StorageNetworks will pay to GlobalCenter, forty-five (45) days following
the end of any calendar month, a percentage of the aggregate revenues
recognized, in accordance with GAAP, by StorageNetworks with respect to all
Customers during such month, such percentage to be determined in accordance with
Exhibit A hereto.  In order to allow GlobalCenter to verify the appropriate
payment amounts, together with such payment, StorageNetworks shall provide to
GlobalCenter a true and accurate summary of the aggregate amounts owed by
Customers for each Service provided through any S-POP in a GDC or any services
provided remotely to any Customer during the applicable month.  Such summary
shall include not only the total amounts owed by all Customers, but shall also
include an itemized breakdown of Customers and the Services provided to such
Customers.  Upon GlobalCenter's written request, StorageNetworks shall make
available to GlobalCenter copies of all invoices delivered to Customers;
provided, however, that GlobalCenter shall be entitled to request such copies no
more than four (4) times per calendar year (except to the extent that invoices
made available pursuant to any request evidence an underpayment to GlobalCenter
of greater than 5%, in which case such request shall not be considered one of
GlobalCenter's allotted requests).

8.3.  GlobalCenter shall have the right, upon not less than thirty (30) days
written notice, to audit StorageNetworks' books and records as they relate to
the Services.  GlobalCenter may exercise this right no more often than twice per
calendar year unless pursuant to any such audit an underpayment to GlobalCenter
in excess of 5% is discovered, in which case such audit shall not be considered
one of GlobalCenter's allotted audits.  All information provided to GlobalCenter
in connection with any such audit and any information GlobalCenter learns solely
as a result of such audit shall be considered confidential information and shall
be subject to the confidentiality provisions set forth in Article 9 of this
Agreement.  GlobalCenter shall bear all of its costs in connection with any such
audit and shall reimburse StorageNetworks for any reasonable out-of-pocket costs
incurred by StorageNetworks in connection with such audit; notwithstanding the
foregoing, in the event that the results of such audit reveal that GlobalCenter
has been undercompensated by more than five percent (5%), StorageNetworks shall
bear all costs in expenses (including, without limitation, GlobalCenter's
reasonable costs and expenses) in connection with such audit.  Such audits will
be conducted during normal business hours.  To the extent that GlobalCenter
engages any third party to conduct such audit, such third party shall be
required to execute an appropriate confidentiality agreement (substantially
similar to Article 9 of this Agreement) with StorageNetworks in advance of such
audit.

8.4.  StorageNetworks shall pay GlobalCenter for any GDC space (including all
power and connectivity required in accordance with Exhibit D) provided to
StorageNetworks in accordance with GlobalCenter MSA and any related Service
Orders in accordance with the schedule of charges for such space set forth in
Exhibit A.  GlobalCenter shall issue invoices to StorageNetworks in accordance
with the terms of the GlobalCenter MSA, itemizing the amounts payable for each
in connection with each such GDC.

8.5.  StorageNetworks shall issue payment by check, wire transfer, or as
otherwise agreed no later than thirty (30) days following receipt of an invoice,
except for those items in such invoice disputed in good faith.

9.  CONFIDENTIALITY

9.1.  The Parties acknowledge, understand and agree that the performance of this
Agreement may require the disclosure to the other of, or each may come to know,
trade secrets, proprietary and confidential information and know-how of the
other relating to aspects of their products, businesses, competitive activities
or relationships, and that their respective businesses and competitive positions
require that said trade secrets and all such proprietary and confidential
information and know-how continue to remain secret and confidential.

This information (data) contained in this Agreement constitutes a trade secret
and/or information that is commercial or financial and confidential or
privileged.
<PAGE>

GlobalCenter and StorageNetworks each represents and warrants to the other that
it shall not use or gain any competitive advantage from said secrets and
information of the other party to the detriment of such party.

Each party ("Recipient") shall keep confidential all secret, confidential or
proprietary information, knowledge or data of the other that is submitted to it
in writing marked confidential, or conveyed orally to the other with the
understanding that it is proprietary, secret or otherwise confidential. This
obligation of confidence shall not apply to (a) any such information that is
currently or subsequently becomes part of the public domain, unless wrongfully
placed in the pubic domain by the Recipient, (b) information which is rightfully
obtained from any third party who is not then bound by an obligation to maintain
such information in confidence or is developed independently by Recipient (as
evidenced by contemporaneous written records maintained in the ordinary course
of business), or (c) information which was known to Recipient prior to its
disclosure pursuant to or in anticipation of this Agreement (as evidenced by
contemporaneous written records maintained in the ordinary course of business)
provided that the source of such information was not bound by any obligation to
maintain such information in confidence.

The Recipient shall not be prohibited from releasing such information when such
disclosure is required by law, regulation or pursuant to legal process or is
incidental to the performance of the Recipient's obligations hereunder;
provided, however, that the Recipient, upon receipt of a subpoena or other such
similar order or legal process, shall promptly give written notice to the
disclosing party to enable the disclosing party to seek a protective order or
other such appropriate relief.

Neither GlobalCenter nor StorageNetworks will use each other's trademarks,
service marks or other proprietary information without the prior written consent
of the other party. In addition to the foregoing, the terms and conditions of
this Agreement shall be deemed confidential information; provided, however, the
fact of the existence of this Agreement may be disclosed in accordance with the
aforementioned circumstances.

10.  EXCLUSIVITY

10.1.  This Agreement shall in no way restrict either Party's ability to market
or provide its services or products to any end-user of such services or in
conjunction with any third party or parties.

10.2.  StorageNetworks agrees that, during the term of this Agreement, if it
determines to locate an S-POP in any metropolitan area in which (i)
StorageNetworks does not currently have an S-POP and (ii) GlobalCenter has an
operational or planned facility capable of supporting an S-POP in accordance
with the requirements set forth in Exhibit D, StorageNetworks will provide
GlobalCenter a right of first refusal to host such new S-POP, exercisable within
ten (10) days of StorageNetworks' notice to GlobalCenter of its intention to
locate such S-POP.  This right of first refusal shall apply only to the first S-
POP StorageNetworks determines to locate in such metropolitan area and shall not
apply if (a) a customer or customers who are or have already committed to
another provider's facilities and then choose to seek services from
StorageNetworks or (b) GlobalCenter is not able to meet StorageNetworks timeline
or other specifications for such S-POP.

10.3.  No contract entered into between StorageNetworks and any Customer may be
transferred to an S-POP in any non-GlobalCenter hosting facility.  In the event
that any Customer transfers to another hosting provider for reasons outside of
GlobalCenter's sole control, including, without limitation, GlobalCenter's
failure to meet its service levels for any other service provided to such
Customer by GlobalCenter,  and continues to receive Services at such other
facility, StorageNetworks agrees to continue to pay GlobalCenter the applicable
payment percentage, in accordance with Exhibit A, as if such Customer were still
in a GDC for the remainder of the original term of such Customer's contract
entered into pursuant to this Agreement.

11.    TERMINATION

11.1.  Termination for Cause.   Either Party may terminate this Agreement upon
thirty (30) days prior written notice if the other Party breaches any material
provision of this Agreement and fails to cure such breach within the thirty

This information (data) contained in this Agreement constitutes a trade secret
and/or information that is commercial or financial and confidential or
privileged.
<PAGE>

(30) day notice period. In the event of a termination pursuant to this Section,
the Parties will attempt to negotiate in good faith an appropriate transition
for any joint sales, marketing or operations activities in progress.

11.2.  Effect of Termination or Expiration.  The termination or expiration of
this Agreement shall terminate the obligations of the Parties to perform any
joint marketing activities hereunder but no such termination shall have any
effect on any existing agreements with Customers for Services, which will
continue in full force and effect until terminated as per the terms of the
individual Customer agreements.  For the avoidance of doubt, StorageNetworks
shall pay to GlobalCenter (i) the applicable percentage of service revenues for
all such existing Customer agreements through the terms of all such agreements
and (ii) the applicable price for licensed data center space necessary to
support such Customers, all in accordance with the terms of Exhibit A hereto.

11.3.  Post-Termination Relationship. Should this agreement be terminated or
expire, StorageNetworks may continue, at its option, to occupy any then
presently occupied S-POP space in any GDC on the standard terms and conditions
set forth in the GlobalCenter MSA.  The charges for any such space shall be
provided pursuant to a valid GlobalCenter Service Order and shall equal
GlobalCenter's then-current market rates for each such space (including any
minimum bandwidth requirements for such space in accordance with GlobalCenter's
then current standard practices).

12.  OWNERSHIP OF INTELLECTUAL PROPERTY

12.1.  Branding. Services shall be co-branded as determined by the Parties under
the direction and continuity of the Project Team marketing representatives. Said
Services, although branded under the GlobalCenter naming conventions, will be
marketed as being provided by and through StorageNetworks.  Both companies'
logos shall appear on all invoices, marketing or promotional materials utilized
in reference to the Services (e.g. websites, hardcopy data sheets, brochures).

12.2.  Trade/Service Marks. Trade and Service Marks associated with
GlobalCenter's promotion of the Services will, to the extent possible, be
jointly owned by the Parties.

12.3.  Intellectual Property Ownership.  Software and other intellectual
property developed by StorageNetworks at the request of GlobalCenter or in the
course of performing Services, shall remain the property of StorageNetworks.
Software and other intellectual property developed by GlobalCenter in the course
of supporting the Services, shall remain the property of GlobalCenter.

13.  WARRANTIES

13.1.  Each Party represents and warrants it has full power and authority to
enter into and perform this Agreement, and that the person signing this
Agreement on its behalf has been properly authorized to enter this Agreement.

14.  LIABILITY

14.1.  IN NO EVENT SHALL EITHER PARTY BE LIABLE TO THE OTHER FOR ANY SPECIAL,
INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES, WHETHER ARISING IN AN ACTION OF
CONTRACT, TORT OR OTHER LEGAL THEORY EVEN IF THE PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.

15.  DISPUTE RESOLUTION

15.1.  Neither Party may bring a dispute arising in connection with this
Agreement before any judicial or quasi-judicial entity unless and until the
aggrieved Party notifies the other Party of the claim and attempts to resolve
the dispute by causing the Executive Representatives to meet within thirty (30)
days following notice of a controversy or claim to attempt to resolve the
dispute in good faith.  Prior to such meeting, the Parties shall investigate the
circumstances of the dispute.

This information (data) contained in this Agreement constitutes a trade secret
and/or information that is commercial or financial and confidential or
privileged.
<PAGE>

15.2.  If the Parties' Executive Representatives cannot resolve the dispute at
this meeting, or the non-aggrieved Party refuses to cooperate, the aggrieved
Party may then pursue any and all available remedies.  In the event that the
non-aggrieved Party has refused to cooperate in the dispute resolution meeting
and the aggrieved Party ultimately prevails at trial or in another agreed to
form of alternate dispute resolution, the aggrieved Party may recover its
reasonable attorney's fees.

16.  INDEMNIFICATION

16.1.  GlobalCenter Indemnity.  GlobalCenter shall indemnify and hold
StorageNetworks, its parent, subsidiaries and affiliates, if any, and the
respective employees and agents of any of them, harmless from and against any
and all claims, liabilities, losses, damages and causes of action relating to
bodily injury, death, or property damage directly caused by the intentional or
negligent acts or omissions of GlobalCenter in the performance or nonperformance
by GlobalCenter of this Agreement; provided, however, that GlobalCenter shall
not be responsible for injury attributable to the acts or omissions of
StorageNetworks, its parent, subsidiaries and affiliates, if any, or the
respective agents and employees of any of them.

17.2.  StorageNetworks Indemnity.  StorageNetworks shall indemnify and hold
GlobalCenter, its parent, subsidiaries and affiliates, if any, and the
respective employees and agents of any of them, harmless from and against any
and all claims, liabilities, losses, damages and causes of action relating to
bodily injury, death, or property damage directly caused by the intentional or
negligent acts or omissions of StorageNetworks in the performance or
nonperformance by StorageNetworks of this Agreement; provided, however, that
StorageNetworks shall not be responsible for injury attributable to the acts or
omissions of GlobalCenter, its parent, subsidiaries and affiliates, if any, or
the respective agents and employees of any of them.

17.  GENERAL

17.1.  Independent Contractor.  Nothing contained in this Agreement shall be
deemed or construed as creating a joint venture or partnership between
GlobalCenter and StorageNetworks.  Neither Party is authorized as an agent,
employee or legal representative of the other Party.  Except as specifically set
forth herein, neither Party shall have power to control the activities and
operations of the other and their status is, and at all times will continue to
be, that of independent contractors.  Neither Party shall have any power or
authority to bind or commit the other.

17.2.  Headings.  Headings used in this Agreement are for reference only and
shall not be deemed a part of this Agreement.

17.3.  Applicable Law.  This Agreement shall be interpreted, construed and
governed by the internal laws of the State of New York, without regard to its
conflicts of law provisions.

17.4.  Assignment.  This Agreement and the rights and obligations may not be
assumed, assigned and/or delegated without the prior written consent of the
other Party other than to a corporation controlled by, controlling or under
common control with the assigning Party.

17.5.  Notices.   All notices, requests, demands, or communications required or
permitted hereunder shall be in writing, delivered personally or by telex,
telegram, or certified, registered, or express mail at the respective addresses
set forth above (or at such other addresses as shall be given in writing by
either Party to the other).  All notices, requests, demands or communications
shall be deemed effective upon personal delivery on the calendar day following
the date of the telex, telegram, or when received if sent by registered,
certified, or express mail.

17.6.  Entire Understanding.   This Agreement shall become binding when signed
by both Parties.  This Agreement constitutes the entire understanding of the
Parties hereto, and supersedes all prior or contemporaneous written and oral
agreements, regarding the subject matter hereof, including specifically and
without limitation the Letter

This information (data) contained in this Agreement constitutes a trade secret
and/or information that is commercial or financial and confidential or
privileged.
<PAGE>

of Intent dated as of August 12, 1999. Notwithstanding the foregoing, nothing
herein shall affect any nondisclosure agreement between the Parties entered into
prior to the Effective Date. This Agreement may not be modified or amended
except in writing signed by both Parties. No third party shall have any interest
herein or be deemed a third Party beneficiary of this Agreement.

17.7.  Excusable Delay.  If the performance of this Agreement, or of any
obligation hereunder, is prevented, restricted or interfered with by reason of
(i) acts of God; (ii) wars, revolution, civil commotion, acts of public enemies,
blockage or embargo; (iii) acts of any Government in its sovereign capacity;
(iv) labor difficulties, including, without limitation, strikes, slowdown,
picketing or boycotts; or (v) any other circumstances beyond the reasonable
control and without the fault or negligence of the Party affected, the Party
affected, upon giving prompt notice to the other Party, shall be excused from
such performance on a day-to-day basis.

17.8.  Survival.  The obligations of the Parties under this Agreement, which by
their nature would continue beyond termination, cancellation, or expiration of
this Agreement shall in all cases survive the termination, cancellation or
expiration of this Agreement.

17.9.  Waiver.  The failure of either Party to insist on the strict performance
of any terms, covenants and conditions of this Agreement at any time, or in any
one or more instances, or its failure to take advantage of any of its rights
hereunder, or any course of conduct or dealing shall not be construed as a
waiver or relinquishment of any such rights or conditions at any future time and
shall in no way effect the continuance in full force and effect of all the
provisions of this Agreement.

This information (data) contained in this Agreement constitutes a trade secret
and/or information that is commercial or financial and confidential or
privileged.
<PAGE>

  IN WITNESS WHEREOF, the Parties hereto have executed this Agreement on the
  date first written above.

  STORAGENETWORKS, INC.            GLOBALCENTER INC.

  By: ________________________     By: _______________________

  Title: _______________________   Title: ____________________

  Date: ______________________     Date: _____________________

This information (data) contained in this Agreement constitutes a trade secret
and/or information that is commercial or financial and confidential or
privileged.
<PAGE>

     EXHIBITS
--------------------------------------------------------------------------------
     EXHIBIT A:  Description of the Services

     EXHIBIT B:  Implementation Plan

     EXHIBIT C:  Service Order

     EXHIBIT D:  Key Business and Performance Objectives

     EXHIBIT E:  Facility Requirements

     EXHIBIT F:  GlobalCenter Master Service Agreement

     EXHIBIT G:  Mutual Inducements

     EXHIBIT H:  Project Teams

     EXHIBIT I:  Marketing Engagement Plan

     EXHIBIT J:  Sales Rules of Engagement

This information (data) contained in this Agreement constitutes a trade secret
and/or information that is commercial or financial and confidential or
privileged.

<PAGE>

         Confidential Materials omitted and filed separately with the
        Securities and Exchange Commission. Asterisks denote omissions.

EXHIBIT A DESCRIPTION REVENUES AND FLOOR SPACE
--------------------------------------------------------------------------------

SERVICES OVERVIEW
-----------------

  The managed data storage Services provide GlobalCenter "hosting" customers
  with access to a centralized data storage service.  The professional services
  provide Customers with assessment, implementation and design of storage
  solutions, both in conjunction with the managed data storage Services and
  independently.  In addition, the Services will include remote services
  provided to GlobalCenter "hosting" customers and services provided at S-POPs
  in GDCs to StorageNetworks customers that are not GlobalCenter "hosting"
  customers.

SERVICE REVENUES
----------------

  StorageNetworks will pay to GlobalCenter a percentage of all revenue due from
  Customers for Services (including, without limitation, any data storage,
  professional services and setup fees) during the term of this Agreement in
  accordance with the following table.  Such payments will be made in accordance
  with Section 8.2 of the Agreement.

<TABLE>
<CAPTION>
                         Term Year                                        Percentage
-----------------------------------------------------------------------------------------------
<S>                                                           <C>
Year 1 (from June 1, 2000 through May 31, 2001)                            [**]%
-----------------------------------------------------------------------------------------------
Remaining Term (from June 1, 2001 through the end of the                   [**]%
 Initial Term)
-----------------------------------------------------------------------------------------------
Any renewal term                                               To be negotiated by the Parties
-----------------------------------------------------------------------------------------------
</TABLE>

  *Notwithstanding the table above, GlobalCenter shall receive [**]% of all
  revenue from Customers for Services who enter into agreements for such
  services on or before May 31, 2000.

  ** The Parties acknowledge GlobalCenter's desire to obtain a greater
  percentage of the revenues derived from the Services if StorageNetworks
  achieves a gross margin percentage of greater than [**]% in its business (or,
  in the case of clause (c) below, a gross margin percentage of greater than
  [**]% in its business at GDCs before taking into account any amounts payable
  to GlobalCenter pursuant to this Agreement). StorageNetworks is willing to
  renegotiate the above revenue share percentages with the aim of permitting
  GlobalCenter to further participate in the increased efficiency of
  StorageNetworks operations reflected by the achievement of gross margin in
  excess of [**]%. Whether StorageNetworks has achieved a gross margin of
  greater than [**]% shall be determined: (a) if StorageNetworks has a class of
  publicly-traded securities or is otherwise subject to the reporting
  requirements of the Securities Exchange Act of 1934, from any publicly
  available filing StorageNetworks makes with the Securities and Exchange
  Commission; or (b) if StorageNetworks does not have a class of publicly traded
  securities or is otherwise not subject to the reporting requirements of the
  Securities Exchange Act of 1934, from StorageNetworks most recent audited
  financial statements; or (c) regardless of whether StorageNetworks has a class
  of publicly-traded securities or is otherwise subject to the reporting
  requirements of the Securities Exchange Act of 1934, if StorageNetworks
  establishes internal processes and record keeping that analyzes
  StorageNetworks gross margin percentage derived from its individual hosting
  service provider joint marketing and services agreements, from such records.

MOST FAVORED PARTNER
--------------------

  StorageNetworks agrees that in the event that a third party enters into a
  contract for Services, or any service, which is more advantageous (in its
  totality) to such third party in any respect than this Agreement is to
  GlobalCenter, GlobalCenter shall be notified of such agreement within five (5)
  days of its execution and shall be offered the ability to enter into a similar
  arrangement with StorageNetworks.  GlobalCenter shall have the right to engage
  an

This information (data) contained in this Agreement constitutes a trade secret
      and/or information that is commercial or financial and confidential or
                                  privileged.
<PAGE>

         Confidential Materials omitted and filed separately with the
        Securities and Exchange Commission. Asterisks denote omissions.

independent auditor, from one of the five nationally recognized accounting firms
not then-currently engaged by one of the Parties, to determine whether
StorageNetworks is in compliance with this provision.

FLOOR SPACE CHARGES
-------------------

StorageNetworks will pay a monthly fee for all space licensed by StorageNetworks
in GlobalCenter GDCs for S-POP data centers (such fee to include all power and
connectivity required in accordance Exhibit D). In connection with the execution
of this Agreement, the Parties will execute a GlobalCenter MSA which describes
the terms and conditions of such license. The applicable monthly fee shall be
determined as follows:

(a)  From the date hereof through April 30, 2001, StorageNetworks will pay a
     maximum amount of US$[**] per square foot of licensed space in each U.S.
     GDC space that StorageNetworks currently occupies or in which it
     establishes a new S-POP. The floor space shall paid at a graduated rate, as
     follows: (i) StorageNetworks shall pay US$[**] per square foot of licensed
     space upon the opening of any S-POP in a GDC and (ii) StorageNetworks shall
     increase its payments by US$[**] per square foot per Customer until three
     or more Customers are installed or using such S-POP, at which point the
     price for the floor space at such S-POP shall equal the full US$[**] per
     square foot. Notwithstanding anything to the contrary set forth herein,
     StorageNetworks shall pay the full US$[**] per square foot commencing on
     the first day of the fifth month following the establishment of any S-POP
     for that S-POP.

(b)  From May 1, 2001 through the remainder of the term of this Agreement,
     StorageNetworks will pay a maximum of US$[**] per square foot of licensed
     space in each U.S. GDC that StorageNetworks currently occupies space or in
     which it establishes an S-POP. The floor space shall paid at a graduated
     rate, as follows: (i) StorageNetworks shall pay US$[**] per square foot of
     licensed space upon the opening of any S-POP in a GDC and (ii)
     StorageNetworks shall increase its payments by US$[**] per square foot per
     Customer until three or more Customers are installed or using such S-POP,
     at which point the price for the floor space shall equal the full US$[**]
     per square foot. Notwithstanding anything to the contrary set forth herein,
     StorageNetworks shall pay the full US$[**] per square foot commencing on
     the first day of the third month following the establishment of any S-POP
     for that S-POP.

(c)  For all GlobalCenter wholly-owned GDC locations in Europe and Australia,
     StorageNetworks will pay a price per square foot of licensed space in each
     applicable GDC equal to [**] percent ([**]%) off of the list price of such
     space at the time that StorageNetworks establishes an S-POP in any such
     GDC.  In addition, such licensed space shall be paid for at graduated
     rates proportional to those set forth in paragraphs (a) and (b) above
     during the periods covered by each of those paragraphs.

(d)  For all GDC locations outside the U.S., Europe and Australia or GDC
     locations not wholly-owned by GlobalCenter, the Parties shall work together
     to jointly determine the appropriate price for such licensed space and such
     space shall be paid for at graduated rates proportional to those set forth
     in paragraphs (a) and (b) above or at such other rates as the Parties may
     mutually agree.

This information (data) contained in this Agreement constitutes a trade secret
      and/or information that is commercial or financial and confidential or
                                  privileged.
<PAGE>

EXHIBIT B  IMPLEMENTATION AND OPERATIONS PLAN
--------------------------------------------------------------------------------

  StorageNetworks agrees to install StorageNetworks equipment in GDCs as GDCs
  become available, if and only if sufficient pre-orders exist for data storage
  Services from such GDCs to justify such installation or if StorageNetworks
  determines that historical sales performance at existing S-POPS located in
  GDCs justify such installation; provided, however, that StorageNetworks shall
  not be entitled to decline installation in any GDC if it is installed, or has
  agreed to install, at any other hosting facility in the same metropolitan area
  as any GDC (in the event that StorageNetworks is compelled to install in any
  GDC pursuant to this clause, StorageNetworks shall use commercially reasonable
  efforts to install such S-POP as quickly as reasonably practicable).
  GlobalCenter and StorageNetworks will mutually decide initial S-POP size and
  future growth plan based on business need at each GDC.

B.1  IMPLEMENTATION PLANNING & COORDINATION

  The Program will be targeted initially at driving Customers to those GDCs
  where StorageNetworks is planning to have an S-POPsm data center.

  Specific tasks include, but are not limited to, the following:

  STORAGENETWORKS RESPONSIBILITIES

 .  Educate GlobalCenter operations & data center staff on StorageNetworks
facility and service provisioning requirements and procedures.

 .  Provide periodic facility forecasts to GlobalCenter.

 .  Perform a site survey of data center no later than 60 days before the S-POPsm
live date.

 .  Provide initial equipment layout diagrams no later than 45 days before the S-
POP live date.  Such proposed diagrams will not reflect the final equipment
layout, but will include all initial equipment requirements.

  GLOBALCENTER RESPONSIBILITIES

 .  GlobalCenter will provide StorageNetworks with at least 90 days prior written
notice of the opening of any new GDC.  StorageNetworks will have the right to
acquire space in such GDCs in accordance with the provisions of the Agreement.

 .  GlobalCenter will, if available, provide StorageNetworks with contiguous
space in each of the GDCs.  GlobalCenter will, if available and to the extent
reasonably practicable, provide the space directly adjacent to the transport
room and the main cabling tray/basket pathway at each facility.

 .  Not later than July 31, 2000, GlobalCenter will ensure that the data center
managers at each existing facility where StorageNetworks will be or is licensing
space have reviewed StorageNetworks' SPOP Co-Location Standard in Exhibit D and
that any technical or

This information (data) contained in this Agreement constitutes a trade secret
and/or information that is commercial or financial and confidential or
privileged.

<PAGE>

operational issues raised by such data center managers are clearly identified
and provided in writing to GlobalCenter's program manager and StorageNetworks
program manager.

 .  Not later than July 31, 2000, GlobalCenter will ensure that individual data
center managers and technical staff have been briefed on the Agreement and the
Services and that key installation and provisioning requirements for the
Services have been clearly defined (e.g., point-point fiber cable measurement,
installation, and provisioning; power; cable path diversity; and StoragePort
deployment).

  B.2  PROGRAM PERSONNEL

  StorageNetworks Responsibilities

 .  StorageNetworks shall provide a Global Services Program Manager to manage and
coordinate the implementation of StorageNetworks' infrastructure and storage
service delivery capability at GDCs.  The Global Services Program Manager will
be the primary point of contact at StorageNetworks for operational issues
including taking space, coordinating build-out, establishing the customer care
interface between GlobalCenter and StorageNetworks' Customer Support Center and
supporting the Service delivery to each customer and shall have an appropriate
level of authority to evaluate and resolve any deployment and service-affecting
issues within any GDC.

 .  In addition to the Program Manager, StorageNetworks shall provide an Alliance
Manager to: serve as marketing/sales/relationship liaison between the
StorageNetworks and GlobalCenter sales forces and management; develop
StorageNetworks sales programs to target both new prospects and existing
customer accounts; support the preparation of proposals for the Services; plan
and conduct Customer and executive visits; coordinate with the StorageNetworks
Global Services Program Manager.

 .  StorageNetworks shall provide GlobalCenter with regional, national and
international points of contact to administer effectively the GlobalCenter
operations relationship.

  GLOBALCENTER RESPONSIBILITIES

 .  GlobalCenter will designate a Program Manager as the primary point of contact
for StorageNetworks to address all operations and facility issues on a global
basis.  This person will have an appropriate level of authority to evaluate and
resolve any deployment and service-affecting issues within each individual data
centers.

 .  GlobalCenter will assign a person responsible for assisting StorageNetworks
in developing a joint operations training program and subsequent deployment of
the training program to GlobalCenter personnel.
<PAGE>

 .  Within thirty (30) days of a written request from StorageNetworks,
GlobalCenter will provide StorageNetworks with a list of all key regional,
national, and international contacts necessary to effectively administer the
StorageNetworks operational relationship. This list will include the data center
managers, technical contacts, program managers, and shipping and telco contacts.

B.3  FACILITY PROVISIONING

StorageNetworks and GlobalCenter will work together on developing and
provisioning S-POPs in each GDC.  This will involve defining floor space and
layout requirements, physical security, power, fiber cable management,
heating/cooling requirements, and ability to move large and heavy cabinets of
equipment within the data center from the loading dock to the StorageNetworks
cage.

Specific responsibilities include, but are not limited to, the following:

STORAGENETWORKS RESPONSIBILITIES

Provide customer fiber cabling assemblies to GlobalCenter at no charge to
GlobalCenter.

Provide S-POP fiber cable management system.

Provide power requirements to GlobalCenter

GLOBALCENTER RESPONSIBILITIES

All space in GDCs licensed to StorageNetworks shall meet the requirements set
forth in Exhibit D.

All reasonable StorageNetworks S-POP power requirements will be supplied and
installed by GlobalCenter.

All POTS and Frame relay cross-connects will be provided by GlobalCenter, to the
extent reasonably practicable, within three (3) working days of a written
request by StorageNetworks. The written request must occur after the lines have
been terminated in the GlobalCenter networking room.

GlobalCenter shall ensure that fiber cable tray and conduit facilities are
available from StorageNetworks' S-POP(s) to all cabinets / suites within the
facilities o Customers who have purchased the co-branded Services of the
Parties.
<PAGE>

  GlobalCenter shall provide adequate heating/cooling in accordance with the
  requirements set forth in Exhibit D.

  Provide sufficient rack space for routers and switches.

B.4  CUSTOMER SERVICE PROVISIONING

  StorageNetworks and GlobalCenter will coordinate Customer engagement,
  engineering review processes, service delivery and acceptance procedures,
  customer care processes, and change order procedures.

  The Parties will establish key tasks / intervals for the entire Customer
  provisioning process for the Services and will communicate those tasks /
  intervals to their internal organizations.  The objective is to ensure that
  Customers are provisioned in a consistent and timely manner.  The Parties
  agree that due to certain complex customer configurations, the standard
  provisioning intervals may not apply.  In those cases, the Parties will
  promptly communicate the actual intervals to the Customer.

  The Parties goal for provisioning the Services, from receipt of Customer order
  to service activation, will be to consistently achieve a maximum 15 calendar
  day interval.

  Specific tasks include, but are not limited to, the following:

STORAGENETWORKS RESPONSIBILITIES

  StorageNetworks shall have responsibility to perform the following activities
  in connection with this Section B.4, at its own and sole expense:

  Upon receipt of an order from GlobalCenter, StorageNetworks shall provide all
  hardware, software, network equipment and personnel required to adequately
  deliver the StorageNetworks' portion of the Services including, but not
  limited to:

       Ordering and delivery of all storage hardware and software

       Ordering and delivery of StoragePort Access Channel devices.

       Ordering and delivery of multimode fiber cable assemblies of the
       appropriate type and distance for connecting Customer servers (via
       StoragePort device) to StorageNetworks' SPOP(s).

       Ordering and delivery of server attach kits to allow connection of the
       Customer's servers, via the StoragePort, to StorageNetworks' SPOP.

       Issuing to GlobalCenter Service Orders required to deliver the Services.
<PAGE>

       Configuration, test, and activation of the Services.

       Providing fiber cable installation and test guidelines to GlobalCenter.

       Deliver a copy of the customer contract to GlobalCenter to start customer
       provisioning.

  StorageNetworks reserves the right to make all storage service infrastructure
  decisions including choice of vendor.

  StorageNetworks will deploy the requisite personnel and network resources to
  turn up/ increase capacity for Customers.

GLOBALCENTER RESPONSIBILITIES

  GlobalCenter shall have responsibility to perform the following activities in
  connection with this Section B.4, at its own and sole expense:

       GlobalCenter will be responsible for measuring the required length of
       fiber and installation and test of point-point fiber cables directly from
       the StorageNetworks S-POP(s) to the StoragePort located in the Customer's
       cage/cabinets in accordance with the interval established in this Section
       B.4.

       GlobalCenter will be responsible for ensuring that the provisioning tasks
       associated with the facility services are integrated in the GlobalCenter
       Order Entry system (e.g. 208V, 50Amp and 30Amp 3-phase power cables,
       point-point fiber installation, providing measurements of the fiber cable
       run.)

       GlobalCenter will work with StorageNetworks to provide guaranteed turn-
       around times on installation and provisioning requests such as cage
       builds, power, fiber cable installation and cross-connects, and telco
       installation.

B.5  CUSTOMER CARE

  The Parties will continue to develop a joint Customer Care plan.  The plan
  will identify specific procedures and processes for handling trouble tickets,
  change orders, and escalation procedures between the Parties' respective
  customer care organizations.  Additionally, the Parties will evaluate the
  feasibility of electronic integration of the Parties customer care systems to
  ensure the highest levels of customer satisfaction.

  The Parties agree to meet at least once every quarter to review procedures,
  performance measurements, and update processes.
<PAGE>

  Specific responsibilities include, but are not limited to, the following:

  STORAGENETWORKS RESPONSIBILITIES

  StorageNetworks Customer Support Center (CSC) will work with GlobalCenter to
  create a list of questions that are frequently asked by the Customer, along
  with information needed to answer the questions.  StorageNetworks and
  GlobalCenter will define the circumstances which will result in the call being
  escalated to StorageNetworks via the toll free CSC telephone number,
  877-769-0009.

  StorageNetworks and GlobalCenter will develop a procedure to provide an
  electronic copy of incident tracking information, including the incident
  tracking number.

  GLOBALCENTER RESPONSIBILITIES

  GlobalCenter will provide StorageNetworks CSC with an incident tracking number
  for cross reference purposes and electronic copies of any information
  pertaining to the reason for the call.  Electronic copies will be emailed to
  customer.support@storagenetworks.com.unless an alternative electronic format
  has previously been implemented.  The GlobalCenter incident tracking number
  needs to be included in the message's subject line.

B.6  TRAINING

  StorageNetworks and GlobalCenter will provide training on the Services to
  GlobalCenter personnel not later than July 31, 2000.  Representatives from
  GlobalCenter and StorageNetworks will meet to develop a Joint Training Plan
  ("JTP") not later than June 30, 2000.  The JTP document will be the result of
  the combined planning efforts of the Parties representatives and will identify
  the specific activities and timelines for training.

  The Parties will prioritize the training in the GDCs where the Services will
  be available first.

  The Parties agree that each Party shall be responsible for its own internal
  time and expenses utilized in developing the JTP and the resulting training
  programs and materials that result from the JTP.

  Specific responsibilities include, but are not limited to, the following:

  STORAGENETWORKS RESPONSIBILITIES

  StorageNetworks shall have responsibility to perform the following activities
  in connection with this Section B.6, at its own and sole expense:
<PAGE>

  StorageNetworks is responsible to educate appropriate GlobalCenter Operations,
  Sales, Professional Services and Product Management staff on the
  StorageNetworks portion of the Services prior to (or simultaneously with) the
  release of said Services.

  StorageNetworks is responsible to ensure that StorageNetworks support
  personnel are adequately trained to provide support to GlobalCenter's
  Customers with respect to the StorageNetworks portion of the Services.

  GLOBALCENTER RESPONSIBILITIES
  -----------------------------

  GlobalCenter shall have responsibility to perform the following activities in
  connection with this Section B.6, at its own and sole expense:

  GlobalCenter is responsible to educate appropriate StorageNetworks Operations,
  Sales, Professional Services and Product Management staff on the GlobalCenter
  portion of the Services prior to (or simultaneously with) the release of said
  Services.

  GlobalCenter is responsible to ensure that GlobalCenter support personnel are
  adequately trained as required to provide Tier 1 support to Customers with
  respect to the GlobalCenter portion of the Services.

  GlobalCenter will provide appropriate facilities for training and will make
  commercially reasonable efforts to bring people together on a regional basis
  for training so that the number of training sessions provided by
  StorageNetworks is minimized.

B.7  CHANGE MANAGEMENT

  StorageNetworks and GlobalCenter will meet not later than June 30, 2000 to
  develop procedures for change management.  These procedures will be clearly
  documented and available for dissemination within the Parties internal
  operations and support organizations not later than July 31, 2000.

  STORAGENETWORKS RESPONSIBILITIES

  GlobalCenter will be provided with at least twenty-one (21) days prior written
  notice of any scheduled changes made by StorageNetworks that affect the
  Services.  However, if shorter notification period is required, changes will
  be made with the agreement of GlobalCenter.

  If a scheduled outage is required, StorageNetworks will work with GlobalCenter
  to ensure that the services are not affected beyond the levels set forth in
  the Master Service Level Agreement.  StorageNetworks reserves the right to
  proceed with any change if it is determined by StorageNetworks that the change
  will not cause harm to the customer's specific environment.
<PAGE>

  StorageNetworks is responsible to provide the GlobalCenter with a 7x24x365
  Customer Service Center that can process change requests for customers.  All
  change requests will follow normal StorageNetworks Change Management
  procedures.

B.8  MONITORING, EVENT NOTIFICATION & ESCALATION

  StorageNetworks and GlobalCenter agree to meet not later than June 30, 2000
  to:

  Develop processes and procedures to integrate their respective network /site
  monitoring systems.

  Develop processes and procedure for responding to and addressing outages.

  Develop escalation procedures.

  These processes and procedures will be clearly documented and available for
  dissemination within the Parties internal operations and support organizations
  not later than July 31, 2000.  The objective of this effort is to provide a
  consistent, timely and quality mechanism for dealing with service-affecting
  problems.

B.9  SITE SECURITY

  The Parties agree that in each data center, access is granted on an as-needed
  basis.  Facilities must be in place to validate a person's identity and allow
  appropriate access.

  STORAGENETWORKS RESPONSIBILITIES

  StorageNetworks will comply with GlobalCenter site security and access control
  policies.

  StorageNetworks will be responsible for all work performed by StorageNetworks
  personnel and contractors while on GlobalCenter premises.

  StorageNetworks will be responsible for developing and maintaining an
  authorized site access list which is provided to GlobalCenter periodically as
  required and in accordance with GlobalCenter site access / security policies.

  GLOBALCENTER RESPONSIBILITIES

  GlobalCenter is responsible for complying with the security provisions in the
  Master Service Level Agreements between GlobalCenter and StorageNetworks.

  GlobalCenter shall ensure site security and data center access policies and
  procedures are clearly documented and provided to StorageNetworks not later
  than June 30, 2000.
<PAGE>

  GlobalCenter will update its site access lists no later than 24 hours after
  confirmed receipt of any written / email request from StorageNetworks
  authorized representative(s).

  Unless there is an emergency situation in the facility, GlobalCenter is
  responsible for contacting StorageNetworks before gaining access to
  StorageNetworks private cage/suite.  At all times, other than in the case of
  an emergency situation, GlobalCenter and/or its authorized representatives
  must be escorted by a StorageNetworks employee.

  Personal Identification Access Units, such as key cards and biometric readers
  or onsite security processes requiring identity validation for entry, will be
  required for direct access to the data center.

B.10  INTER-SITE CONNECTIVITY

  StorageNetworks Responsibilities

  In instances where fiber connectivity is utilized to link one or more GDCs or
  a GDC to a Customer's facility, StorageNetworks will be responsible for
  procurement and deployment of such fiber connectivity.

  GLOBALCENTER RESPONSIBILITIES

  GlobalCenter will provide appropriate methods to route fiber cable between
  two adjoining GDCs.  The appropriate method for running the fiber will be
  jointly determined.  Any facilities costs will be the responsibility of
  GlobalCenter.

B.11  STORAGEPORT

  GlobalCenter and StorageNetworks jointly will implement the StorageNetworks
  StoragePORTtm access channel in each GlobalCenter data center that houses a
  StorageNetworks S-POP.  The Parties shall use commercially reasonable efforts
  to integrate an option for GlobalCenter customers to install StoragePorts into
  the sales process, including GlobalCenter Client Services Representatives
  informing GlobalCenter customers of the option to have a StoragePort installed
  in one of their cages at the time of such GlobalCenter customer's
  installation. In addition, in the event GlobalCenter creates a checklist that
  will provide GlobalCenter customers with several different options in relation
  to services provided by GlobalCenter, GlobalCenter shall include in such
  checklist an option for a GlobalCenter customer to have a StoragePort
  installed in one of the GlobalCenter customer's cages in a GDC.

  Each StoragePORTtm, both rack mounted and wall mounted, will, if possible, be
  prominently displayed.  StorageNetworks will bear the cost of the
  StoragePORTtm device and the installation in connection therewith, and all
  StoragePort equipment will be co-branded with GlobalCenter's Disk-on-
  Demand(sm) service messaging.
<PAGE>

B.12  SUMMARY OF KEY DATES

<TABLE>
<CAPTION>
Section                          DESCRIPTION                                  Date
------------------------------------------------------------------------------------------
<S>      <C>                                                           <C>
B.1      Written notice of the opening of any new data center          90 days prior
         facility
------------------------------------------------------------------------------------------
B.1      GlobalCenter data center managers have reviewed               July 31, 2000
         StorageNetworks SPOP Co-Location Standard.
------------------------------------------------------------------------------------------
B.1      GlobalCenter data center managers and technical staff have    July 31, 2000
         been briefed on the Agreement and Storage Services.
------------------------------------------------------------------------------------------
B.2      Executive Representatives meetings                            Minimum 2 per year
------------------------------------------------------------------------------------------
B.2      GlobalCenter will provide StorageNetworks with key            30 days after
         regional, national, and international contacts.               written request
                                                                       from
                                                                       StorageNetworks
------------------------------------------------------------------------------------------
B.3      POTS and Frame relay cross-connects provided to               3 days, to the
         StorageNetworks by GlobalCenter after lines terminated in     extent reasonably
         networking room                                               practicable
------------------------------------------------------------------------------------------
B.4      Customer order to service activation timeline goal            15 days maximum
------------------------------------------------------------------------------------------
B.5      Meeting to discuss and develop a joint Customer Care plan     June 30, 2000
------------------------------------------------------------------------------------------
B.5      Meeting to review customer care procedures, performance       Quarterly
         measurements, and update processes.
------------------------------------------------------------------------------------------
B.6      Meeting for development of a Joint Training Plan              June 30, 2000
------------------------------------------------------------------------------------------
</TABLE>
<PAGE>

<TABLE>

<S>     <C>                                                          <C>

------------------------------------------------------------------------------------------
B.6      Training to GlobalCenter personnel completed                  July 31, 2000
------------------------------------------------------------------------------------------
B.9      Meeting to develop a plan & procedures for Change Management  June 30, 2000
------------------------------------------------------------------------------------------
B.9      Plan documented and disseminated to internal support          July 31, 2000
         organizations
------------------------------------------------------------------------------------------
B.9      GlobalCenter provided with written notice of any scheduled    21 days prior
         changes that affect the Storage Services
------------------------------------------------------------------------------------------
B.10     Meeting to develop processes / procedures for monitoring      June 30, 2000
         systems, response to outages, and escalation procedures
------------------------------------------------------------------------------------------
B.10     Documentation and dissemination of Monitoring, Event          July 31, 2000
         Notification, and escalation processes and procedures.
------------------------------------------------------------------------------------------
B.11     Site Security and data center access policies and             June 30, 2000
         procedures documented and provided to StorageNetworks
------------------------------------------------------------------------------------------
B.11     Site access lists updated                                     Within 24 hours of
                                                                       confirmed receipt
------------------------------------------------------------------------------------------
</TABLE>
<PAGE>

EXHIBIT C                 SERVICE ORDER
--------------------------------------------------------------------------------
[SERVICE ORDER TO BE ATTACHED]
<PAGE>

         Confidential Materials omitted and filed separately with the
        Securities and Exchange Commission. Asterisks denote omissions.

                                                                       EXHIBIT C

                                    Web Hosting Service Order
GLOBALCENTER                        ------------------------------------
A GLOBAL CROSSING COMPANY           Service Order Term:  1 year subject
                                                         to the term of
                                                         the JMSA
                                    Use with MSA #       5.01.00
                                    Service Order Date:  5/31/00
                                    Estimated Install Date: N/A

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

<TABLE>
<CAPTION>

CUSTOMER DATA                                                     GLOBALCENTER SALES DATA
----------------------------------------------------------------------------------------------------------------------------------
<S>                                                            <C>
Company: StorageNetworks                                          Salesperson: Adam Fore
----------------------------------------------------------------------------------------------------------------------------------
Primary Contact: David Boskee
----------------------------------------------------------------------------------------------------------------------------------

Billing Address: 100 Fifth Avenue, 6th Floor                      Address: 141 Caspian Court
                 Waltham, MA 02451                                         Sunnyvale, CA 94089

Phone: (781) 434-6735                                             Phone: (408) 543-9015
Fax: (781) 434-6799                                               Fax: (408) 734-0624
Email: dave.boskee@storagenetworks.com                            Email: afore@globalcenter.net
----------------------------------------------------------------------------------------------------------------------------------

Technical or Secondary Contact: John Clavin                       Secondary Contact: Greg Liberman
Phone: (781) 434-6700                                             Phone: (408) 543-4766
Email: john.clavin@storagenetworks.com                            Email: gliberman@globalcenter.net
----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

COMPLEX WEB HOSTING - ONE TIME INSTALLATION FEES:
<TABLE>
<CAPTION>
                                                                                                  UNIT         EXTENDED
 ITM #                                DESCRIPTION                                QTY      UM      PRICE         PRICE
---------------------------------------------------------------------------------------------------------------------------
<C>      <S>                                                                    <C>     <C>     <C>        <C>
   2     ADDITIONAL POWER CIRCUIT:  SEE JMSA                                                        $[**]              [**]
                                                                                                 Includes
                                                                                                    labor
---------------------------------------------------------------------------------------------------------------------------
   3     CO-LOCATION INSTALLATION: Setup of racks or cages in the data center                                          [**]
         facilities.

---------------------------------------------------------------------------------------------------------------------------
   4     INSTALLATION AND COORDINATION FEES                                          2   HRS     By Quote              [**]
---------------------------------------------------------------------------------------------------------------------------
WEB HOSTING - ONE TIME FEES TOTAL                                                                                    $ [**]
---------------------------------------------------------------------------------------------------------------------------
</TABLE>

The information (data) contained in this Service Order is confidential and
proprietary information, and contains trade secrets and other privileged
information. It is furnished to the Buyer in confidence and upon the condition
that it be used only for internal evaluation purposes, and not divulged or
disclosed to third parties without the written consent of GlobalCenter. GC
Complex Web Hosting SO/Quote Ver. 5 Rev. 4 March 2000

<PAGE>

         Confidential Materials omitted and filed separately with the
        Securities and Exchange Commission. Asterisks denote omissions.

                                    Web Hosting Service Order
GLOBALCENTER                        ------------------------------------
A GLOBAL CROSSING COMPANY           Service Order Term:  1 year subject
                                                         to the term of
                                                         the JMSA
                                    Use with MSA #       5.01.00
                                    Service Order Date:  5/31/00
                                    Estimated Install Date: N/A

COMPLEX WEB HOSTING - MONTHLY RECURRING FEES:
<TABLE>
<CAPTION>
 ITM #                                DESCRIPTION                                 QTY       UM      UNIT     EXTENDED PRICE
                                                                                                   PRICE
----------------------------------------------------------------------------------------------------------------------------
<S>      <C>                                                                    <C>       <C>     <C>       <C>
   1     ADDITIONAL POWER CIRCUITS:  As per SPOP specification                         1      EA      $[**]             [**]
----------------------------------------------------------------------------------------------------------------------------
   2     CO-LOCATION SERVICES: Monthly rental of secure space in a data
         center facility.

         Toyama Data Center (S-POP opened 12/99)                                      50  Sq. ft      $[**]         $[**]
         Borregas Data Center (S-POP opened 1/00)                                  1,200  Sq. ft      $[**]         $[**]
         Anaheim Data Center (S-POP opened 3/00)                                     300  Sq. ft      $[**]         $[**]
         Herndon Data Center (S-POP opened 12/99)                                    600  Sq. ft      $[**]         $[**]
         New York Data Center (S-POP opened 2/00)                                    600  Sq. ft      $[**]         $[**]
         *The amounts payable for the space licensed pursuant to this Service
         Order shall be payable in accordance with Exhibit A of the JMSA.
----------------------------------------------------------------------------------------------------------------------------
   3     TECHNICAL ACCOUNT MANAGER (TAM) CONSULTING TIME:                                   HR                          [**]
         Committed Time for 0 - 9 Hours      $[**]/hr
         Committed Time for 10 - 40 Hours    $[**]/hr
         Committed Time for Over 40 Hours    $[**]/hr
         Non-contracted Time - $[**]/hr
         Non-contracted time is utilized in 1-hour time blocks.
         Emergency Rate  - $[**]/hour over the current rate.  Billed in 2-hour
         blocks.
         Emergency time (6pm-8am local time, Monday through Friday, weekends
         and holidays).
----------------------------------------------------------------------------------------------------------------------------
WEB HOSTING - MONTHLY RECURRING FEES TOTAL                                                                             $[**]
----------------------------------------------------------------------------------------------------------------------------
</TABLE>

The information (data) contained in this Service Order is confidential and
proprietary information, and contains trade secrets and other privileged
information. It is furnished to the Buyer in confidence and upon the condition
that it be used only for internal evaluation purposes, and not divulged or
disclosed to third parties without the written consent of GlobalCenter. GC
Complex Web Hosting SO/Quote Ver. 5 Rev. 4 March 2000
<PAGE>

         Confidential Materials omitted and filed separately with the
        Securities and Exchange Commission. Asterisks denote omissions.

[GLOBALCENTER LOGO APPEARS HERE]       Web Hosting Service Order
GLOBALCENTER                           ----------------------------------------
A GLOBAL CROSSING COMPANY              Service Order Term:      1 year subject
                                                                to the term of
                                                                the JMSA
                                       Use with MSA #           5.01.00
                                       Service Order Date:      5/31/00
                                       Estimated Install Date:  N/A

--------------------------------------------------------------------------------
TERMS and CONDITIONS:

1.  Monthly recurring charges for space commence upon the date of receipt of
equipment by GlobalCenter into the space, or 30 days from the execution of this
Service Order, whichever occurs first.

2.  Cartage fees and off-hours elevator service fees charged by building
management at 111 8th Avenue, NYC for client moves, trash and packing material
disposal will be forwarded to the client for payment, and are the obligation of
the client, not GlobalCenter.

3.  This Service Order is subject to both the terms and conditions set forth in
that certain Amended and Restated Joint Marketing and Services Agreement between
the Parties, dated as of the date hereof ("JMSA") and the terms and conditions
of the MSA (as defined below).

4.  Notwithstanding anything to the contrary set forth herein, during the term
of the JMSA, GlobalCenter agrees not to terminate this Service Order in
accordance with Section 10.1 of the MSA.

--------------------------------------------------------------------------------
95TH PERCENTILE RULE

Clients are billed monthly for the committed bandwidth. GlobalCenter monitors
SNMP bandwidth and takes a data point reflecting bandwidth utilization at that
particular instance on the client's Internet connection(s) every 5 minutes, then
averages every 30 minutes for a billing period of one month. At the end of the
month, all the data samples are collected then sorted from highest to lowest and
the top 5% are discarded. The next highest data sample will then be referred to
as the "95th Percentile" number. This number will then be used as the basis in
computing the additional (burst) bandwidth amount for that particular month over
the committed bandwidth already purchased.

All Service Orders are subject to the GlobalCenter Master Service Agreement
entered into between the Parties as of the date hereof (the "MSA").  This
Service Order serves as a Purchase Order when signed by authorized
representatives of client and GlobalCenter.  Please send or FAX signed Service
Order to the above GlobalCenter address. This service order pricing is valid and
may be accepted for 30 days.

<TABLE>
<CAPTION>
FOR CLIENT:                                                       FOR GLOBALCENTER:
<S>                                                               <C>
Accepted by:                                                      Accepted by:

-----------------------------------------------------             -----------------------------------------------------------
Printed Name:                                                     Printed Name:

-----------------------------------------------------             -----------------------------------------------------------
Title:                                                            Title:

-----------------------------------------------------             -----------------------------------------------------------
Date:                                                             Date:

-----------------------------------------------------             -----------------------------------------------------------
PO#
--------------------------------------------------------
</TABLE>

The information (data) contained in this Service Order is confidential and
proprietary information, and contains trade secrets and other privileged
information. It is furnished to the Buyer in confidence and upon the condition
that it be used only for internal evaluation purposes, and not divulged or
disclosed to third parties without the written consent of GlobalCenter. GC
Complex Web Hosting SO/Quote Ver. 5 Rev. 4 March 2000
<PAGE>

Exhibit D    STORAGENETWORKS FACILITIES REQUIREMENTS
--------------------------------------------------------------------------------

  INTRODUCTION

StorageNetworks, Inc. is building a worldwide network to support the data
storage needs of the e-Economy.  Data storage equipment will be installed within
new and existing co-location facilities as well as customer data centers.  The
data storage location is referred to as an S-POP.

This document contains the physical site planning requirements and guidelines
for the installation of data storage and associated electronic communications
equipment and materials that will be installed, operated and maintained by
StorageNetworks, Inc. personnel.  It is intended solely to provide guidance for
the co-location facility manager, the S-POP design engineers and construction
contractors and the S-POP communications cabling planners.  Supplementary
specifications, equipment layouts, floor plans and requirements for special
conditions will be provided for each specific site.

Requests for technical information regarding the co-location provider's facility
systems are included in this document.  This information is necessary to aid
StorageNetworks, Inc. personnel in understanding the design, operation and
reliability of the mechanical and electrical support systems, the fire
protection systems and the physical security of this facility.

ALL PHYSICAL SITE REQUIREMENTS ARE SUBJECT TO THE LOCAL BUILDING AND FIRE CODES
OF ANY APPLICABLE GDC.  GLOBALCENTER WILL USE COMMERCIALLY REASONABLE EFFORTS TO
ACHIEVE THESE GUIDELINES.  STORAGENETWORKS WILL BE NOTIFIED WHEN GLOBALCENTER
CANNOT MEET THESE SPECIFICATIONS AND BOTH COMPANIES WILL WORK TOGETHER TO COME
TO A MUTUALLY AGREEABLE SOLUTION.

     Physical Site Requirements

1.1.  Walls/partitioning system:  Wire cage partitions, metal studs and drywall,
modular panel systems or other similar systems are acceptable methods for
securing the S-POP space.  Visual access from main aisle-ways is preferred.
Walls/partitioning must extend from structural ceiling to raised floor or at a
minimum 96in/243.84cm above the finished raised floor.

1.2. Doors:  Sliding or swinging doors with clear dimensions sufficient to
accommodate entry of storage equipment measuring 75in/190.3cm high x
69in/174.5cm wide x 36.5in/92.5cm deep and equipment cabinets measuring
84.5in/214.63cm high x 24in/60.96cm wide x 36in/91.44cm deep.  Where possible,
removable headers and transoms above the doors are preferred.  Doors must be
lockable.

1.3. Raised floor system:  Standard data center type, 24in/60.96cm x
24in/60.96cm panels are required.
<PAGE>

 .    height:  minimum raised floor height of 12in/30.48cm
     ------

 .    minimum floor load requirements:
     -------------------------------

     o  Floor load bearing: 300psf

 .    grid type:  Rigid grid with bolted stringers is required.   Note that some
     ---------
     equipment may require additional stanchions located approximately at the
     center of uncut corner floor tiles for extra support.

 .    floor panel cutouts:  Floor panel cutouts to accommodate the bus and tag
     -------------------
     cables are required. All cutouts will be trimmed off. Dimensions and
     locations of cut outs will be shown on final drawings for each specific
     site.

 .    Earthquake bracing is required in earthquake prone regions.

1.4. Clearances: CLEAR HEIGHT MINIMUM OF 93IN/236.22CM ABOVE THE
RAISED FLOOR WITHIN THE S-POP IS REQUIRED.

1.5. Accessibility:  Access from the loading dock, elevators and common area
corridors leading to the S-POP space must be adequate to accommodate delivery of
storage equipment 75in/190.3cm high x 69in/174.5cm wide x 36.5in/92.5cm deep,
weighing 3,127lbs/1,421kg and equipment cabinets measuring 84.5in/214.63cm high
x 24in/60.96cm wide x 36in/91.44cm deep and weighing 1,300lbs/589.7kg.

1.6. Signage locations:  A vinyl banner measuring 36in/91.44cm x 96in/243.84cm
and a sign measuring 24in/60.96cm x 36in/91.44cm may be attached to the
wall/partitioning.  StorageNetworks, Inc will provide the banner and sign.

1.7. Obstructions:  Pipes, ducts, conduits, light fixtures, etc.  within the S-
POP space MUST BE AT LEAST 108IN/274.32CM ABOVE FINISHED FLOOR HEIGHT.  There
should be no obstructions in the immediate vicinity of the S-POP entry way(s)
that would interfere with the delivery of new equipment.

2.   ELECTRICAL POWER SERVICES

2.1. Primary Service:

     Utility Provider:          Identify utility company(s)

     Number of lines:           Identify line number(s)

     Underground or overhead:   Identify type

     Redundant transformer:     Identify ratings and location

     Power Factor:              Determine power factor
<PAGE>

     Harmonic Distortion:     Determine total harmonic distortion

2.2. General area lighting: Adequate emergency lighting must be provided in
accordance with the governing building codes to permit personnel to service the
equipment in the event of a power failure.

2.3. Emergency egress lighting: Determine locations of nearest fixtures.

2.4. Critical equipment power: The design of the mission critical electrical
distribution system must contain the capacity and capability to provide Fault
Tolerant functionality.  This will enable the infrastructure to withstand one
unplanned system failure with no impact on the critical loads.

     Based on manufacturer's nameplate data, the maximum power density for a
fully configured S-POP is approximately 162 watts/sf. Note that most of the data
storage devices to be installed require two dedicated or isolated AC power lines
located within 6 feet of a specified location depending upon the actual model
number of the device. The power line sources must reside on separate circuit
panels or power distribution units and separate UPS systems.

2.5. UPS/batteries: Identify number of modules, capacity, load utilization,
battery life and configuration (n+1, 2n, 2n+1, etc.).   Identify all single
points-of-failure.

2.6. Identify if shared with others or if dedicated to StorageNetworks' S-POP.

2.7. Auxiliary generators: Identify number of generators, capacity, load
utilization, configuration (n+1, n+2, 2n, etc.) and fuel storage capacity.

2.8. Power distribution units: Identify number of PDU's that will serve the S-
POP, the capacity of each, load balance values, and load utilization.  Identify
if shared with others or if dedicated to the S-POP.

2.9. Grounding: Grounding requirements are referenced in the equipment
specifications.  All work must be in accordance with the governing local codes
and standards.

2.10.  Circuit Identification: Label all receptacles and connectors with the
specific equipment identifier, UPS #, PDU #, panel-board and circuit number
designations.

2.11.  Convenience power:  Provide (2) convenience receptacles for non-
equipment purposes.  Label the receptacles as "NON-UPS".

2.12.  Remote Power Monitoring:  Remote power monitoring may be required at
locations where onsite 24x7 monitoring by the co-location provider is not
available.
<PAGE>

3.   MECHANICAL SERVICES

Environmental equipment:  The design of the mission-critical cooling system must
contain the capacity and capability to provide Fault Tolerant functionality.
This will enable the infrastructure to withstand one unplanned system failure
with no impact on the critical loads.

       Cooling units:  Identify number of A/C units serving the S-POP, capacity,
       utilization and configuration (n+1, n+2, etc.).   Based on manufacturer's
       nameplate data, the approximate heat dissipation of a fully configured S-
       POP is approximately 510 btu/hr/sf.

3.1. Remote Power Monitoring:  Remote power monitoring may be required at
locations where onsite 24x7 monitoring by the co-location provider is not
available.

3.2. Fire Protection equipment:

               smoke/fire detection systems:  Identify type of fire and smoke
                                              detectors

               smoke/fire alarm system:       Identify location of nearest a/v
                                              device

               pre-action sprinkler:          Identify type of sprinkler system

               gas suppression:               Identify type of gas suppression
                                              system

               portable fire extinguishers:   Identify location of nearest
                                              portable extinguisher

               remote fire alarm monitoring:  Identify location of remote
                                              monitoring

4.   SECURITY

  StorageNetworks, Inc. treats customer data with the highest levels of security
     and as such our facilities must be secure and safe.  In each facility
     access is granted on an as needed basis.  Procedures must be in place to
     validate a person's identity and allow appropriate access of
     StorageNetworks' personnel by an authorized StorageNetworks'
     representative.  Key-cards, palm-readers or an on-site security access
     process requiring identity validation for entry will be required for access
     to the technical operations spaces.

4.1. Access control equipment: Identify type of access control systems in use at
the facility entrance and at the S-POP cage doors.

4.2. Key locks: Identify type, key number and control procedure.

4.3. Video monitoring: Identify nearest location to S-POP and coverage.

4.4. Motion detection: Identify nearest detector to S-POP.

4.5. Remote monitoring:  Identify location of 24x7 remote monitoring systems.
<PAGE>

Exhibit F - GlobalCenter Master Service Agreement
--------------------------------------------------------------------------------

     [MSA to be attached]
<PAGE>

EXHIBIT G MUTUAL INDUCEMENTS

  In order to ensure the successful execution and continuity of the
  GlobalCenter-StorageNetworks alliance for delivery of Storage Services, the
  following marketing activities shall be pursued:

  SALES FORCE TRAINING: All relevant sales force personnel at GlobalCenter and
  StorageNetworks shall receive training on the presentation and value of the
  Storage Services to be delivered at GDCs.

  MARKETING MEDIA: Both Parties shall actively commit their respective marketing
  departments to stimulate and maintain market awareness of the Storage Services
  to be delivered at the GDCs. Primary marketing media to be included in this
  inducement include, but are not limited to, internet, print, person-to-person,
  and public exhibits. See Exhibit I for details on marketing activities.
<PAGE>

EXHIBIT H PROJECT TEAM ROSTER

GLOBALCENTER PROJECT TEAM

PRODUCT MANAGEMENT
------------------

          Adam Fore, Product Manager - Storage Network Architecture

PROJECT MANAGEMENT
------------------

          Rick Sparks, Senior Program Manager

INSTALLATION/ PROVISIONING
--------------------------

          Debra Nathan, Install Coordinator

FACILITIES
-----------

          Gene Merkel - National Director of Operations

          Mike Marino -  Facilities coordinator - NY

          Dennis Coleman - Facilities coordinator - Herndon, VA

          Mark Noble - Facilities Coordinator - Sunnyvale

  OPERATIONS:
  -----------

          Mary Sue Bizzari, Senior Director

  MARKETING/ PR:
  --------------

          Joan McIsaac, Manager Alliance Marketing

          Ron Mason, Manager Product Marketing

          Sherbeam Lewis, PR Specialist

  PROF. SERVICES:
  ---------------

          Chris Coluzzi, Manager TAM

  SALES:
  ------

          Tom Alvary, Director of Sales

  SALES OPERATIONS:
  -----------------

          Carolyn McBride, Manager Sales Operations

<PAGE>

  TECHNICAL ADVISOR:
  ------------------

          Scott Santana, Manager R&D

  LEGAL:
  ------

          Greg Liberman, Vice President & Associate General Counsel

  FINANCE:
  --------

          Derek Chang, Executive Vice President & Chief Financial Officer

                                       38
<PAGE>

  STORAGENETWORKS PROJECT TEAM

  BUSINESS PLAN AND PROJECT OVERSIGHT:
  ------------------------------------

          Jack Salerno, Director of Alliances

  OPERATIONS:
  -----------

          Dave Boskee, Program Manager

  Marketing:
  ----------

          Graeme Jarvis, Director of Partner Marketing

  MARCOMM:
  --------

          Nicole Gorman, Director of Marketing Communications

  PROF. SERVICES:
  ---------------

          Russell Rusch, Director of Professional Services

  SALES:
  ------

          John Lloyd, Western Region Director of Sales Operations

  TRAINING:
  ---------

          Rick Cameron, Director of Corporate Education

  LEGAL:
  -----

          Dean Breda, General Counsel

  FINANCE:
  -------

          Paul Flanagan, Chief Financial Officer
<PAGE>

EXHIBIT J - RULES OF SALES ENGAGEMENT

1. LINES OF COMMUNICATION

StorageNetworks and GlobalCenter regional sales directors will coordinate
efforts within their regions and act as the point of contact for their
respective field sales forces. Each regional sales director will provide
complete lists of area account executives and plans for ensuring initial account
meetings and interaction.

2. TEAMING

The appropriate level of account teaming will be defined by the existing
relationship with the Customer. StorageNetworks and GlobalCenter agree that one
of the below scenarios will be utilized for engaging Customers:

1.   StorageNetworks possesses the initial relationship with prospective or
present Customer and will introduce said Customer to a GlobalCenter sales
representative to assist in selling the Services and/or other services provided
by the Parties or GlobalCenter.

2.  GlobalCenter possesses the initial relationship with prospective or present
Customer will introduce said Customers to a StorageNetworks sales representative
to assist in selling the Services and/or other services provided by the Parties
or StorageNetworks.

3.  Both GlobalCenter sales and StorageNetworks sales jointly approach the
initial Customer to present the Services and/or other services provided by the
Parties.

3. SALES TRAINING

  3.1 Regional sales training. Each Party will deliver presentations and engage
  in appropriate training to support the roll-out of the Services and gain
  familiarity with the other Party's business operations.

  3.2 Ongoing training. Periodically, the Parties agree to engage in joint
  training of their sales forces as it pertains to delivery and presentation of
  the Services.

4. CONFLICT RESOLUTION.

In the event of a dispute regarding any sales account issues, both Parties agree
to attempt to resolve the conflict first at a local level. In the event of an
impasse, the issue will be addressed at a regional level or escalated to their
appropriate sales or corporate leadership, as merited.<PAGE>

    Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

                                                                   Exhibit 10.13
                                                                   -------------

                   Fiber Optic Network Leased Fiber Agreement
                                 Product Order

This Product Order ("Product Order") together with the General Terms and
Conditions constitute the Fiber Optic Private Network Agreement ("Agreement")
which is effective as of October 8, 1999 by and between Metromedia Fiber Network
Services, Inc. ("MFN"), One North Lexington Ave., Fourth Floor, White Plains,
New York 10601, and StorageNetworks, Inc. ("Carrier"), 100 Fifth Avenue,
Waltham, Massachusetts 02451.  Definitions of terms used in this Agreement
appear in this Product Order and in the General Terms and Conditions.

Carrier hereby orders and MFN hereby agrees to provide Leased Fiber as follows:

     1.   Lease Term: 240 Months

     2.   Number of Leased Fibers: To Be Determined in each Supplement

     3.   Number of Leased Fiber Miles: An aggregate of [**] to be leased
          pursuant to supplements ("Supplements" and each a "Supplement") to
          this Product Order to be executed between the parties. The form of
          Supplement is attached hereto as Annex I. In no event shall MFN add to
          any Supplement any materially terms or conditions different from or in
          addition to the terms and conditions of this Agreement without the
          prior consent of Carrier.

     4.   Carrier locations ("Location(s)"): To be specified in Supplements to
          this Product Order.

     5.   Specifications pertinent to the Leased Fiber: To be provided as an
          Exhibit to the Supplement. Minimum Specifications of the Leased Fiber
          are set forth in Annex II hereto.

     6.   Installation Charge and Monthly Lease Payments:

          6.1  One Time Installation Charge: If any, to be specified in each
               Supplement. Any lateral connections from the MFN Network to such
               Locations are not included in the Monthly Lease Payment. Such
               lateral connections may be built by MFN at Carrier's request and
               at Carrier's cost, to be negotiated in good faith by the parties
               and included in any Supplement. The One Time Installation Charge
               for a Location shall in no event exceed MFN's actual cost plus
               [**] percent ([**]) plus Applicable Taxes, whether such cost is
               incurred before or after the date of the applicable Supplement.

          6.2  Monthly Lease Payments: $[**] per Leased Fiber Mile, subject to
               tolling and discounting as hereinafter provided.

          Applicable Taxes (as defined in the Agreement) on any Installation
          Charge incurred pursuant to a Supplement and all Lease Payments are to
          be paid by Carrier as and when due. In no event shall Applicable Taxes
          include any franchise or other right of way fees or similar charges or
          impositions assessed upon MFN. Carrier shall have the right to protest
          any new or additional taxes imposed on the Leased Fiber during the
          Lease Term.

     7.   Estimated Installation Completion Dates: To be specified in
          Supplements

     8.   Early Termination Charge:
<PAGE>

    Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

     In the event of termination of this Agreement or any Supplement to this
     Product Order pursuant to Section 11.2 of the General Terms and Conditions
     of this Agreement, Carrier will pay to MFN an Early Termination Charge
     (plus Applicable Taxes) for the affected Leased Fiber determined as
     follows:

     Termination during the first year of the Lease Term - 100% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     first year, plus 80% of all unpaid Leased Fiber Monthly Lease Payments for
     the affected Leased Fiber for the second year, plus 60% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     third year, plus 40% of all unpaid Leased Fiber Monthly Lease Payments for
     the affected Leased Fiber for the fourth year, plus 20% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     fifth year, plus 10% of all unpaid Leased Fiber Monthly Lease Payments for
     the affected Leased Fiber for the sixth through twentieth years.

     Termination during the second year of the Lease Term - 80% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     second year, plus 60% of all unpaid Leased Fiber Monthly Lease Payments
     for the affected Leased Fiber for the third year, plus 40% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     fourth year, plus 20% of all unpaid Leased Fiber Monthly Lease Payments
     for the affected Leased Fiber for the fifth year, plus 10% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     sixth through twentieth years.

     Termination during the third year of the Lease Term- 60% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     third year, plus 40% of all unpaid Leased Fiber Monthly Lease Payments for
     the affected Leased Fiber for the fourth year, plus 20% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     fifth year, plus 10% of all unpaid Leased Fiber Monthly Lease Payments for
     the affected Leased Fiber for the sixth through twentieth years.

     Termination during the fourth year of the Lease Term - 40% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     fourth year, plus 20% of all unpaid Leased Fiber Monthly Lease Payments
     for the affected Leased Fiber for the fifth year, plus 10% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     sixth through twentieth years.

     Termination during the fifth year of the Lease Term - 20% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     fifth year, plus 10% of all unpaid Leased Fiber Monthly Lease Payments for
     the affected Leased Fiber for the sixth through twentieth years.

     Termination during the sixth through twentieth year of the Lease Term -
     10% of all unpaid Leased Fiber Monthly Lease Payments for the affected
     Leased Fiber for the balance of the Lease Term.

     In the event that this Agreement is terminated pursuant to Section 11.2 of
     the General Terms and Conditions, and if Carrier has not yet leased [**]
     fiber miles from MFN hereunder as of the date of any termination, then such
     termination shall be calculated as if Carrier has leased [**] fiber miles
     at the per fiber mile per month price set forth in Section 9.1(b) of this
     Product Order.

9.   Fiber, Locations and Requirements
<PAGE>

    Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

9.1  Carrier acknowledges and agrees that within [**] of the effective date of
     this Agreement, Carrier will lease from MFN pursuant to Supplements for a
     term of two hundred forty (240) months Leased Fiber subject to the terms
     and conditions of this Agreement totaling at least [**] fiber miles in at
     least [**] metropolitan areas where MFN has or reasonably expects to have
     within such [**] period an installed fiber optic network.

     (a)  For the purposes of this Agreement, fiber miles will be calculated by
          multiplying the physical mileage of Carrier's Leased Fiber route(s) by
          the quantity of Leased Fiber along the same route(s).

     (b)  The monthly lease payment for the initial [**] Leased Fiber fiber
          miles that MFN leases to Carrier within [**] of the effective date of
          this Agreement shall be [**] dollars ($[**]) per fiber mile per month
          for the duration of the Lease Term.

     (c)  Carrier further acknowledges and agrees that it shall be liable to MFN
          for any difference that may exist between the monthly lease payment
          for [**]fiber miles and Carrier's actual total Leased Fiber miles
          pursuant to Supplements twenty-four (24) months after the effective
          date of this Agreement (the "Contract Balance") for the period
          beginning at the end of such twenty-fourth month until such time as
          Carrier has leased [**] fiber miles pursuant to Supplements. If such
          difference exists, MFN will provide Carrier written notice of the
          deficiency twenty-three months after the effective date of this
          Agreement and Carrier will then have thirty (30) days to order
          additional fiber subject to the terms and conditions of this Agreement
          necessary to achieve Supplements for [**] Leased Fiber fiber miles. If
          after twenty-four (24) months from the effective date of this
          Agreement Carrier still has not leased from MFN Leased Fiber totaling
          [**] fiber miles pursuant to Supplements, MFN will invoice and Carrier
          will pay a monthly lease payment each month equal to the Contract
          Balance (as the Contract Balance may be reduced in accordance with the
          this paragraph) multiplied by [**] dollars ($[**]) per fiber mile per
          month commencing at the beginning of the twenty-fifth month after the
          effective date of this Agreement until such time as Carrier has leased
          an aggregate of [**] fiber miles pursuant to Supplements. Any such
          amount will be subject to an early termination charge as set forth in
          Section 8. As and when Carrier has leased Leased Fiber miles pursuant
          to Supplements, the Contract Balance shall be reduced by the amount of
          the fiber miles subject to such Supplements. Notwithstanding anything
          to the contrary contained in this provision, Carrier will have no
          liability under this provision in the event that any failure of
          Carrier to lease [**] fiber miles is due to MFN's inability to deliver
          fiber in accordance with any Supplements, including, without
          limitation, any failure of MFN to timely deliver Leased Fiber, any
          failure of any Leased Fiber to meet the Specifications, MFN's failure
          to build to announced build plans, any breach of MFN of the
          representations contained in Section 9.3, and/or any other failure or
          inability of MFN to timely deliver Leased Fiber in accordance with the
          terms of the Agreement.

     (d)  In no event shall Carrier be obligated to lease Leased Fiber from MFN
          in excess of [**] fiber miles.

9.2  Carrier will, from time to time, request fiber pursuant to the terms and
     provisions hereof, by providing MFN with one or more written notices. Each
     such notice shall indicate the number of fibers, the MFN metropolitan
     market and Carrier's proposed Locations. Within thirty (30) days after
     receipt of such notice, MFN will respond to Carrier with a Supplement
     confirming the availability, the monthly lease payment for the Leased Fiber
     subject to the Supplement, the one time installation charge, if any,
<PAGE>

    Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

     and the estimated installation completion date for the requested fiber.
     Carrier may request fiber in any metropolitan area that MFN has or
     reasonably expects to have within twenty-four months of the effective date
     of this Agreement an installed fiber optic network. If Carrier accepts such
     Supplement, Carrier will execute and return to MFN each such Supplement
     within ten (10) days of receipt thereof.

     For any Supplement executed by the parties within twenty-four months of the
     date hereof, MFN shall discount the first twelve months lease payments for
     Leased Fiber pursuant to such Supplements by [**] percent ([**]%).

9.3  Attached hereto as Annex III is a map of every metropolitan area in which
     MFN currently has an existing fiber optic network. Attached hereto as Annex
     IV is a complete listing of every additional metropolitan area in which MFN
     will have a fiber optic network during the twenty-four month period
     following the effective date of this Agreement. For twenty-four months
     after the effective date of this Agreement, MFN commits to provide to
     Carrier upon an executed Supplement up to twenty-four (24) fiber strands
     along any MFN network ring identified in Annex III and, after the date MFN
     has identified such network to be available, Annex IV. Subject to fiber
     availability, MFN will use commercially reasonable efforts to honor
     Carrier's requests for fiber in excess of twenty-four (24) strands along
     such network rings. In no event shall MFN be required to lease to Carrier
     more than forty-eight (48) fiber strands in any single MFN network ring.

9.4  If, within twenty-four months of the effective date of this Agreement,
     Carrier has leased at least [**] fiber miles pursuant to the terms and
     conditions of this Agreement and provided Carrier is not in any material
     breach of this Agreement and, this Agreement is in full force and effect,
     the price for each additional fiber mile that MFN leases to Carrier on MFN
     Networks pursuant to Supplements entered into during the thirty-six month
     period following the effective date of this Agreement shall be the lower of
     the prices set forth below or the then current MFN market rate for such
     additional leased fiber:

               Incremental
Fiber         $/Fiber Mile/
 Mile            Month
-----------------------------
5,001-6,250      [**]
-----------------------------
6,251-7,500      [**]
-----------------------------
7,501-8,750      [**]
-----------------------------
8,751-10,000     [**]
-----------------------------
10,001-11,250    [**]
-----------------------------
11,251-12,500    [**]
-----------------------------
12,501-13,750    [**]
-----------------------------
13,751-15,000    [**]
-----------------------------
15,001-16,250    [**]
-----------------------------
16,251-17,500    [**]
-----------------------------
17,501-18,750    [**]
-----------------------------
18,751-20,000    [**]
-----------------------------
20,001-21,250    [**]
-----------------------------
21,251-22,500    [**]
-----------------------------
22,501-23,750    [**]
-----------------------------
23,751-25,000    [**]
-----------------------------
25,001-26,250    [**]
-----------------------------
<PAGE>

    Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

-----------------------
26,251-27,500 [**]
-----------------------
27,501-28,750 [**]
-----------------------
28,751-30,000 [**]
-----------------------
>30,000       [**]
-----------------------

9.5    Provided Carrier is not in any material breach of this Agreement and this
Agreement is in full force and effect, Carrier may request additional Locations
be added to any then existing Supplement by providing MFN one or more written
requests.  Such orders shall indicate the number of fibers, requested term, and
any relevant information necessary to identify the requested Locations
including, but not limited to, the address, floor, suite, and room number of the
requested Location.  The minimum allowable term shall be one (1) year and the
maximum allowable term shall be coterminous with the Agreement.  Within thirty
(30) days after receipt of such orders, MFN will respond to Carrier with a
revised Supplement confirming the availability, the monthly lease payment, the
one time installation charge, if any, and the estimated installation completion
date for the requested additional Locations.  If Carrier accepts such
Supplement, Carrier will execute and return to MFN each such Supplement within
ten (10) days of receipt thereof.

9.6 If, within thirty-six (36) months of the effective date of this Agreement,
Carrier has leased at least 10,000 fiber miles pursuant to the terms and
conditions of this Agreement and provided Carrier is not in any material breach
of this Agreement and, this Agreement is in full force and effect, then MFN will
extend the pricing set forth in Section 9.4 above for additional fiber leased by
Carrier pursuant to Supplements entered into during the period ending seventy-
two (72) months after the effective date of this Agreement.

9.7  The Lease Term for all of the Supplements to this Product Order shall be
coterminous with the Lease Term for the Supplement with the earliest Service
Date.

10.  MFN address (and contact person) is as follows:

     Metromedia Fiber Network Services, Inc.
     One North Lexington Ave., Fourth Floor
     White Plains, NY  10601
     Attn.:  Vice President - Marketing

     For purposes of declaring a default or termination, a copy of the notice
     must be sent to:

     Vice President - Legal Affairs
     Metromedia Fiber Network Services, Inc.
     One North Lexington Ave., Fourth Floor
     White Plains, NY  10601

     Carrier address (and contact person) is as follows:

     StorageNetworks, Inc.
     100 Fifth Avenue
     Waltham, Massachusetts 02451
     Attn:  Chief Financial Officer
<PAGE>

    Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

     For purposes of declaring a default or termination, a copy of the notice
     must be sent to:

     General Counsel
     StorageNetworks, Inc.
     100 Fifth Avenue
     Waltham, Massachusetts 02451

11.1 At any time after the fifth anniversary of the Service Date for a Leased
     Fiber, Carrier shall have the right to exchange Leased Fiber for alternate
     fiber in another MFN Network. If Carrier desires to make such an exchange,
     Carrier shall give MFN a written request setting forth the number of
     strands of Leased Fiber, the Route and the Locations which Carrier desires
     to exchange, as well as the proposed number of alternate Leased Fibers, the
     MFN metropolitan market in which Carrier desires the alternate Leased Fiber
     and the proposed Locations. Within thirty (30) days after receipt of such
     notice, MFN will respond to Carrier with a Supplement confirming the
     availability of the fiber, the monthly lease payment for the Leased Fiber,
     the one time installation charge, if any (which charge shall include,
     without limitation, MFN's cost to take the old Leased Fiber out of service
     plus [**] percent ([**]%), and the estimated installation completion date
     for the requested fiber. The Lease Term for such new Leased Fiber shall
     equal the balance of the Lease Term for the Leased Fiber that was exchanged
     therefor. If Carrier accepts the Supplement, Carrier will execute and
     return to MFN each such Supplement.

11.2 Notwithstanding anything in Section 11.1 above to the contrary, (i) in no
     event shall Carrier have the right to effect an exchange pursuant to
     Section 11.1 above that would result in the maximum number of fiber strands
     in any single MFN Network ring to exceed the limitations set forth in
     Section 9.3 above, (ii) Carrier shall incur no Early Termination Charges in
     connection with such exchange effected pursuant to Section 11.1 above,
     (iii) in any calendar year during the Lease Term of the Agreement, Carrier
     shall not be permitted to request more than twelve (12) such exchanges of
     Leased Fiber (pro rated for partial calendar years), nor may the quantity
     of Leased Fiber fiber miles exchanged pursuant to such exchanges effected
     pursuant to Section 11.1 above exceed more than [**] percent ([**]%) of the
     total Leased Fiber Miles for which the Service Date has commenced (the "In-
     Service Leased Fiber") during any calendar year (pro rated for partial
     calendar years); and (iv) during the Lease Term of the Agreement, no more
     than [**] percent ([**]%) of the In-Service Leased Fiber may be exchanged
     nor may Carrier request more than sixty (60) such exchanges pursuant to
     Section 11.1 above.

Metromedia Fiber Network Services, Inc.  StorageNetworks, Inc.

By: /s/ Nicholas M. Tanzi              By: /s/ Paul C. Flanagan
    ---------------------                  -----------------------
     Nicholas M. Tanzi                 Name: Paul C. Flanagan
     Senior Vice President                   ---------------------
                                         Title: CFO
                                                ------------------
<PAGE>

    Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

                     Fiber Optic Private Network Agreement
                     -------------------------------------

                          General Terms and Conditions

1.   TERM AND LEASE
     --------------

1.1  MFN hereby leases to Carrier, pursuant to Supplements to be executed by the
     parties, optical fiber ("Leased Fiber") on MFN's fiber optic cable network
     ("Network") and/or constructed and installed specifically for Carrier and
     the equipment and interfaces described in the Supplements to the Product
     Order ("Equipment"), as provided in the Product Order and the Supplements
     thereto. The Leased Fiber and Equipment leased by Carrier will be referred
     to as the "Product". The lease term ("Lease Term") and other specific terms
     pertaining to the Product are set forth in the Supplements. The term
     "Party" will refer, individually, to either MFN or Carrier and the term
     "Parties" will refer to both of them. The term "Agreement" will mean and
     include the Product Order, all Supplements and all Exhibits thereto and
     these General Terms and Conditions.

1.2  MFN will use commercially reasonable efforts to complete installation of
     and provide Carrier with access to the Product by the Estimated
     Installation Completion Date specified in the Supplements at the Locations
     specified in the Supplement ("Turnover Date") and to conduct the testing
     (and provide such test results) detailed in Annex II to the Product Order.
     Carrier will be provided at least ten (10) days prior written notice of the
     tests described in Annexx II to the Product Order and will be permitted to
     observe, or have its designee observe, such tests. For a period of time not
     to exceed ten (10) business days after the Turnover Date (the "Acceptance
     Test Period"), Carrier will conduct such testing as it reasonably deems
     necessary to ensure that the Product conforms in all material respects to
     the material technical specifications set forth in the applicable Exhibit A
     to the Supplement ("Specifications"). Carrier will use commercially
     reasonable efforts to complete such acceptance testing and notify MFN in
     writing within five (5) business days after the Turnover Date, but in any
     event within the Acceptance Test Period, of acceptance or of any
     "Deficiencies" (as defined herein) in such Product. Deficiencies exist if
     the Product does not conform in all material respects to the relevant
     Specifications. Upon receipt of such notification from Carrier, MFN will
     promptly undertake correction of such Deficiencies and restore access to
     and use of such Product to Carrier. The "Service Date," whereupon the Lease
     Term commences for such Product, will be the earlier of (i) the date
     Carrier accepts such Product following completion of testing and acceptance
     of such Product by Carrier, (ii) expiration of the AcceptanceTest Period
     or, (iii) if Carrier has identified Deficiencies, then the first date upon
     which such Product conforms in all material respects with the relevant
     Specifications.

1.3  Carrier will obtain all necessary approvals for access into the Location
     buildings and for the use of any required building riser conduit or other
     required building facilities at all Locations to the extent that MFN has
     not actually obtained such approvals previously. Unless otherwise provided
     for in the Product Order, if there is no existing and available riser
     conduit or other required facilities within such buildings then Carrier
     shall arrange to have such riser constructed at its own cost or (ii) have
     MFN perform all construction and installation of such riser conduit at
     Carrier's expense, which shall be MFN's cost to contract and install such
     riser conduit plus [**] percent ([**]%) plus Applicable Taxes. To the
     extent that Carrier is required to obtain all necessary approvals as
     described above and such approvals are not obtained within ninety (90) days
     of the effective date of the applicable Supplement, either party may
     terminate the affected Location, or if such termination renders the
     applicable Product unusable, the affected Supplment. In any and all such
     events, Carrier shall reimburse MFN for all of its reasonable costs and
     expenses incurred through the date of termination in connection with such
     terminated Location or Supplement to the extent such costs and expenses
     were included with the Installation Charge for such Supplement. If
<PAGE>

    Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

     during the Lease Term MFN permits other customers of MFN to use the
     building riser conduit for which Carrier has paid the construction cost
     therefor, then MFN will rebate a portion of such construction costs as
     follows: If one such additional customer, MFN will rebate to Carrier
     [**]percent of such construction costs; if two such additional customers,
     MFN will rebate to Carrier an aggregate of [**] percent ([**]%) of such
     construction costs; and if three or more such additional customers, MFN
     will rebate to Carrier an aggregate of [**] percent ([**]%). MFN shall
     notify Carrier within ten (10) days of any other customer's use of such
     riser or conduit. In no event shall any such additional customers disturb
     or interfere with Carrier's use of the Product.

1.4  Upon the expiration of the Lease Term, or any earlier termination of this
     Agreement or a Supplement, Carrier will promptly remove from any property
     owned, leased or licensed by MFN all Carrier property, equipment and other
     materials used in connection with the applicable Product within forty five
     (45) days from such expiration or termination. Carrier will complete such
     removal in a manner that does not interfere with or damage the Product or
     the Network. If Carrier fails to remove its property within such period,
     such property will be deemed abandoned, and MFN will make such disposition
     of the property as it deems necessary or advisable at Carrier's sole,
     reasonable expense.

2. TERMS OF PAYMENT
   ----------------

2.1  Unless otherwise provided for in the Product Order, Carrier agrees to pay
     the One Time Installation Charge, if any, as provided in each Supplement,
     upon the execution of the Supplement . Carrier will pay to MFN all
     applicable sales or other taxes other than taxes on or measured by MFN's
     income or capital, ("Applicable Taxes"), unless Carrier is eligible for an
     exemption and Carrier provides to MFN an exemption certificate or other
     documentation. Commencing on the Service Date for each Supplement and
     continuing each month thereafter for the duration of the Lease Term,
     Carrier will pay the Monthly Lease Payment for such Supplement plus
     Applicable Taxes in advance for each month. If the Service Date commences
     after the first day of any month or terminates before the last day of a
     month, then the payment for such partial month will be pro rated based on
     the number of days of the Lease Term during that month to the number of
     days in that month. Carrier will include such pro rata payment for the
     initial partial month in the first monthly payment at the commencement of
     the Lease Term for such Supplement.

2.2  If Carrier fails to pay any sum when due pursuant to this Agreement, then,
     in addition to such sum, Carrier will pay interest on such unpaid sum at
     the lower of the highest legal rate of interest permitted in the State of
     New York or one and one-half percent (1.5%) per month.

3. MAINTENANCE, RESTORATION AND REPAIR OF THE NETWORK AND PRODUCT MONITORING
   -------------------------------------------------------------------------

3.1  MFN will provide remote monitoring of the Network and the Product to the
     extent that the Product is incorporated into the Network. MFN will use
     commercially reasonable efforts to maintain the Product in accordance with
     the Specifications (subject to reasonable wear and tear) and the Network in
     good operating condition at all times during the Lease Term. The foregoing
     maintenance will be at no additional charge to Carrier, except as set forth
     in Section 3.4 hereof.

3.2  An "Outage" will mean the complete interruption of communications, or the
     material degradation of performance below the Specifications, on one or
     more of Carrier's Leased Fibers. If an Outage or any other material
     degradation of service on any Leased Fibers occurs Carrier will immediately
     notify MFN by telephone at (888) 636-2778 or through such other
     notification procedure as Parties may establish. Provided that MFN
     personnel or
<PAGE>

    Confidential Materials omitted and filed separately with the Securities
              and Exchange Commission. Asterisks denote omissions.

     contractors have access to affected Carrier facilities immediately upon
     notification, MFN will respond and commence work within two (2) hours after
     the time of notification by Carrier and restore effective use of the
     Product as expeditiously as practicable, but in no event more than four (4)
     hours after receipt by MFN of Carrier's notification, subject to "Force
     Majeure" as provided in Section 11 hereof.

3.3  Except for any Outage caused by or resulting from (i) Force Majeure as set
     forth in Section 11 hereof; (ii) the act or omission of Carrier, its
     employees, agents or contractors; (iii) any of Carrier's equipment or
     facilities used in connection with the Product; or (iv) planned Outages by
     reason of Services which have been scheduled and approved in advance by
     Carrier ("Excepted Outages") in the event of an Outage, Carrier will
     receive from MFN a credit ("Outage Credit") calculated at [**]% of the
     Leased Fiber Monthly Lease Payment for the affected Leased Fiber strands
     for each [**] hours of Outage, up to a maximum of the Leased Fiber Monthly
     Lease Payment for the affected Leased Fiber for [**] full months. Except in
     the case of a termination as provided in this Section 3, the Outage Credit
     will be applied against future payments which may become due and payable by
     Carrier to MFN. The Outage Credit will be determined by multiplying the
     number of affected fibers by the total route length of the ring such fibers
     are on, times the Monthly Lease Payment for such affected fibers, times
     [**]%, times the number of [**] hour Outage periods, up to the maximum set
     forth above. The Outage Credit will be in the form of a cash payment to
     Carrier by MFN if this Agreement is terminated with respect to the affected
     fiber by either Party as provided in Section 3.4 hereof. Outage Credits
     will not be credited or payable for any period of time during which MFN
     personnel or contractors are denied access to Carrier Locations or other
     facilities to remedy an Outage.

3.4  If an Outage occurs and continues for a period longer than [**] days for
     any reason other than "Force Majeure" as defined in this Agreement, then at
     any time thereafter, unless and until such Outage is corrected, Carrier can
     terminate the Supplement with respect to the Product subject to the Outage
     by written notice of such termination delivered to MFN. If there are
     Outages that occur for a cumulative period of longer than 360 hours in any
     36 month period for any reason other than "Force Majeure", then for a
     thirty (30) day period thereafter, Carrier may terminate the Supplement
     with respect to the Product subject to such Outages by written notice of
     such termination to MFN. If so terminated, Carrier will have no further
     obligations with respect to such Supplement, including, without limitation,
     any obligation to make any early termination payment with respect to such
     Supplement. Notwithstanding the foregoing, if such Outage occurs and
     continues by reason of a breach by a Carrier of its obligations under this
     Agreement, Carrier will not have any right to terminate this Agreement. The
     Outage Credit and right to terminate will be the sole and exclusive remedy
     of Carrier and liability of MFN for any Outage regardless of the cause of
     such Outage.

3.5  If all or part of the Product requires restoration, replacement or repair
     by reason by any breach of this Agreement by Carrier, its employees,
     agents, or contractors or any of Carrier's equipment or facilities used in
     connection with the Product , such repair, replacement and/or restoration
     will be made by MFN, at Carrier's sole expense, in accordance with MFN's
     then current time and materials rates plus Applicable Taxes. In addition,
     Carrier will not receive any Outage Credit by reason of the foregoing.

3.6  MFN may assign or subcontract to any third party any or all of its
     performance obligations (including, without limitation, maintenance) under
     this Agreement and Product Order at any time, without the consent of
     Carrier, provided that MFN will remain obligated for such performance in
     accordance with the terms of this Agreement.

3.7  MFN will have the right to inspect Carrier's use of the Product at any time
     and from time to time during normal business hours upon at least
     `twenty-four (24) hours" prior notice by MFN.
<PAGE>

4. USE AND OWNERSHIP OF THE PRODUCT
   --------------------------------

4.1  Carrier will not, by itself or through any agent or contractor, make any
     repair to or replacement of the Product or the Network or any other
     equipment or facilities provided by MFN in connection with the Product or
     otherwise. Carrier will not install any equipment to be used with the
     Product or use the Product in any manner which damages or adversely
     interferes with the Product or the Network.

4.2  Carrier will use the Product in full compliance with all applicable
     federal, state and local laws, rules and regulations and all applicable
     franchises, rights of way, leases, licenses, contracts and other
     obligations to third parties (of which it has actual knowledge) with
     respect to the Network or Product. Carrier will obtain and maintain in
     effect during the Lease term all rights, leases, licenses, permits and
     governmental or non-governmental approvals necessary for use of the Product
     by Carrier and its customers.

4.3  Carrier acknowledges and agrees that the Product is provided for use (1)
     exclusively by Carrier and/or affiliated or permitted successor entities
     which control or are controlled by or commonly controlled with Carrier
     ("Affiliates") (2) customers of Carrier and (3) in either case only in the
     ordinary course of business of Carrier. For purposes of this Agreement, the
     ordinary course of Carrier's business shall not include the sale, leasing
     or granting of any rights of use in "dark fiber", as such term is commonly
     understood in the telecommunications industry. Carrier will not without
     MFN's prior written consent, which consent may be withheld at MFN's sole
     discretion, (a) permit or provide access to or use of the Product, in whole
     or part, to any third party (other than a customer of Carrier in the
     ordinary course of business of Carrier), pursuant to (by way of example and
     not in limitation) sublease, license, sublicense or resale, or any other
     right to use, or (b) share or otherwise utilize in conjunction with a third
     party (including without limitation in any joint venture or as part of any
     outsourcing activity) any of the Product. Any breach of this Section 4.3
     will be deemed to be a material breach of this Agreement and in the event
     of such material breach MFN will have the right to immediately terminate
     this Agreement, any applicable Product Orders and Carrier's access to the
     Network, in addition to any and all rights and remedies.

4.4  MFN retains all right, title and interest in and to the Product and the
     Network to the points within the locations specified in the Product Order
     at which MFN's facilities end and Carrier's facilities begin, subject only
     to the grant of access and use provided to Carrier pursuant to this
     Agreement.

4.5  Subject to Section 1.3 hereof, MFN reserves the right to utilize unused
     external building access and space within the building conduit(s)
     constructed by MFN and occupied by the Product at the Locations and
     otherwise, provided that such use does not interfere with or hinder
     Carrier's use of its Product as permitted hereunder.

4.6  MFN shall keep the Product and the Network free from any liens, rights or
     claims of any third party that may materially and adversely affect the
     right of Carrier to use the Product hereunder; provided, however, that MFN
     may pledge the Network so long as MFN uses commercially reasonable efforts
     to obtain a non- disturbance agreement in favor of Carrier.

4.7  MFN and Carrier shall promptly notify each other of any matters pertaining
     to, or the occurrence (or impending occurrence) of, any event of which it
     is aware that could give rise to any damage or impending damage to the
     Product or the Network.

4.8  MFN and Carrier agree to cooperate with each other in complying with any
     requirements applicable to their respective rights and obligations
     hereunder by any Governmental Authority.
<PAGE>

5. AUTHORIZATIONS; RELOCATION; CONDEMNATION
   ----------------------------------------

5.1  "Authorization(s)" will mean all material and applicable governmental or
     non-governmental licenses, easements, rights of way, conduit, pole
     attachment and any other facilities or property rights, licenses,
     contracts, franchises, approvals, permits, orders, consents, and all other
     rights required for MFN to operate and maintain the Network or provide the
     Product to Carrier pursuant to this Agreement.

5.2  MFN will have or obtain by the Service Date, all Authorizations and will
     use commercially reasonable efforts to maintain or renew all such
     Authorizations through the Lease Term and replace such Authorizations with
     reasonably suitable replacement Authorizations if any expire or are
     terminated or discontinued during the Lease Term. If any Authorizations are
     modified, terminated or discontinued and not replaced, and the loss of such
     Authorizations threatens to cause or does cause material financial harm to
     MFN, or prevents or materially interferes with MFN's control, possession
     and/or use of the Network or ability to lease the Product or materially and
     adversely affects the use by Carrier of the Product, then MFN will, at
     Carrier's option, either (i) provide at no cost to Carrier, replacement
     Product or fiber optic capacity on portions of MFN's then existing Network
     (and/or other MFN Networks, including networks belonging to or controlled
     by MFN Affiliates) or on networks of third parties, or (ii) terminate this
     Agreement with respect to the affected Product. The foregoing will be MFN's
     sole and exclusive liability and Carrier's sole and exclusive remedy with
     respect to the foregoing.

5.3  If MFN receives notice of any request, intent or plan by any governmental
     or non-governmental third party, to relocate any material part of the
     Product or any material segment of MFN's Network used in the provision of
     the Product, MFN will promptly notify Carrier of such request, intent, or
     plan. If MFN is required by any such third party to relocate any segment of
     MFN's network used in providing the Product, MFN will give Carrier at least
     one hundred eighty (180) days (or such lesser period of notice that MFN may
     have received) prior written notice of any such relocation ("Relocation
     Notice"). Together with the Relocation Notice, MFN will provide an estimate
     of the cost of such relocation. MFN will relocate the Leased Fibers, and,
     to the extent MFN is not reimbursed for the cost of such relocation by a
     third party, governmental entity or otherwise, Carrier will pay its pro
     rata share of the costs associated with the relocation of the Product based
     upon Carrier's fiber count in such relocated fiber; except, however, that
     Carrier shall have no such payment obligation to the extent that such
     relocation is the direct result of any negligent or willful act or omission
     of MFN. MFN will use its commercially reasonable efforts to secure an
     agreement for reimbursement from any third party, governmental entity or
     otherwise, requiring any relocation of the Network and the Product.

5.4  If any portion of the Network or the Product and/or the Authorizations in
     or upon which the Product has been installed, become the subject of a
     condemnation proceeding which is not dismissed within one hundred eighty
     (180) days after the date of filing of such proceeding and which could
     reasonably be expected to result in a taking by any governmental agency or
     other party having the power of eminent domain for public purpose or use,
     both Parties will be entitled, to the extent permitted under applicable
     law, to participate in any condemnation proceedings for compensation by
     either joint or separate awards for the economic value of their respective
     interests in the Leased Fibers that are subject to such condemnation
     proceeding.
<PAGE>

6. WARRANTIES
   ----------

6.1  MFN warrants to Carrier that upon the applicable Service Dates the Product
     will operate in accordance with the Specifications related thereto.

       EXCEPT AS OTHERWISE EXPRESSLY PROVIDED IN THIS AGREEMENT, MFN DISCLAIMS
       ALL WARRANTIES WHETHER EXPRESS OR IMPLIED INCLUDING ANY AND ALL
       WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE WITH
       RESPECT TO THE (i) NETWORK OR PRODUCT, (ii) THE LEASE GRANTED PURSUANT
       HERETO, (iii) MAINTENANCE SERVICES (iv) CONSTRUCTION AND INSTALLATION
       SERVICES, IF ANY, AND (v) ANY OTHER SERVICE(S) (HEREINAFTER (iii) THROUGH
       (v) WILL COLLECTIVELY BE REFERRED TO AS "SERVICES") PROVIDED BY OR ON
       BEHALF OF MFN HEREUNDER.

7. LIABILITY/INDEMNIFICATION
   -------------------------

7.1  Except for the gross negligence or willful misconduct of a Party hereto and
     except where a specific remedy is provided in this Agreement, the liability
     of each Party to the other Party for damages will be limited to the total
     Installation Charges, if any, the Monthly Lease Payments paid or payable by
     Carrier for the Lease Term during which the damages were incurred. In no
     event will either Party be liable to the other Party for any incidental,
     indirect, special, consequential, exemplary, or punitive damages arising
     out of or relating to this Agreement, the lease granted hereunder, the
     Network, Product or Services provided hereunder, including damages based on
     loss of revenues, profits or lost business opportunities, regardless of
     whether the respective Party had been advised of or could have foreseen the
     possibility of such damages.

7.2  MFN agrees to indemnify, defend and hold Carrier, its officers, directors,
     employees, agents and contractors harmless from and against all loss,
     damage, liability, cost and expense (including reasonable attorney's fees
     and expenses) by reason of any claims or actions by third parties for (i)
     bodily injury, including death and, (ii) damage, loss or destruction of any
     real or tangible personal property (including without limitation the
     Network and Product) which third party claims arise out of or relate to (a)
     any Product or Services provided by or on behalf of MFN hereunder, (b)
     MFN's performance of or failure to perform any term, condition or
     obligation under this Agreement, or (c) any act or omission of MFN's
     directors, agents, employees, contractors, representatives or invitees.
     Carrier agrees to indemnify, defend and hold MFN, its officers, directors,
     employees, agents and contractors harmless from and against all loss,
     damage, liability, cost and expense (including reasonable attorney's fees
     and expenses) by reason of any claims or actions by third parties for (i)
     bodily injury, including death and (ii) damage, loss or destruction of any
     real or tangible personal property (including, without limitation, the
     Network and Product) which third party claims arise out of or relate to (a)
     Carrier's performance of or failure to perform any term, condition or
     obligation under this Agreement, or (b) any act or omission of Carrier's
     directors, agents, employees, contractors, representatives or invitees; or
     (c) Carrier's or its customer's use of the Product and conduct of their
     respective businesses including without limitation the content of any
     video, voice or data carried by Carrier or its customers on the Product or
     Network.

7.3  Except as otherwise set forth in this Agreement, nothing contained herein
     will operate as a limitation on the right of either Party to bring an
     action for damages against any third party based on any act or omission of
     such third party as such act or omission may affect the construction,
     operation, or use of the Product. Each Party agrees to execute such
     documents and provide such commercially reasonable assistance, at the
     claiming Party's
<PAGE>

     sole expense, as may be reasonably necessary to enable the claiming Party
     to pursue any such action against such third party.

8. CONFIDENTIALITY
   ---------------

8.1  The Parties acknowledge and agree that this Agreement and the information
     each Party has provided or will provide in connection with this Agreement
     or that the other Party learns or obtains from a source other than public
     domain or from a source (including a Party) not in violation of any
     obligation of confidentiality, are and will be confidential and proprietary
     to the Party providing such information (the "Providing Party"). The Party
     in receipt of or learning or obtaining the confidential information (the
     "Receiving Party") agrees not to distribute, use or disclose to any third
     party or use (except for the purposes of this Agreement) the confidential
     information of the Providing Party.

8.2  Except as may be required by applicable legal requirements in the course of
     defending or prosecuting a legal, insurance or other claim or as required
     by applicable law, rule or regulation, Receiving Party will restrict
     dissemination of confidential information to only those persons who must
     have access to such confidential information in order to perform their
     respective rights or obligations hereunder. The Receiving Party will
     promptly notify the Disclosing Party of any such required disclosure to
     enable the Disclosing Party to seek protective relief therefrom and shall
     cooperate as the Disclosing Party may request in connection therewith.

8.3  Carrier may disclose the identity of MFN as a supplier of Carrier, and MFN
     may disclose the identity of Carrier as customer of MFN, each with the
     prior written consent from the other; which consent will not be
     unreasonably withheld or delayed; provided, that no such disclosure shall
     imply any endorsement of the disclosed Party or contain any misleading
     reference to the nature of the relationship between the Parties.

8.4  Each Party acknowledges and agrees that the information of the Disclosing
     Party described in this Section 8 constitutes valuable property of the
     Disclosing Party and that Disclosing Party will suffer irreparable injury
     not compensable by money damages for which the Disclosing Party will not
     have an adequate remedy at law in the event of a breach by the Receiving
     Party of the provisions of this Section 8 and therefore the Disclosing
     Party shall be entitled to injunctive relief to prevent or curtail any such
     breach, threatened or actual. The foregoing shall be without prejudice to
     or limitation on any other rights a Party may have under this Agreement, at
     law or in equity.

9. NOTICES
   -------

Unless otherwise provided herein, all notices and communications concerning this
Agreement will be in writing and sent to the address (and contact person)
specified in the Product Order, or at such other address as may be designated in
writing by a Party. Unless otherwise provided herein, notices will be sent by
certified US Postal Service, return receipt requested, or by commercial
overnight delivery service, or by facsimile, and will be deemed delivered, if
sent by US Postal Service, five (5) days after deposit, if sent by facsimile,
upon verification or receipt or, if sent by commercial overnight delivery
service, one (1) business day after deposit therewith.

10.  RENEWAL TERM
     ------------

Provided that Carrier is not in breach of any of its material obligations under
this Agreement and subject to the conditions of this Agreement, Carrier may
renew the term of this Agreement for the Product for one (1) additional renewal
term upon the terms and conditions of this Agreement, except for the length of
such renewal term and the Installation and Lease Fee payments, which the Parties
will negotiate in good faith following Carrier's written request for renewal
delivered to
<PAGE>

MFN no earlier than one year before the scheduled expiration date of the initial
term and no later that ninety (90) days before such expiration date.

11.  TERMINATION/FORCE MAJEURE
     -------------------------

11.1 If any of the following events of default occur, the non-breaching Party
     will have the right to terminate this Agreement or, if applicable, the
     affected Supplement, by written notice following the expiration of any
     periods of time included in the following, such termination to be effective
     on the date set forth in the written notice of termination:

     11.1 (a) If Carrier terminates any Supplement at any time before the
          expiration of the Lease Term (whether before or after the Turnover
          Date) or fails to make any payment hereunder within thirty (30) days
          or receipt of written notice of late payment from MFN, MFN will have
          the right to terminate such Supplement and/or deny access by Carrier
          to the affected Product immediately without further notice to Carrier.

     11.1 (b) If a Party breaches any material term or condition of this
          Agreement (including specifically, and without limitation, any failure
          by MFN to deliver Product that meets the Specifications) and such
          breach remains uncured thirty (30) days after delivery to the
          breaching Party of written notice of such breach, unless the breach is
          of a nature or involves circumstances requiring more than thirty (30)
          days to cure, the time period may be extended for such time as will be
          reasonably required, provided the defaulting party proceeds diligently
          to cure the breach.

     11.1 (c) A Party applies for or consents to the appointment of a receiver,
          trustee or similar officer for it or any substantial part of its
          property or assets, or any such appointment is made without such
          application or consent by such Party and remains undischarged for a
          period of sixty (60) days; or

     11.1 (d) A Party consents to, or fails to contest, the institution of a
          petition or other application of any involuntary bankruptcy,
          insolvency or reorganization proceeding and any such proceeding as
          instituted against such Party remains undischarged for a period of
          sixty (60) days.

11.2 In the event of termination of a Supplement by MFN pursuant to Section 11.1
     hereof or by Carrier after execution of the Supplement and before the end
     of the Lease Term (other than by Carrier for cause as provided in this
     Section 11), MFN will be entitled to receive, and Carrier will immediately
     pay, the early termination charge ("Early Termination Charge") set forth in
     the Product Order and such liquidated damages shall be Carrier's sole
     liability, and MFN's sole remedy, hereunder.

11.3 If any Authorization is modified, terminated or discontinued and not
     replaced as provided in Section 5.2 of these General Terms and Conditions,
     and MFN has not notified Carrier in writing within thirty (30) days after
     the occurrence of such modification, termination or discontinuance that MFN
     will provide replacement Product or capacity as provided in Section 5.2,
     then and thereafter Carrier has the right, exercisable in its sole
     discretion, to terminate the applicable Supplement with respect to the
     affected Product upon thirty (30) days prior written notice (or such other
     notice as is practicable under the circumstances) without liability
     whatsoever by Carrier to MFN or any party claiming by, through or under
     MFN.

11.4 Neither Party will be in breach of this Agreement resulting from delay or
     prevention of performance of such Party which is caused by any act
     attributable to an occurrence or an event of "Force Majeure" as defined
     herein. Neither party will, however, be relieved of liability for failure
     of performance due to a claimed Force Majeure hereunder if such failure is
     due to causes arising out of its own negligence or to removable or remedial
     causes that it
<PAGE>

     fails to remove or remedy using commercially reasonable efforts and within
     a reasonable period of time. In an event of Force Majeure occurs and is
     continuing for a period in excess of thirty (30) days and results in
     Carrier's inability to utilize any Product, either party will have the
     right to terminate the Supplement relating to the affected Product and
     neither party shall have any liability to the other with respect to such
     affected Product or such termination.

11.5 The term "Force Majeure" will mean any cause beyond the control of Carrier
     (or MFN, as applicable) which, by the exercise of due foresight, Carrier
     (or MFN) could not reasonably have been expected to avoid, and which by the
     exercise of reasonable diligence, Carrier (or MFN) will be unable to
     overcome, including but not limited to action by governmental authority
     including without limitation moratorium on any activities related to the
     Agreement, third party labor dispute, flood, earthquake, fire, lightning,
     epidemic war, riot, civil disturbance, sabotage and the like. The party
     affected by an event of Force Majeure (the "Affected Party") will notify
     the other party (the "Other Party") promptly of any occurrence or condition
     which, in the Affected Party's reasonable opinion, warrants an extension of
     time. Such notice will specify in detail the anticipated length of delay,
     the cause of the delay and a timetable by which any remedial measures will
     be implemented.

12.  ASSIGNMENT; SUCCESSION
     ----------------------

12.1 Carrier may assign this Agreement to any of its Affiliates or to any
     successor by merger, consolidation, purchase or acquisition of all or
     substantially all of the assets or capital stock of Carrier. Upon any
     permitted assignment (or delegation) hereunder, Carrier will remain jointly
     and severally responsible for the performance under this Agreement, unless
     released in writing by MFN. Any permitted assignee will expressly assume
     all liabilities hereunder prior to the effectiveness of such assignment.
     Any attempted assignment or delegation without such consent will be null
     and void and may be deemed by MFN, in its sole discretion, to constitute a
     material breach of this Agreement.

12.2 The Agreement and Product Order will be binding upon and inure to the
     benefit of the Parties hereto and their respective successors and permitted
     assigns.

13.  GOVERNING LAW
     -------------

13.1 THIS AGREEMENT WILL BE INTERPRETED AND CONSTRUED IN ACCORDANCE WITH THE
     INTERNAL LAWS OF THE STATE 0F NEW YORK WITHOUT GIVING EFFECT TO ITS
     PRINCIPLES OF CONFLICTS OF LAWS.

14.  SURVIVAL
     --------

The Parties' respective representation, warranties, and covenants, together with
obligations of indemnification, confidentiality and limitations on liability
will survive the expiration, termination or rescission of this Agreement and
continue in full force and effect in accordance with their respective terms.

15.  ENTIRE AGREEMENT
     ----------------

This Agreement, Product Order, Supplements, and all addenda attached hereto
constitute the entire agreement between the parties hereto with respect to the
subject matter hereof and supersede any and all prior negotiations,
understandings, and agreement with respect hereto, whether oral or written,
except for any existing non-disclosure agreements between the parties, which
shall remain in full force and effect in accordance with its or their terms.
<PAGE>

16.  REMEDIES CUMULATIVE
     -------------------

Except as otherwise expressly provided, the rights and remedies set forth in
this Agreement will be in addition to, and cumulative of, all other rights and
remedies at law or in equity.

17.  REPRESENTATIONS, WARRANTIES AND COVENANTS
     -----------------------------------------

Each Party represents, warrants and covenants to the other that (a) it is a
corporation duly organized, validly existing and in good standing under the laws
of the state of its organization, (b) it has all requisite power and authority
to enter into and perform its obligations under this Agreement and Product Order
and (c) this Agreement, when executed, will become the legal, valid and binding
obligation of such Party.

18.  MISCELLANEOUS
     -------------

18.1 The covenants, undertakings, and agreements set forth in this Agreement
     will be solely for the benefit of and will be enforceable only by the
     Parties hereto or their respective successors or permitted assigns.

18.2 The headings of the Sections in this Agreement are strictly for convenience
     and will not in any way be construed as amplifying or limiting any of the
     terms, provisions or conditions thereof.

18.3 In the event any term of this Agreement will be held valid, illegal or
     unenforceable, in whole or in part, neither the validity of the remaining
     part of such term nor the validity of the remaining terms of this Agreement
     will be in any way affected thereby.

18.4 This Agreement may be amended only by a written instrument executed by the
     Parties.

18.5 No failure to exercise and no delay in exercising, on the part of either
     Party hereunder, any right, power or privilege hereunder will operate as a
     waiver hereof, except as expressly provided herein.

18.6 This Agreement may be executed in multiple counterparts, each of which will
     constitute one and the same instrument.

Metromedia Fiber Network Services, Inc.    StorageNetworks, Inc.

      /s/ Nicholas M. Tanzi                    /s/  Paul C. Flanagan
By:  ___________________________             _______________________________
          Nicholas M. Tanzi                  Name:  Paul C. Flanagan
          Senior Vice President              Title: CFO

<PAGE>

                     Fiber Optic Private Network Agreement

                                    Exhibit A

                           Leased Fiber Specifications
                           ---------------------------

MFN will perform fiber testing as described below on each Leased Fiber and will
provide the documentation (hard copy and/or diskette) of results to the Carrier
at the Turnover Date.  Each "span" will be defined in documentation included in
the Carrier's Turnover Date package.  Acceptance of a span by Carrier will be an
acknowledgement by the Carrier that all Leased Fiber complies with all
performance criteria contained herein.

1)   Power testing: This end-to-end loss measurement will be conducted for each
     Leased Fiber in the span and from both directions using an
     industry-accepted laser source and power meter. The bi-directional average
     will be used to determine the end-to-end loss of the span at each
     appropriate wavelength. This test will be conducted at both 1310 nm and
     1550 nm for Standard Single Mode Fiber; Dispersion Shifted Fiber (True
     WaveTM, LEAFTM, etc.) will be tested at 1550 nm only. In the event that a
     span consists of both Standard Single Mode and Dispersion Shifted fiber
     types, only 1550 nm testing will be conducted. This power testing will
     ensure fiber continuity and the absence of crossed fibers in the span.
     Power testing will only be conducted where the Leased Fiber is terminated
     by MFN in fiber distribution panels at both ends of the span.

2)   OTDR testing: All traces will be provided in hard copy and diskette form
     using GR 196 format. This testing will be conducted at both 1310 nm and
     1550 nm wavelengths when the Leased Fiber consists of Standard Single Mode
     Fiber, but will be done at 1550 nm only if the Leased Fiber consists of
     either Dispersion Shifted Fiber (True-WaveTM, LEAFTM, etc.) or a
     combination of Single Mode and Dispersion Shifted fiber types.

     OTDR testing will be conducted on a bi-directional basis for each Leased
     Fiber in each span at the appropriate wavelengths for the Leased Fiber
     described above. However, if due to length or attenuation reasons that the
     Leased Fiber span exceeds the dynamic range of an OTDR, a portion or all of
     the span may be tested on a unidirectional basis only. Alternatively, the
     Leased Fiber span may be divided into shorter testing spans, to the extent
     reasonably possible, in order to obtain bi-directional analysis. Also, in
     instances where a Carrier intends to accept Leased Fiber that is not
     terminated at one end by MFN in a fiber distribution panel (such as in a
     manhole or handhole) only unidirectional testing will be performed.

     The Turnover documentation package delivered at the Turnover Date will
     contain the actual traces that detail the testing parameters (including
     pulse width, averaging and range). The average bi-directional splice loss
     for all splices within each span will be of 0.15 dB or less while each
     connector pair (such as at a FDP) will have an average bi-directional
     connector loss for all splices within each span of 0.5 dB or less for all
     connectors within each span. (Note that the front and end connector of the
     span can only be measured uni- directionally and will also have a loss
     equal to or less than 0.5 dB). In the event that OTDR acceptance testing
     must be done on a unidirectional basis (for reasons described above), an
     average per span splice loss will be 0.30 dB.

     All traces will be provided in hard copy and/or diskette form using GR 196
     format. If the average bi-directional splice loss of each span exceeds 0.15
     dB (or 0.30 dB uni-directionally), MFN will provide upon the Carrier's
     request documentation of at a least three attempts to reduce this value to
     below 0.15 dB (0.30 dB uni-directionally). The only exception to this
<PAGE>

     will be in the instance of a splice between two different fiber types
     (Standard Single-mode to Dispersion Shifted, Depressed-Clad to Matched
     Clad, fibers with different mode-field diameters).

Carrier should also note that the loss and/or reflectance of the front-end
connector (as measured using a launch cord) is only an indicator of a problem
such as a defective port, bulkhead, or the like.  Since a different patch cord
will be used by  Carrier (that connects to their equipment, for example) to mate
to this connector, a different loss and/or reflectance may occur.
<PAGE>

                                     Annex I

                                   Supplement

Reference is made to the Fiber Optic Private Network Agreement dated October 8,
1999 ("Agreement") by and between Metromedia Fiber Network Services, Inc.
("MFN"), One North Lexington Ave., Fourth Floor, White Plains, New York 10601,
and StorageNetworks, Inc. ("Carrier"), 100 Fifth Avenue, Waltham, Massachusetts
02451, to which this Supplement effective __________ shall be attached and is
hereby made a part thereof.  The Agreement is hereby supplemented as follows:

Carrier hereby orders and MFN hereby agrees to provide Leased Fiber as follows:

     1.   Lease Term: Coterminous with the Lease Term for the Supplement with
          the earliest Service Date.

     2.   Number of Leased Fibers:

     3.   Number of Leased Fiber Miles:

     4.   Carrier locations ("Location(s)"):

     5.   Specifications pertinent to the Leased Fiber: Exhibit to the
          Supplement.

     6.   Installation Charge and Monthly Lease Payments:

          6.1  One Time Installation Charge:

          6.2  Monthly Lease Payments:

          Applicable Taxes (as defined in the Agreement) on any Installation
          Charge incurred pursuant to this Supplement and all Lease Payments are
          to be paid by Carrier as and when due. In no event shall Applicable
          Taxes include any franchise or other right of way fees or similar
          charges or impositions assessed upon MFN. Carrier shall have the right
          to protest any new or additional taxes imposed on the Leased Fiber
          during the Lease Term.

     7.   Estimated Installation Completion Dates:

     8.   Early Termination Charge:

          In the event of termination of this Supplement pursuant to Section
          11.2 of the General Terms and Conditions of this Agreement, Carrier
          will pay to MFN an Early Termination Charge (plus Applicable Taxes)
          for the affected Leased Fiber determined as follows:
<PAGE>

     Termination during the first year of the Lease Term - 100% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     first year, plus 80% of all unpaid Leased Fiber Monthly Lease Payments for
     the affected Leased Fiber for the second year, plus 60% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     third year, plus 40% of all unpaid Leased Fiber Monthly Lease Payments for
     the affected Leased Fiber for the fourth year, plus 20% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     fifth year, plus 10% of all unpaid Leased Fiber Monthly Lease Payments for
     the affected Leased Fiber for the sixth through twentieth years.

     Termination during the second year of the Lease Term - 80% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     second year, plus 60% of all unpaid Leased Fiber Monthly Lease Payments for
     the affected Leased Fiber for the third year, plus 40% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     fourth year, plus 20% of all unpaid Leased Fiber Monthly Lease Payments for
     the affected Leased Fiber for the fifth year, plus 10% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     sixth through twentieth years.

     Termination during the third year of the Lease Term - 60% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     third year, plus 40% of all unpaid Leased Fiber Monthly Lease Payments for
     the affected Leased Fiber for the fourth year, plus 20% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     fifth year, plus 10% of all unpaid Leased Fiber Monthly Lease Payments for
     the affected Leased Fiber for the sixth through twentieth years.

     Termination during the fourth year of the Lease Term - 40% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     fourth year, plus 20% of all unpaid Leased Fiber Monthly Lease Payments
     for the affected Leased Fiber for the fifth year, plus 10% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     sixth through twentieth years.

     Termination during the fifth year of the Lease Term - 20% of all unpaid
     Leased Fiber Monthly Lease Payments for the affected Leased Fiber for the
     fifth year, plus 10% of all unpaid Leased Fiber Monthly Lease Payments for
     the affected Leased Fiber for the sixth through twentieth years.

     Termination during the sixth through twentieth year of the Lease Term -
     10% of all unpaid Leased Fiber Monthly Lease Payments for the affected
     Leased Fiber for the balance of the Lease Term.

9.   Fiber, Locations and Requirements

10.  MFN address (and contact person) is as follows:

     Metromedia Fiber Network Services, Inc.
     One North Lexington Ave., Fourth Floor
     White Plains, NY  10601
<PAGE>

     Attn.:  Vice President - Marketing

     For purposes of declaring a default or termination, a copy of the notice
     must be sent to:

     Vice President - Legal Affairs
     Metromedia Fiber Network Services, Inc.
     One North Lexington Ave., Fourth Floor
     White Plains, NY  10601
<PAGE>

     Carrier address (and contact person) is as follows:

     StorageNetworks, Inc.
     100 Fifth Avenue
     Waltham, Massachusetts 02451
     Attn:  Chief Financial Officer

     For purposes of declaring a default or termination, a copy of the notice
     must be sent to:

     General Counsel
     StorageNetworks, Inc.
     100 Fifth Avenue
     Waltham, Massachusetts 02451

Metromedia Fiber Network Services, Inc.     StorageNetworks, Inc.

By:  /s/ Nicholas M. Tanzi                  By: /s/ Paul C. Flanagan
    ---------------------------               -------------------------
     Nicholas M. Tanzi                      Name:   Paul C. Flanagan
     Senior Vice President                  Title:  CFO

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