Document:

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                                                                   Exhibit 10.17

     THIS AMENDED AND RESTATED INTER-COMPANY SERVICES AGREEMENT, dated as of
August 31, 2000, is by and between IFX Corporation, a Delaware corporation
("IFX"), and Tutopia.com, Inc., a Delaware corporation ("Tutopia"). Capitalized
terms used herein and not otherwise defined shall have the respective meanings
assigned to them in Article I hereof.

     WHEREAS, IFX is an investor in Tutopia; and

     WHEREAS, IFX will provide various services to Tutopia and the parties
desire to memorialize certain matters relating to the relationship between IFX
and Tutopia.

     NOW, THEREFORE, for good and valuable consideration, the sufficiency of
which is hereby acknowledged, the parties, intending to be legally bound, agree
as follows:

                                   ARTICLE I
                                  DEFINITIONS.

     For the purpose of this Agreement the following terms shall have the
following meanings:

     1.01  "Action" means any demand, action, suit, counter-suit, arbitration,
inquiry, proceeding or investigation by or before any federal, state, local,
foreign or international Governmental Authority or any arbitration or mediation
tribunal.

     1.02  "Affiliate" of any Person means a Person that controls, is controlled
by, or is under common control with such Person. As used herein, "control" means
the possession, directly or indirectly, of the power to direct or cause the
direction of the management and policies of such entity, whether through
ownership of voting securities or other interests, by contract or otherwise.

     1.03  "Agreement" means this Inter-Company Service Agreement, including all
of the Exhibits and Schedules hereto.

     1.04  "IFX Group" means IFX and each Person (other than any member of the
Tutopia Group) that is an Affiliate of IFX on the date hereof

     1.05  "IFX Indemnitees" has the meaning set forth in Section 5.01

     1.06  "Indemnifying Party" has the meaning set forth in Section 5.03(a)

     1.07  "Indemnitee" has the meaning set forth in Section 5.03

     1.08  "Indemnity Payment" has the meaning set forth in Section 5.03(a)

     1.09  "Confidential Information" means any information disclosed and/or to
which any of the parties may have access, which is or should be reasonably
understood to be confidential or proprietary to either Party, including, but not
limited to, information concerning each party's business, products, services,
content, finances, subscribers, source code, product designs and plans, customer
lists and other marketing and technical information and other unpublished
information

     1.10  "Insurance Policies" means the insurance policies written by
insurance carriers unaffiliated with IFX pursuant to which members of the
Tutopia Group (or their respective officers or directors) will be insured
parties after the date hereof

     1.11  "Insurance Proceeds" means those monies:

           (a)  received by an insured from an insurance carrier; or

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           (b)  paid by an insurance carrier on behalf of the insured; in any
                such case net of any applicable premium adjustments (including
                reserves and retrospectively rated premium adjustments) and net
                of any costs or expenses incurred in the collection thereof

     1.12  "Liabilities" means any and all losses, claims, charges, debts,
demands, actions, causes of action, suits, damages, obligations, payments, costs
and expenses, sums of money, accounts, reckonings, bonds, specialties,
indemnities and similar obligations, exonerations, covenants, contracts,
controversies, agreements, promises, doings, omissions, variances, guarantees,
make whole agreements and similar obligations, and other liabilities, including
all contractual obligations, whether absolute or contingent, matured or
unmatured, liquidated or unliquidated, accrued or unaccrued, known or unknown,
whenever arising, and including those arising under any law, rule, regulation,
Action, threatened or contemplated Action (including the costs and expenses of
demands, assessments, judgments, settlements and compromises relating thereto
and attorneys' fees and any and all costs and expenses (including allocated
costs of in-house counsel and other personnel), whatsoever reasonably incurred
in investigating, preparing or defending against any such Actions or threatened
or contemplated Actions), order or consent decree of any Governmental Authority
or any award of any arbitrator or mediator of any kind, and those arising under
any contract, commitment or undertaking, including those arising under this
Agreement, whether or not recorded or reflected or required to be recorded or
reflected on the books and records or financial statements of any Person.

     1.13  "Governmental Authority" shall mean a court, arbitral tribunal,
administrative agency or commission or other governmental or other regulatory
authority or agency.

     1.14  "Tutopia Group" means Tutopia, each Subsidiary of Tutopia and each
other Person that is either controlled directly or indirectly by Tutopia on the
date hereof.

     1.15  "Tutopia Indemnitees" has the meaning set forth in Section 6.03(a).

     1.16  "Person" means an individual, a general or limited partnership, a
corporation, a trust, a joint venture, an unincorporated organization, a limited
liability entity, any other entity and any Governmental Authority.

     1.17  "Subsidiary of any Person" means any corporation or other
organization whether incorporated or unincorporated of which at least a majority
of the securities or interests having by the terms thereof ordinary voting power
to elect at least a majority of the board of directors or others performing
similar functions with respect to such corporation or other organization is
directly or indirectly owned or controlled by such Person or by any one or more
of its Subsidiaries, or by such Person and one or more of its Subsidiaries;
provided, however, that no Person shall be deemed to be a Subsidiary of such
other Person unless such other Person controls, or has the right, power or
ability to control, that Person.

     1.18  "Third Party Claim" has the meaning set forth in Section 5.04(a).

                                  ARTICLE II
                             TERM AND TERMINATION

     2.01  This Agreement shall commence on the date set forth above and unless
earlier terminated pursuant to paragraph 2.02 or 2.03 of this Article, shall
continue for one year.  Upon termination, all rights and obligations of each
party hereto shall cease as of the date of termination and any amounts owed by
either party hereto shall be paid in full.

     2.02  This Agreement shall also terminate effective immediately upon the
earlier to occur of:

           (a)  The dissolution, termination or liquidation of IFX or Tutopia;

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            (b)  The appointment of a trustee in bankruptcy for IFX or Tutopia,
                 an assignment of assets for the benefit of IFX's or Tutopia's
                 creditors or the adjudication of bankruptcy with respect to IFX
                 or Tutopia; or

            (c)  Either party providing sixty (60)-days written notice of its
                 intent to terminate the Agreement.

     2.03  In the event that either party hereto shall commit any material
breach of or default under this Agreement and such breach or default is not
cured within thirty (30) calendar days after notice of such breach or default
(if remediable), the non-defaulting or non-breaching party shall have the right
(but not the obligation), in addition to all other legal and equitable remedies
that may be available to such party, to terminate this Agreement.

                                  ARTICLE III
    OFFICE SPACE, OFFICE FURNITURE AND OFFICE SERVICES ("Shared Premises")

     3.01  IFX shall provide Tutopia and its employees use of office space,
office furniture and related office services such as utilities,
telecommunications equipment (including, but not limited to the costs of
installment and maintenance of lines, office units and an estimated amount for
actual calls), dedicated local area network internet access, general office
supplies, mailroom services, cleaning services, receptionist services,
maintenance services and general office equipment (e.g., photocopiers, printers
and telefax machines). The above list is not meant to be all-inclusive.

     3.02  With respect to Section 3.01, IFX shall provide Tutopia an itemized
quarterly invoice, which Tutopia shall pay no later than thirty (30) calendar
days after receipt of such invoice, less any disputed amounts. To the extent
possible, IFX will specifically identify direct costs incurred by IFX on behalf
of Tutopia. Indirect costs incurred by IFX and attributable to Tutopia will be
allocated to Tutopia based on the number of employees dedicated to Tutopia
matters verses the total number of employees of IFX. Charges for the shared
premises shall be billed based on the rate schedule set forth in Exhibit A. The
parties shall negotiate in good faith to resolve all disputed amounts.

     3.03  Tutopia shall provide IFX at least fifteen (15) calendar days notice
of its need for office space for new employee.

                                  ARTICLE IV
                         SUPPORT SERVICES ("Services")

     4.01  IFX shall provide Tutopia, at Tutopia's request: administration
(including, but not limited to marketing, financial management, sales efforts,
human resources, accounting, legal, etc.), Internet/telecom and certain
technical support services. IFX shall also provide other similar administrative
and operational services required to carry out Tutopia's business plan that IFX
has the resources to provide without unreasonable cost or burden to its own
operations. The above list is not meant to be all-inclusive.

     4.02  Tutopia shall pay IFX for all out-of-pocket expenses to third parties
incurred in connection with the Services. Those expenses shall include actual
charges for telecommunications calls, special postage, courier service, and any
other similar products or services provided by third parties which are
individually billed to IFX and which are not included in its general charges
specified above. If V.A.T., use or similar taxes are at any time to be required
to be paid on the Services, they will be added to the amounts payable by Tutopia
pursuant to this Agreement.

     4.03  With respect to Sections 4.01 and 4.02, IFX shall provide Tutopia an
itemized quarterly invoice, which Tutopia shall pay no later than thirty (30)
calendar days after receipt of such invoice, less any disputed amounts. To the
extent possible, IFX will specifically identify direct costs (including employee
salaries, bonuses, taxes and benefits) incurred by IFX on behalf of Tutopia
based on a

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reasonable estimate of the percentage of time dedicated by each employee to
Tutopia matters versus the total time dedicated by such employee to Tutopia and
IFX matters. Travel expenses, costs related to Tutopia marketing materials, and
the cost of equipment acquired by IFX specifically on behalf of Tutopia will be
separately itemized. The parties shall negotiate in good faith to resolve all
disputed amounts.

     4.04  The persons listed on Exhibit B hereto are employees of IFX but have
been working full time on behalf of Tutopia. After the date hereof but on or
prior to the Initial Closing, such persons will be transferred to Tutopia's
payroll and become direct employees of Tutopia or its subsidiaries. All costs
associated with such employees incurred on or prior to the Initial Closing,
including salary, payroll taxes, benefits and similar costs paid or liabilities
incurred by Tutopia or by IFX on behalf of Tutopia will become liabilities of
Tutopia, provided, that such liabilities shall constitute "Funded Indebtedness"
for purposes of Section 5(l) of the Tutopia.com, Inc. Stock Purchase Agreement
and subject to the limitations set forth therein.

                                   ARTICLE V
                                INDEMNIFICATION

     5.01  INDEMNIFICATION BY TUTOPIA. Except as provided in Section 5.04,
Tutopia shall indemnify, defend and hold harmless IFX, each member of the IFX
Group and each of their respective directors, officers and employees (in each
case, in their respective capacities as such), and each of the heirs, executors,
successors and assigns of any of the foregoing (collectively, the "IFX
Indemnitees"), from and against any and all Liabilities of the IFX Indemnitees
relating to, arising out of or resulting from any of the following items
(without duplication):

           (a)  The failure of Tutopia or any other member of the Tutopia Group
                or any other Person to pay, perform or otherwise promptly
                discharge any liabilities of Tutopia in accordance with their
                respective terms, whether prior to or after the date hereof; and

           (b)  Any breach by Tutopia or any member of the Tutopia Group of this
                Agreement; provided, however, that Tutopia shall not be
                financially responsible hereunder for any special, incidental,
                consequential or other similar type of damage to the extent that
                such damages are specifically excluded in such agreement.

     5.02  INDEMNIFICATION BY IFX. Except as otherwise provided in Section 5.04,
IFX shall indemnify, defend and hold harmless Tutopia, each member of the
Tutopia Group and each of their respective directors, officers and employees (in
each case, in their respective capacities as such), and each of the heirs,
executors, successors and assigns of any of the foregoing (collectively, the
"Tutopia Indemnitees"), from and against any and all Liabilities of the Tutopia
Indemnitees relating to, arising out of or resulting from any of the following
items (without duplication):

           (a)  The failure of IFX or any other member of the IFX Group or any
                other Person to pay, perform or otherwise promptly discharge any
                Liabilities of the IFX Group, whether prior to or after the date
                hereof; and

           (b)  Any breach by IFX or any member of the IFX Group of this
                Agreement; provided, however, that IFX shall not be financially
                responsible hereunder for any special, incidental, consequential
                or other similar type of damage to the extent that such damages
                are specifically excluded in such agreement.

     5.03  INDEMNIFICATION OBLIGATIONS NET OF INSURANCE PROCEEDS AND OTHER
AMOUNTS.

           (a)  The parties intend that any Liability subject to indemnification
                or reimbursement pursuant to this Article V or Article VI will
                be net of Insurance Proceeds that

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                actually reduce the amount of the Liability. Accordingly, the
                amount which any party (an "Indemnifying Party") is required to
                pay to any Person entitled to indemnification hereunder (an
                "Indemnitee") will be reduced by any Insurance Proceeds
                theretofore actually recovered by or on behalf of the Indemnitee
                in reduction of the related Liability. If an Indemnitee receives
                a payment (an "Indemnity Payment") required by this Agreement
                from an Indemnifying Party in respect of any Liability and
                subsequently receives Insurance Proceeds, then the Indemnitee
                will pay to the Indemnifying Party an amount equal to the excess
                of the Indemnity Payment received over the amount of the
                Indemnity Payment that would have been due if the Insurance
                Proceeds had been received, realized or recovered before the
                Indemnity Payment was made.

           (b)  An insurer who would otherwise be obligated to pay any claim
                shall not be relieved of the responsibility with respect thereto
                or, solely by virtue of the indemnification provisions hereof,
                have any subrogation rights with respect thereto, it being
                expressly understood and agreed that no insurer or any other
                third party shall be entitled to a "windfall" (i.e., a benefit
                they would not be entitled to receive in the absence of the
                indemnification provisions) by virtue of the indemnification
                provisions hereof. Nothing contained in this Agreement shall
                obligate any member of any Group to seek to collect or recover
                any Insurance Proceeds.

     5.04  PROCEDURES FOR INDEMNIFICATION OF THIRD PARTY CLAIMS.

           (a)  If an Indemnitee shall receive notice or otherwise learn of the
                assertion by a Person (including any Governmental Authority) who
                is not a member of the IFX Group or the Tutopia Group of any
                claim or of the commencement by any such Person of any Action
                (collectively, a "Third Party Claim") with respect to which an
                Indemnifying Party may be obligated to provide indemnification
                to such Indemnitee pursuant to Section 5.02 or 5.03, or any
                other Section of this Agreement such Indemnitee shall give such
                Indemnifying Party written notice thereof within twenty (20)
                days after becoming aware of such Third Party Claim. Any such
                notice shall describe the Third Party Claim in reasonable
                detail. Notwithstanding the foregoing, the failure of any
                Indemnitee or other Person to give notice as provided in this
                Section 5.05(a) shall not relieve the related Indemnifying Party
                of its obligations under this Article VI, except to the extent
                that such Indemnifying Party is actually prejudiced by such
                failure to give notice.

           (b)  An Indemnifying Party may elect to defend (and, unless the
                Indemnifying Party has specified any reservations or exceptions,
                to seek to settle or compromise), at such Indemnifying Party's
                own expense and by such Indemnifying Party's own counsel, any
                Third Party Claim. Within thirty (30) days after the receipt of
                notice from an Indemnitee in accordance with Section 3.05(a) (or
                sooner, if the nature of such Third Party Claim so requires),
                the Indemnifying Party shall notify the Indemnitee of its
                election whether the Indemnifying Party will assume
                responsibility for defending such Third Party Claim, which
                election shall specify any reservations or exceptions. After
                notice from an Indemnifying Party to an Indemnitee of its
                election to assume the defense of a Third Party Claim, such
                Indemnitee shall have the right to employ separate counsel and
                to participate in (but not control) the defense, compromise, or
                settlement thereof, but the fees and expenses of such counsel
                shall be the expense of such Indemnitee except as set forth in
                the next sentence. In the event that the Indemnifying Party has
                elected to assume the defense of the Third Party Claim but has
                specified, and continues to assert, any reservations or
                exceptions in such notice, then, in any such case, the
                reasonable fees and expenses of one separate counsel for all
                Indemnitees shall be borne by the Indemnifying Party.

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     (c)  If an Indemnifying Party elects not to assume responsibility for
          defending a Third Party Claim, or fails to notify an Indemnitee of its
          election as provided in Section 5.05(b), such Indemnitee may defend
          such Third Party Claim at the cost and expense of the Indemnifying
          Party.

     (d)  Unless the Indemnifying Party has failed to assume the defense of the
          Third Party Claim in accordance with the terms of this Agreement, no
          Indemnitee may settle or compromise any Third Party Claim without the
          consent of the Indemnifying Party, which consent shall not be
          unreasonably withheld or delayed.

     (e)  No Indemnifying Party shall consent to entry of any judgment or enter
          into any settlement of the Third Party Claim without the consent of
          the Indemnitee if the effect thereof is to permit any injunction,
          declaratory judgment, other order or other nonmonetary relief to be
          entered, directly or indirectly, against any Indemnitee.

     (f)  The provisions of Section 5.05 and Section 5.06 shall not apply to
          Taxes.

5.05  ADDITIONAL MATTERS.

     (a)  Any claim on account of a Liability which does not result from a Third
          Party Claim shall be asserted by written notice given by the
          Indemnitee to the related Indemnifying Party. Such Indemnifying Party
          shall have a period of thirty (30) days after the receipt of such
          notice within which to respond thereto. If such Indemnifying Party
          does not respond within such thirty (30) day period, such Indemnifying
          Party shall be deemed to have refused to accept responsibility to make
          payment. If such Indemnifying Party does not respond within such
          thirty (30) day period or rejects such claim in whole or in part, such
          Indemnitee shall be free to pursue such remedies as may be available
          to such party as contemplated by this Agreement.

     (b)  In the event of payment by or on behalf of any Indemnifying Party to
          any Indemnitee in connection with any Third Party Claim, such
          Indemnifying Party shall be subrogated to and shall stand in the place
          of such Indemnitee as to any events or circumstances in respect of
          which such Indemnitee may have any right, defense or claim relating to
          such Third Party Claim against any claimant or plaintiff asserting
          such Third Party Claim or against any other person. Such Indemnitee
          shall cooperate with such Indemnifying Party in a reasonable manner,
          and at the cost and expense (including allocated costs of in-house
          counsel and other personnel) of such Indemnifying Party, in
          prosecuting any subrogated right, defense or claim.

     (c)  In the event of an Action in which the Indemnifying Party is not a
          named defendant, if the Indemnifying Party shall so request, the
          parties shall endeavor to substitute the Indemnifying Party for the
          named defendant if at all practicable. If such substitution or
          addition cannot be achieved for any reason or is not requested, the
          named defendant shall allow the Indemnifying Party to manage the
          Action as set forth in this Section and the Indemnifying Party shall
          fully indemnify the named defendant against all costs of defending the
          Action (including court costs, sanctions imposed by a court,
          attorneys' fees, experts' fees and all other external expenses), the
          costs of any judgment or settlement, and the cost of any interest or
          penalties relating to any judgment or settlement.

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     5.06  SURVIVAL OF INDEMNITIES.  The rights and obligations of each of IFX
and Tutopia and their respective Indemnitees under this Article V shall survive
the sale or other transfer by any party of any Assets or businesses or the
assignment by it of any Liabilities.

     5.07  UNAVAILABILITY OF INDEMNITY.  If the indemnification provided for in
this Article V is held by a court of competent jurisdiction to be unavailable to
an indemnified party with respect to any Liabilities referred to herein, the
indemnifying party, in lieu of indemnifying such indemnified party hereunder,
agrees to contribute to the amount paid or payable by such indemnified party as
a result of such Liability in such proportion as is appropriate to reflect the
relative fault of the indemnifying party on one hand and of the indemnified
party on the other in connection with the event that resulted in such Liability,
as well as any other relevant equitable considerations.

                                  ARTICLE VI
                               INSURANCE MATTERS

     6.01  Tutopia and IFX agree that Tutopia may remain on IFX's insurance
policies relating to Directors and Officers, property, errors and omissions,
professional liability, worker's compensation, office content and general
liability until the earlier of such time as Tutopia no longer qualifies for
coverage on the respective IFX Insurance Policy or, upon thirty (30) days' prior
written notice to IFX, Tutopia elects to be removed from the IFX Insurance
Policy or Policies. For so long as Tutopia is covered by IFX's Insurance
Policies, Tutopia shall pay to IFX on a quarterly calendar basis (prorated on a
daily basis for any partial month), no later than thirty (30) days after the end
of each respective quarter, in respect of the period from the date hereof until
the termination of Tutopia's coverage on all of IFX's Insurance Policies, in
respect of Insurance Policies under which Tutopia shall continue to have
coverage following the date hereof. IFX and Tutopia agree to cooperate in good
faith to provide for the treatment of any Insurance Policies that shall remain
in effect following the date hereof on a mutually agreeable basis. IFX shall
provide Tutopia with prompt notice in the event that any Insurance Policy shall
be terminated or otherwise cease to be in effect for any reason, provided that
IFX shall provide Tutopia with reasonable notice prior to taking any action to
terminate or reduce the scope of insurance. In no event shall IFX, any other
member of the IFX Group or any IFX Indemnitee have liability or obligation
whatsoever to any member of the Tutopia Group in the event (i) that any
Insurance Policy or other contract or policy of insurance shall be terminated or
otherwise cease to be in effect for any reason, shall be unavailable or
inadequate to cover any Liability of any member of the Tutopia Group for any
reason whatsoever or shall not be renewed or extended beyond the current
expiration date; or (ii) notwithstanding the provisions of the immediately
preceding sentence, that IFX fails to provide Tutopia with notice of any such
event.

     6.02  (a)  The parties intend by this Agreement that Tutopia and each other
member of the Tutopia Group be successors-in-interest to all rights that any
member of the Tutopia Group may have as of the date hereof as a subsidiary,
affiliate, division or department of IFX prior to the date hereof under any
policy of insurance issued to IFX by any insurance carrier unaffiliated with IFX
or under any agreements related to such policies executed and delivered prior to
the date hereof, including any rights such member of the Tutopia Group may have,
as an insured or additional named insured, subsidiary, affiliate, division or
department, to avail itself of any such policy of insurance or any such
agreements related to such policies as in effect prior to the date hereof. At
the request of Tutopia, IFX shall take all reasonable steps, including the
execution and delivery of any instruments, to effect the foregoing; provided,
however that IFX shall not be required to pay any amounts, waive any rights or
incur any Liabilities in connection therewith.

           (b)  after the date hereof, none of IFX or Tutopia or any member of
                their respective Groups shall, without the consent of the other,
                provide any such insurance carrier with a release, or amend,
                modify or waive any rights under any such policy or agreement,
                if such release, amendment, modification or waiver would
                adversely affect any rights or potential rights of any member of
                the other Group thereunder; provided however that the foregoing
                shall not (A) preclude any member of any Group from presenting
                any claim or from exhausting any policy limit, (B) require any
                member of any Group to pay any premium or other amount or to
                incur any

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                Liability, or (C) require any member of any Group to renew,
                extend or continue any policy in force. Each of Tutopia and IFX
                will share such information as is reasonably necessary in order
                to permit the other to manage and conduct its insurance matters
                in an orderly fashion

     6.03  This Agreement shall not be considered as an attempted assignment of
any policy of insurance or as a contract of insurance and shall not be construed
to waive any right or remedy of any member of the IFX Group in respect of any
Insurance Policy or any other contract or policy of insurance.

     6.04  Tutopia does hereby, for itself and each other member of the Tutopia
Group, agree that no member of the IFX Group or any IFX Indemnitee shall have
any Liability whatsoever as a result of the insurance policies and practices of
IFX and its Affiliates as in effect at any time prior to the date hereof,
including as a result of the level or scope of any such insurance, the
creditworthiness of any insurance carrier, the terms and conditions of any
policy, the adequacy or timeliness of any notice to any insurance carrier with
respect to any claim or potential claim or otherwise.

     6.05  Nothing in this Agreement shall be deemed to restrict any member of
the Tutopia Group from acquiring at its own expense any other insurance policy
in respect of any Liabilities or covering any period.

                                  ARTICLE VII
                   EXCHANGE OF INFORMATION; CONFIDENTIALITY

7.01  AGREEMENT FOR EXCHANGE OF INFORMATION; ARCHIVES.

      (a)  IFX and Tutopia, on behalf of its respective Group, agree to provide,
           or cause to provide, to the other Group, as soon as reasonably
           practicable after written request, any information in the possession
           or under the control of such Group which the requesting party
           reasonably needs (i) to comply with reporting, disclosure, filing or
           other requirements imposed on the requesting party (including under
           applicable securities or tax laws) by a Governmental Authority having
           jurisdiction over the requesting party, (ii) for use in any other
           judicial, regulatory, administrative, tax or other proceeding or in
           order to satisfy audit, accounting, claims, regulatory, litigation,
           tax or other similar requirements, or (iii) to comply with its
           obligations under this Agreement; provided, however, that in the
           event that any party determines that any such provision of
           Information could be commercially detrimental, violate any law or
           agreement, or waive any attorney client privilege, the parties shall
           take all reasonable measures to permit the compliance with such
           obligations in a manner that avoids any such harm or consequence.

      (b)  Tutopia shall have access during regular business hours (as in effect
           from time to time) to the documents and objects of historic
           significance that relate to the business of Tutopia that are located
           in the IFX records to the extent such documents or objects have been
           specifically identified and requested by Tutopia in advance or, if
           specific documents or objects have not been identified, to the extent
           Tutopia has provided IFX with proper advance notice to request such
           access and the Tutopia representative designated to receive such
           access is accompanied by an IFX representative. Tutopia may obtain
           copies (but not originals) of documents for bona fide business
           purposes and may obtain objects for exhibition purposes for
           commercially reasonable periods of time if required for bona fide
           business purposes, provided that Tutopia shall cause any such objects
           to be returned promptly in the same condition in which they were
           delivered to Tutopia and Tutopia shall comply with any rules,
           procedures or other requirements, and shall be subject to any
           restrictions (including prohibitions on removal of specified
           objects), that are then applicable to IFX. Nothing herein

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               shall be deemed to restrict the access of any member of the IFX
               Group to any such documents or objects or to impose any liability
               on any member of the IFX Group if any such documents or objects
               are not maintained or preserved by IFX.

     7.02  OWNERSHIP OF INFORMATION.  Any Information owned by one Group that is
provided to a requesting party pursuant to Section 7.01 shall be deemed to
remain the property of the providing party.  Unless specifically set forth
herein, nothing contained in this Agreement shall be construed as granting or
conferring rights of license or otherwise in any such Information.

     7.03  COMPENSATION FOR PROVIDING INFORMATION. The party requesting such
Information agrees to reimburse the other party for the reasonable costs, if
any, of creating, gathering and copying such Information, to the extent that
such costs are incurred for the benefit of the requesting party. Except as may
be otherwise specifically provided elsewhere in this Agreement or in any other
agreement between the parties, such costs shall be computed in accordance with
the providing party's standard methodology and procedures.

     7.04  RECORD RETENTION. To facilitate the possible exchange of Information
pursuant to this Article VII and other provisions of this Agreement after the
date hereof, the parties agree to use their reasonable best efforts to retain
all Information in their respective possession or control on the date hereof in
accordance with the policies of IFX as in effect on the date hereof. No party
will destroy, or permit any of its Subsidiaries to destroy, any Information
which the other party may have the right to obtain pursuant to this Agreement
without first using its reasonable best efforts to notify the other party of the
proposed destruction and giving the other party the opportunity to take
possession of such information prior to such destruction.

     7.05  LIMITATION OF LIABILITY. No party shall have any liability to any
other party in the event that any Information exchanged or provided pursuant to
this Agreement which is an estimate or forecast, or which is based on an
estimate or forecast, is found to be inaccurate, in the absence of willful
misconduct by the party providing such Information. No party shall have any
liability to any other party if any Information is destroyed after reasonable
best efforts by such party to comply with the provisions of Section 7.04.

     7.06  CONFIDENTIALITY. (a) Subject to Section 7.07, each of IFX and
Tutopia, on behalf of itself and each member of its respective Group, agrees to
hold, and to cause its respective directors, officers, employees, agents,
accountants, counsel and other advisors and representatives to hold, in strict
confidence, with at least the same degree of care that applies to IFX's
confidential and proprietary information pursuant to policies in effect as of
the date hereof, all Confidential Information concerning each such other Group
that is either in its possession (including Confidential Information in its
possession prior to the date hereof) or furnished by any such other Group or its
respective directors, officers, employees, agents, accountants, counsel and
other advisors and representatives at any time pursuant to this Agreement and
shall not use any such Confidential Information other than for such purposes as
shall be expressly permitted hereunder or thereunder, except, in each case, to
the extent that such Confidential Information has been (i) in the public domain
through no fault of such party or any member of such Group or any of their
respective directors, officers, employees, agents, accountants, counsel and
other advisors and representatives, (ii) later lawfully acquired from other
sources by such party (or any member of such party's Group which sources are not
themselves bound by a confidentiality obligation), or (iii) independently
generated without reference to any proprietary or Confidential Information of
the other party.

Each party agrees not to release or disclose, or permit to be released or
disclosed, any such Information to any other Person, except its directors,
officers, employees, agents, accountants, counsel and other advisors and
representatives who need to know such Information (who shall be advised of their
obligations hereunder with respect to such Information), except in compliance
with Section 7.07.  Without limiting the foregoing, when any Information is no
longer needed for the purposes contemplated by this Agreement each party will
promptly after request of the other party either return to the other party all
Information in a tangible form (including all copies thereof and all notes,
extracts or summaries based

Page 9 or 9
IFX Confidential and Proprietary
<PAGE>

                                                                   Exhibit 10.17

thereon) or certify to the other party that it has destroyed such Information
(and such copies thereof and such notes, extracts or summaries based therein).

     7.07 PROTECTIVE ARRANGEMENTS. In the event that any party or any member of
its Group either determines on the advice of its counsel that it is required to
disclose any Information pursuant to applicable law or receives any demand under
lawful process or from any Governmental Authority to disclose or provide
Information of any other party (or any member of any other party's Group) that
is subject to the confidentiality provisions hereof, such party shall notify the
other party prior to disclosing or providing such Information and shall
cooperate at the expense of the requesting party in seeking any reasonable
protective arrangements requested by such other party. Subject to the foregoing,
the Person that received such request may thereafter disclose or provide
Information to the extent required by such law (as so advised by counsel) or by
lawful process or such Governmental Authority.

                                 ARTICLE VIII
                                 MISCELLANEOUS

     8.01  COUNTERPARTS; ENTIRE AGREEMENT; CORPORATE POWER.

           (a)  This Agreement may be executed in one or more counterparts, all
                of which shall be considered one and the same agreement, and
                shall become effective when one or more counterparts have been
                signed by each of the parties and delivered to the other party.

           (b)  This Agreement, and the Exhibits, Schedules and Appendices
                hereto, contain the entire agreement between the parties with
                respect to the subject matter hereof, supersede all previous
                agreements (including the Inter-Company Services Agreement dated
                January 7, 2000, between the parties), negotiations,
                discussions, writings, understandings, commitments and
                conversations with respect to such subject matter and there are
                no agreements or understandings between the parties other than
                those set forth or referred to herein or therein.

           (c)  IFX represents on behalf of itself and each other member of the
                IFX Group and Tutopia represents on behalf of itself and each
                other member of the Tutopia Group as follows:

                (i)  Each such Person has the requisite corporate or other power
                     and authority and has taken all corporate or other action
                     necessary in order to execute, deliver and perform each of
                     this Agreement, to which it is a party and to consummate
                     the transactions contemplated hereby and thereby; and

                (ii) This Agreement to which it is a party has been duly
                     executed and delivered by it and constitutes a valid and
                     binding agreement of it enforceable in accordance with the
                     terms thereof subject to (a) the laws of bankruptcy and
                     laws effecting creditors' rights generally and (b) the
                     availability of equitable remedies.

     8.02  GOVERNING LAW. This Agreement is or, upon execution and delivery
thereof, shall be governed by, and construed in accordance with, the laws of the
State of Florida. The Parties agree to submit themselves to the exclusive
jurisdiction of the courts of the State of Florida or of the United States
District Court for the Southern District of Florida in respect of litigation
arising out of this agreement, waiving all affirmative and legal defenses in
respect of jurisdiction, forum and venue.

     8.03  ASSIGNABILITY.  Neither party hereto or thereto may assign its
respective rights or delegate its respective obligations under this Agreement
without the express prior written consent of the

Page 10 of 10
IFX Confidential and Proprietary
<PAGE>

                                                                   Exhibit 10.17

other parties hereto or thereto; provided, however, that either party hereto may
assign its rights and delegate its responsibilities in connection with a sale or
assignment of all or substantially all of its assets to a single acquiror.

     8.04  THIRD PARTY BENEFICIARIES. Except for the indemnification rights
under this Agreement of any IFX Indemnitee or Tutopia Indemnitee in their
respective capacities as such, (a) the provisions of this Agreement are solely
for the benefit of the parties and are not intended to confer upon any Person
except the parties any rights or remedies hereunder, (b) there are no third
party beneficiaries of this Agreement, and (c) nothing in this Agreement shall
provide any third person with any remedy, claim, liability, reimbursement, claim
of action or other right in excess of those existing without reference to this
Agreement.

     8.05  NOTICES. Except as otherwise permitted herein, any notices or
consents required or permitted under this Agreement shall be made in writing and
delivered in person or by registered or certified mail, postage prepaid, return
receipt requested, or by a reputable courier delivery service, or by facsimile
or e-mail during regular business hours (provided that a confirmation copy
follows by first-class US Mail or another method of delivery permitted under
this Section), as follows unless such address is changed by written notice
hereunder. Such notice shall be deemed given for purposes of this Agreement on
the day that such writing is sent to the intended recipient thereof in
accordance with the provisions of this section:

  If to Tutopia:                               If to IFX:
  Jak Bursztyn                                 Joel Eidelstein
  Tutopia.com, Inc.                            IFX Corporation
  15050 NW 79 Court, Suite 200                 15050 NW 79 Court, Suite 200
  Miami Lakes, Florida 33016                   Miami Lakes, Florida 33016
  Fax:  (305) 512-4220                         Fax: (305) 512-4220
  E-mail: Jack@tutopia.com                     E-mail: JEidelstein@ifxcorp.com

     8.06  SEVERABILITY. If any provision of this Agreement or the application
thereof to any Person or circumstance is determined by a court of competent
jurisdiction to be invalid, void or unenforceable, the remaining provisions
hereof or thereof, or the application of such provision to Persons or
circumstances or in jurisdictions other than those as to which it has been held
invalid or unenforceable, shall remain in full force and effect and shall in no
way be affected, impaired or invalidated thereby, so long as the economic or
legal substance of the transactions contemplated hereby or thereby, as the case
may be, is not affected in any manner adverse to any party. Upon such
determination, the parties shall negotiate in good faith in an effort to agree
upon such a suitable and equitable provision to effect the original intent of
the parties.

     8.07  FORCE MAJEURE. Neither Party shall be liable for any failure or delay
resulting from any acts of God, governmental action, fire, insurrection,
earthquake, power failure, riot, explosion, embargo, strikes, whether legal or
illegal, labor or material shortage, transportation interruption of any kind,
work slowdown or any other condition beyond the control of the Party affecting
production or delivery in any manner. In the event of any such excused delay,
the time for performance shall be extended for a period equal to the time lost
by reason of the delay.

     8.08  HEADINGS. The article, section and paragraph headings contained in
this Agreement are for reference purposes only and shall not affect in any way
the meaning or interpretation of this Agreement.

     8.09  WAIVERS OF DEFAULT. Waiver by any party of any default by the other
party of any provision of this Agreement shall not be deemed a waiver by the
waiving party of any subsequent or other default, nor shall it prejudice the
rights of the other party.

     8.10  AMENDMENTS. No provisions of this Agreement shall be deemed waived,
amended, supplemented or modified by any party, unless such waiver, amendment,
supplement or modification is in

Page 11 of 11
IFX Confidential and Proprietary
<PAGE>

                                                                   Exhibit 10.17

writing and signed by the authorized representative of the party against whom it
is sought to enforce such waiver, amendment, supplement or modification.

     8.11  INTERPRETATION. Words in the singular shall be held to include the
plural and vice versa and words of one gender shall be held to include the other
genders as the context requires. The terms "hereof," "herein," and "herewith"
and words of similar import shall, unless otherwise stated, be construed to
refer to this Agreement as a whole (including all of the Schedules, Exhibits and
Appendices hereto and thereto) and not to any particular provision of this
Agreement. Article, Section, Exhibit, Schedule and Appendix references are to
the Articles, Sections, Exhibits, Schedules and Appendices to this Agreement
unless otherwise specified. The word "including" and words of similar import
when used in this Agreement shall mean "including, without limitation," unless
the context otherwise requires or unless otherwise specified.

     IN WITNESS WHEREOF, the parties have caused this Inter-Company Agreement to
be executed by their duly authorized representatives as of the date first above
written.

For Tutopia.com, Inc.:                    For IFX Corporation:

 /s/ Jak Bursztyn                          /s/ Michael Shalom
-----------------------------------       -------------------------------------
 Signature                                 Signature

 Jak Bursztyn                              Michael Shalom
-----------------------------------       -------------------------------------
 Print Name                                Print Name

 President                                 CEO
-----------------------------------       -------------------------------------
 Title                                     Title

 August 31, 2000                           August 31, 2000
-----------------------------------       -------------------------------------
 Date                                      Date

Page 12 of 12
IFX Confidential and Proprietary<PAGE>

                                                                   Exhibit 10.18

Share Sale Agreement

between

IFX Corporation
as Vendor

and

Duncan Lawrie Offshore Services Limited in its capacity as
trustee for The IFX Group Trust
as Purchaser

relating to

the sale and purchase of the redeemable preference share in
IFX Limited

SIMMONS & SIMMONS

21 Wilson Street London EC2M 2TX
Tel: 020 7628 2020 / 7528 9292 Fax: 020 7628 2070 DX Box No 12

<PAGE>

                                                                   Exhibit 10.18

                                   CONTENTS

 1.  Definitions and Construction................................  1

 2.  Sale of Preference Share....................................  2

 3.  Consideration...............................................  3

 4.  Conditions..................................................  3

 5.  Completion..................................................  3

 6.  Waiver by the Vendor........................................  4

 7.  Warranties and representations..............................  4

 8.  Confidentiality.............................................  5

 9.  Provisions relating to this Agreement.......................  6

10.  Law and Jurisdiction........................................  8

                                       i
<PAGE>

                                                                   Exhibit 10.18

THIS AGREEMENT is dated August 24, 2000 and made

BETWEEN:
--------

(1)  IFX CORPORATION, (the "Vendor"), a corporation incorporated under the laws
     of the State of Delaware and whose registered office is at 707 Skokie
     Boulevard, Northbrook, Illinois 60062; and

(2)  Duncan Lawrie Offshore Services Limited, being a company incorporated in
     the Isle of Man with company number 44074C and registered office at 14-15
     Mount Havelock, Douglas, Isle of Man IM1 2QG in its capacity as trustee of
     THE IFX GROUP TRUST, being a trust constituted under the laws of Jersey
     (the "Purchaser").

Background:

The Vendor wishes to sell and the Purchaser wishes to acquire the single issued
redeemable preference share of US$1 in the Company on the terms of and subject
to such conditions to this Agreement.

THE PARTIES AGREE THAT:
-----------------------

1.   Definitions and Construction
     ----------------------------

1.1  In this Agreement where the context admits:

     "Admission" means admission to the Official List of the UK Listing
     Authority and admission to trading on the London Stock Exchange plc of the
     consideration shares to be allotted to the Purchaser under the Zetters
     Share Sale Agreement becoming effective;

     "Affiliate" means, in relation to a body corporate, any subsidiary or
     holding company of such body corporate, and any subsidiary of any such
     holding company for the time being;

     "Agreed Form" means in relation to any document, a document in the terms
     signed or initialled by or on behalf of the parties for identification;

     "Articles" means the Articles of Association of the Company;

     "Business Day" means a day (other than Saturday or Sunday) on which banks
     are open for ordinary banking business in London;

     "Company" means IFX Limited, a company incorporated in England and Wales
     (registered number 2876284) and whose registered office is at America
     House, 2 America Square, London EC3N 2LU;

     "Completion" means completion of the sale and purchase of the Preference
     Share in accordance with clause 5;

     "Completion Date" means the date upon which Completion takes place;

     "Consideration" means the consideration payable by the Purchaser for the
     Preference Share as set out in clause 3;

     "Deed of Termination and Waiver" means the deed in Agreed Form marked "B"
     attached to this Agreement;

                                       1
<PAGE>

                                                                   Exhibit 10.18

     "Director" means any director or officer of the Vendor or a member of the
     Vendor's Group since 01 January 1994 and "Directors" means each and all of
     them;

     "Encumbrance" includes any interest or equity of any person (including any
     right to acquire, option or right of pre-emption); any mortgage, charge,
     pledge, lien, assignment, hypothecation, security interest (including any
     created by law), title retention or other security agreement or
     arrangement; and any rental, hire purchase, credit sale or other agreement
     for payment on deferred terms;

     "First Share Sale Agreement" means the share sale agreement between the
     Vendor and the Purchaser, dated 30 June 1999 relating to the sale and
     purchase of 2,448,465 ordinary `A' shares in the Company;

     "Preference Share" means the single issued redeemable preference share of
     US$1 in the Company to be bought and sold pursuant to clause 2 of this
     Agreement;

     "Purchaser's Solicitors" means Simmons & Simmons of 21 Wilson Street,
     London EC2M 2TX;

     "Vendor's Attorneys" means Neal, Gerber & Eisenberg, Suite 2200, 2 N. La
     Salle Street, Chicago, Illinois 60602;

     "Vendor's Group" means the Vendor and each of its Affiliates from time to
     time;

     "Warranties" means the warranties and representations set out in clause 7;

     "Zetters Share Sale Agreement" means an agreement to be entered into
     between the Purchaser, other parties and Zetters Group plc (a company
     incorporated in England and Wales under registered number 853270 with its
     registered office at 86-88 Clerkenwell Road, London EC1P 12S) relating to
     the proposed sale and purchase of 4,896,929 ordinary shares of US$1 and a
     single redeemable preference share of US$1 in the share capital of the
     Company, where the total consideration payable to the Purchaser comprises:-

     (a)  8,717,949 ordinary shares in Zetters;

     (b)  (Pounds)3.9 million in cash; and

     (c)  the sterling equivalent of $469,406; and

     "Zetters Solicitors" means Herbert Smith of Exchange House, Primrose
     Street, London EC2A 2HS.

1.2  The headings and sub-headings and any contents pages are inserted for
     convenience only and shall not affect the construction of this Agreement.

2.   Sale of Preference Share

     Subject to the terms of this Agreement, the Vendor shall sell with full
     title guarantee and the Purchaser shall purchase, free from all
     Encumbrances and together with all rights now or hereafter attaching to the
     Preference Share including, for the avoidance of doubt, the dividend
     payable by the Company in respect of the Preference Share for the three
     months period ending on 30 September 2000.

                                       2
<PAGE>

                                                                   Exhibit 10.18

3.   Consideration

     The Consideration payable by the Purchaser to the Vendor for the Preference
     Share shall be the sum of US$2,400,000.

4.   Conditions

     Completion of the sale and purchase of the Preference Share is subject to
     the full and complete satisfaction of each and all of the conditions to
     completion set out in the Zetters Share Sale Agreement, save for any
     condition relating to the due and complete satisfaction of the conditions
     to this Agreement and any condition relating to Admission becoming
     effective.

5.   Completion

5.1  Date and place of Completion

     Completion shall take place at the offices of Simmons & Simmons, 21 Wilson
     Street, London EC2M 2TX on the date of completion of the Zetters Share Sale
     Agreement.

5.2  Vendor's obligations

     By no later than the day prior to the date of Completion the Vendor shall
     deliver or cause to be delivered to the Purchaser's Solicitors (all such
     documents to be held to the order of the Vendor's Attorney pending
     Completion):

     (A)  a signed class resolution evidencing the Vendor's consent to any
          variation of the rights attaching to the Preference Share by reason of
          the proposed resolution in the Agreed Form marked `A', to amend the
          Articles to delete Article 3.1(B)(v) of the Articles and replace it
          with the following:

               "(v) Transfers

                    The redeemable preference share shall be freely
                    transferable";

     (B)  (1)  a transfer of the Preference Share duly executed by the Vendor in
               favour of the Purchaser together with the relative share
               certificate;

          (2)  such waivers or consents as the Purchaser may reasonably require
               to enable the Purchaser to be registered as holder of the
               Preference Share;

          (3)  a duly executed Deed of Termination and Waiver effective on the
               Completion Date agreeing to the termination and waiver of any
               outstanding obligations and rights respectively, under the First
               Share Sale Agreement, including for the avoidance of doubt, the
               rights of the Vendor to additional consideration payments in the
               event of a Park Trust Adjustment Event (as defined therein) and
               rights of indemnification as provided for in section 1.4 of
               Article I and section 3.9 of Article III respectively thereof and
               any outstanding obligations and liabilities the Company may have
               to the Vendor, in Agreed Form marked `B'.

5.3  Purchaser's obligations

     By no later than the day prior to the date of Completion the Purchaser
     shall:-

                                       3
<PAGE>

                                                                   Exhibit 10.18

(A)  deliver or cause to be delivered to the Vendor's Attorneys to be held to
     the order of the Purchaser's Solicitors a signed written shareholder
     resolution of the Company, in the Agreed Form marked `C';

(B)  deliver or cause to be delivered to the Vendor's Attorneys to be held to
     the order of the Purchaser's Solicitors a duly executed Deed of Termination
     and Waiver effective as at the Completion Date agreeing to the termination
     and waiver of any outstanding obligations and rights respectively, in
     Agreed Form marked "B"; and

(C)  pay or cause to be paid to the Vendor's Attorneys to be held to the order
     of Zetter's Solicitors the Consideration for the Preference Share as
     provided by clause 3 and in accordance with the payment provisions in
     clause 9.7.

5.4  Completion

     Completion shall take place upon Admission whereupon:-

     (A)  all documents delivered to the Purchaser's Solicitors pursuant to
          clause 5.2 shall cease to be held to the order of the Vendor's
          Attorneys; and

     (B)  the documents delivered to the Vendor's Attorney pursuant to sub-
          clause 5.3(B) and the payment made to the Vendor's Attorney pursuant
          to sub-clause 5.3(C) shall cease to be held to the order of the
          Purchaser's Solicitors and Zetters' Solicitors respectively.

5.5  Failure to complete

     If Completion does not take place on or before 31 October 2000, the
     provisions of this Agreement shall have no effect and no party shall have
     any rights or liabilities under them (without prejudice to the rights of
     any of the parties in respect of antecedent breaches).

6.   Waiver by the Vendor

     The Vendor waives any rights to any additional consideration payments under
     the First Share Sale Agreement arising from the occurrence of a Park Trust
     Adjustment Event (as defined in the First Share Sale Agreement) by reason
     of the Purchaser entering into the Zetters Share Sale Agreement.

7.   Warranties and representations

7.1  The Vendor hereby warrants and represents to and for the benefit of the
     Purchaser that:

     (A)  The Vendor has full power and authority to enter into and perform this
          Agreement, and may execute and deliver this Agreement and perform its
          obligations under this Agreement and this Agreement constitutes valid
          and binding obligations of the Vendor in accordance with its terms.

     (B)  The Vendor is the registered and sole beneficial owner of the
          Preference Share free from any Encumbrances.

     (C)  There is not outstanding any indebtedness or other liability (actual
          or contingent) owing by the Company to the Vendor or any member of the
          Vendor's Group or to any Director or any person connected with any of
          them, nor is there any indebtedness owing to the Company by any such
          person.

7.2  The Purchaser hereby warrants and represents to and for the benefit of the
     Vendor that it has full power and authority to enter into and perform this
     Agreement, and may execute

                                       4
<PAGE>

                                                                   Exhibit 10.18

     and deliver this Agreement and perform its obligations under this Agreement
     and this Agreement constitutes valid and binding obligations of the
     Purchaser in accordance with its terms.

8.   Confidentiality
     ---------------

8.1  Confidentiality

     Each party:-

     (A)  shall treat as strictly confidential the provisions of this Agreement
          and the terms of the Zetters Share Sale Agreement as disclosed by the
          Purchaser to the Vendor and the process of their negotiation and all
          information about any other party obtained or received by it as a
          result of negotiating, entering into or performing its obligations
          under this Agreement ("Confidential Information"); and

     (B)  shall not, except with the prior written consent of each other party
          (which shall not be unreasonably withheld or delayed), publish or
          otherwise disclose to any person any Confidential Information.

8.2  Permitted disclosures

     Clause 8.1 shall not apply if and to the extent that the party disclosing
     Confidential Information can demonstrate that:

     (A)  such disclosure is required by law or by any securities exchange or
          regulatory or governmental body having jurisdiction over it (including
          but not limited to the London Stock Exchange plc, the Panel on
          Takeovers and Mergers and the Serious Fraud Office) and whether or not
          the requirement has the force of law; or

     (B)  such disclosure is to its professional advisers in relation to the
          negotiation, entry into or performance of this Agreement or any matter
          arising out of the same or, where the disclosing party is the
          Purchaser, is of information necessarily or reasonably disclosed to
          any person concerned with any transaction for financing the purchase
          of the Preference Share or the granting of security over the same or
          over the benefit of this Agreement, any other transaction dependent
          upon or relating to such purchase or any transaction involving the
          sale or other disposal of the Preference Share or the whole or any
          part of the issued share capital of the Company; or

     (C)  such disclosure is required to facilitate the satisfaction of any of
          the Conditions; or

     (D)  such disclosure is required in order to facilitate any assignment or
          proposed assignment of the whole or any part of the rights or benefits
          under this Agreement which is permitted by clause 9.1; or

     (E)  the Confidential Information concerned was lawfully in its possession
          (as evidenced by written records) prior to its being obtained or
          received as described in clause 8.1(A); or

     (F)  the Confidential Information concerned has come into the public domain
          other than through its fault or the fault of any person to whom such
          Confidential Information has been disclosed in accordance with clause
          8.1(B).

                                       5
<PAGE>

                                                                   Exhibit 10.18

8.3  Continuance of restrictions

     The restrictions contained in this clause 8 shall survive Completion and
     shall continue without limit of time.

9.   Provisions relating to this Agreement
     -------------------------------------

9.1  Assignment

     (A)  This Agreement shall be binding upon and enure for the benefit of the
          successors of the parties but shall not be assignable, save that the
          Purchaser may at any time assign all or any part of its rights and
          benefits under this Agreement and any agreement referred to herein,
          including, without limitation, any of the Warranties, to any
          transferee of the share capital of the Company or to any Affiliate of
          the Purchaser.

     (B)  Any such assignee may enforce any right or benefit assigned to it as
          if it had been named in this Agreement as the Purchaser, and may
          recover thereunder as if it had acquired the Preference Share for the
          consideration and upon the other terms of this Agreement and had
          thereby sustained all diminutions of value, losses and expenses in
          consequence of such acquisition as have been sustained by the
          Purchaser and any subsequent holder of such share capital, including
          itself, as if they were all one entity which had retained the
          ownership of such issued share capital throughout.

9.2  Whole agreement and variations

     (A)  This Agreement, together with any documents referred to in it
          (including for the avoidance of doubt the Deed of Termination and
          Waiver), constitutes the whole agreement between the parties relating
          to its subject matter and supersedes and extinguishes any prior
          drafts, agreements, and undertakings, whether in writing or oral,
          relating to such subject matter, except to the extent that the same
          are repeated in this Agreement.

     (B)  Each party acknowledges that it has not been induced to enter into
          this Agreement by any representation, warranty, promise or assurance
          save for those contained in this Agreement.

     (C)  No variation of this Agreement shall be effective unless made in
          writing and signed by each of the parties.

9.3  Agreement survives Completion

     The Warranties and all other provisions of this Agreement, in so far as the
     same shall not have been performed at Completion, shall remain in full
     force and effect notwithstanding Completion.

9.4  Rights etc cumulative and other matters

     (A)  The rights, powers, privileges and remedies provided in this Agreement
          are cumulative and are not exclusive of any rights, powers, privileges
          or remedies provided by law or otherwise.

     (B)  No failure to exercise nor any delay in exercising any right, power,
          privilege or remedy under this Agreement shall in any way impair or
          affect the exercise thereof or operate as a waiver thereof in whole or
          in part.

                                       6
<PAGE>

                                                                   Exhibit 10.18

      (C)  No single or partial exercise of any right, power, privilege or
           remedy under this Agreement shall prevent any further or other
           exercise thereof or the exercise of any other right, power, privilege
           or remedy.

9.5   Further assurance

      At any time after Completion the Vendor shall, at the request and cost of
      the Purchaser, execute or procure the execution of such documents and do
      or procure the doing of such acts and things as the Purchaser may
      reasonably require for the purpose of vesting the Preference Share in the
      Purchaser or its nominees and giving to the Purchaser the full benefit of
      all the provisions of this Agreement.

9.6   Invalidity

      If any provision of this Agreement shall be held to be illegal, void,
      invalid or unenforceable under the laws of any jurisdiction, the legality,
      validity and enforceability of the remainder of this Agreement in that
      jurisdiction shall not be affected, and the legality, validity and
      enforceability of the whole of this Agreement in any other jurisdiction
      shall not be affected.

9.7   Payment to the Vendor

      Any payment falling to be made to the Vendor under any provision of this
      Agreement may be made by telegraphic transfer to the account of the
      Vendor's Attorneys, account no: 0980023788 account name: Neal Gerber &
      Eisenberg Client Funds, ABA no.: 271070801, reference: IFX Corporation.

9.8   Counterparts

      This Agreement may be executed in any number of counterparts, which shall
      together constitute one Agreement. Any party may enter into this Agreement
      by signing any such counterpart.

9.9   Costs

      Subject to clause 9.5, each party shall bear its own costs arising out of
      or in connection with the preparation, negotiation and implementation of
      this Agreement.

9.10  Notices

      (A)  Any notice or other communication required to be given under this
           Agreement or in connection with the matters contemplated by it shall,
           except where otherwise specifically provided, be in writing in the
           English language and shall be addressed as provided in clause 9.10(B)
           and may be:

           (1)  personally delivered, in which case it shall be deemed to have
                been given upon delivery at the relevant address; or

           (2)  if within the United Kingdom, sent by first class pre-paid post,
                in which case it shall be deemed to have been given two Business
                Days after the date of posting; or

           (3)  if from or to any place outside the United Kingdom, sent by pre-
                paid priority airmail, in which case it shall be deemed to have
                been given seven Business Days after the date of posting; or

           (4)  sent by fax, in which case it shall be deemed to have been given
                when despatched, subject to confirmation of uninterrupted
                transmission by a

                                       7
<PAGE>

                                                                   Exhibit 10.18

                transmission report, provided that any notice despatched by fax
                after 17.00 hours (at the place where such fax is to be
                received) on any day shall be deemed to have been received at
                08.00 on the next Business Day.

      (B)  The addresses and other details of the parties referred to in clause
           9.10(A) are, subject to clause 9.10 (e):

           Name:                  IFX Corporation

           Address:               707 Skokie Boulevard

                                  5th Floor

                                  Northbrook

                                  Illinois 60062

           Fax number:            +1 305 574 7867

           Name:                  The IFX Group Trust

           For the attention of:  Mr Shaun Ridings

           Address:               c/o Duncan Lawrie Offshore Services Limited

                                  14/15 Mount Havelock

                                  Douglas

                                  Isle of Man

           Fax number:            + 44 1624 662 878

      Any party to this Agreement may notify the other parties of any change to
      its address or other details specified in clause 9.10(B), provided that
      such notification shall only be effective on the date specified in such
      notice or five Business Days after the notice is given, whichever is
      later.

10.   Law and Jurisdiction
      --------------------

10.1  English Law

      This Agreement shall be governed by, and construed in accordance with,
      English law.

10.2  Jurisdiction

      In relation to any legal action or proceedings to enforce this Agreement
      or arising out of or in connection with this Agreement ("Proceedings")
      each of the parties irrevocably submits to the exclusive jurisdiction of
      the English courts and waives any objection to Proceedings in such courts
      on the grounds of venue or on the grounds that the Proceedings have been
      brought in an inconvenient forum.

AS WITNESS the hands of the duly authorised representatives of the parties on
the date first before written.

                                       8
<PAGE>

                                                                   Exhibit 10.18

SIGNED by                              )
duly authorised for and on behalf of   )
IFX CORPORATION                        )
in the presence of:-                   Joel Eidelstein
                                       (Director)
Jose Leiman

Michael Shalom

Jak Bursztyn

SIGNED by                              )
for an on behalf of                    )
DUNCAN LAWRIE OFFSHORE                 )
SERVICES LIMITED                       )
in its capacity as trustee of          )
THE IFX GROUP TRUST                    )
in the presence of:-                   Shaun Ridings
                                       (Director)
Alan Molloy

                                       9

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