Document:

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                                                                    Exhibit 10.1
                                                                    ------------

                             STOCKHOLDERS AGREEMENT

                                     among

                                IFX CORPORATION,

                        UBS CAPITAL AMERICAS III, L.P.,

                                UBS CAPITAL LLC,

                   INTERNATIONAL TECHNOLOGY INVESTMENTS, LC,

                                JOEL EIDELSTEIN,

                                 MICHAEL SHALOM

                                      and

                                  LEE S. CASTY

                           dated as of June 15, 2000
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                                IFX CORPORATION

                            STOCKHOLDERS AGREEMENT

     THIS AMENDED AND RESTATED STOCKHOLDERS AGREEMENT (this "Agreement") is
entered as of June 15, 2000, among IFX CORPORATION, a Delaware corporation (the
"Company"), UBS CAPITAL AMERICAS III, L.P., a Delaware limited partnership, and
UBS CAPITAL LLC, a Delaware limited liability company (collectively, "UBS" and
together with successors and assigns, the "Investor Stockholders"),
INTERNATIONAL TECHNOLOGY INVESTMENTS, LC, a Nevada limited liability company
("ITI"), JOEL EIDELSTEIN, individually, ("Eidelstein") MICHEAL SHALOM,
individually, (and together with any Affiliated entities, "Shalom"), and LEE S.
CASTY, individually ("Casty", and collectively with ITI, Shalom and Eidelstein,
the "Stockholders").

                                   RECITALS
                                   --------

     WHEREAS, the Company and the Investor Stockholders have entered into the
IFX Corporation Preferred Stock Purchase Agreement, dated the date hereof (the
"Stock Purchase Agreement"), pursuant to which the Investor Stockholders will
purchase newly issued shares of Class I and Class II Series A Convertible
Preferred Stock, par value $1.00 per share, of the Company ("Series A Preferred
Stock"); and

     WHEREAS, the parties hereto desire to enter into certain arrangements
relating to the Company.

     NOW, THEREFORE, in consideration of the foregoing recitals and of the
mutual promises hereinafter set forth, the parties hereto agree as follows:

                                   ARTICLE I

                                  DEFINITIONS

     SECTION 1.1  Certain Defined Terms.  As used herein, the following terms
                  ---------------------
shall have the following meanings:

     "Acquisition" has the meaning assigned to such term in Section 4.1(a).

     "Acquisition Restrictions" has the meaning assigned to such term in Section
4.1(a).

     "Affiliate" means, with respect to any Person, any other Person that
directly, or indirectly through one or more intermediaries, controls, is
controlled by or is under common control with, such specified Person, for so
long as such Person remains so associated to the specified Person, or, in the
case of an individual, such individual's

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spouse, lineal descendents or a trust primarily for the benefit of such
individual or any of the foregoing.

     "Agent" has the meaning assigned to such term in Section 5.13.

     "as converted" has the meaning assigned to such term in Section 2.3.

     "beneficial owner" or "beneficially own" has the meaning given such term in
Rule 13d-3 under the Exchange Act and a Person's beneficial ownership of Common
Stock or  Series A Preferred Stock or other Voting Securities of the Company
shall be calculated in accordance with the provisions of such Rule; provided,
however, that for purposes of determining beneficial ownership, (i) a Person
shall be deemed to be the beneficial owner of any security which may be acquired
by such Person whether within 60 days or thereafter, upon the conversion,
exchange or exercise of any warrants, options, rights or other securities and
(ii) no Person shall be deemed to beneficially own any security solely as a
result of such Person's execution of this Agreement.

     "Board" means the Board of Directors of the Company.

     "Business Day" means any day that is not a Saturday, a Sunday or other day
on which banks are required or authorized by law to be closed in New York City
on the city of Miami, Florida.

     "Buyer" has the meaning assigned to such term in Section 3.6.

     "Bylaws" means the Bylaws of the Company, as in effect on the date hereof
and as the same may be amended, supplemented or otherwise modified from time to
time in accordance with the terms thereof, the terms of the Certificate and the
terms of this Agreement.

     "Capital Stock" means, with respect to any Person at any time, any and all
shares, interests, participations or other equivalents (however designated,
whether voting or non-voting) of capital stock, partnership interests (whether
general or limited) or equivalent ownership interests in or issued by such
Person, and includes, in the case of the Company without limitation, any and all
shares of Common Stock and Series A Preferred Stock.

     "Casty" has the meaning assigned to such term in the preamble.

     "Casty Representative" has the meaning assigned to such term in Section
2.1(a).

     "Certificate" means the Certificate of Incorporation of the Company, as in
effect on the date hereof and as the same may be amended, supplemented or
otherwise modified from time to time in accordance with the terms thereof.

     "Certificate of Designation" means the Certificate of Designation, Number,
Powers, Preferences and Relative, Participating and Other Rights of Series A
Convertible Preferred Stock of the Company in the form attached as Exhibit B to
the Stock Purchase Agreement.

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     "Common Stock" means the common stock, par value $0.02 per share, of the
Company and any securities issued in respect thereof, or in substitution
therefor, in connection with any stock split, dividend or combination, or any
reclassification, recapitalization, merger, consolidation, exchange or other
similar reorganization.

     "control" (including the terms "controlled by" and "under common control
with"), with respect to the relationship between or among two or more Persons,
means the possession, directly or indirectly, of the power to direct or cause
the direction of the affairs or management of a Person, whether through the
ownership of voting securities, as trustee or executor, by contract or
otherwise.

     "Director" means any member of the Board.

     "Eidelstein" has the meaning assigned to such term in the preamble.

      "Equity Securities" means any and all shares of Capital Stock of the
Company, securities of the Company convertible into, or exchangeable or
exercisable for, such shares, and options, warrants or other rights to acquire
such shares.

     "Exchange Act" means the Securities Exchange Act of 1934, as amended, or
any similar federal statute and the rules and regulations promulgated
thereunder.

     "Holder" means an Investor Stockholders and any other holder of Equity
Securities who or which is a permitted transferee of an Investor Stockholders
pursuant to Section 3.1(c).

     "Independent Director" has the meaning specified in Rule 4200(a)(15) of the
NASD listing standards, as in effect on the date hereof and as the same may be
amended or supplemented, or in any successor rule or regulation.

     "Investor Representative" has the meaning assigned to such term in Section
2.1(a).

     "ITI" has the meaning assigned to such term in the preamble.

     "ITI Representative" has the meaning assigned to such term in Section
2.1(a).

     "Joint Representative" has the meaning assigned to such term in Section
2.1(a).

     "NASD" means the National Association of Securities Dealers, Inc.

     "Offer" has the meaning assigned to such term in Section 3.5(a).

     "Offered Shares" has the meaning assigned to such term in Section 3.5(a).

     "Person" means any individual, corporation, limited liability company,
limited or general partnership, joint venture, association, joint-stock company,
trust, unincorporated

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organization, government or any agency or political subdivisions thereof or any
other entity.

     "Proposed Transferee" has the meaning assigned to such term in Section
3.5(a).

     "Pro Rata Fraction" has the meaning assigned to such term in Section
3.5(c).

     "Qualified Public Offering" has the meaning assigned to such term in the
Stock Purchase Agreement.

     "Registration Agreement" has the meaning assigned to such term in the Stock
Purchase Agreement.

     "Representatives" has the meaning assigned to such term in Section 2.1(b).

     "SEC" means the U.S. Securities and Exchange Commission or any other
federal agency then administering the federal securities laws.

     "Securities Act" has the meaning assigned to such term in Section 3.1.

     "Series A Preferred Stock" has the meaning assigned to such term in the
recitals.

     "Seller" has the meaning assigned to such term in Section 3.5(a).

     "Shalom" has the meaning assigned to such term in the preamble.

     "Stockholder" has the meaning assigned to such term in the preamble.

     "Stock Purchase Agreement" has the meaning assigned to such term in the
recitals.

     "Subsequent Closing" has the meaning assigned to such term in the Stock
Purchase Agreement.

     "Transfer" means, directly or indirectly, to sell, transfer, assign,
pledge, encumber, hypothecate or similarly dispose of, either voluntarily or
involuntarily, or to enter into any contract, option or other arrangement or
understanding with respect to the sale, transfer, assignment, pledge,
encumbrance, hypothecation or similar disposition of, any shares of Equity
Securities beneficially owned by a Person or any interest in any shares of
Equity Securities beneficially owned by a Person.

     "Voting Securities" means, at any time, shares of any class of Equity
Securities of the Company which are then entitled to vote generally in the
election of Directors.

     SECTION 1.2  Other Definitional Provisions.
                  -----------------------------

          (a)  The words "hereof", "herein" and "hereunder" and words of similar
  import when used in this Agreement shall refer to this Agreement as a whole

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  and not to any particular provision of this Agreement, and Article and Section
  references are to this Agreement unless otherwise specified.

          (b)  The meanings given to terms defined herein shall be equally
  applicable to both the singular and plural forms of such terms.

                                   ARTICLE II

                              CORPORATE GOVERNANCE

     SECTION 2.1  Board Representation.
                  --------------------

          (a)  Effective on the date hereof, the Board shall, except as
  otherwise provided below, be comprised of seven (7) Directors of whom: (i) two
  (2) shall be designees of the Investor Stockholders (the "Investor
  Representatives"), (ii) one (1) shall be a designee of ITI (the "ITI
  Representative"), (iii) one (1) shall be a designee of Casty (the "Casty
  Representative"), (iv) one (1) shall be jointly designated by ITI and Casty
  (the "Joint Representative") and (v) the others shall be Independent Directors
  acceptable to the Investor Stockholders (with such consent not to be
  unreasonably withheld) who, commencing with the election of Directors at the
  next annual meeting of stockholders, have been elected by the holders of a
  majority of the outstanding Voting Securities. The initial Investor
  Representatives shall be Charles W. Moore and Mark O. Lama, the initial ITI
  Representative shall be Michael Shalom, the initial Casty Representative shall
  be Joel Eidelstein, and the initial Joint Representative shall be Zalman
  Lekach. If, at any time, ITI and Casty are unable to agree upon the
  designation of a Joint Representative, the Joint Representative shall be
  designated by Jose Leiman. Notwithstanding the foregoing, at such time as an
  Independent Director acceptable to the Investor Stockholders (with such
  consent not to be unreasonably withheld) and the holders of a majority of the
  outstanding Voting Securities held by the Stockholders has been elected to the
  Board, the Investor Stockholders shall only be entitled to designate one
  Investor Representative, and the Investor Stockholders shall thereafter, as
  promptly as practicable, take all action necessary to cause one of the
  Investor Representatives to resign from the Board. For purposes hereof, the
  Series A Preferred Director (as defined in the Certificate of Designation)
  shall count as one of the two Investor Representatives.

          (b)  The Company shall take such action as may be required under
  applicable law (i) to cause the Board to consist of the number of Directors
  specified in clause (a), (ii) to include in the slate of nominees recommended
  by the Board the Investor Representatives, the ITI Representative, the Casty
  Representative and the Joint Representative (collectively, the
  "Representatives"), with the remaining Directors to be Independent Directors
  acceptable to the Investor Stockholders (with such acceptance not to be
  unreasonably withheld) and (iii) to cause the Investor Representatives to be
  duly appointed in accordance with the foregoing and the Certificate of
  Designation.  The Company agrees to use its reasonable best efforts to

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  cause the election of the Representatives to the Board, including nominating
  such individuals to be elected as Directors as provided herein.

          (c)  Each of the Investor Stockholders, ITI and Casty agrees to vote,
  or act by written consent with respect to any Voting Securities beneficially
  owned by him or it, at each annual or special meeting of the stockholders of
  the Company at which Directors are to be elected or to take all actions by
  written consent in lieu of any such meeting as are necessary to cause the
  Representatives designated by the others in accordance with the terms of this
  Agreement to be elected to the Board and agrees to use his or its reasonable
  best efforts to cause the election of each such designee to the Board,
  including nominating such individuals to be elected as Directors.

          (d)  In the event that a vacancy is created at any time by the death,
  disability, retirement, resignation or removal (with or without cause) of any
  Representative, the remaining Directors and the Company shall cause the
  vacancy created thereby to be filled by a new designee of the party or parties
  that designated such Director as soon as possible, who is designated in the
  manner specified in this Section 2.1.  Each of the Company, each Investor
  Stockholders, ITI and Casty hereby agrees to take, at any time and from time
  to time, all actions necessary to accomplish the same.  Upon the written
  request of the Investor Stockholders, ITI and/or Casty, as the case may be,
  each of the others shall vote, or act by written consent with respect to all
  Voting Securities beneficially owned by him or it and otherwise take or cause
  to be taken all actions necessary to remove any Director designated by the
  former.  Unless the Investor Stockholders, ITI and/or Casty, as the case may
  be, shall otherwise request in writing, none of the others shall take any
  action to cause the removal of any Director designated by the former.

          (e)  Without the written consent of the Investor Stockholders, each of
  the Company, ITI and Casty agrees not to take any action that would cause the
  number of Directors constituting the entire Board to be other than seven (7).

          (f)  The covenants and agreements set forth herein shall be subject to
  the fiduciary obligations of the designees of the Investor Stockholders, ITI
  and Casty now or hereafter serving on the Board and shall not prevent the
  designees of the Investor Stockholders, ITI or Casty now or hereafter serving
  on the Board from taking any action or refraining to take any action while
  acting in the capacity as a Director of the Company. The foregoing shall not
  limit the obligations of the Investor Stockholders, ITI and Casty in their
  capacity as stockholders of the Company hereunder.

     SECTION 2.2 Committees.  The Company shall, except as provided below, by
                 ----------
amending its Bylaws or otherwise, establish and maintain a Compensation
Committee and an Audit Committee of the Board which satisfies the requirements
of this Section.  Each Committee shall consist of three (3) Directors, one (1)
of whom shall be an Investor Representative.  The Compensation Committee shall
have responsibility for compensation matters customarily addressed by
compensation committees of similarly

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situated companies and shall have the full power and authority of the Board with
respect thereto, except as limited by applicable law. The two (2) members of the
Committee who are not Investor Representatives may not be employees of the
Company or any subsidiary. The Audit Committee shall have responsibility for
matters customarily addressed by audit committees of similarly situated
companies and shall have the full power and authority of the Board with respect
thereto, except as limited by applicable law. The two (2) members of the Audit
Committee who are not Investor Representatives shall not be members of the
Compensation Committee. Notwithstanding anything to the contrary herein, the
Investor Stockholders acknowledge and agree that the composition of the
Compensation and Audit Committees must satisfy any applicable rules and
regulations of the SEC and the NASD as in effect from time to time.

     SECTION 2.3  Termination of Rights.  Notwithstanding Section 2.1, at such
                  ---------------------
time following a Qualified Public Offering as the Investor Stockholders and
their Affiliates shall cease to own in the aggregate at least 25% of the number
of shares of Common Stock (determined with respect to the Preferred Stock and
any other Equity Securities owned by the Investor Stockholders and their
Affiliates that are convertible into, or exchangeable or exercisable for Common
Stock, on an as-converted, exchanged or exercised basis (any determination made
in accordance with the foregoing shall hereinafter be referred to as "as
converted")) that the Investor Stockholders held as of the Subsequent Closing
(adjusted for stock splits, combinations, stock dividends and the like), the
Investor Stockholders shall cease to have the right to designate Directors and
members of the Compensation Committee and Audit Committee pursuant to Sections
2.1 and 2.2, and all other rights of the Investor Stockholders under this
Article II shall terminate.

                                  ARTICLE III

                                   TRANSFERS

     SECTION 3.1  Investor Stockholders Transfers.  Each Investor Stockholders
                  -------------------------------
hereby agrees that it shall not Transfer any shares of its Equity Securities,
unless such Transfer is effected through (a) a public offering registered under
the Securities Act of 1933, as amended, and the rules and regulations
promulgated thereunder (the "Securities Act"), (b) sales made pursuant to Rule
144 under the Securities Act, or any successor provisions or (c) sales involving
Transfers of Equity Securities with a purchase price in excess of $1,000,000
(per transaction) which may be effected without registration under the
Securities Act, provided that any Transfer to a Person which the Company
reasonably considers a competitor shall be prohibited for purposes of clause
(c).  Any Equity Securities Transferred pursuant to clauses (a) or (b) shall no
longer be subject to this Agreement.  Each transferee Holder under clause (c)
shall agree in writing with the Company and the other Stockholders as a
condition to such Transfer, to be bound by all of the provisions of this
Agreement to the same extent as if such transferee were the transferring
Investor Stockholders, and all stock certificates representing shares
transferred to a Holder shall bear a legend providing notice of the restrictions
contained in this Agreement.

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     SECTION 3.2  Stockholder Transfers.  Each Stockholder hereby agrees that it
                  ---------------------
shall not Transfer any shares of its Equity Securities, unless such Transfer is
effected through (a) a public offering registered under the Securities Act, (b)
sales made pursuant to Rule 144 under the Securities Act or any successor
provisions or (c) a Transfer otherwise permitted hereunder and in compliance
herewith.  Transfers pursuant to clause (b) or (c) shall also comply with
Section 3 of the Restated Registration Agreement.  Any Equity Securities
Transferred pursuant to clauses (a) or (b) shall no longer be subject to this
Agreement, except as provided herein.

     SECTION 3.3  Transfers by Eidelstein, ITI and Shalom.
                  ---------------------------------------

          (a)  ITI and Shalom agree that neither such Stockholder nor any of its
  Affiliates shall, Transfer more than the number of Shares of Common Stock
  permitted under Rule 144(e) of the Securities Act until the Pledge Agreements
  (as defined below) are satisfied, and thereafter, ITI and Shalom agree that
  neither such Stockholder nor any of its Affiliates shall, Transfer more than
  25,000 Shares of Common Stock during any calendar quarter, in each case,
  without the written consent of the Investor Stockholders  or without
  compliance with Sections 3.5 and 3.6; provided that Transfers by ITI and
  Shalom shall be aggregated for purposes of the foregoing. Eidelstein hereby
  agrees that neither he nor any of his Affiliates shall, Transfer more than
  25,000 Shares of Common Stock during any calendar quarter ("Permitted Sales")
  without the written consent of the Investor Stockholders, which consent shall
  not be unreasonably withheld or delayed or without compliance with Sections
  3.5 and 3.6. Notwithstanding the foregoing, (i) such Stockholders may Transfer
  all or any of their Equity Securities (x) by way of gift to any member of such
  Stockholder's family or to any trust for the benefit of any such family member
  of such Stockholder or to any other Affiliate (including, without limitation,
  the members of ITI), provided that any such transferee shall agree in writing
  with the Company and the Investor Stockholders as a condition to such
  Transfer, to be bound by all of the provisions of this Agreement to the same
  extent as if such transferee were such Stockholder, or (y) by will or the laws
  of descent and distribution; provided, however, in such event each such
  transferee shall be bound by all of the provisions of this Agreement to the
  same extent as if such transferee were such Stockholder; and provided,
  further, that each such transferee shall execute an irrevocable proxy
  appointing the original Stockholder (except in the case of death of the
  original Stockholder) transferring such shares as proxy to vote all such
  shares so transferred, such appointment shall be coupled with an interest, and
  all stock certificates representing such shares shall bear a legend providing
  notice of such appointment of proxy and the restrictions contained in this
  Agreement, and (ii) the restrictions described herein shall not prohibit the
  pledges by ITI of 6,000,000 shares of Common Stock, in the aggregate, pursuant
  to the pledge agreements listed on Exhibit A hereto (the "Pledge Agreements")
                                     ---------
  or any replacement or substitute agreement which shall be on no less favorable
  terms to the pledgor than the Pledge Agreements, but such shares shall
  otherwise be subject to this Agreement.  As used herein, the term "family"
  shall include any spouse, lineal ancestor or descendant, brother or sister.

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          (b)  The provisions of this Section 3.3 shall terminate upon the
  earlier of: (i) a Qualified Public Offering and (ii) the time at which the
  Investor Stockholders and the other Holders own fewer than 50% of the number
  of shares of Common Stock (determined on an as converted basis) that the
  Investor Stockholders owned as of the Subsequent Closing (adjusted for stock
  splits, combinations, stock dividends and the like).

     SECTION 3.4  Transfers by Casty.  Casty agrees that neither he nor any of
                  ------------------
his Affiliates shall, Transfer more than the number of Shares of Common Stock
permitted under Rule 144(e) of the Securities Act without the written consent of
the Investor Stockholders, which consent shall not be unreasonably withheld or
delayed or without compliance with Sections 3.5 and 3.6.  Notwithstanding the
foregoing, Casty may Transfer all or any of his Equity Securities (a) by way of
gift to any member of such Stockholder's family or to any trust for the benefit
of any such family member of such Stockholder or to any other Affiliate,
provided that any such transferee shall agree in writing with the Company and
the Investor Stockholders as a condition to such Transfer, to be bound by all of
the provisions of this Agreement to the same extent as if such transferee were
such Stockholder, or (b) by will or the laws of descent and distribution;
provided, however, in such event each such transferee shall be bound by all of
the provisions of this Agreement to the same extent as if such transferee were
such Stockholder; and provided, further, that each such transferee shall execute
an irrevocable proxy appointing the original Stockholder (except in the case of
death of the original Stockholder) transferring such shares as proxy to vote all
such shares so transferred, such appointment shall be coupled with an interest,
and all stock certificates representing such shares shall bear a legend
providing notice of such appointment of proxy and the restrictions contained in
this Agreement.

     SECTION 3.5  Right of First Refusal on Certain Transfers.
                  -------------------------------------------

          (a)  If at any time ITI, Shalom, Casty, Eidelstein or any of their
respective Affiliates, other than the Company, desires to Transfer all or any
part of their Equity Securities, (other than pursuant to Permitted Sales) to any
Person (the "Proposed Transferee"), such Stockholder (the "Seller") shall,
except as provided below, submit a written offer (the "Offer") to sell such
Equity Securities (the "Offered Shares") first to the Company, and second to the
Holders on the same terms and conditions on which the Seller proposes to sell
such Offered Shares to the Proposed Transferee.  The parties acknowledge and
agree that any Transfer described in the second sentence of Section 3.3(a) or in
Section 3.4 shall not be subject to the terms of this Section.  The Offer shall
disclose the identity of the Proposed Transferee, the Offered Shares proposed to
be sold, the terms and conditions, including price, of the proposed sale, and
any other material facts relating to the proposed sale.  The Offer shall further
state that the Company and the Holders may acquire, in accordance with the
provisions of this Agreement, all or any portion of the Offered Shares for the
price and upon the other terms and conditions, including deferred payment (if
applicable), set forth therein.

          (b)  Upon receipt of the Offer, if the Company desires to purchase all
or any part of the Offered Shares, the Company shall communicate in writing its
election

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to purchase to the Seller, which communication shall state the number of Offered
Shares the Company desires to purchase and shall be given to the Seller in
accordance with Section 5.4 below within thirty (30) days of the date the Offer
was made. Such notice shall, when taken in conjunction with the Offer, be deemed
to constitute a valid, legally binding and enforceable agreement for the sale
to, and purchase by, the Company of the number of Offered Shares specified by
the Company in such notice and on the terms of the Offer. Sales of the Offered
Shares to be sold to the Company pursuant to this Section 3.5(b) shall be made
at the offices of the Company on the 45th day following the date the Offer was
made (or if such 45th day is not a Business Day, then on the next succeeding
Business Day). Such sales shall be effected by the Seller's delivery to the
Company of a certificate or certificates evidencing the Offered Shares to be
purchased by it, duly endorsed for transfer to the Company, against payment to
the Seller of the purchase price therefor by the Company.

          (c)  Each Holder shall, subject to the prior purchase right of the
Company, have the absolute right to purchase that number of Offered Shares not
purchased by the Company as shall be equal to the number of Offered Shares not
purchased by the Company multiplied by a fraction, the numerator of which shall
be the number of shares of Common Stock (determined on an as converted basis)
then owned by such Holder and the denominator of which shall be the aggregate
number of shares of Common Stock (determined on an as converted basis) then
owned by all of the Holders. The amount of Offered Shares that each Holder is
entitled to purchase under this Section 3.5(c) shall be referred to as its "Pro
Rata Fraction." The Holders shall have a right of oversubscription such that if
any Holder fails to accept the Offer as to its Pro Rata Fraction, the other
Holders shall, among them, have the right to purchase up to the balance of the
Offered Shares not so purchased. Such right of oversubscription may be exercised
by a Holder by accepting the Offer as to more than its Pro Rata Fraction. If, as
a result thereof, such oversubscriptions exceed the total number of Offered
Shares available in respect of such oversubscription privilege, the
oversubscribing Holders shall be cut back with respect to their
oversubscriptions on a pro rata basis in accordance with their respective Pro
Rata Fractions or as they may otherwise agree among themselves. If a Holder
desires to purchase all or any portion of the Offered Shares, said Holder shall
communicate in writing its election to purchase to the Seller and the Company,
which communication shall state the number of Offered Shares said Holder desires
to purchase and shall be given to the Seller in accordance with Section 5.4
below within thirty (30) days of the date the Offer was made. Such communication
shall, when taken in conjunction with the Offer, be deemed to constitute a
valid, legally binding and enforceable agreement for the sale and purchase of
such Offered Shares (subject to the aforesaid limitations as to a Holder's right
to purchase more than its Pro Rata Fraction) and on the terms of the Offer.
Sales of the Offered Shares to be sold to purchasing Holders pursuant to this
Section 3.5(c) shall be made at the offices of the Company on the later of (i)
the 45th day following the date the Offer was made (or if such later of (i) the
45th day is not a Business Day, then on the next succeeding Business Day) and
(ii) the third Business Day following receipt of all material governmental or
other consents in connection with such sale. Such sales shall be effected by the
Seller's delivery to each purchasing Holder of a certificate or certificates
evidencing the Offered Shares to be

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     purchased by it, duly endorsed for transfer to such purchasing Holder,
     against payment to the Seller of the purchase price therefor by such
     purchasing Holder.

          (d)  If the Holders and the Company do not purchase in the aggregate
     all of the Offered Shares, the Offered Shares not so purchased may be sold
     by the Seller at any time within 90 days after the date the Offer was made,
     subject to the provisions of Section 3.6 hereof. Any such sale shall be to
     the Proposed Transferee, at the price and upon the other terms and
     conditions specified in the Offer. Any Offered Shares not sold within such
     90-day period shall continue to be subject to the requirements of a prior
     offer pursuant to this Section 3.5. If Offered Shares are sold pursuant to
     this Section 3.5 to any purchaser who is not a party to this Agreement, the
     Offered Shares so sold shall no longer be subject to this Agreement.

          (e)  The provisions of this Section 3.5 shall terminate upon the
     earlier of: (i) a Qualified Public Offering and (ii) the time at which the
     Investor Stockholders and the other Holders own fewer than 50% of the
     number of shares of Common Stock (determined on an as converted basis) that
     the Investor Stockholders owned as of the Subsequent Closing (adjusted for
     stock splits, combinations, stock dividends and the like).

        SECTION 3.6 Right of Participation in Sales.
                    -------------------------------

          (a)  If at any time the Seller desires to Transfer all or any part of
     the Equity Securities owned by the Seller to any Person other than one or
     more of the Holders (the "Buyer"), each of the Holders shall, except as
     provided below, have the right to sell to the Buyer, as a condition to such
     sale by the Seller, at the same price per share and on the same terms and
     conditions as involved in such sale by the Seller, the same percentage of
     the shares of Common Stock (on an as converted basis) owned by such Holder
     as the shares of Common Stock (on an as converted basis) to be sold by the
     Seller to the Buyer represents with respect to the shares of Common Stock
     (on an as converted basis) owned by the Seller immediately prior to the
     sale of any of the Seller's shares of Equity Securities to the Buyer. The
     parties acknowledge and agree that any Transfer described in the second
     sentence of Section 3.3(a) or in Section 3.4 or which, pursuant to the
     terms of Section 3.5(a) is not the subject of an Offer, shall not be
     subject to the terms of this Section.

          (b)  Each Holder wishing to so participate in any sale under this
     Section 3.6 shall notify the Seller in writing of such intention as soon as
     practicable after such Holder's receipt of the Offer made pursuant to
     Section 3.5, and in any event within twenty (20) days after the date the
     Offer was made. Such notification shall be given to the Seller in
     accordance with Section 5.4 below.

          (c)  The Seller and each participating Holder shall sell to the Buyer
     all, or at the option of the Buyer, any part of the Equity Securities
     proposed to be sold by them at the price and upon other terms and
     conditions contained in the Offer provided by the Seller under Section 3.5
     above; provided however, that any purchase of less than all of such Equity
     Securities by the Buyer shall be made from the Seller and each

                                      11
<PAGE>

     participating Holder pro rata based upon the relative amount of the Equity
     Securities that the Seller and each participating Holder is otherwise
     entitled to sell pursuant to Section 3.6(a).

          (d)  Any Equity Securities sold by the Seller or a participating
     Holder pursuant to this Section 3.6 shall no longer be subject to this
     Agreement.

          (e)  The provisions of this Section 3.6 shall terminate upon the
     earlier of: (i) a Qualified Public Offering and (ii) the time at which the
     Investor Stockholders and the other Holders own fewer than 50% of the
     number of shares of Common Stock (determined on an as-converted basis) that
     the Investor Stockholders owned as of the Subsequent Closing (adjusted for
     stock splits, combinations, stock dividends and the like).

                                  ARTICLE IV

                                  STANDSTILL

        SECTION 4.1 Acquisition of Additional Voting Securities.
                    -------------------------------------------

          (a)  Until the second anniversary of the date hereof, except as
otherwise provided in this Section 4.1, each of the Investor Stockholders
covenants and agrees with the Company that it shall not, and shall cause each of
its controlled Affiliates not to, directly or indirectly, acquire, offer or
propose to acquire or agree to acquire, whether by purchase, tender or exchange
offer, through the acquisition of control of another Person (including by way of
merger or consolidation), by joining a partnership, syndicate or other group
(within the meaning of Section 13(d)(3) of the Exchange Act) or otherwise, the
beneficial ownership of any additional Voting Securities if following such
proposed acquisition (an "Acquisition") the Investor Stockholders together with
their Affiliates would beneficially own, in the aggregate, in excess of 20% of
the voting power represented by the Company's Voting Securities (the "Permitted
Ownership Percentage") on an as converted and fully diluted basis (except (i) by
way of stock dividends, stock reclassifications or other distributions or
offerings made available and, if applicable, exercised on a pro rata basis, to
holders of Equity Securities of the Company generally, (ii) Equity Securities
acquired from the Company (including upon conversion of shares of Series A
Preferred Stock) and (iii) pursuant to this Agreement (the "Acquisition
Restrictions"); provided, however, that the foregoing Acquisition Restrictions
shall not apply to any Acquisition that is approved by a majority of the
Directors, excluding for the purposes of such approval any Investor Directors.

          (b)  Upon a repurchase or redemption of Equity Securities by the
Company that, by reducing the number of outstanding Equity Securities, increases
the Investor Stockholders' ownership percentage to an amount in excess of the
then-applicable Permitted Ownership Percentage, none of the Investor
Stockholders or their Affiliates shall be required to dispose of Equity
Securities beneficially owned by them; provided, however, that in such event,
none of the Investor Stockholders or their

                                      12
<PAGE>

Affiliates may purchase additional Equity Securities until such time as their
ownership percentage is less than the then-applicable Permitted Ownership
Percentage.

          (c)  Subject to Section 4.1(b) at any time the Investor Stockholders
or any of their Affiliates become aware that the Investor Stockholders and their
Affiliates beneficially own in the aggregate more than the Permitted Ownership
Percentage, then the Investor Stockholders shall, as soon as is reasonably
practicable (but in no manner that would require the Investor Stockholders or
any such Affiliate to incur liability under Section 16(b) of the Exchange Act),
take all action necessary to reduce the amount of Equity Securities beneficially
owned by them and their Affiliates to an amount not greater than the Permitted
Ownership Percentage in effect at such time.

                                   ARTICLE V

                                 MISCELLANEOUS

     SECTION 5.1  Termination.  Except as otherwise provided herein, the
                   -----------
provisions of this Agreement shall terminate: (a) upon the agreement of all of
the parties hereto, (b) at the time at which the Investor Stockholders and the
other Holders own fewer than 50% of the number of shares of Common Stock
(determined on an as converted basis that the Investor Stockholders owned as of
the Subsequent Closing (adjusted for stock splits, combinations, stock dividends
and the like), and (c) with respect to any of ITI, Shalom, Eidelstein, Casty and
its respective permitted transferees referred to in clause (i) of the second
sentence of Section 3.3(a) or in Section 3.4, as the case may be, when such
Stockholder together with its permitted transferees owns less than 2% of the
outstanding Common Stock, on an as converted basis.

     SECTION 5.2  Amendments and Waivers.  Except as otherwise provided herein,
                  ----------------------
no modification, amendment or waiver of any provision of this Agreement shall be
effective against the Company or any other party unless such modification,
amendment or waiver is approved in writing by the Company and the Agent, acting
on behalf of the Investor Stockholders.  The failure of any party to enforce any
of the provisions of this Agreement shall in no way be construed as a waiver of
such provisions and shall not affect the right of such party thereafter to
enforce each and every provision of this Agreement in accordance with its terms.

     SECTION 5.3  Successors, Assigns and Transferees.  This Agreement shall
                  -----------------------------------
bind and inure to the benefit of and be enforceable by the parties hereto and
their respective heirs, personal representatives, successors and permitted
assigns.  This Agreement may not be assigned by any party hereto without the
prior written consent of the other parties, except as otherwise provided herein.

     SECTION 5.4  Notices.  All notices required or permitted hereunder shall be
                  -------
in writing and shall be deemed effectively given: (a) upon personal delivery to
the party to be notified; (b) when sent by confirmed facsimile if sent during
normal business hours of the recipient, if not, then on the next business day;
(c) five (5) days after having been sent

                                      13
<PAGE>

by registered or certified mail, return receipt requested, postage prepaid; or
(d) one (1) business day after deposit with a nationally recognized overnight
courier, specifying next day delivery, with written verification of receipt. All
communications shall be sent, with respect to the Company and the Investor
Stockholders, to their respective addresses specified in the Stock Purchase
Agreement (or at such other address as any such party may specify by like
notice) and, with respect to any other party, to the address of such party as
shown in the stock record books of the Company (or at such other address as any
such party may specify to all of the above by like notice).

     SECTION 5.5  Further Assurances.  At any time or from time to time after
                  ------------------
the date hereof, the parties agree to cooperate with each other, and at the
request of any other party, to execute and deliver any further instruments or
documents and to take all such further action as the other party may reasonably
request in order to evidence or effectuate the consummation of the transactions
contemplated hereby and otherwise to carry out the intent of the parties
hereunder.

     SECTION 5.6  Entire Agreement.  Except as otherwise expressly set forth
                  ----------------
herein, this document, the Stock Purchase Agreement and the Restated
Registration Agreement embody the complete agreement and understanding among the
parties hereto with respect to the subject matter hereof and supersede and
preempt any prior understandings, agreements or representations by or among the
parties, written or oral, that may have related to the subject matter hereof in
any way.

     SECTION 5.7  Delays or Omissions.  It is agreed that no delay or omission
                  -------------------
to exercise any right, power or remedy accruing to any party, upon any breach,
default or noncompliance by another party under this Agreement, shall impair any
such right, power or remedy, nor shall it be construed to be a waiver of any
such breach, default or noncompliance, or any acquiescence therein, or of or in
any similar breach, default or noncompliance thereafter occurring.  It is
further agreed that any waiver, permit, consent or approval of any kind or
character on the part of any party hereto of any breach, default or
noncompliance under this Agreement or any waiver on such party's part of any
provisions or conditions of this Agreement, must be in writing and shall be
effective only to the extent specifically set forth in such writing.  All
remedies, either under this Agreement, by law, or otherwise afforded to any
party, shall be cumulative and not alternative.

     SECTION 5.8  Governing Law; Jurisdiction; Waiver of Jury Trial. This
                  -------------------------------------------------
Agreement shall be governed by and construed and enforced in accordance with the
internal laws of the State of New York without regard to the principles of
conflicts of law thereof.  Each party hereto hereby irrevocably submits to the
nonexclusive jurisdiction of the courts of the state of New York and of the
United States of America sitting in the City of New York, Borough of Manhattan,
for the adjudication of any dispute hereunder or in connection herewith or with
any transaction contemplated hereby or discussed herein, and hereby irrevocably
waives, and agrees not to assert in any suit, action or proceeding, any claim
that it is not personally subject to the jurisdiction of any such court, that
the venue thereof may not be appropriate, that such suit, action or proceeding
is improper or that this Agreement or any of the documents referred to in this
Agreement may not be

                                      14
<PAGE>

enforced in or by said courts, and each party hereto irrevocably agrees that all
claims with respect to such suit, action or proceeding may be heard and
determined in such a New York state or federal court. Each party hereby
irrevocably waives personal service of process and consents to process being
served in any such suit, action or proceeding by mailing a copy thereof to such
party in the manner provided in Section 12(b) of the Stock Purchase Agreement
and agrees that such service shall constitute good and sufficient service of
process and notice thereof. Nothing contained herein shall be deemed to limit in
any way any right to serve process in any manner permitted by law. EACH PARTY
HEREBY IRREVOCABLY WAIVES ANY RIGHT IT MAY HAVE, AND AGREES NOT TO REQUEST, A
JURY TRIAL FOR THE ADJUDICATION OF ANY DISPUTE HEREUNDER OR IN CONNECTION
HEREWITH OR ARISING OUT OF THIS AGREEMENT OR ANY TRANSACTION CONTEMPLATED
HEREBY.

     SECTION 5.9  Severability.  Whenever possible, each provision of this
                  ------------
Agreement shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement is held to be invalid,
illegal or unenforceable in any respect under any applicable law or rule in any
jurisdiction, such invalidity, illegality or unenforceability shall not affect
any other provision or any other jurisdiction, but this Agreement shall be
reformed, construed and enforced in such jurisdiction as if such invalid,
illegal or unenforceable provision had never been contained herein.

     SECTION 5.10 Enforcement.  Each party hereto acknowledges that money
                  -----------
damages would not be an adequate remedy in the event that any of the covenants
or agreements in this Agreement are not performed in accordance with its terms,
and it is therefore agreed that in addition to and without limiting any other
remedy or right it may have, the non-breaching party will have the right to an
injunction, temporary restraining order or other equitable relief in any court
of competent jurisdiction enjoining any such breach and enforcing specifically
the terms and provisions hereof.

     SECTION 5.11 Titles and Subtitles.  The titles of the sections and
                  --------------------
subsections of this Agreement are for convenience of reference only and are not
to be considered in construing this Agreement

     SECTION 5.12 Legend.  Each certificate evidencing any of the shares of
                  ------
Equity Securities held by the parties hereto shall bear a legend substantially
as follows:

          "THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO THE TERMS
       AND CONDITIONS OF THE STOCKHOLDERS AGREEMENT, DATED AS OF JUNE, 2000, AS
       THE SAME MAY BE AMENDED, A COPY OF WHICH THE COMPANY WILL FURNISH TO THE
       HOLDER OF THIS CERTIFICATE UPON REQUEST AND WITHOUT CHARGE."

     SECTION 5.13 Appointment of Agent.
                  --------------------

                                      15
<PAGE>

     Each of the Investor Stockholders hereby irrevocably appoints UBS (the
"Agent") to act as its true and lawful agent and attorney-in-fact and
representative with full power and authority in its name, place and stead to act
on its behalf for all purposes under this Agreement.  The foregoing power of
attorney is hereby declared to be irrevocable and coupled with an interest, and
such appointment includes, among other powers, the power and authority to
exercise all rights and privileges, and to discharge all obligations, of the
Investor Stockholders under this Agreement, including:

          (a)  designating and removing the Investor Representatives and
otherwise taking all actions required to be taken by the Investor Stockholders
under Article II, including providing consents;

          (b)  providing consents to Transfers under Section 3.3;

          (c)  giving and receiving notices hereunder and service of process in
any legal action or other proceedings arising out of or related to this
Agreement and the transactions hereby; and

          (d)  amending or waiving the provisions of this Agreement.

Any instructions given by the Agent hereunder shall be validly given on behalf
of each of the Investor Stockholders, and the Company shall have the right to
rely thereon.  UBS hereby accepts the appointment provided for in this Agreement
and agrees to be bound by the provisions of this Agreement.  All decisions and
actions by the Agent shall be binding upon each of the Investor Stockholders and
no Investor Stockholders shall have the right to object, dissent, protest or
otherwise contest the same.  The Company may conclusively rely upon any action
taken by the Agent hereunder.

     SECTION 5.14 Termination.  By its execution hereof, each of the Company,
                  -----------
ITI Emerging Networks, Inc. and Casty agrees that the Subscription and Joint
Venture Agreement, dated as of November 23, 1998, as amended, by and among the
Company, Emerging Networks, Inc., ITI and Casty shall terminate concurrently
with the execution and delivery of this Agreement.

     SECTION 5.15 Stockholder's Representation. (a) Each of the Stockholders
                  ----------------------------
severally (and not jointly) represents and warrants that all of the Equity
Securities owned by it/him and any of its/his Affiliates is set forth on Exhibit
A hereto and that each such Stockholder or it/his Affiliate owns such Equity
Securities listed opposite its/his/their name free and clear of all Encumbrances
(as defined in the Stock Purchase Agreement) except, with respect to Shalom, the
Pledge Agreement.

          (b)  Each of Shalom and ITI severally (and not jointly) represents and
  warrants that Shalom controls the voting and disposition rights on all shares
  of Equity Securities owned by ITI or any of ITI's Affiliates.

                                      16
<PAGE>

     SECTION 5.16 Counterparts; Facsimile Signatures.  This Agreement may be
                  ----------------------------------
executed in any number of counterparts, each of which shall be an original, but
all of which together shall constitute one instrument.  This Agreement may be
executed by facsimile signature(s).

                  [Remainder of Page Intentionally Left Blank]

                                      17
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed the STOCKHOLDERS
AGREEMENT as of the date set forth in the first paragraph hereof.

                                   IFX CORPORATION

                                   By:  /s/ Joel Eidelstein
                                        ----------------------------------------
                                        Name:  Joel Eidelstein
                                        Title: President

                                   UBS CAPITAL AMERICAS III, L.P.

                                   By:  UBS Capital Americas (LA-Advisors),  LLC

                                   By:  /s/ Charles W. Moore
                                        ----------------------------------------
                                        Name:  Charles W. Moore
                                        Title: Principal

                                   By:  /s/ Marc Unger
                                        ----------------------------------------
                                        Name:  Marc Unger
                                        Title: Chief Financial Officer

                                   UBS CAPITAL LLC

                                   By:  /s/ George A. Duarte
                                        ----------------------------------------
                                        Name:  George A. Duarte
                                        Title: Attorney-in-Fact

                                   By:  /s/ Marc Unger
                                        ----------------------------------------
                                        Name:  Marc Unger
                                        Title: Attorney-in-Fact

                                   INTERNATIONAL TECHNOLOGY
                                   INVESTMENTS, LC

                                   By:  /s/ Michael Shalom
                                        ----------------------------------------
                                        Name:  Michael Shalom
                                        Title: Manager

                                      18
<PAGE>

                                        /s/ Joel Eidelstein
                                        ----------------------------------------
                                        Joel Eidelstein

                                        /s/ Lee S. Casty
                                        ----------------------------------------
                                        Lee S. Casty

                                        /s/ Michael Shalom
                                        ----------------------------------------
                                        Michael Shalom

The provisions of Section
5.14 of this Agreement are
hereby acknowledged and agreed to.

EMERGING NETWORKS, INC.

By:  /s/ Joel Eidelstein
     --------------------------------
     Name:  Joel Eidelstein
     Title: President

                                      19
<PAGE>

                                   EXHIBIT A
                                   ---------

                                 PLEDGES BY ITI

     1.   Control or Restricted (Rule 144) Stock Borrower's Agreement (undated)
          between Donaldson Lufkin & Jenrette Securities Corporation ("DLJ"),
          and International Technology Investments, L.C. ("ITI"), whereby ITI
          pledges to DLJ  3,750,000 shares of IFX Corporation"s Common Stock
          which ITI owns of record.

     2.   Hypothecation Agreement between Scotiabank (Cayman Islands) Ltd. and
          International Technology Investments, L.C. ("ITI"), dated September
          12, 1999, and related documents, whereby ITI pledges to Scotiabank
          750,000 shares of IFX Corporation's Common Stock which ITI owns of
          record.

     3.   We were advised by IFX Corporation that there is a third pledge
          agreement between Crenshire Capital, L.P. ("Crenshire"), and
          International Technology Investments, L.C. ("ITI"), dated
          approximately, March 24, 2000, whereby ITI pledges to Crenshire
          1,500,000 shares of IFX Corporation's Common Stock which ITI owns of
          record.

                                      20<PAGE>

                                                                    Exhibit 10.2
                                                                    ------------

                     _____________________________________

                                IFX CORPORATION

                              PURCHASE AGREEMENT

                     Series A Convertible Preferred Stock

                     _____________________________________

                            Dated as of June 15, 2000
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<S>                                                                                                     <C>
1.   Authorization of the Securities; Nature of Agreement............................................    1

  (a)   Series A Preferred Stock.....................................................................    1

  (b)   Nature of Agreement..........................................................................    2

2.   Initial Sale and Purchase of Series A Preferred Stock...........................................    2

3.   Subsequent Sale and Purchase of Preferred Stock.................................................    2

4.   Representations and Warranties of the Company...................................................    3

  (a)   Organization and Good Standing...............................................................    3

  (b)   Authorization................................................................................    4

  (c)   Capital Stock................................................................................    4

  (d)   Subsidiaries.................................................................................    6

  (e)   Compliance With Material Instruments.........................................................    6

  (f)   Good Title...................................................................................    7

  (g)   Litigation...................................................................................    7

  (h)   Tax Matters..................................................................................    7

  (i)   Registration Rights..........................................................................    8

  (j)   Offering.....................................................................................    8

  (k)   Insurance....................................................................................    8

  (l)   Certain Transactions.........................................................................    8

  (m)   Contracts....................................................................................    9

  (n)   Governmental Consents........................................................................   11

  (o)   Officers, Employees and Labor................................................................   11

  (p)   Compliance with Laws.........................................................................   13

  (q)   Intellectual Property........................................................................   13

  (r)   Environmental Matters........................................................................   14

  (s)   Certain Practices............................................................................   14

  (t)   Brokers......................................................................................   15

  (u)   No Undisclosed Liabilities...................................................................   15

  (v)   Disclosure...................................................................................   15

  (w)   SEC Filings..................................................................................   15

  (x)   Financial Statements.........................................................................   16
</TABLE>

                                       i
<PAGE>

<TABLE>
<S>                                                                                                     <C>
  (y)   Availability and Transfer of Foreign Currency................................................   16

  (z)   Absence of Changes...........................................................................   16

  (aa)  Real Property Holding Company................................................................   18

  (bb)     Investment Company Act....................................................................   18

  (cc)  Subchapter S.................................................................................   18

  (dd)     State Takeover Statutes...................................................................   18

5.   Representations and Warranties of the Purchasers................................................   18

  (a)   Investment Intent............................................................................   18

  (b)   Sophistication...............................................................................   18

  (c)   Illiquidity..................................................................................   18

  (d)   Accredited Investor..........................................................................   19

  (e)   Brokers......................................................................................   19

  (f)   Requisite Power and Authority................................................................   19

  (g)   No Conflict..................................................................................   19

6.   Covenants.......................................................................................   19

  (a)   Pre-Closing Actions..........................................................................   19

  (b)   Compliance with the Hart-Scott-Rodino Antitrust Improvements Act of 1976.....................   20

  (c)   Covenants Pending Subsequent Closing.........................................................   20

  (d)   No Solicitation..............................................................................   20

  (e)   Books and Records............................................................................   21

  (f)   Post-Closing Covenants.......................................................................   21

  (g)   Inspection Rights............................................................................   22

7.   Conditions to Obligations of the Purchasers.....................................................   22

  (a)   Representations and Warranties...............................................................   22

  (b)   Performance..................................................................................   23

  (c)   Absence of Litigation........................................................................   23

  (d)   Opinion of Counsel to the Company and Subsidiaries...........................................   23

  (e)   Consents.....................................................................................   23

  (f)   Assignment of Intellectual Property..........................................................   23

  (g)   Contemporaneous Transactions.................................................................   23

  (h)   Closing Papers...............................................................................   24

  (i)   Absence of Material Adverse Effect...........................................................   25
</TABLE>

                                      ii
<PAGE>

<TABLE>
<S>                                                                                                     <C>
  (j)   Proceedings..................................................................................   25

  (k)   Legends......................................................................................   25

  (l)   Private Equity Fee...........................................................................   25

  (m)   HSR Approval.................................................................................   25

8.   Conditions to the Obligations of the Company....................................................   25

  (a)   Representations and Warranties...............................................................   25

  (b)   Performance..................................................................................   25

  (c)   HSR Approval.................................................................................   25

9.   Survival........................................................................................   26

10.  Termination.....................................................................................   26

11.  Effect of Termination...........................................................................   26

12.  Miscellaneous Provisions........................................................................   26

  (a)   Acknowledgment...............................................................................   26

  (b)   Notices......................................................................................   27

  (c)   Severability.................................................................................   27

  (d)   Governing Law................................................................................   27

  (e)   Publicity....................................................................................   28

  (f)   Captions and Section Headings................................................................   28

  (g)   Amendments and Waivers.......................................................................   28

  (h)   Successors and Assigns.......................................................................   28

  (i)   Expenses.....................................................................................   29

  (j)   Entire Agreement.............................................................................   29

  (k)   Exhibits.....................................................................................   29

  (l)   Further Assurances...........................................................................   29

  (m)   Condition to Effectiveness...................................................................   29

  (n)   Counterparts.................................................................................   29

  (o)   Attorneys' Fees..............................................................................   29

  (p)   Disclosure Generally.........................................................................   29

13.  Definitions.....................................................................................   30

  (a)   Definitions..................................................................................   30

  (b)   Other Definitional Provisions................................................................   35
</TABLE>

                                      iii
<PAGE>

                                    EXHIBITS

<TABLE>
<S>                                                                          <C>
EXHIBIT A      SCHEDULE OF PURCHASERS......................................  A-1

EXHIBIT B      CERTIFICATE OF DESIGNATION,
               PREFERENCES AND RIGHTS OF SERIES
               A PREFERRED STOCK OF IFX CORPORATION.......................   B-1

EXHIBIT C      SCHEDULE OF EXCEPTIONS.....................................   C-1

EXHIBIT D      FORM OF OPINION OF COMPANY COUNSEL.........................   D-1

EXHIBIT E      FORM OF STOCKHOLDERS AGREEMENT.............................   E-1

EXHIBIT F      FORM OF REGISTRATION RIGHTS AGREEMENT......................   F-1

EXHIBIT G      FORM OF COMMITMENT LETTER..................................   G-1
</TABLE>

                                      iv
<PAGE>

                                IFX CORPORATION

                              PURCHASE AGREEMENT

     This Purchase Agreement is made and entered into as of the 15 day of June,
2000, by and among IFX Corporation, a Delaware corporation (the "Company"), and
                                                                 -------
each Person listed on the Schedule of Purchasers attached as Exhibit A hereto
                                                             ---------
(the "Schedule of Purchasers") who executes this Agreement as a Purchaser (such
      ----------------------
Persons are referred to in this Agreement, collectively, as the "Purchasers" and
                                                                 ----------
individually, as a "Purchaser"). Unless defined elsewhere herein, capitalized
                    ---------
and other defined terms shall have the meanings specified in Section 13.
                                                             ----------

                                   RECITALS

     The Company desires to sell to the Purchasers, and the Purchasers desire to
purchase from the Company such number of shares of the Series A Convertible
Preferred Stock determined in accordance with Section 2 and 3 hereof for a total
aggregate purchase price for all shares of Series A Preferred Stock purchased
hereunder equal to Twenty Five Million Dollars ($25,000,000) to be purchased in
two installments consisting of an initial investment of $14,900,000 (the
"Initial Share Aggregate Purchase Price") at the Initial Closing (as defined
below) and, subject to the terms and conditions herein, an additional investment
of $10,100,000 (the "Additional Share Aggregate Purchase Price") at the
Subsequent Closing (as defined below). The shares will constitute one hundred
percent (100%) of all the issued and outstanding shares of the Series A
Preferred Stock of the Company as of the date of the final closing thereof, all
on the terms and conditions set forth herein.

                                   AGREEMENT

     In consideration of the premises and the mutual covenants, agreements,
hereinafter set forth, the parties to this Agreement agree as follows:

     1.   Authorization of the Securities; Nature of Agreement.
          ----------------------------------------------------

          (a)  Series A Preferred Stock. The Company has authorized the issuance
               ------------------------
and sale pursuant to the terms and conditions of this Agreement of up to
2,030,869 shares of its Preferred Stock, $1.00 par value per share, to be
designated as Class I Series A Convertible Preferred Stock ("Class I Preferred")
or Class II Series A Preferred Stock ("Class II Preferred" and together with the
Class I Preferred, the "Series A Preferred Stock"), as provided herein. The
shares of Series A Preferred Stock have all of the rights, preferences,
privileges and restrictions set forth in the Certificate of Designation, Number,
Powers, Preferences and Relative, Participating, Optional and Other Rights of
Series A Convertible Preferred Stock of IFX Corporation (the "Certificate"), a
copy of which, in the form to be filed with the Secretary of State of the State
of Delaware, is attached hereto as
<PAGE>

Exhibit B hereto. Upon issuance, Shares of Series A Preferred Stock shall be
---------
designated either Class I Preferred or Class II Preferred as provided in this
Agreement.

          (b)  Nature of Agreement. This Agreement insofar as it relates
               -------------------
to the purchase of a particular number of the Series A Preferred Stock by any
Purchaser is a separate agreement between that Purchaser and the Company. But
this Agreement insofar as it relates to the rights, duties and remedies of the
Company and the Purchasers, from and after the Closing, shall be deemed to be
one Agreement.

     2.   Initial Sale and Purchase of Series A Preferred Stock. Subject to the
          -----------------------------------------------------
terms and conditions set forth in this Agreement, the Company agrees to sell to
the Purchasers, and each of the Purchasers severally and not jointly agrees to
purchase from the Company, the number of shares of Class I Preferred indicated
as the Initial Shares opposite such Purchaser's name on the Schedule of
Purchasers (the "Initial Shares") for a purchase price of Twelve and 31/00
Dollars ($12.31) per share (the "Initial Per Share Price"). The initial sale and
purchase of the Series A Preferred Stock shall take place at the offices of
Kaye, Scholer, Fierman, Hays & Handler, LLP, 425 Park Avenue, New York, New York
10022, at 10:00 a.m., New York City time, at a closing (the "Initial Closing")
on the date hereof. At the Initial Closing, the Company will deliver to each
Purchaser the Series A Preferred Stock to be purchased by such Purchasers in the
form of a single certificate (or such greater number of certificates
representing such shares as such Purchaser may request), each dated the date of
the Initial Closing and registered in such Purchaser's name (or in the name of
such Purchaser's nominee(s)), against delivery by such Purchaser to the Company
or its order of immediately available funds in the amount of the purchase price
for such shares of Series A Preferred Stock. If at the Initial Closing, the
Company shall fail to tender to any Purchaser the Series A Preferred Stock to be
purchased by such Purchasers, or any of the conditions specified in Section 7
shall not have been fulfilled to the satisfaction of such Purchaser, such
Purchaser shall, at its election, be relieved of all further obligations under
this Agreement, without thereby waiving any other rights such Purchaser may have
by reason of such failure or such nonfulfillment.

     3.   Subsequent Sale and Purchase of Preferred Stock. Subject to the terms
          -----------------------------------------------
and conditions set forth in this Agreement, including, among other things,
receipt of HSR Approval, the Company agrees to sell to the Purchasers, and each
of the Purchasers severally and not jointly agrees to purchase from the Company,
such Purchaser's pro rata portion (based on the number of Initial Shares
purchased) of the number of shares of Class II Preferred (the "Additional
Shares") and for a per share price (the "Closing Per Share Price") determined as
follows:

          (a)  If the Average Closing Price (as defined below) is less than or
equal to the Initial Per Share Price, then (i) the Closing Per Share Price shall
equal the Initial Per Share Price and (ii) the total number of Additional Shares
shall equal the Additional Share Aggregate Purchase Price divided by such
Closing Per Share Price.

                                      -2-
<PAGE>

          (b)  If the Average Closing Price is greater than the Initial Per
Share Price but less than $14.29, then (i) the Closing Per Share Price shall
equal the Average Closing Price and (ii) the total number of Additional Shares
shall equal the Additional Share Aggregate Purchase Price divided by such
Closing Per Share Price.

          (c)  If the Average Closing Price is greater than or equal to $14.29,
then (i) the Closing Per Share Price shall equal $18.74 and (ii) the total
number of Additional Shares shall equal 539,077 such that the weighted average
price per share of all shares purchased of the Initial Closing and the
Subsequent Closing shall be $14.29.

          (d)  The "Average Closing Price" shall mean the average of the closing
prices per share of the Common Stock as reported on the NASDAQ Small Cap Market
and published in The Wall Street Journal for the period of five (5) consecutive
                 -----------------------
trading days ending with (and including) the trading day immediately preceding
the Subsequent Closing.

          The purchase and sale of such Additional Shares shall take place at
the offices of Kaye, Scholer, Fierman, Hays & Handler, LLP, 425 Park Avenue, New
York, New York 10022, at 10:00 a.m. New York City time, at a closing (the
"Subsequent Closing" and together with the Initial Closing, each a "Closing") to
be held as soon as practicable, but not more than ten (10) business days,
following receipt of HSR Approval. At the Subsequent Closing, the Company will
deliver to each Purchaser the Series A Preferred Stock to be purchased by such
Purchasers in the form of a single certificate (or such greater number of
certificates representing such shares as such Purchaser may request), each dated
the date of the Subsequent Closing and registered in such Purchaser's name (or
in the name of such Purchaser's nominee(s)), against delivery by such Purchaser
to the Company or its order of immediately available funds in the amount of the
purchase price for such shares of Series A Preferred Stock. If at the Subsequent
Closing, the Company shall fail to tender to any Purchaser the Series A
Preferred Stock to be purchased by such Purchasers, or any of the conditions
specified in Section 7 shall not have been fulfilled to the satisfaction of such
Purchaser, such Purchaser shall, at its election, be relieved of all further
obligations under this Agreement, without thereby waiving any other rights such
Purchaser may have be reason of such failure or such nonfulfillment.

     4.   Representations and Warranties of the Company. Subject to the
          ---------------------------------------------
exceptions set forth in the Schedule of Exceptions attached as Exhibit C hereto
                                                               ---------
(the "Schedule of Exceptions"), the Company represents and warrants to each of
the Purchasers that:

          (a)  Organization and Good Standing.
               ------------------------------

               (i)    The Company and each of its Subsidiaries is an entity duly
organized and validly existing under and by virtue of the laws of its state or
country of incorporation and is in good standing under such laws (to the extent
the concept of good standing is recognized under the laws of such
jurisdictions). The Company and each of its Subsidiaries is qualified, licensed
or domesticated as a foreign corporation in all

                                      -3-
<PAGE>

jurisdictions where the failure to be so qualified, licensed or domesticated
would have a Material Adverse Effect. The Company and each of its Subsidiaries
has full power and authority (corporate and other) to own, lease and operate its
properties and assets and to operate the Business as currently being operated.

               (ii)   Except as set forth on the Schedule of Exceptions, the
 minute books of the Company and each of its Subsidiaries, as previously made
 available to the Purchasers, contain accurate records of all meetings of and
 resolutions of, or written consents by, its shareholders and its board of
 directors (or committees thereof) since the date of its incorporation.

          (b)  Authorization. The Company has all requisite right, power and
               -------------
authority (corporate or otherwise) to execute and deliver this Agreement and
each of the other agreements and instruments referred to herein to be entered
into by the Company at or prior to a Closing (including the Certificate) in
connection with the consummation of the transactions contemplated by this
Agreement (the "Other Agreements") and to perform its obligations and consummate
all of the transactions contemplated hereunder and thereunder, including the
sale and issuance of the shares of Series A Preferred Stock to be purchased by
each Purchaser at the Initial Closing and Subsequent Closing. All corporate
proceedings have been taken and all corporate authorizations have been secured
which are necessary on the part of the Company and each of its Subsidiaries to
authorize the execution, delivery and performance of this Agreement and each of
the Other Agreements.

               (i)    This Agreement has been duly executed and delivered and
 constitutes, and each of the Other Agreements when executed and delivered by
 the Company, will constitute, legal, valid and binding obligations of the
 Company, enforceable in accordance with their respective terms, subject to
 applicable bankruptcy, insolvency or other similar laws affecting the
 enforceability of creditors' rights generally and court decisions with respect
 thereto, and the discretion of courts in granting equitable remedies.

               (ii)   The shares of the Series A Preferred Stock to be purchased
 by each Purchaser at the Initial Closing and Subsequent Closing have been duly
 authorized and, when delivered, will be duly and validly issued and
 outstanding, fully paid and nonassessable, and will be free of Encumbrances.
 The Common Stock of the Company issuable upon conversion of the Series A
 Preferred Stock (the "Conversion Shares") (i) has been duly authorized, (ii)
 has been reserved for issuance upon conversion of the Series A Preferred Stock,
 and (iii) when issued, will be duly and validly issued and outstanding, fully
 paid and nonassessable and will be free of Encumbrances.

          (c)  Capital Stock.
               -------------

               (i)  (A) On the date hereof, the authorized capital stock of the
Company consists of (1) 50,000,000 shares of Common Stock, par value $.02 per
share (the "Common Stock"), of which 13,296,455 shares of Common Stock are
            ------------
issued and

                                      -4-
<PAGE>

outstanding, and (2) 10,000,000 shares of Preferred Stock, par value $1.00 per
share (the "Preferred Stock"), of which 2,030,869 shares of Preferred Stock will
            ---------------
have been designated Series A Preferred Stock and none of which shares of
Preferred Stock are issued and outstanding; and (B) immediately after the
Initial Closing, the authorized capital of the Company will consist of (1)
50,000,000 shares of Common Stock, of which 13,296,455 shares of Common Stock
will be issued and outstanding, and (2) 10,000,000 shares of Preferred Stock, of
which 2,030,869 shares of Preferred Stock will have been designated Series A
Preferred Stock and of which 1,210,398 shares of Series A Preferred Stock will
be issued and outstanding.

               (ii)   Except as set forth in the Schedule of Exceptions, the
Company has not (A) issued or granted, (B) agreed to issue or grant, or (C)
caused or permitted any of its Subsidiaries to issue or grant, any option,
warrant, right or other Convertible Security which affords any Person the right
to purchase or otherwise acquire any shares of the Common Stock or the Series A
Preferred Stock, or any other security of the Company or any of its
Subsidiaries. Neither the Company nor any of its Subsidiaries is subject to any
obligation (contingent or otherwise) to purchase or otherwise acquire or retire
any shares of its securities.

               (iii)  All of the issued and outstanding securities of the
Company and its Subsidiaries have been duly authorized and validly issued, are
fully paid, nonassessable and free of preemptive rights (other than those
preemptive rights set forth in the Schedule of Exceptions) and other
Encumbrances, and were issued in compliance with all Applicable Laws, including
those regulating the offer, sale or issuance of securities.

               (iv)   Except as set forth in the Schedule of Exceptions, no
Person has any rights of first refusal or similar rights or any preemptive
rights in connection with the issuance of the shares of Series A Preferred Stock
or Conversion Shares, or with respect to any future offer, sale or issuance of
securities by the Company, any of its Subsidiaries or any of its stockholders,
other than as provided in this Agreement or after the Closings, the Registration
Rights Agreement, the Stockholders Agreement or the Certificate.

               (v)    The Schedule of Exceptions sets forth a true and correct
 list of (1) to the knowledge of the Company, each of the Company's shareholders
 who owns, of record or beneficially, more than 5% of the Common Stock on a
 Fully Diluted Basis, indicating the number and class of shares owned by each
 shareholder, and such shareholder's percentage interest in the Company and
 percentage interest in the Common Stock on a Fully Diluted Basis, and (2) each
 of the holders of Convertible Securities, the number and type of Convertible
 Securities owned by such holder and to the knowledge of the Company, such
 holder's percentage interest in the Company and percentage interest in the
 Common Stock on a Fully Diluted Basis.

               (vi)   True and correct copies of all documents relating to the
issuance and terms of all outstanding shares of capital stock and other equity
securities of

                                      -5-
<PAGE>

the Company and all Convertible Securities of the Company issued after November
10, 1998 have been provided to the Purchasers. Except as set forth in the
Schedule of Exceptions, each option issued to purchase capital stock or other
equity securities of the Company granted under the Stock Option Plan or
otherwise was granted pursuant to an option agreement in substantially the form
provided to the Purchasers.

          (d)  Subsidiaries.
               ------------

               (i)    The name of each Subsidiary of the Company, the
jurisdiction of its incorporation and the ownership of capital stock of its
shareholders are listed in the Schedule of Exceptions. Except as set forth on
the Schedule of Exceptions, all of the issued and outstanding shares of capital
stock of each Subsidiary are 100% owned, beneficially and of record, by the
Company (other than a single share (if any) of such Subsidiary held by a nominee
of the Company in order to comply with Applicable Law), are validly issued,
fully paid and nonassessable, and free from Encumbrances.

               (ii)   Except for the capital stock or other securities of the
Subsidiaries listed on the Schedule of Exceptions, the Company does not own,
directly or indirectly, beneficially or of record, or have any obligations to
purchase or otherwise acquire, any capital stock or other securities of any
Person. Except as set forth on the Schedule of Exceptions, none of the
Subsidiaries owns, directly or indirectly, beneficially or of record, or has any
obligation to acquire any capital stock or other securities of any Person.

          (e)  Compliance With Material Instruments. Except as set forth on the
               ------------------------------------
Schedule of Exceptions, the Company and each Subsidiary is not in violation of
(i) any Applicable Law, (ii) any term of its Certificate of Incorporation or
Bylaws (or equivalent documents in its jurisdiction of organization), or (iii)
any Contract to which it is subject and which is material to the Business
(collectively, the "Material Instruments"). The execution and delivery by the
Company of this Agreement and the Other Agreements, the performance by the
Company of its obligations hereunder and thereunder and the consummation by the
Company of the transactions contemplated hereby and thereby, including the
issuance and sale of the Series A Preferred Stock, the issuance of the
Conversion Shares and the taking of any other action contemplated by this
Agreement or the Other Agreements, will not (i) result in (A) any violation of
any Applicable Law, or (B) any violation of any term of the Company's or any of
its Subsidiaries' Certificate of Incorporation or Bylaws (or equivalent
documents), or (C) any violation of or any conflict with or a default (with or
without notice, lapse of time or both) under any of the Material Instruments,
which violation, conflict or default might reasonably be expected to materially
adversely affect the ability of the Company or any of its Subsidiaries to
satisfy its obligations under this Agreement, any of the Other Agreements or any
of the Material Instruments, (ii) accelerate or constitute an event entitling
the holder of any indebtedness of the Company or any of its Subsidiaries to
accelerate the maturity of any such indebtedness or to increase the rate of
interest presently in effect with respect to such indebtedness, or (iii) result
in the creation of any Encumbrance upon any of the material

                                      -6-
<PAGE>

properties or assets of the Company or any of its Subsidiaries. The performance
by the Company or any of its Subsidiaries of its obligations and the enforcement
of its rights under the Material Instruments will not have a Material Adverse
Effect.

          (f)  Good Title. Except as set forth on the Schedule of Exceptions,
               ----------
the Company and each of its Subsidiaries has good title to, a valid license to,
or a valid leasehold interest in, the properties and assets used by it, in each
case free and clear of all Encumbrances, except liens for current property taxes
not yet due and payable and any immaterial workmen's, repairmen's,
warehouseman's and carriers' liens arising in the ordinary course of business.
The buildings, equipment and other tangible assets of the Company and each of
its Subsidiaries are in all material respects in good operating condition and
repair, free from any known defects and are usable in the ordinary course of the
Business; and the Company and each of its Subsidiaries owns, or has a valid
leasehold interest in or license to use, all assets necessary for the conduct of
the Business as presently conducted.

          (g)  Litigation.
               ----------

               (i)    Except as set forth on the Schedule of Exceptions, there
are no actions, proceedings, investigations (civil, criminal, regulatory or
otherwise), arbitrations, claims, demands or grievances ("Actions") pending
                                                          -------
against the Company or any Subsidiary (or, to the best knowledge of the Company,
any basis therefor or threat thereof).

               (ii)   There are no judgments unsatisfied against the Company or
 any Subsidiary or consent decrees or injunctions to which the Company, any
 Subsidiary or any assets of the Business are subject.

          (h)  Tax Matters. Except as set forth in the Schedule of Exceptions,
               -----------
the Company and each of its Subsidiaries (i) has timely filed (including
extensions) all Tax returns that are required to have been filed by it with all
appropriate Governmental Authorities (and all such Tax returns are true,
complete and correct in all material respects), (ii) has timely paid all Taxes
owed by it or withheld and remitted to the appropriate Governmental Authority
all Taxes which it is obligated to withhold and remit from amounts owing to any
employee (including social security taxes), creditor, customer or third party,
and (iii) has not waived any statute of limitations with respect to Taxes or
agreed to any extension of time with respect to a Tax assessment or deficiency.
The assessment of any additional Taxes for periods for which returns have been
filed is not expected to exceed the recorded liability therefor, and there are
no material unresolved questions or claims concerning the Tax liability of the
Company or any Subsidiary. There is no pending dispute with, or notice from, any
taxing authority relating to any of the Tax returns which, if determined
adversely to the Company or any Subsidiary, would result in the assertion by any
taxing authority of any valid deficiency in a material amount for Taxes, and to
the knowledge of the Company, there is no proposed liability for a deficiency in
any Tax to be imposed upon the properties or assets of the Company, the

                                      -7-
<PAGE>

Business or any Subsidiary. There are no federal, state, local or foreign Tax
Encumbrances on any asset of the Company, the Business or any Subsidiary (other
than Encumbrances for Taxes not yet due and payable).

          (i)  Registration Rights. Except as set forth in the Schedule of
               -------------------
Exceptions and the Registration Rights Agreement, the Company is not a party to
any agreement or commitment which obligates the Company to register under the
Securities Act of 1933, as amended (the "Securities Act"), or any other
securities law of any jurisdiction, any of its presently outstanding securities
or any of its securities which may hereafter be issued.

          (j)  Offering. Subject to the accuracy of the Purchasers'
               --------
representations in Section 5 of this Agreement, the offer, issuance and sale of
the Series A Preferred Stock and the Conversion Shares constitute, and will
constitute, transactions exempt from the registration and prospectus delivery
requirements of Section 5 of the Securities Act and analogous provisions of the
Applicable Laws of all other jurisdictions, and the Company has obtained (or is
exempt from the requirement to obtain) all qualifications, permits and other
consents required by all Applicable Laws governing the offer, sale or issuance
of securities.

          (k)  Insurance. The Schedule of Exceptions contains a true, complete
               ---------
and correct list of all insurance policies covering the Business and the
respective material assets of the Company and each Subsidiary. The Company and
each Subsidiary maintains in full force and effect such insurance policies.
Neither the Company nor any Subsidiary is in default with respect to any
provision contained in any insurance policy. Neither the Company nor any
Subsidiary has failed to give any notice under any insurance policy in due time.

          (l)  Certain Transactions. Except as set forth in the Schedule of
               --------------------
Exceptions, neither the Company nor any of its Subsidiaries is indebted, either
directly or indirectly, to any of the officers, directors, advisory board
members or stockholders of the Company or any Subsidiary, or to any Affiliates
of the foregoing, in any amount whatsoever, other than for payment of salary for
services rendered and reasonable expenses; except as set forth on the Schedule
of Exceptions, none of said officers, directors, advisory board members,
stockholders and their respective Affiliates are indebted to the Company or any
Subsidiary or, to the knowledge of the Company, have any direct or indirect
ownership interest in, or any contractual relationship with, any Affiliates of
the Company or any Subsidiary or with any Person with which the Company or any
Subsidiary has a business relationship, or any Person which, directly or
indirectly, competes with the Company or any Subsidiary. Except as set forth in
the Schedule of Exceptions, no such officer, director, advisory board member or
stockholder, nor any of their respective Affiliates, is, directly or indirectly,
a party to or otherwise an interested party with respect to any contract,
agreement, arrangement or understanding with the Company or any Subsidiary other
than agreements for the issuance of stock options to any such Person under the
Stock Option Plan.

                                      -8-
<PAGE>

          (m)  Contracts.
               ---------

               (i)    Except as expressly contemplated by this Agreement, or as
set forth in the Schedule of Exceptions, the Company and each of its
Subsidiaries is not, and as of each of the Closings the Company and each of its
Subsidiaries will not be, a party to, or bound by, and none of their respective
assets is or will be subject to, any written or oral agreement, contract,
commitment, order, license, lease or other instrument and arrangement of the
types described below (the "Contracts"):

                      (A)  any pension, profit sharing, stock option, employee
          stock purchase or other plan providing for deferred, incentive or
          other compensation to employees, any other employee benefit plan, or
          any contract with any labor union;

                      (B)  any contract for the employment or personal services
          of any officer, individual employee or other person or entity on a
          full-time, part-time, consulting, advisory or other basis providing
          annual compensation in excess of $125,000 or which, in any way,
          restricts or limits the right of the Company or any Subsidiary to
          terminate such contract at will;

                      (C)  any loan agreement, indenture, letter of credit,
          security agreement, mortgage, pledge agreement, deed of trust, bond,
          note, or other agreement relating to the borrowing of money in excess
          of $125,000 or to the mortgaging, pledging, transferring of a security
          interest, or otherwise placing an Encumbrance on any material asset or
          material group of assets (whether tangible or intangible) of the
          Company or any Subsidiary;

                      (D)  any guarantee of the payment or performance of any
          Person in excess of $125,000; any agreement to indemnify any Person or
          act as a surety for an amount in excess of $125,000; any other
          agreement to be contingently or secondarily liable for the obligations
          of any Person; or any "keep well" or similar credit support
          arrangements;

                      (E)  any lease or agreement under which it is the lessee
          of or holds or operates any property, real or personal, owned by any
          other party requiring annual payments in excess of $125,000;

                      (F)  any contract or agreement or group of related
          agreements with the same party or any group of affiliated parties
          which requires or may in the future require an aggregate payment by or
          to the Company or any Subsidiary in excess of $125,000;

                                      -9-
<PAGE>

                      (G)  any contract or agreement prohibiting it from freely
          engaging in any business or competing anywhere in the world;

                      (H)  any material licenses, licensing arrangements and
          other similar contracts providing in whole or in part for the use by a
          third party of, or limiting the use by the Company or any Subsidiary
          of, any Intellectual Property;

                      (I)  any brokerage or finder's agreements relating to this
          Transaction;

                      (J)  any joint venture, partnership and similar contracts
          involving a sharing of profits or expenses (including joint
          development and joint marketing contracts);

                      (K)  any asset purchase agreements, stock purchase
          agreements and other acquisition or divestiture agreements, including
          any agreements relating to the sale, lease or disposal of any assets
          of the Company or any of its Subsidiaries for consideration in excess
          of $50,000 or involving continuing indemnity or other obligations;

                      (L)  any material sales agency, marketing or
          distributorship agreements;

                      (M)  any contracts which contain "take or pay" provisions;

                      (N)  [Intentionally omitted];

                      (O)  any contracts, agreements or arrangements regarding
          pre-emptive rights, rights of first refusal, put or call rights or
          obligations, anti-dilution rights or other restrictions on or with
          respect to the issuance, sale or redemption of the capital stock of
          the Company or any of its Subsidiaries;

                      (P)  any contracts, agreements or arrangements regarding
          the rights, obligations, restrictions on or with respect to the voting
          of any of the capital stock of the Company or any of its Subsidiaries
          or the registration of such stock for offering to the public pursuant
          to the Securities Act; and/or

                      (Q)  any other contract, agreement or commitment not the
          subject matter of clauses (A) through (P) above which is or could be
          reasonably expected to be material to the Company, any Subsidiary or
          the Business.

                                     -10-
<PAGE>

               (ii)   The Company and each of its Subsidiaries has performed all
obligations required to be performed by it to date and is not in material
default under, or in material breach of, or in receipt of any claim of material
default under or material breach of, any agreement to which it is a party or to
which any of its assets is subject; the Company has no present expectation or
intention of not fully performing, or of permitting any of its Subsidiaries not
to perform fully, all such obligations; and the Company does not have any
knowledge of any material breach or anticipated material breach by the other
parties to any contract or commitment to which it or any of its Subsidiaries is
a party or to which any of its or their assets is subject.

               (iii)  To the knowledge of the Company, none of the officers of
the Company or any Subsidiary is a party to any oral or written contract which
prohibits, restricts or limits his or her performance of his or her duties or
the fulfillment of his or her obligations as an employee and an officer of the
Company or any Subsidiary.

               (iv)   Each Contract is a legal, valid, binding and enforceable
obligation of the Company or a Subsidiary, and to the knowledge of the Company,
the other parties thereto, subject to applicable bankruptcy, insolvency, or
other similar laws affecting the enforceability of creditors' rights generally
and court decisions with respect thereto, and the discretion of courts in
granting equitable remedies. Except as set forth in the Schedule of Exceptions,
no Consent of any Person is required under any Contract as a result of or in
connection with the execution and delivery by the Company or any of its
Subsidiaries or the performance by the Company or any of its Subsidiaries of its
obligations hereunder or under any of the Other Agreements or the consummation
by the Company or any of its Subsidiaries of the transactions contemplated
hereby or thereby.

          (n)  Governmental Consents. Except with respect to HSR Approval, no
               ---------------------
Governmental Approvals or Consents are required to be obtained under Applicable
Law or the Certificate of Incorporation and By-Laws of the Company in connection
with (i) the execution, delivery or performance by the Company of this Agreement
or any of the Other Agreements or the consummation of any transaction
contemplated hereby or thereby, and (ii) the carrying on of the Business as it
is presently carried on and is contemplated to be carried on, except as have
been obtained or accomplished and except for immaterial Governmental Approvals
or Consents, except as set forth on the Schedule of Exceptions. All such
Governmental Approvals and Consents have been duly obtained or accomplished and
are in full force and effect and the Company and its Subsidiaries are in
compliance in all material respects with each such Governmental Approval and
Consent.

          (o)  Officers, Employees and Labor.
               -----------------------------

               (i)    Except as set forth in the Schedule of Exceptions, the
Company and each of its Subsidiaries has complied in all material respects with
all Applicable Laws relating to the employment of labor, including provisions
thereof relating to wages, hours, social welfare, equal opportunity and
collective bargaining. The Company does not have any material labor relations
problems. All the employment

                                     -11-
<PAGE>

agreements entered into between the Company or any Subsidiary, on the one hand,
and their respective employees, on the other hand, are in full force and effect.

               (ii)   The Schedule of Exceptions contains a list of all officers
of the Company and each of its Subsidiaries and all other current employees and
consultants whose current annual salary or rate of compensation (including
bonuses, commissions and inventive compensation) is $125,000 or more, together
with their current job titles or relationship to the Company or its
Subsidiaries. None of the Persons referred to above, nor any other employee or
consultant of the Company and its Subsidiaries, has notified the Company or such
Subsidiary that such Person will cancel or otherwise terminate such Person's
relationship with the Company or such Subsidiary, or is being terminated by the
Company or such Subsidiary.

               (iii)  To the Company's knowledge, none of the officers or
employees of the Company or any of its Subsidiaries is in breach of any covenant
or agreement with any previous employer or other Person with regard to (A)
restrictions on competition with the business of such previous employer or other
Person, (B) solicitation of the employees of such previous employer or other
Persons, or (C) non-disclosure of the confidential or proprietary information of
such previous employer or other Person.

               (iv)   Except as set forth on the Schedule of Exceptions, the
Company and its Subsidiaries do not have any Benefit Plans. The Company has
delivered to the Purchasers true, correct and complete copies of all documents,
summary plan descriptions, insurance contracts, third party administration
contracts and all other documentation created to embody all Benefit Plans, plus
descriptions of any Benefit Plans that have not been reduced to writing.

               (v)    Except as set forth on the Schedule of Exceptions and for
required contributions or benefit accruals for the current plan year, no
material liability has been or is expected to be incurred by the Company under
or pursuant to any Applicable Law relating to Benefit Plans and, to the best
knowledge of the Company, no event, transaction or condition has occurred or
exists that could result in any such liability to the Company or any of its
Subsidiaries or, following the Closing, the Company, its Subsidiaries, the
Purchasers or any such Benefit Plan.

               (vi)   Except as set forth on the Schedule of Exceptions, each of
the Benefit Plans listed in the Schedule of Exceptions is and has at all times
been in compliance in all material respects with all applicable provisions of
Applicable Laws.

               (vii)  Except as specifically set forth in the Schedule of
Exceptions, the execution and performance of the transactions contemplated by
this Agreement will not (either alone or upon the occurrence of any currently
planned additional or subsequent event) constitute an event under any Benefit
Plan or individual agreement that will or may result in any payment (whether of
severance pay or otherwise),

                                     -12-
<PAGE>

acceleration, vesting or increase in material benefits with respect to any
employee, former employee, consultant, agent or director of the Company or any
Subsidiary.

               (viii) With respect to all Benefit Plans which are funded, or are
required by Applicable Law to be funded, the present value of all accrued
benefits (vested and non-vested) of each such Benefit Plan as of the Closing
Date, will not exceed the fair market value of the assets of each such Benefit
Plan as of the Closing Date.

          (p)  Compliance with Laws. Except as set forth on the Schedule of
               --------------------
Exceptions, the Company and each of its Subsidiaries is not, in any material
respects, in violation of any Applicable Laws and has not received notice of any
such violation.

          (q)  Intellectual Property. Except as set forth in the Schedule of
               ---------------------
Exceptions, the Company owns free and clear of all Encumbrances, or possesses
and is validly licensed under, all Intellectual Property material to the
operation of the Business, as conducted in the past, as presently conducted and
as contemplated to be conducted. Any such licenses are in full force and effect.
No past, current, or planned activity, service or product of the Company or any
Subsidiary infringes or conflicts with the Intellectual Property of any third
party. The Company and its Subsidiaries have taken appropriate steps and
measures to establish and preserve ownership of or right to use all Intellectual
Property material to the operation of the Business. The Company owns all rights
in and to any and all Intellectual Property used or planned to be used by the
Company or any Subsidiary, or covering or embodied in any past, current or
planned activity, service or product of the Company or any Subsidiary, which
Intellectual Property was made, developed, conceived, created or written by any
consultant retained, or any employee employed, by the Company or any Subsidiary.
To the Company's knowledge, no former or current employee, and no former or
current consultant, of the Company or any Subsidiary has any rights in any
Intellectual Property made, developed, conceived, created or written by the
aforesaid employee or consultant during the period of his retention by the
Company or the Subsidiary which can be asserted against the Company or any
Subsidiary. The Company owns, or has full and unrestricted rights to use, any
and all domain names containing the word "Unete" and "Tutopia" (including the
word ""Unete" or "Tutopia" in combination with any non-military extension,
including Unete.com, Unete.net, Unete.org, Tutopia.com, Tutopia.net and
Tutopia.org). The domain names Unete.com and Tutopia.com, do not and will not
receive an amount of Internet traffic intended for any website or webpage of the
Company that would have a Material Adverse Effect. Except as set forth on the
Schedule of Exceptions, neither the Company nor any Subsidiary has knowledge of
any Intellectual Property owned by the Company or any Subsidiary and material to
the operation of the Business which is the subject of any Encumbrance or other
agreement granting rights therein to any third party. Except as set forth on the
Schedule of Exceptions, neither the Company nor any Subsidiary is obligated or
under any liability whatsoever to make any payments by way of royalties, fees or
otherwise to any owner, licensor of, or other claimant to, any Intellectual
Property, with respect to the use thereof or in connection with the conduct of
the Business, or otherwise. The Company and each of its Subsidiaries has taken
reasonable steps to protect, maintain and safeguard the

                                     -13-
<PAGE>

Intellectual Property material to the Business, including any Intellectual
Property for which improper or unauthorized disclosure would impair its value or
validity, and has executed and has had executed appropriate nondisclosure and
confidentiality agreements and made all appropriate filings and registrations in
connection with the foregoing. Neither the Company nor any Subsidiary has
knowledge of any infringement by any third party of any Intellectual Property of
the Company or any Subsidiary. There has been no judgment, decree, injunction,
rule, or order rendered by any Governmental Authority, and no claim made against
the Company or any Subsidiary, asserting the invalidity, abuse, misuse or
unenforceability of any Intellectual Property material to the operation of the
Business, or that would limit, cancel, or question the validity of, or the
rights of the Company or any Subsidiary in, any Intellectual Property material
to the operation of the Business.

          (r)  Environmental Matters.
               ---------------------

               (i)    The Company has compiled in all material respects with all
applicable Environmental Laws. There is no pending or, to the knowledge of the
Company, threatened civil or criminal litigation, written notice of violation,
formal administrative proceeding, or investigation, inquiry or information
request by any Governmental Authority, relating to any Environmental Law
involving the Company or any of its Subsidiaries.

               (ii)   Neither the Company, nor to the knowledge of the Company,
any third party has released any Materials of Environmental Concern into the
environment at any parcel of real property or any facility formerly or currently
owned, leased, operated or controlled by the Company. The Company is not aware
of any releases of Materials of Environmental Concern at parcels of real
property or facilities other than those owned, leased, operated or controlled by
the Company that could reasonably be expected to have an impact on the real
property or facilities owned, leased, operated or controlled by the Company.

               (iii)  Set forth in the Schedule of Exceptions is a list of all
environmental reports, investigations and audits of which the Company is aware
(whether conducted by or on behalf of the Company or a third party, and whether
done at the initiative of the Company or directed by a Governmental Authority or
other third party) issued or conducted during the five years preceding the date
hereof relating to premises currently or previously owned, leased or operated by
the Company or any of its Subsidiaries. Complete and accurate copies of each
such report, or the results of each such investigation or audit, have been
provided to the Purchasers.

          (s)  Certain Practices. Neither the Company nor any Subsidiary (nor
               -----------------
any constituent corporation of any merger of which the Company or any Subsidiary
is a surviving corporation, or other Person of which the Company or any
Subsidiary is the surviving corporation) nor any of their respective officers,
employees, directors, representatives or agents has, since the inception of the
Business by the Company or any of its Subsidiaries (or their predecessors): (i)
taken any action in furtherance of any boycott

                                     -14-
<PAGE>

not sanctioned by the United States; (ii) entered into any contract or agreement
to conduct any transaction with any Governmental Authority, agent,
representative or resident of, or any Person based or resident in, any of the
following countries: Angola (UNITA); Burma (Myanmar); Cuba; Iran; Iraq; Libya;
North Korea; Sudan; Syria; and the Federal Republic of Yugoslavia (Serbia and
Montenegro); or (iii) knowingly offered, promised, authorized or made, directly
or indirectly, (A) any unlawful payments under Applicable Laws, or (B) any
payments or other inducements (whether or not unlawful), to any government
official, including any official of an entity owned or controlled by a
government, political party or official thereof or any candidate for political
office, with the intent or purpose of: (1) influencing any act or decision of
such official in his official capacity; (2) inducing such official to do or omit
to do any act in violation of the lawful duty of such official; (3) receiving an
improper advantage; or (4) inducing such official to use his influence with a
Governmental Authority to affect or influence any act or decision of such
Governmental Authority; in order to assist the Company or any Subsidiary in
obtaining or retaining business for or with, or directing business to, any
person.

          (t)  Brokers. No finder, broker, agent, financial advisor or other
               -------
intermediary has acted on behalf of the Company or any of its Affiliates in
connection with the offering of the Series A Preferred Stock or the negotiation
or consummation of this Agreement or the Other Agreements or any of the
transactions contemplated hereby or thereby. All such negotiations or the
consummation of this Agreement or the Other Agreements or any of the
transactions contemplated hereby or thereby will not give rise to any valid
claim against the Company, any Subsidiary or any of the Purchasers for any
brokerage or finder's commission, fee or similar compensation.

          (u)  No Undisclosed Liabilities. Except as set forth on the Schedule
               --------------------------
of Exceptions or in the SEC Reports, neither the Company nor any Subsidiary has
any liabilities, obligations, claims, commitments or debts of any nature,
whether known or unknown, whether due or becoming due, or asserted or unasserted
(whether fixed, accrued, absolute, contingent, secured or otherwise). The
Schedule of Exceptions sets forth a true and complete schedule of accrued
liabilities and future payments due with respect to any acquisitions by the
Company or any Subsidiary of any equity securities or assets of any Person.

          (v)  Disclosure. This Agreement (including the Schedules and Exhibits
               ----------
hereto) does not contain any untrue statement of any material fact or omits to
state a material fact necessary in order to make the statements contained herein
or therein, in light of the circumstances under which they were made, not
misleading. To the Company's knowledge, there are no facts that, individually or
in the aggregate, would have a Material Adverse Effect that have not been set
forth in this Agreement (including the Schedule of Exceptions).

          (w)  SEC Filings. Since January 1, 1997, the Company has timely filed
               -----------
all forms, reports and documents with the SEC required to be filed by it
pursuant to the Federal securities laws and the rules and regulations of the SEC
thereunder, all of which

                                     -15-
<PAGE>

complied in all material respects with all applicable requirements of the
Securities Act and the Exchange Act and the rules and regulations of the SEC
thereunder. The above referenced forms, reports and documents of the Company are
sometimes collectively referred to herein as the "SEC Reports." A true and
complete list of the SEC Reports is set forth in the Schedule of Exceptions. All
documents required to be filed as exhibits to the SEC Reports have been timely
filed. None of the SEC Reports, including without limitation any financial
statements or schedules included therein, at the time filed contained any untrue
statement of a material fact or omitted to state a material fact required to be
stated therein or necessary in order to make the statements therein, in light of
the circumstances under which they were made, not misleading.

          (x)  Financial Statements. The consolidated balance sheets and the
               --------------------
related consolidated statements of income, stockholders' equity and cash flows
(including the related notes thereto) of the Company and its Subsidiaries
included in the SEC Reports complied as to form in all material respects with
the applicable accounting requirements and published rules and regulations of
the SEC with respect thereto, have been prepared in accordance with GAAP,
applied on a basis consistent with prior periods except as otherwise noted
therein, present fairly the consolidated financial position of the Company and
its Subsidiaries as of their respective dates, and the consolidated results of
their operations and their cash flows for the periods presented therein, and
reflect all adjustments necessary for the fair presentation of results for the
periods presented except as set forth on the Schedule of Exceptions.

          (y)  Availability and Transfer of Foreign Currency. All requisite
               ---------------------------------------------
foreign exchange control approvals and other authorizations, if any, by any
Governmental Authority have been validly obtained and are in full force and
effect to assure: (a) the ability of the Company and its Subsidiaries to make
any and all payments necessary to (i) each Purchaser for dividend payments on
the Common Stock and the Series A Preferred Stock, or (ii) any other party in
order to conduct the Business; (b) the ability of the Company's Subsidiaries to
make any and all payments of dividends and other distributions to the Company
and any and all other intercompany payments to or from the Company; and (c) the
availability of dollars to enable each Purchaser to convert its investment to
dollars, if necessary, if such Purchaser liquidates its investment in the Series
A Preferred Stock or the Common Stock.

          (z)  Absence of Changes.  Except as set forth in the Schedule of
               ------------------
Exceptions, since June 30, 1999, neither the Company nor any Subsidiary has:

               (i)    suffered any Material Adverse Effect;

               (ii)   incurred, assumed, guaranteed or discharged any debt,
claim, commitment, obligation or liability, absolute, accrued, contingent or
otherwise, whether due or to become due (including any indebtedness for borrowed
money), in excess of $100,000, individually or in the aggregate;

                                     -16-
<PAGE>

               (iii)  mortgaged, pledged or subjected to any other Encumbrance,
any material piece of property, business or assets, tangible or intangible;

               (iv)   sold, transferred, leased to others or otherwise disposed
of any of the assets of the Business, in excess of $100,000, individually or in
the aggregate, or canceled or compromised any debt, claim, commitment, liability
or obligation, or waived or released any right of substantial value, involving
an amount in excess of $100,000, individually or in the aggregate;

               (v)    received any written notice of termination of any Contract
with required payments thereunder in excess of $100,000; (vi) suffered any
damage, destruction or loss (whether or not covered by insurance) to property,
in excess of $100,000, individually or in the aggregate;

               (vii)  transferred or granted any rights under, or entered into
any settlement regarding the breach, misappropriation, infringement or violation
of, any Intellectual Property, or modified any existing rights with respect
thereto in a manner involving payments by or to the Business in excess of
$100,000, individually or $100,000 in the aggregate;

               (viii) with respect to amounts in excess of $25,000 per year,
made any change in the rate of compensation, commission, bonus or other direct
or indirect remuneration payable, or paid or agreed or made any enforceable oral
promise to pay, conditionally or otherwise, any bonus, incentive, retention or
other compensation, retirement, welfare, fringe or severance benefit or vacation
pay, to or in respect of any employee, distributor or agent;

               (ix)   made any change in its accounting, auditing or tax
methods, practices or principles;

               (x)    encountered any labor union organizing activity, had any
actual or threatened employee strikes, work stoppages, slowdowns or lockouts, or
had any material and adverse change in its relations with its employees,
distributors, agents, customers or suppliers;

               (xi)   entered into any Contract, involving an amount per year in
excess of $100,000, individually or in the aggregate, or paid or agreed to pay
any brokerage or finder's fee, or incurred any severance pay obligations by
reason of, this Agreement or any of the transactions contemplated hereby;

               (xii)  made any grant of credit to any customer or distributor on
terms or in amounts materially more favorable than had been extended to that
customer or distributor in the past; or

                                     -17-
<PAGE>

               (xiii) taken any action or omitted to take any action that has
resulted or could reasonably be expected to result in the occurrence of any of
the foregoing.

          (aa) Real Property Holding Company.  The Company is not a real
               -----------------------------
property holding company within the meaning of Section 897(c)(2) of the United
States Internal Revenue Code of 1986, as amended.

          (bb) Investment Company Act. The Company is not, nor is it directly or
               ----------------------
indirectly controlled by or acting on behalf of, any Person that is an
"investment company" within the meaning of the United States Investment Company
Act of 1940, as amended.

          (cc) Subchapter S. The Company has not elected to be treated as a
               ------------
Subchapter S corporation or a collapsible corporation pursuant to Section
1362(a) or Section 341(f) of the United States Internal Revenue Code of 1986, as
amended.

          (dd) State Takeover Statutes. The Board of Directors of the Company
               -----------------------
has approved this Agreement, the Other Agreements and the transactions
contemplated hereby and thereby and the provisions of any "fair price,"
"moratorium," "control share," "interested stockholders," "affiliated
transaction" or other anti-takeover statute or regulation, and any antitakeover
or other restrictive provisions of the Company's Certificate of Incorporation
are not applicable to the transactions contemplated by this Agreement or the
Other Agreements.

     5.   Representations and Warranties of the Purchasers.  Each Purchaser
          ------------------------------------------------
severally (and not jointly) represents and warrants to the Company that:

          (a)  Investment Intent. The shares of Series A Preferred Stock to be
               -----------------
purchased by and issued to the Purchaser pursuant to this Agreement are being
acquired by the Purchaser solely for its own account, for investment purposes
only, and with no present intention of distributing, selling or otherwise
disposing of them.

          (b)  Sophistication. Such Purchaser is able to bear the economic risk
               --------------
of an investment in shares of the Series A Preferred Stock to be purchased by it
pursuant to this Agreement and can afford to sustain a total loss of such
investment, and has such knowledge and experience in financial and business
matters that it is capable of evaluating the merits and risks of the proposed
investment and therefore has the capacity to protect its own interests in
connection with the purchase of its respective shares of Series A Preferred
Stock.

          (c)  Illiquidity. Such Purchaser understands that there is no public
               -----------
market for the shares of Series A Preferred Stock to be purchased by it and that
there may never be a public market for such stock, and that even if a market
develops for such stock such Purchaser may have to bear the risk of its
investment in such stock for a substantial period of time.

                                     -18-
<PAGE>

          (d)  Accredited Investor. Such Purchaser is an "accredited investor"
               -------------------
within the meaning of Regulation D promulgated under the Securities Act. In
addition (but without limiting the effect of the Company's representations and
warranties contained herein), such Purchaser has received such information as it
considers necessary or appropriate for deciding whether to purchase its
respective shares of Series A Preferred Stock.

          (e)  Brokers. No finder, broker, agent, financial advisor or other
               -------
intermediary has acted on behalf of such Purchaser in connection with the
transactions contemplated by this Agreement or the Other Agreements.

          (f)  Requisite Power and Authority. Each Purchaser has all necessary
               -----------------------------
power and authority to execute and deliver this Agreement and the Other
Agreements to which it is a party and to carry out their provisions. This
Agreement has been duly executed and delivered by each Purchaser, and each of
the Other Agreements when executed and delivered by each Purchaser who is a
party thereto, will constitute the legal, valid and binding obligations of such
Purchaser, enforceable in accordance with their terms, subject to applicable
bankruptcy, insolvency, or other similar laws affecting the enforceability of
creditors' rights generally and court decisions with respect thereto, and the
discretion of courts in granting equitable remedies.

          (g)  No Conflict. The execution and delivery by each Purchaser of this
               -----------
Agreement and the consummation of the transactions contemplated hereby by each
Purchaser will not result in any violation of or default under, any provision of
the organizational documents of such Purchaser, any contract to which such
Purchaser is a party or any applicable law, rule or regulation, which violation
or default could reasonably be expected to (i) affect the validity of this
Agreement or any agreement entered into pursuant hereto, (ii) affect in any
material respect any action taken or to be taken by such Purchaser pursuant to
this Agreement or any agreement entered into pursuant hereto or (iii) have a
material adverse effect on the properties, assets, business or operations of
such Purchaser.

     6.   Covenants.
          ---------

          (a)  Pre-Closing Actions. As promptly as practicable, each of the
parties to this Agreement will: (i) use commercially reasonable efforts to take
all actions required of such party to do all other things reasonably necessary,
proper or advisable to consummate the transactions contemplated hereby by the
date of the respective Closing, (ii) file or supply, or cause to be filed or
supplied, all applications, notifications and information required to be filed
or supplied by such party pursuant to Applicable Law in connection with this
Agreement, the issuance of the shares of Series A Preferred Stock pursuant
hereto and the consummation of the other transactions contemplated hereby and by
the Other Agreements; (iii) use all reasonable efforts to obtain, or cause to be
obtained, all Consents (including all Governmental Approvals and any Consents
required under any contract) necessary to be obtained by such party in order to
consummate the transactions

                                     -19-
<PAGE>

contemplated pursuant to this Agreement and the Other Agreements; and (iv)
coordinate and cooperate with the other parties in exchanging such information
and supplying such assistance as may be reasonably requested by the other
parties in connection with any filings and other actions to be made or taken in
order to consummate the transactions contemplated pursuant to this Agreement and
by the Other Agreements.

          (b)  Compliance with the Hart-Scott-Rodino Antitrust Improvements Act
               ----------------------------------------------------------------
of 1976. As promptly as practicable after the execution of this Agreement, the
-------
Company and the Purchasers shall file notifications requesting early termination
of the waiting period under and in accordance with the Hart-Scott-Rodino Act of
1976, as amended (the "HSR Act") in connection with the consummation of the sale
of the Additional Shares contemplated herein and the acquisition by UBS of
preferred stock of Tutopia.com, Inc. The parties shall promptly respond to any
inquiries received from the Federal Trade Commission or the Antitrust Division
of the Department of Justice in connection with such filings and shall cooperate
and use their reasonable best efforts to cause the expiration or early
termination of the waiting period in connection therewith ("HSR Approval"). The
parties acknowledge that such filings and the HSR Approval pursuant thereto
shall be deemed a condition precedent to the consummation of the sale of the
Additional Shares in addition to the conditions precedent applicable thereto set
forth in Section 7 and elsewhere in this Agreement. The costs and expenses
thereof (including filing fees) shall be borne by the Company.

          (c)  Covenants Pending Subsequent Closing. Pending the Subsequent
               ------------------------------------
Closing, neither the Company nor any Subsidiary will, without the Purchasers'
prior written consent, take any action which would result in any of the
representations or warranties made by the Company in this Agreement not being
true in any material respect at and as of the time immediately after such
action, or in any of the covenants contained in this Agreement becoming
incapable of performance. The Company will promptly advise the Purchasers of any
action or event of which it becomes aware which has the effect of making
incorrect any of such representations or warranties in any material respect or
which has the effect of rendering any of such covenants incapable of
performance.

          (d)  No Solicitation. Except as otherwise expressly authorized in this
               ---------------
Agreement, from the date hereof to the Subsequent Closing, the Company and its
Subsidiaries shall (and shall cause their respective employees, directors,
agents and Affiliates to) immediately suspend any existing negotiations or
discussions relating to any sale or other transfer of actual or beneficial
ownership of the Company, any shares of capital stock of the Company or any
Subsidiary, the Business or any of the Company's or any Subsidiary's assets
(other than in the ordinary course of business) (collectively, a "Transaction"),
and the Company and its Subsidiaries shall not, and shall cause their respective
employees, directors, agents and Affiliates to not, (a) solicit any proposals or
offers relating to a Transaction, or (b) negotiate or discuss with any third
party concerning any proposal or offer for a Transaction.

                                     -20-
<PAGE>

          (e)  Books and Records. The Company shall, and shall cause each
               -----------------
Subsidiary to, maintain books and records accurately disclosing all payments
made.

          (f)  Post-Closing Covenants. Until the consummation of a Qualified
               ----------------------
Public Offering, the Company will deliver to each holder of at least 100,000
shares of Series A Preferred Stock and/or Conversion Shares:

               (i)    as soon as available, but in any event within ninety (90)
days after the end of each fiscal year of the Company, a copy of the audited
consolidated balance sheet of the Company and its Subsidiaries as at the end of
such fiscal year and the related audited statements of consolidated income,
stockholders' equity and changes in financial position of the Company and its
Subsidiaries for such fiscal year, setting forth in each case (after the first
full fiscal year of the Company) in comparative form the figures for the
previous year which shall be prepared in accordance with GAAP applied
consistently throughout the periods reflected therein and reported on without
any qualification as to the scope of the audit by independent certified public
accountants of nationally recognized standing;

               (ii)   as soon as available but in any event within thirty (30)
days after the end of each calendar month of the Company such monthly reports
as are presented to management of the Company or any of its Subsidiaries.

               (iii)  No later than thirty (30) days prior to the start of each
fiscal year, an annual business plan setting forth the anticipated strategic
business activities and goals of the Company and its Subsidiaries, including an
expected annual budget and operating plan (containing projections of operating
results) for the Company and its Subsidiaries.

               (iv)   as soon as available, but in any event within forty-five
(45) days after the end of each semi-annual fiscal period of the Company, an
update to the monthly projections contained in the annual budget, operating plan
and business plan furnished by the Company to the Purchasers pursuant to
subsection (iii) above;

               (v)    promptly upon receipt thereof, copies of all final reports
submitted to the Company or any of its Subsidiaries by independent certified
public accountants in connection with each annual, interim or special audit of
the books of the Company or of any of its Subsidiaries made by such accountants,
including, without limitation, any final comment letter submitted by such
accountants to management in connection with their annual audit;

               (vi)   promptly upon their becoming available, copies of all
financial statements, reports, notices and proxy statements sent or made
available generally by the Company to all of its security holders in their
capacity as such or by any Subsidiary of the Company to its security holders,
other than the Company, and of all regular and periodic reports and all final
registration statements and final prospectuses, if

                                     -21-
<PAGE>

any, filed by the Company or any of its Subsidiaries with any securities
exchange or with the SEC or any Governmental Authority succeeding to any of its
functions;

               (vii)  as soon as available, but in any event within thirty (30)
days after the end of each month and within ten (10) days prior to each
regularly scheduled meeting of the Board of Directors of the Company, a
narrative report prepared by the Chief Operating Officer of the Company
detailing the activities, business developments, operating results and marketing
efforts of the Company and its Subsidiaries since the date of the previous such
report delivered by the Company pursuant to this subsection (vii); and

               (viii) such other information reasonably requested by such
Purchaser.

          (g)  Inspection Rights. Until the consummation of a Qualified Public
               -----------------
Offer, each holder of at least 100,000 shares of Series A Preferred Stock and/or
Conversion shares shall have the right, upon reasonable notice, to visit and
inspect any of the properties of the Company or any of its Subsidiaries, and to
discuss the affairs, finances and accounts of the Company or any of its
Subsidiaries with its directors, officers and employees, all at such reasonable
times and as often as may be reasonably requested; provided, however, that the
Company shall not be obligated to provide access to any information which it
reasonably considers to be a trade secret or similar confidential information
unless the recipient of such information executes a nondisclosure agreement in a
form reasonably acceptable to the Company.

          (h)  Post-Closing Covenant of Purchaser. Each Purchaser shall vote all
               ----------------------------------
of the Series A Preferred Stock or any Conversion owned by it in favor of the
increase in the number of shares of Common Stock issuable under the 1998 Stock
Option and Incentive Plan, as amended from 1,800,000 to 2,400,000 at the next
meeting of the stockholders of the Company following the date hereof or by
written consent, as the case may be.

     7.   Conditions to Obligations of the Purchasers. The obligation of each of
          -------------------------------------------
the Purchasers to purchase and pay for the Series A Preferred Stock which it has
agreed to purchase at any Closing and the other obligations of each of the
Purchasers under this Agreement are subject to the fulfillment at or prior to
the respective Closing of the following conditions, any of which may be waived
in writing in whole or in part by such Purchaser:

          (a)  Representations and Warranties. On the date of the respective
               ------------------------------
Closing each of the representations and warranties of the Company set forth in
this Agreement that is qualified as to materiality shall be true and correct in
all respects and each such representation and warranty that is not so qualified
shall be true and correct in all material respects in each case on the date
hereof and at and as of the date of the respective

                                     -22-
<PAGE>

Closing with the same effect as though such representations and warranties had
been made at and as of the date of the respective Closing.

          (b)  Performance. The Company and each of its Subsidiaries shall have
               -----------
performed and complied in all material respects with all agreements and
conditions contained herein required to be performed or complied with by it
prior to or at the respective Closing.

          (c)  Absence of Litigation. (i) The consummation of the transactions
               ---------------------
contemplated hereby shall not have been restrained, enjoined or otherwise
prohibited by any Applicable Law, including any order, injunction, decree or
judgment of any court or other Governmental Authority; (ii) no court or other
Governmental Authority shall have determined that any Applicable Law makes
illegal the consummation of the transactions contemplated hereby and no Action
with respect to the application of any such Applicable Law to such effect shall
be pending or threatened; and (iii) no Action shall be pending or shall have
been threatened which seeks to impose liability upon any of the Purchasers by
reason of the consummation of the transactions contemplated by this Agreement.

          (d)  Opinion of Counsel to the Company and Subsidiaries. The
               --------------------------------------------------
Purchasers shall each have received the written opinion of counsel for the
Company, in form and substance satisfactory to the Purchasers dated and
delivered as of the date of the applicable Closing, substantially identical in
form and substance to Exhibit D hereto.
                      ---------

          (e)  Consents. The Company shall have obtained any and all Consents
               --------
and Governmental Approvals set forth in the Schedule of Exceptions, and shall
have made any and all filings and declarations necessary or appropriate (A) for
the consummation of the transactions contemplated by this Agreement and the
Other Agreements, (B) pursuant to Applicable Law, and (C) pursuant to Contracts
applicable to the Company in connection with the transactions contemplated by
this Agreement and the Other Agreements.

          (f)  Assignment of Intellectual Property. All the Intellectual
               -----------------------------------
Property set forth in the Schedule of Exceptions shall have been assigned or
licensed, as applicable, to the Company pursuant to instruments in form and
substance satisfactory to the Purchasers, and the written Consent of any third
party necessary for any such assignment or license shall have been obtained.

          (g)  Contemporaneous Transactions. Prior to or contemporaneously with
               ----------------------------
the respective Closing:

               (i)    Each of the Stockholders Agreement and Registration Rights
Agreement shall have been executed and delivered by each party named on the
signature pages thereof;

               (ii)   (A) The Company shall have sold to each Purchaser, and
each of the Purchasers shall have purchased, the shares of Series A Preferred
Stock to be

                                     -23-
<PAGE>

purchased at such Closing by such Purchaser under this Agreement, and (B) the
Company shall have delivered to each Purchaser certificates representing such
shares of Series A Preferred Stock, each registered in the name of such
Purchaser or the name of its nominee(s).

               (iii)  The Certificate in the form attached hereto as Exhibit B
                                                                     ---------
hereto shall have been duly filed with the Secretary of State of the State of
Delaware. The Certificate shall be in full force and effect as of the Initial
Closing and shall not have been amended or modified.

               (iv)   Each of the Company and Tutopia.com, Inc. shall have
executed and delivered to the Purchasers the Commitment Letter.

               (v)    The Subscription and Joint Venture Agreement, dated as of
November 23, 1998, among the Company, Emerging Networks, Inc., International
Technology Investments, LLC and Lee S. Casty, as amended by the First Amendment
to Subscription and Joint Venture Agreement dated as of March 22, 2000 shall
have been terminated and be of no further force or effect.

               (vi)   With respect to the Subsequent Closing, the acquisition by
UBS of preferred stock of Tutopia.com, Inc. contemplated by the Commitment
Letter shall have been consummated on substantially the same terms as those
outlined in the Commitment Letter.

          (h)  Closing Papers. The Company shall have delivered to each of the
               --------------
Purchasers all of the following:

               (i)    a certificate signed by the President and Chief Executive
Officer of the Company, dated as of the date of the respective Closing, stating
that (A) the person signing such certificate has made or has caused to be made
such investigations as are necessary to permit him to certify the accuracy of
the information set forth therein, (B) such certificate does not misstate any
material fact and does not omit to state any fact necessary to make the
certificate not misleading, and (C) the other conditions specified in this
Section 7 have been satisfied;
---------

               (ii)   copies (certified by the President, Secretary or Assistant
Secretary of the Company or, if required under Applicable Law, the applicable
Governmental Authority) of the resolutions duly adopted by the Board of
Directors of the Company authorizing the adoption of the Certificate and
authorizing the execution, delivery and performance of this Agreement, the Other
Agreements and all other agreements referred to in this Agreement as being
executed at or prior to the Initial Closing;

               (iii)  copies (certified by the Secretary or Assistant Secretary
of the Company) of the Certificate of Incorporation and Bylaws (or equivalent
documents) of

                                     -24-
<PAGE>

the Company and, each of the Subsidiaries listed on Schedule 7(h)(iii) hereto,
                                                    ------------------
in each case as amended through the date of the respective Closing; and

               (iv)   such other documents relating to the transactions
contemplated by this Agreement as any Purchaser may reasonably request.

          (i)  Absence of Material Adverse Effect. No event or series of events
               ----------------------------------
shall have occurred which has had or could reasonably be expected to have a
Material Adverse Effect.

          (j)  Proceedings. All corporate and other proceedings of the Company
               -----------
taken or to be taken in connection with the transactions contemplated hereby and
by the Other Agreements to be consummated at the respective Closing and all
documents incident thereto shall be reasonably satisfactory in form and
substance to each Purchaser.

          (k)  Legends. (i) Each stock certificate issued by the Company to
               -------
stockholders party to the Stockholder Agreement or Registration Rights Agreement
on or prior to the date of respective Closing shall have been stamped or
otherwise imprinted with a legend in substantially the form provided in Section
5.12 of the Stockholders Agreement and Section 2 of the Registration Rights
Agreement.

          (l)  Private Equity Fee. At the time of each of the Initial Closing
               ------------------
and the Subsequent Closing, the Company shall have paid UBS Capital Americas
III, L.P., a private equity fee of 3% of the purchase price of the Shares
purchased in such Closing.

          (m)  HSR Approval. In connection with the Subsequent Closing, the HSR
               ------------
Approval with respect to the sale of the Additional Shares shall have been
obtained.

     8.   Conditions to the Obligations of the Company. The obligations of the
          --------------------------------------------
Company under this Agreement are subject to the fulfillment on or prior to the
date of the respective Closing of the following conditions, any of which may be
waived in writing, in whole or in part, by the Company:

          (a)  Representations and Warranties. On the date of the respective
               ------------------------------
Closing, each of the representations and warranties of the Purchasers set forth
in this Agreement shall be true and correct in all respects on the date hereof
and at and as of the date of the respective Closing with the same effect as
though such representations and warranties had been made at and as of the date
of the respective Closing.

          (b)  Performance. The Purchasers shall have performed and complied in
               -----------
all material respects with all agreements and conditions contained herein
required to be performed by or complied with by them prior to the respective
Closing.

          (c)  HSR Approval. In connection with the Subsequent Closing, the HSR
               ------------
Approval with respect to the sale of the Additional Shares shall have been
obtained.

                                     -25-
<PAGE>

     9.  Survival. The representations and warranties of the Company set forth
         --------
in Sections 4(a), 4(b), 4(c), 4(d), 4(e), 4(h), 4(j), 4(o), 4(q), 4(t), 4(u) and
4(y) and shall survive the Closings indefinitely. All other representations and
warranties of the Company contained herein shall expire at the second
anniversary of the Subsequent Closing. The representations and warranties of the
Purchasers contained herein shall survive the Subsequent Closing for a period of
two years. All covenants and agreements contained herein shall survive the
Closings indefinitely.

     10. Termination. The obligations to purchase and sell Additional Shares
         -----------
pursuant to Section 3 may be terminated:

         (a)  by mutual written consent of all of the parties hereto;

         (b)  by any of the Purchasers by written notice to the Company if any
of the conditions to the Subsequent Closing set forth in Section 7 shall not
                                                         ---------
have been fulfilled by 5:00 p.m. New York time on August 15, 2000, unless such
failure shall be due to the failure of such Purchaser to perform or comply with
any of the covenants, agreements or conditions hereof to be performed or
complied with by it prior to the Subsequent Closing; or

         (c)  by the Company or any of the Purchasers, by written notice to the
other parties, if the HSR Approval with respect to the sale of the Additional
Shares shall not have been obtained by 5:00 p.m. New York time on August 15,
2000, unless such failure shall be due in part to the failure of such party to
perform or comply with its obligations under Section 6(b).

     11. Effect of Termination. If the obligations to purchase and sell
         ---------------------
Additional Shares pursuant to Section 3 are terminated pursuant to the
provisions of Section 10, then Sections 3, 6(c), 6(d) and 6(e) of this Agreement
shall become void and have no effect, without any liability to any person in
respect hereof or of the transactions contemplated hereby on the part of any
party hereto, or any of its directors, officers, employees, consultants, agents,
representatives, advisers, stockholders or Affiliates except for any liability
resulting from such party's breach or default under this Agreement.

     12. Miscellaneous Provisions.
         ------------------------

         (a)  Acknowledgment. Each Purchaser acknowledges and agrees that it
              --------------
has, independently and without reliance upon any other Purchaser, made its own
evaluation and decision to purchase the Series A Preferred Stock to be purchased
by it pursuant to this Agreement. Each Purchaser further acknowledges that no
other Purchaser has acted as an agent for such Purchaser or the Company in
connection with the purchase of the shares of Series A Preferred Stock hereunder
and will not be acting as an agent for such Purchaser in connection with
monitoring its investment hereunder.

                                     -26-
<PAGE>

         (b)  Notices. All notices, requests, demands, approvals, consents,
              -------
waivers or other communications required or permitted to be given hereunder
(each, a "Notice") shall be in writing and shall be (a) personally delivered,
(b) transmitted by telecopy facsimile, provided that the original copy thereof
also is sent by pre-paid, first class, registered or certified mail (return
receipt requested) or by next-day or overnight mail (to any United States
address), or by an internationally recognized express delivery service (to any
foreign address), (c) sent by first class, registered or certified mail (return
receipt requested) or by next-day or overnight mail (to any United States
address), postage and charges prepaid, or (d) delivered by an internationally
recognized express delivery service (to any foreign address), postage and
charges prepaid:

              (i)    if to any Purchaser, at the address and numbers set forth
 at the end of this Agreement, marked for attention as therein indicated;

              (ii)   if to the Company, to:

                     IFX Corporation
                     707 Skokie Boulevard
                     Suite 580
                     Northbrook, Illinois 60062
                     Attention:  Chief Executive Officer
                     Telephone Number: 847-412-9411
                     Telecopy Number: 305-574-7867

                     With a copy to:

                     Neal, Gerber & Eisenberg
                     Two North LaSalle Street
                     Chicago, Illinois 60602
                     Attention: Scott J. Bakal, Esq.

                     Telephone Number: 312-269-8000
                     Telecopy Number: 312-269-1747

or, in each case, at such other address and numbers as may have been furnished
in a Notice by such Person to the other parties. Any Notice shall be deemed
effective or given upon receipt (or refusal of receipt).

          (c)  Severability. Should any Section or any part of a Section within
               ------------
this Agreement be rendered void, invalid or unenforceable by any court of law
for any reason, such invalidity or unenforceability shall not void or render
invalid or unenforceable any other Section or part of a Section in this
Agreement.

          (d)  Governing Law. This Agreement shall be governed by and construed
               -------------
and enforced in accordance with the internal laws of the State of New York
without regard to the principles of conflicts of law thereof. Each party hereto
hereby

                                     -27-
<PAGE>

irrevocably submits to the nonexclusive jurisdiction of the courts of the
State of New York and of the United States of America sitting in the City of New
York, Borough of Manhattan, for the adjudication of any dispute hereunder or in
connection herewith or with any transaction contemplated hereby or discussed
herein, and hereby irrevocably waives, and agrees not to assert in any suit,
action or proceeding, any claim that it is not personally subject to the
jurisdiction of any such court, that the venue thereof may not be appropriate,
that such suit, action or proceeding is improper or that this Agreement or any
of the documents referred to in this Agreement may not be enforced in or by said
courts, and each party hereto irrevocably agrees that all claims with respect to
such suit, action or proceeding may be heard and determined in such a New York
state or federal court. Each party hereby irrevocably waives personal service of
process and consents to process being served in any such suit, action or
proceeding by mailing a copy thereof to such party in the manner provided in
Section 12(b) and agrees that such service shall constitute good and sufficient
service of process and notice thereof. Nothing contained herein shall be deemed
to limit in any way any right to serve process in any manner permitted by law.
EACH PARTY HEREBY IRREVOCABLY WAIVES ANY RIGHT IT MAY HAVE, AND AGREES NOT TO
REQUEST, A JURY TRIAL FOR THE ADJUDICATION OF ANY DISPUTE HEREUNDER OR IN
CONNECTION HEREWITH OR ARISING OUT OF THIS AGREEMENT OR ANY TRANSACTION
CONTEMPLATED HEREBY.

          (e)  Publicity. Except as required by Applicable Law or the
               ---------
requirements of any securities exchange or market (in which case the nature of
the announcement shall be described to the other parties (and the other parties
shall be allowed reasonable time to comment) prior to dissemination to the
public), no party shall make any public announcement in respect of this
Agreement or the transactions contemplated hereby without the prior written
consent of the other parties.

          (f)  Captions and Section Headings. Captions or section headings
               -----------------------------
contained in this Agreement are inserted as a matter of convenience and for
reference purposes only, and in no way define, limit, extend or describe the
scope of this Agreement or the intent of any provision hereof.

          (g)  Amendments and Waivers. Neither this Agreement nor any term
               ----------------------
hereof, may be changed, waived, discharged or terminated orally or in writing,
except that any term of this Agreement may be amended and the observance of any
such term may be waived (either generally or in a particular instance and either
retroactively or prospectively) with (but only with) the prior written consent
of the Company and all the Purchasers; provided, however, that no such amendment
or waiver shall extend to or affect any obligation not expressly waived or
impair any right consequent therein.

          (h)  Successors and Assigns. All rights, covenants and agreements of
               ----------------------
the parties contained in this Agreement shall, except as otherwise provided
herein, be binding upon and inure to the benefit of their respective successors
and assigns. This Agreement may not be assigned (by operation of law, contract
or otherwise) by any party hereto; provided, however, that each Purchaser may
assign or otherwise transfer its rights

                                     -28-
<PAGE>

and obligations hereunder to: (i) any Person who acquires shares of Series A
Preferred Stock from any Purchaser or any successor or assign of any Purchaser;
or (ii) any successor-in-interest to substantially all of such Purchaser's or
successor's or assign's business (whether by stock sale, asset sale or
otherwise).

          (i)  Expenses. The Company agrees to pay the reasonable fees and
               --------
reimburse the reasonable out-of-pocket expenses, including legal and accounting
fees and expenses, of the Purchasers, upon receipt of the bill therefor, in
connection with the transactions contemplated by this Agreement and the Other
Agreements. The Company agrees to reimburse reasonable travel and lodging
expenses of the Purchasers in connection with attendance of the Purchasers'
representatives at meetings of the Board of Directors of the Company and other
visits to the Company associated with exercising or fulfilling any of its rights
or obligations under this Agreement or the Other Agreements.

          (j)  Entire Agreement. This Agreement (including the attached Exhibits
               ----------------
and Schedules) contains the entire agreement and understanding of the parties
and there are no further or other agreements or understandings, written or oral,
in effect between the parties relating to the subject matter hereof.

          (k)  Exhibits. The Exhibits and Schedules attached to this Agreement
               --------
hereby are incorporated into and made a part of this Agreement.

          (l)  Further Assurances. Each party shall cooperate and take such
               ------------------
actions as may be reasonably requested by another party in order to carry out
the provisions and purposes of this Agreement and the Other Agreements and the
transactions contemplated hereby and thereby.

          (m)  Condition to Effectiveness. This Agreement shall become effective
               --------------------------
only upon its execution and delivery by the Company and each Purchaser.

          (n)  Counterparts. This Agreement may be executed (including by
               ------------
facsimile transmission) with counterpart signature pages or in one or more
counterparts, each of which shall be deemed an original but all of which
together shall constitute one and the same instrument.

          (o)  Attorneys' Fees. If any party initiates any legal action arising
               ---------------
out of or in connection with this Agreement or any of the Other Agreements, the
prevailing party in such legal action shall be entitled to recover from the
other party all reasonable attorneys' fees, expert witness fees and expenses
incurred by the prevailing party in connection therewith.

          (p)  Disclosure Generally. The Schedule of Exceptions shall be
               --------------------
arranged in sections corresponding to the Sections contained in this Agreement,
and the disclosures in any section of the Schedule of Exceptions shall qualify
only (a) the corresponding section of this Agreement, and (b) other sections of
Section 4 to the extent it is clear

                                     -29-
<PAGE>

(notwithstanding the absence of a specific cross-reference) from a reading of
the exception that such exception is applicable to such other sections. The
inclusion of any information in the Schedules shall not be deemed to be an
admission or acknowledgment, in and of itself, that such information is material
or has or would have a Material Adverse Effect, or is outside the ordinary
course of business.

     13.  Definitions.
          -----------

          (a)  Definitions. For the purposes of this Agreement, the following
               -----------
terms shall have the meanings specified below:

          "Action" has the meaning set forth in Section 4(g)(i).
           ------                               ---------------

          "Additional Share Aggregate Purchase Price" has the meaning set forth
           -----------------------------------------
the Recitals.

          "Additional Shares" has the meaning set forth in Section 3.
           -----------------                               ---------

          "Affiliate" of a specified Person means (i) any Person that directly
           ---------
or indirectly, through one or more intermediaries, controls, is controlled by,
or is under common control with, such specified Person, or (ii) in the case of a
natural Person, such Person's spouse, parent or lineal descendant (whether by
blood or adoption and including stepchildren). "Control" (including the terms
                                                -------
"controlled by" and "under common control with") means the possession, directly
 -------------       -------------------------
or indirectly, of the power to direct or cause the direction of the management
policies of a Person, whether through the ownership of voting securities, by
contract or credit arrangement, as trustee or executor, or otherwise.

          "Agreement" shall mean this Agreement (including the Schedules and
           ---------
Exhibits hereto), as amended, supplemented or modified from time to time in
accordance with the provisions hereof.

          "Applicable Law" shall mean, with respect to any Person, any and all
           --------------
provisions of any constitution, treaty, statute, law, regulation, ordinance,
code, rule, judgment, rule of common law, order, decree, award, injunction,
Governmental Approval, concession, grant, franchise, license, agreement,
directive, guideline, policy, requirement, or other governmental restriction or
any similar form of decision of, or determination by, or any interpretation or
administration of any of the foregoing by, any Governmental Authority, whether
in effect as of the date hereof or thereafter and in each case as amended,
applicable to such Person or its subsidiaries or their respective assets.

          "Average Closing Price" has the meaning set forth in Section 3.
           ---------------------                               ---------

          "Benefit Plan" shall mean any plan, agreement or arrangement, formal
           ------------
or informal, whether oral or written, whereby the Company or any Subsidiary
provides any benefit to any present or former officer, director or employee, or
dependent or beneficiary thereof, including any profit sharing, deferred
compensation, stock option performance

                                     -30-
<PAGE>

stock, pension, death benefit or other fringe benefit, employee stock purchase,
bonus, severance, retirement, health or insurance plan.

                  "Board" shall mean the Board of Directors of the Company.
                   -----

                  "Business" shall mean the business of the Company and each of
                   --------
its Subsidiaries.

                  "Certificate" has the meaning set forth in Section 1(a).
                   -----------                               ------------

                  "Closing(s)" has the meaning set forth in Section 3.
                   ----------                               ---------

                  "Closing Per Share Price" has the meaning set forth in Section
                   -----------------------                               -------
3.
-
                  "Common Stock" has the meaning set in Section 4(c)(i).
                   ------------                         ---------------

                  "Commitment Letter" shall mean the commitment letter and
                   -----------------
attached term sheet relating to UBS' acquisition of preferred stock of
Tutopia.com, Inc. in form and substance identical to Exhibit G hereto.
                                                     ---------

                  "Company" has the meaning set forth in the first paragraph
                   -------
hereof.

                  "Consent" shall mean any consent, approval, authorization,
                   -------
waiver, permit, grant, franchise, concession, agreement, license, exemption or
order of, registration, certificate, declaration or filing with, or report or
notice to, any Person, including any Governmental Authority.

                  "Contracts" has the meaning set forth in Section 4(m)(i).
                   ---------                               ---------------

                  "Contracts Schedule" has the meaning set forth in Section
                   ------------------                               -------
4(m)(i).
-------

                  "Conversion Shares" has the meaning set forth in Section
                   -----------------                               -------
4(c)(iv).
--------

                  "Convertible Securities" shall mean (i) any rights, options or
                   ----------------------
warrants issued by the Company or any of its Subsidiaries to acquire Common
Stock or any capital stock of the Company or any Subsidiary, including the
shares of Series A Preferred Stock to be issued hereunder, and (ii) any notes,
debentures, shares of preferred stock or other securities, options, warrants or
rights issued by the Company or any of its Subsidiaries, which are convertible
or exercisable into, or exchangeable for, Common Stock or any capital stock of
the Company or any Subsidiary.

                  "$" or "dollars" shall mean lawful money of the United States
                   -      -------
of America.

                  "Encumbrance" shall mean any lien, encumbrance, hypothecation,
                   -----------
right of others, proxy, voting trust or similar arrangement, pledge, security
interest, collateral security agreement, limitations on voting rights,
limitations on rights of ownership filed

                                     -31-
<PAGE>

with any Governmental Authority, claim, charge, equities, mortgage, pledge,
objection, title defect, title retention agreement, option, restrictive
covenant, restriction on transfer, right of first refusal, right of first offer,
statutory or contractual preemptive right or any comparable interest or right
created by or arising under Applicable Law, of any nature whatsoever.

                  "Environmental Law" means any United States federal, state,
                   -----------------
local or foreign law, statute, rule or regulation or the common law relating to
the protection of human health or the environment, including, without
limitation, CERCLA (as defined below), the United States federal Resource
Conservation and Recovery Act of 1976 as amended (the "Recovery Act"), any
statute, regulation or order pertaining to (i) treatment, storage, disposal,
generation and transportation of industrial, toxic or hazardous materials or
substances or solid or hazardous waste; (ii) air, water and noise pollution;
(iii) groundwater and soil contamination; (iv) the release or threatened release
into the environment of industrial, toxic or hazardous materials or substances,
or solid or hazardous waste, including, without limitation, emissions,
discharges, injections, spills, escapes or dumping of pollutants, contaminants,
or chemicals; (v) the protection of wild life, marine life and wetlands,
including, without limitation, all endangered and threatened species; (vi)
storage tanks, vessels, abandoned or discarded barrels, containers and other
closed receptacles; (vii) health and safety of employees and other persons; and
(viii) manufacture, processing, use, distribution, treatment, storage, disposal,
transportation or handling of pollutants, contaminants, toxic or hazardous
materials or substances or oil or petroleum products or solid or hazardous
waste. As used herein, the terms "release" and "environment" has the meaning set
forth in the United States federal Comprehensive Environmental Response,
Compensation and Liability Act of 1980, as amended ("CERCLA").

                  "Fully Diluted Basis" shall mean, when used with respect to
                   -------------------
outstanding shares of Common Stock, all shares of Common Stock which would be
outstanding after giving effect to the transactions contemplated by this
Agreement and assuming the exercise, conversion or exchange of all Convertible
Securities.

                  "GAAP" shall mean United States generally accepted accounting
                   ----
principles consistently applied.

                  "Governmental Approvals" shall mean any action, order,
                   ----------------------
authorization, consent, approval, license, lease, waiver, franchise, concession,
agreement, license, ruling, permit, tariff, rate, certification, exemption of,
filing or registration by or with, or report or notice to, any Governmental
Authority.

                  "Governmental Authority" shall mean any nation or foreign or
                   ----------------------
domestic government, any state or other political subdivision thereof, any
entity exercising executive, legislative, judicial, regulatory or administrative
functions of or pertaining to government (including, without limitation, any
government authority, agency, department, board, commission or instrumentality
of the United States, any State of the United States

                                     -32-
<PAGE>

or any political subdivision thereof), or any tribunal or arbitrator(s) of
competent jurisdiction, or any self-regulatory organization.

                  "HSR Approval" has the meaning set forth in Section 6(b).
                   ------------                               ------------

                  "include", "includes", "included" and "including" shall be
                   -------    --------    --------       ---------
construed as if followed by the phrase "without being limited to".

                  "Initial Share Aggregate Purchase Price" has the meaning set
                   --------------------------------------
forth in the Recitals

                  "Initial Shares" has the meaning set forth in Section 2.
                   --------------                               ---------

                  "Initial Per Share Price" has the meaning set forth in Section
                   -----------------------                               -------
2.
-

                  "Intellectual Property" shall mean any and all worldwide,
                   ---------------------
international, U.S. and/or foreign, patents, all applications therefor and all
reissues, reexaminations, continuations, continuations-in-part, divisions, and
patent term extensions thereof, inventions (whether patentable or not),
discoveries, improvements, concepts, innovations, industrial models, registered
and unregistered copyrights, copyright registrations and applications, author's
rights, works of authorship (including any text or artwork of any kind, and
software of all types in whatever medium, inclusive of computer programs, source
code, object code and executable code, and related documentation), URLs, web
sites, web pages and any part thereof, technical information, know-how, trade
secrets, drawings, designs, design protocols, specifications for parts and
devices, quality assurance and control procedures, design tools, manuals,
research data concerning historic and current research and development efforts,
including the results of successful and unsuccessful designs, databases and
proprietary data, proprietary processes, technology, engineering, discoveries,
formulae, algorithms, operational procedures, trade names, trade dress,
trademarks, domain names, and service marks, and registrations and applications
therefor, the goodwill of the business symbolized or represented by the
foregoing, customer lists and other proprietary information and common-law
rights.

                  "Material Adverse Effect" shall mean any event, circumstance,
                   -----------------------
occurrence, fact, condition, change or effect that is materially adverse to (i)
the Business, operations, results of operations, financial condition, prospects,
properties, assets or liabilities of the Company and its Subsidiaries, taken as
a whole, or (ii) the ability of the Company to perform fully its obligations
hereunder and under the Other Agreements and to consummate the transactions
contemplated hereby and thereby. For the purposes of this Agreement, a currency
devaluation or foreign exchange restriction or other actions by any Governmental
Authority limiting repatriation of capital or any other material change in the
governmental or political climate of the countries in which the Company or its
Subsidiaries carry out the Business shall be deemed to have a Material Adverse
Effect.

                  "Material Instruments" has the meaning set forth in Section
                   --------------------                               -------
4(e).
----

                                     -33-
<PAGE>

                  "Materials of Environmental Concern" means any chemicals,
                   ----------------------------------
pollutants or contaminants, hazardous substances (as such term is defined under
CERCLA), solid wastes and hazardous wastes (as such terms are defined under the
Recovery Act), toxic materials, oil or petroleum and petroleum products, or any
other material subject to regulation under any Environmental Law.

                  "Notice" has the meaning set forth in Section 12(b).
                   ------                               -------------

                  "Other Agreements" has the meaning set forth in Section
                   ----------------                               -------
4(b)(i).
-------

                  "Per Share Price" has the meaning set forth in Section 2.
                   ---------------                               ---------

                  "Person" or "person" shall mean any natural person, company,
                   ------      ------
corporation, association, partnership, organization, business, firm, joint
venture, trust, unincorporated organization or any other entity or organization,
and shall include any Governmental Authority.

                  "Preferred Stock" has the meaning set forth in Section
                   ---------------                               -------
4(c)(i).
-------

                  "Qualified Public Offering" shall mean an underwritten public
                   -------------------------
offering of shares of Common Stock for which the Company has obtained a firm
commitment from one or more underwriter(s) for at least $75 million of Common
Stock and in which the Company receives gross proceeds from the sale of Common
Stock to the public of at least $56.25 million (before deduction of
underwriter's discounts and commissions), and which values the equity of the
Company at no less than $400 million pre-offering.

                  "Registration Rights Agreement" means the Registration Rights
                   -----------------------------
Agreement to be entered into among the Company and the stockholders of the
Company, in form and substance identical to Exhibit F hereto.
                                            ---------

                  "Schedule of Exceptions" has the meaning set forth in the
                   ----------------------
first paragraph of Section 4.
                   ---------

                  "Schedule of Purchasers" has the meaning set forth in the
                   ----------------------
first paragraph hereof.

                  "Securities Act" has the meaning set forth in Section 4(i).
                   --------------                               ------------

                  "Series A Preferred Stock" has the meaning set forth in
                   ------------------------
Section 1(a).
------------

                  "SEC" shall mean the U.S. Securities and Exchange Commission
                   ---
or any successor agency thereto.

                  "SEC Reports" has the meaning set forth in Section 4(y).
                   -----------

                                     -34-
<PAGE>

                  "Stock Option Plan" means the IFX Corporation Directors Stock
                   -----------------
Option Plan and the 1998 IFX Corporation Stock Option and Incentive Plan.

                  "Stockholders Agreement" means the Stockholders Agreement to
                   ----------------------
be entered into among the Company and the stockholders of the Company, in form
and substance identical to Exhibit E hereto.
                           ---------

                  "Subsidiary" means any Person of which equity securities
                   ----------
possessing a majority of (i) the ordinary voting power in electing the board of
directors, or (ii) the outstanding capital stock or other equity interests, are,
at the time as of which such determination is being made, owned by the Company
either directly or indirectly through one or more Subsidiaries.

                  "Taxes" shall mean any domestic or foreign taxes, charges,
                   -----
feed, levies or other assessments, including any income, alternative, minimum,
accumulated earnings, personal holding company, franchise, capital stock, net
worth, capital, profits, windfall profits, gross receipts, value added, sales,
use, goods and services, excise, customs duties, transfer, conveyance, mortgage,
registration, stamp, documentary, recording, premium, severance, environmental,
real property, personal property, ad valorem, intangibles, rent, occupancy,
license, occupational, employment, unemployment insurance, social security,
disability, worker's compensation, payroll, health care, withholding, estimated
or other taxes, charges, fees, levies or other assessments, and including any
interest, penalties or additions relating thereto, imposed by any Governmental
Authority or other taxing authority.

                  "Transaction" has the meaning set forth in Section 6(d).
                   -----------                               ------------

                  "UBS" shall mean (i) UBS Capital Americas III, L.P., a
                   ---
Delaware limited partnership, (ii) UBS Capital LLC, a Delaware limited liability
company and (iii) any Affiliate of either of the foregoing entities,
individually and collectively.

                  (b)    Other Definitional Provisions. The words "hereof",
                         -----------------------------             ------
"herein", and "hereunder" and words of similar import shall refer to this
 ------        ---------
Agreement as a whole and not to any particular provision of this Agreement.
Terms defined in the singular shall have a comparable meaning when used in the
plural and vice versa. Whenever a representation or warranty made by a Person
herein refers to the knowledge of such Person, such knowledge shall be deemed to
consist of the actual knowledge of such Person or the knowledge which would have
been present after reasonable due inquiry by such Person. A Person (other than
an individual) will be deemed to have "knowledge" of a particular fact or other
                                       ---------
matter if any individual who is serving, or who has at any time served, as a
director, executive officer, member, partner, executor or trustee of such Person
(or a Person acting in any similar capacity) has, or any time had, actual
knowledge of such fact or other matter, or should have had knowledge thereof
given such individual's office or capacity and given industry standards or given
reasonable due inquiry by such individual.

                                     -35-
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Agreement as of the date first above written.

                                                        IFX CORPORATION

                                                        /s/ Joel Eidelstein
                                                        ------------------------
                                                        By: Joel Eidelstein
                                                        Title: President

                                      S-1
<PAGE>

Purchaser:
---------

         The undersigned hereby executes and delivers this Agreement as of the
date first above written as one of the Purchasers referred to therein for the
purpose of purchasing from the Company the Initial Shares at the Initial Closing
and the Additional Shares at a Subsequent Closing.

                                      UBS CAPITAL AMERICAS III, L.P.

                                      By: UBS Capital Americas (LA-Advisors),
                                          LLC

                                      By: /s/ Charles W. Moore
                                         --------------------------------------
                                         Name: Charles W. Moore
                                         Title: Principal

                                      By: /s/ Marc Unger
                                         --------------------------------------
                                          Name: Marc Unger
                                          Title: Chief Financial Officer

Address:        UBS Capital Americas III, L.P.
                c/o UBS Capital Americas
                    (LA - Advisors), LLC
                299 Park Avenue
                New York, NY 10171
                Attention: Charles W. Moore

Telephone No.:  (212) 821-6330
Telecopy No.:   (212) 821-6333

                                      S-2
<PAGE>

With a copy
of Notices to:  Kaye, Scholer, Fierman, Hays & Handler, LLP
                425 Park Avenue
                New York, New York 10022
                Attention: Nancy Fuchs, Esq.

Telephone No.:  (212) 836-8565
Telecopy No.:   (212) 826-7246

                                      S-3
<PAGE>

Purchaser:
---------

         The undersigned hereby executes and delivers this Agreement as of the
date first above written as one of the Purchasers referred to therein for the
purpose of purchasing from the Company the Initial Shares at the Initial Closing
and the Subsequent Shares at a Subsequent Closing.

                                              UBS CAPITAL LLC

                                              By: /s/ George Duarte
                                                  ---------------------------
                                                  Name: George Duarte
                                                  Title: Attorney-in-Fact

                                              By: /s/ Marc Unger
                                                  ---------------------------
                                                  Name: Marc Unger
                                                  Title: Attorney-in-Fact

Address:         UBS Capital LLC
                 299 Park Avenue
                 New York, NY 10171
                 Attention: Charles W. Moore
Telephone No.:   (212) 821-6330
Telecopy No.:    (212) 821-6333

With a copy
of Notices to:   Kaye, Scholer, Fierman, Hays & Handler, LLP
                 425 Park Avenue
                 New York, New York 10022
                 Attention: Nancy Fuchs, Esq.

Telephone No.:   (212) 836-8565
Telecopy No.:    (212) 826-7246

                                      S-1
<PAGE>

                                   EXHIBIT A

                            SCHEDULE OF PURCHASERS

                                IFX Corporation

                           Series A Preferred Stock

--------------------------------------------------------------------------------
             Purchaser                       Number of Initial Shares
             ---------                       ------------------------
--------------------------------------------------------------------------------

   UBS Capital Americas III, L.P.                     1,149,878

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

          UBS Capital LLC                               60,520

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

                                      A-1

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