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                                                                     EXHIBIT 4.1


                   CERTIFICATE OF DESIGNATION, NUMBER, POWERS,
                    PREFERENCES AND RELATIVE, PARTICIPATING,
                      OPTIONAL AND OTHER RIGHTS OF SERIES D
                           CONVERTIBLE PREFERRED STOCK
                                       OF
                                 IFX CORPORATION

          IFX Corporation (the "Corporation"), a corporation organized and
existing under the General Corporation Law of the State of Delaware, hereby
certifies that, pursuant to the provisions of Section 151 of the General
Corporation Law of the State of Delaware, its Board of Directors, at a meeting
duly held on February 14, 2002 adopted the following resolution:

          WHEREAS, the Board of Directors of the Corporation is authorized by
the Restated Certificate of Incorporation to issue up to 40,000,000 shares of
preferred stock ("Preferred Stock") in one or more series and, in connection
with the creation of any series, to fix by the resolutions providing for the
issuance of shares the powers, designations, preferences and relative,
participating, optional or other rights of the series and the qualifications,
limitations or restrictions thereof; and

          WHEREAS, it is the desire of the Board of Directors of the
Corporation, pursuant to such authority, to authorize and fix terms and
provisions of a series of preferred stock, and the number of shares constituting
such series.

          NOW, THEREFORE, BE IT RESOLVED, that there is hereby authorized a
series of preferred stock on the terms and with the provisions herein set forth
on Annex A attached to this resolution.



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


ATTEST:

/s/ Jose Leiman
--------------------------------------
Name: Jose Leiman
Title: Chief Financial Officer

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                                     ANNEX A

                      SERIES D CONVERTIBLE PREFERRED STOCK

          The powers, designations, preferences and relative, participating,
optional or other rights of the Series D Convertible Preferred Stock of IFX
Corporation (the "Corporation") are as follows:

     1.   DESIGNATION AND AMOUNT.

          This series of preferred stock shall be designated as "Series D
Convertible Preferred Stock." The Series D Convertible Preferred Stock shall
have $1.00 par value per share. The number of authorized shares of the Series D
Convertible Preferred Stock shall be 8,509,675 shares. Shares of the Series D
Convertible Preferred Stock shall have a stated value of Six and 00/100 Dollars
($6.00) per share (the "Stated Value"). The Corporation has previously
authorized (i) 2,030,869 shares of its Series A Convertible Preferred Stock, par
value $1.00 per share (the "Series A Convertible Preferred Stock") having the
number, powers, preferences and relative, participating, optional and other
rights as set forth in the Amended Certificate of Designation on file with the
Secretary of State of the State of Delaware (the "Series A Certificate"), (ii)
4,418,262 shares of its Series B Convertible Preferred Stock, par value $1.00
per share, the "Series B Convertible Preferred Stock"), having the number,
powers, preferences and relative, participating, optional and other rights as
set forth in the Amended Certificate of Designation on file with the Secretary
of State of the State of Delaware (the "Series B Certificate"), and 3,876,241
shares of its Series C Convertible Preferred Stock, par value $1.00 per share
the "Series C Convertible Preferred Stock"), having the number, powers,
preferences and relative, participating, optional and other rights as set forth
in the Certificate of Designation on file with the Secretary of State of the
State of Delaware (the "Series C Certificate"). The Series A Convertible
Preferred Stock, the Series B Convertible Preferred Stock, the Series C
Convertible Preferred Stock, the Series D Convertible Preferred Stock and shares
of any other class or series of preferred stock of the Corporation which is
convertible, directly or indirectly, into Common Stock, whether at the time of
issuance or upon passage of time or the occurrence of some future event, are
collectively referred to herein as "Convertible Preferred Stock."

     2.   DIVIDENDS.

          (a)  Right to Receive Dividends. Holders of Series D Convertible
Preferred Stock shall be entitled to receive dividends when, as and if declared
by the Board of Directors of the Corporation (the "Board of Directors").

          (b)  Participation with Common Stock. In the event the Board of
Directors shall elect to pay or declare and set apart for payment any dividend
on any shares of common stock, par value $.02 per share, of the Corporation (the
"Common Stock") in cash out of funds legally available therefor or in stock or
other consideration, the holders of the Series D Convertible Preferred Stock
shall be entitled to receive, before any dividend shall be declared and paid or
set aside for the Common Stock, dividends payable in the form and in an amount
per share equal to the per share amount that would have been payable to such
holders had such

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holders converted their Series D Convertible Preferred Stock into Common Stock
and had all other holders of Convertible Preferred Stock converted such shares
into Common Stock.

          (c) Dividend Preference. Dividends on the Series D Convertible
Preferred Stock shall be payable before any dividends or distributions or other
payments shall be paid or set aside for payment upon the Common Stock or any
other stock ranking on liquidation or as to dividends or distributions junior to
the Series D Convertible Preferred Stock (any such stock, together with the
Common Stock, being referred to hereinafter as "Junior Stock"). If there shall
be outstanding shares of any class or series of capital stock which is entitled
to share ratably with the Series D Convertible Preferred Stock in the payment of
dividends or distributions or upon liquidation ("Parity Securities"), no full
dividends shall be declared or paid or set apart for payment on any such
securities unless dividends have been or contemporaneously are ratably declared
and paid or declared and a sum sufficient for the payment thereof set apart for
such payment on the Series D Convertible Preferred Stock.

     3.   LIQUIDATION PREFERENCE.

          (a)  In the event of any bankruptcy, liquidation, dissolution or
winding up of the Corporation (a "Liquidation"), either voluntary or
involuntary, each holder of Series D Convertible Preferred Stock at the time
thereof shall be entitled to receive, prior and in preference to any
distribution of any of the assets or funds of the Corporation to the holders of
the Common Stock or other Junior Stock by reason of their ownership of such
stock, an amount per share of Series D Convertible Preferred Stock equal to the
sum of:

                    (i)  (x) the applicable Stated Value plus any declared and
unpaid dividends to the date of liquidation, plus (y) 10% of such Stated Value
per annum, calculated from the date of issuance of such share through date of
payment of the Liquidation Preference as set forth in this Section 3 ((x) and
(y), collectively, the "Stated Preference"); plus

                    (ii) an amount equal to such amount per share of Series D
Preferred Stock as would have been payable had each share of Series D Preferred
Stock and all outstanding shares of Convertible Preferred Stock (to the extent
such shares of other Convertible Preferred Stock are actually converted into
Common Stock at such time or if such shares of other Convertible Preferred Stock
contain a participation feature which allows them to receive amounts in excess
of their Stated Preference without actually being converted) been converted into
Common Stock immediately prior to such Liquidation of the Corporation after
giving effect to the full payment of the Stated Preference under the preceding
paragraph (i) and the stated preference of the other Preferred Stock (unless
such other Preferred Stock has actually been converted into Common Stock);
provided, that if the amount payable per share of Series D Convertible Preferred
Stock pursuant to the foregoing paragraphs (i) and (ii) exceeds three and
one-half (3-1/2) multiplied by the Stated Preference (the "Maximum Amount"),
each holder of Series D Convertible Preferred Stock shall only be entitled to
receive such Maximum Amount. The sum of the amounts in (i) and (ii) above is
referred to herein as the "Liquidation Preference".

After the payment of the full Liquidation Preference on account of all shares of
Series D Convertible Preferred Stock as set forth in this Section 3 and any
preferential amounts to which the holders of Parity Securities are entitled, the
remaining assets of the Corporation legally

                                       2

<PAGE>

available for distribution, if any, shall be distributed ratably to the holders
of the Common Stock. If the assets and funds legally available for distribution
among the holders of Series D Convertible Preferred Stock shall be insufficient
to permit the payment to the holders of the full aforesaid Liquidation
Preference, then the assets and funds shall be distributed ratably among holders
of Series D Convertible Preferred Stock in proportion to the number of shares of
Series D Convertible Preferred Stock owned by each holder. If the assets and
funds of the Corporation available for distribution to stockholders upon any
Liquidation of the Corporation, whether voluntary or involuntary, shall be
insufficient to permit the payment to holders of the full aforesaid Liquidation
Preference and amounts payable to holders of outstanding Parity Securities, the
holders of Series D Convertible Preferred Stock and the holders of such other
Parity Securities shall share ratably (and ratably as to cash, in-kind or other
distributions) in any distribution of assets of the Corporation in proportion to
the full respective preferential amounts to which they are entitled.

          (b)  Except as described in the following sentence, a merger,
recapitalization, reorganization, sale of voting control to a single buyer or a
group of related buyers in one or a series of related transactions, or other
business combination transaction involving the Corporation in which the
shareholders of the Corporation immediately prior to the consummation of such
transaction do not own at least a majority of the outstanding shares of the
surviving corporation or the Corporation (as applicable) immediately following
the consummation of such transaction or sale of all or substantially all of the
assets of the Corporation (collectively, a "Liquidation Event") shall be deemed
to be a Liquidation of the Corporation. Notwithstanding the foregoing, the
following shall not be deemed to be a Liquidation Event: (i) a merger,
recapitalization, sale of voting control or other business combination
transaction with an Affiliate (as such term is defined in Section 12b-2 of the
Rules and Regulations under the Securities Exchange Act of 1934, as amended) of
UBS Capital Americas III, L.P. or UBS Capital LLC (together with any such
Affiliate, "UBS"), or (ii) a merger of the Corporation with a public company (A)
in which the merger consideration to be received by the holders of the Series D
Convertible Preferred Stock is fully registered marketable securities (the
"Merger Shares") which are not subject to any restrictions on transfer, (B) in
which the value of such merger consideration for each share of Series D
Convertible Preferred Stock, valued at the average closing price of the Merger
Shares for the 30 days prior to the consummation of the merger, or such lesser
period which follows the public announcement of the merger, is greater than 110%
of the Liquidation Preference per share as of the date of consummation of the
merger, and (C) with aggregate trading volume for the 30 calendar days prior to
the merger date of at least 10 times the aggregate number of Merger Shares
received by all holders of Convertible Preferred Stock.

          (c)  In any Liquidation Event, if the consideration received by the
Corporation is other than cash, its value will be deemed its fair market value
as determined in good faith by the Board of Directors. Any securities shall be
valued as follows:

                    (i)  Securities not subject to investment letter or other
similar restrictions on free marketability covered by subsection (ii) below:

                    (A)  If traded on a securities exchange or through The
     Nasdaq National Market or Small Cap Market, the value shall be deemed to be
     the average of the

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<PAGE>

     closing prices of the securities on such quotation system over the thirty
     (30) day period ending three (3) days prior to the closing of the
     Liquidation Event;

                    (B)   If actively traded over-the-counter, the value shall
     be deemed to be the average of the closing bid or sale prices (whichever is
     applicable) over the thirty (30) day period ending three (3) days prior to
     the closing of the Liquidation Event; and

                    (C)   If there is no active public market, the value shall
     be the fair market value thereof, as mutually determined by the Board of
     Directors and the holders of at least a majority of the voting power of all
     then outstanding shares of Convertible Preferred Stock, voting as a single
     class.

                    (ii)  The method of valuation of securities subject to
investment letter or other restrictions on free marketability (other than
restrictions arising solely by virtue of a shareholder's status as an affiliate
or former affiliate) shall be to make an appropriate discount from the market
value determined as above in subsections (i)(A), (B) or (C) to reflect the
approximate fair market value thereof, as mutually determined by the Board of
Directors and the holders of at least a majority of the voting power of all then
outstanding shares of Convertible Preferred Stock, voting as a single class.

     4.   VOTING RIGHTS.

          In addition to any voting rights provided elsewhere herein or in the
Corporation's Certificate of Incorporation, as it may be amended or restated
from time to time (the "Certificate of Incorporation"), and any voting rights
provided by law, the holders of shares of Series D Convertible Preferred Stock
shall have the following voting rights:

          (a)  Election of Directors.

                    (i)   Subject to the terms hereof, the holders of the Series
D Preferred Stock, together with the holders of any other class or series of
Convertible Preferred Stock, the terms of which expressly entitle the holder
thereof to vote in the election of directors designated by holders of
Convertible Preferred Stock (collectively, "Voting Preferred Stock") shall have
the right to elect four (4) directors, one (1) of which shall be an Independent
Director (as defined below). Such directors shall be elected by the holders of
at least a majority of the voting power of all then outstanding shares of Voting
Preferred Stock, voting as a single class. "Independent Director" has the
meaning specified in Rule 4200(a)(14) 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.

                    (ii)  Any director elected by the holders of Voting
Preferred Stock shall be referred to herein as a "Preferred Director." Subject
to Section 4(a)(v), the initial term of any director to be appointed pursuant to
Section 4(a)(i) will commence upon his/her election by the holders of Voting
Preferred Stock and shall expire at the first annual meeting of stockholders of
the Corporation following his/her election. Upon expiration of the initial term
of such Preferred Director, so long as the Voting Preferred Stock is
outstanding, the holders of such Voting Preferred Stock shall have the right to
elect a Preferred Director to replace such director

                                       4

<PAGE>

in the same manner described above in Section 4(a)(i). Subject to Section
4(a)(v), a Preferred Director so elected shall hold office for a term expiring
at the annual meeting of stockholders in the year following the election of such
director. Notwithstanding the foregoing, but subject to Section 4(a)(v), a
Preferred Director elected under Section 4(a)(i) shall serve until such
Preferred Director's successor is duly elected and qualified or until such
director's earlier removal as provided in Section 4(a)(iii) or death or
resignation and, in the event a vacancy occurs, a replacement Preferred Director
shall be selected as provided in Section 4(a)(i).

                    (iii) A Preferred Director may be removed by, and shall not
be removed except by, the vote of at least a majority of the voting power of all
then outstanding shares of Voting Preferred Stock, voting as a single class.

                    (iv)  The Corporation shall at all times reserve and keep
available sufficient vacant seats on the Board of Directors solely for the
purpose of enabling the holders of the Voting Preferred Stock to designate
Preferred Directors as provided in this Section 4(a).

                    (v)   This Section 4(a) shall survive a Qualified Public
Offering (as defined in Section 5(b) below) and until such time thereafter as
less than an aggregate of 25% of the authorized Convertible Preferred Stock
remains outstanding.

          (b)  Certain Corporate Actions. Until a Qualified Public Offering or
until such time as less than an aggregate of 25% of the authorized Convertible
Preferred Stock remains outstanding, the Corporation shall not, and shall not
permit any of its subsidiaries to, without first obtaining the affirmative vote
or written consent of the holders of at least a majority of the voting power of
all then outstanding shares of Convertible Preferred Stock, voting as a single
class:

                    (A)   amend, repeal, modify or supplement any provision of
     the Certificate of Incorporation (including any certificate of designation
     forming a part thereof), the Bylaws of the Corporation, or any successor
     certificate of incorporation or bylaws or this Certificate of Designation,
     Number, Powers, Preferences and Relative, Participating, Optional and Other
     Rights of Series D Convertible Preferred Stock (the "Certificate of
     Designation");

                    (B)   authorize or permit the Corporation or any subsidiary
     of the Corporation to issue any capital stock or any options, warrants or
     other rights exchangeable or exercisable therefor, other than (i) shares of
     Series D Convertible Preferred Stock pursuant to the Preferred Stock
     Purchase Agreement, dated as of February 19, 2002, among the Corporation,
     UBS, LSC, LLC and International Technology Investments, LC (the "Preferred
     Stock Purchase Agreement"), (ii) Common Stock upon conversion of
     Convertible Preferred Stock, or upon the exercise of stock options to
     purchase up to 4,243,037 shares of Common Stock, (iii) shares of Class I
     Series B Preferred Stock issued upon conversion of Class II Series B
     Preferred Stock, (iv) securities issued as consideration for any
     acquisition approved by a majority of the Board of Directors (including the
     affirmative vote of the Preferred Directors), (v) up to $15 million of
     Common Stock, issued as consideration for any acquisition approved by a
     majority of the Board of Directors (without the affirmative vote of the
     Preferred

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<PAGE>

     Directors), provided such Common Stock is valued at no less than the
     greater of (1) the Stated Value (as adjusted for stock splits,
     combinations, stock dividends and the like) and (2) the average of the
     closing price for the Common Stock for the 30 days prior to the issuance,
     (vi) a warrant to purchase 210,000 shares of Common Stock to Spinway, Inc.
     (the "Spinway Warrant"), (vii) 210,000 shares of Common Stock upon exercise
     of the Spinway Warrant, (viii) shares of Common Stock in exchange for
     shares of common stock, par value $.001 per share ("Tutopia Stock"), of
     Tutopia.com, Inc. ("Tutopia"), upon a change-in-control of the Corporation
     pursuant to the Stockholders Agreement, dated as of April 24, 2000, by and
     among the Corporation, Tutopia and the other parties signatory thereto (the
     "Tutopia Stockholders Agreement") or (ix) shares of Common Stock and/or
     Convertible Preferred Stock issued pursuant to that certain Amended and
     Restated Put Agreement, dated as of June 27, 2002 among the Corporation,
     UBS and the other parties named therein (the "Tutopia Put Agreement"); and
     (x) a warrant dated February 19, 2002 for 500,000 shares issued to Lucent
     Technologies Inc. and any shares of Common Stock issued on exercise of such
     warrant;

                    (C)  reclassify any class or series of any Common Stock into
     shares having any preference or priority as to dividends or liquidation
     superior to or on a parity with any such preference or priority of
     Convertible Preferred Stock;

                    (D)  authorize or effect, in a single transaction or through
     a series of related transactions, (1) a liquidation, winding up or
     dissolution of the Corporation or adoption of any plan for the same; (2) a
     Liquidation Event; or (3) any direct or indirect purchase or other
     acquisition by the Corporation or any of its subsidiaries of any capital
     stock (other than the Convertible Preferred Stock pursuant to its terms);

                    (E)  enter into or otherwise become a party to any agreement
     whereby any shareholder or shareholders of the Corporation shall transfer
     capital stock of the Corporation to an independent third party or a group
     of independent third parties pursuant to which such parties acquire capital
     stock of the Corporation possessing the voting power to elect a majority of
     the Board of Directors;

                    (F)  declare or pay or set aside for payment any dividend or
     distribution or other payment upon the Common Stock or upon any other
     Junior Stock, nor redeem, purchase or otherwise acquire any Common Stock or
     other Junior Stock for any consideration (or pay or make available any
     moneys, whether by means of a sinking fund or otherwise, for the redemption
     of or other distribution or payment with respect to any shares of any
     Common Stock or other Junior Stock), except for the repurchase of shares of
     Common Stock from directors, consultants or employees of the Corporation or
     any subsidiary pursuant to agreements approved by the disinterested
     directors on the Board of Directors, under which the Corporation has the
     right to repurchase such shares upon the occurrence of certain events,
     including but not limited to, termination of employment or services;

                    (G)  approve the annual budget of the Corporation and its
     subsidiaries (the "Annual Budget");

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                    (H)  enter into any financial commitment over and above
     those approved in the annual budget in excess of $15 million in the
     aggregate (for the Corporation and its subsidiaries, taken together),
     except as prescribed in the Annual Budget;

                    (I)  dismiss or hire or modify or enter into any employment
     agreement, non-competition agreement, bonus or stock issuance arrangements
     or other compensation (including, without limitation, fringe benefit)
     arrangements with its President, Chief Executive Officer or Chief Financial
     Officer, or other equivalent or senior level officer;

                    (J)  permit the creation or existence of any lien, mortgage,
     pledge, hypothecation, assignment, security interest, charge or
     encumbrance, or preference, priority or other security agreement or
     preferential arrangement of any kind or nature whatsoever on any of the
     Corporation's or any of its subsidiaries' assets with an aggregate value in
     excess of $15 million, except as part of any financing in the ordinary
     course of business;

                    (K)  make any capital expenditure in any fiscal year in
     excess of $15 million in the aggregate (for the Corporation and its
     subsidiaries, taken together), except as prescribed in the Annual Budget;

                    (L)  acquire any assets or equity or other interest in any
     other entity with a value in excess of $15 million in the aggregate (for
     the Corporation and its subsidiaries, taken together), except as prescribed
     in the Annual Budget;

                    (M)  incur indebtedness for borrowed money (including,
     without limitation, any capitalized lease obligations, accounts receivable
     financing or other asset-backed financing), any guarantee or other similar
     contingent obligation or any lease financing (whether a capitalized lease,
     operating lease, pursuant to a sale leaseback arrangement or otherwise), in
     excess of $15 million in the aggregate (for the Corporation and its
     subsidiaries, taken together), except as prescribed in the Annual Budget;

                    (N)  amend, supplement, restate, revise, waive or otherwise
     modify any stock option plan, agreement or other arrangement of the
     Corporation (each, a "Stock Option Plan"), as in effect on February 19,
     2002;

                    (O)  create or adopt any stock option plan, stock
     appreciation rights plan, bonus plan or similar plan that was not in
     existence on February 19, 2002, except as approved by the Compensation
     Committee of the Board of Directors;

                    (P)  dispose of or acquire assets with a value in excess of
     $15 million other than in the normal course of business;

                    (Q)  liquidate, dissolve or voluntarily elect to commence
     bankruptcy or insolvency proceedings under applicable laws;

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<PAGE>

                         (R) change in any material respect the nature of the
     business of the Corporation and its subsidiaries taken as a whole;

                         (S) enter into any transaction, or any agreement or
     understanding with any affiliate of the Corporation or any subsidiary
     thereof, other than a wholly-owned subsidiary of the Corporation;

                         (T) (i) solicit or negotiate any inquiries or proposals
     with respect to (x) any direct or indirect issuance, sale, disposition or
     redemption of any securities of Latin Guide, Inc. ("LGI"), Tutopia or any
     of Tutopia's subsidiaries, (y) the direct or indirect sale or disposition
     of all or any material portion of the assets or business of LGI, Tutopia or
     any of Tutopia's subsidiaries, or (z) any merger, reorganization,
     consolidation or recapitalization or other similar transaction involving
     LGI, Tutopia or any of Tutopia's subsidiaries; or (ii) discuss with or
     provide to any person or entity information of LGI, Tutopia or any of
     Tutopia's subsidiaries with respect to or in contemplation of any of the
     foregoing; or

                         (U) agree to do any of the foregoing.

                  (c) Additional Voting Rights. Except as required by law, the
holders of Series D Convertible Preferred Stock shall be entitled to notice of
any stockholders' meeting and to vote together as a single class with the
holders of Common Stock (and any other capital stock of the Corporation entitled
to vote), on an as-converted basis, upon any matter submitted to the
stockholders for a vote as follows: (i) the holders of the Series D Convertible
Preferred Stock shall have 1.54 votes per share of Series D Convertible
Preferred Stock, (ii) the holders of any other series of Convertible Preferred
Stock shall be entitled to the number of votes specified in the Certificate of
Designation creating that series of Convertible Preferred Stock, and (iii) the
holders of Common Stock shall have one (1) vote per share of Common Stock.

                  (d) Manner of Voting. Whenever a vote of the holders of Series
A Convertible Preferred Stock, Series B Convertible Preferred Stock, Series C
Convertible Preferred Stock, Series D Preferred Stock and/or other shares of
Convertible Preferred Stock shall be taken pursuant to the provisions of this
Certificate of Designation or otherwise, the holders of Series D Convertible
Preferred Stock and the holders of the other Convertible Preferred Stock shall
be entitled to the number of votes specified in the Certificate of Designation
creating that series of Convertible Preferred Stock.

         5.       CONVERSION.

                  Shares of Series D Convertible Preferred Stock may be
converted into shares of Common Stock, on the terms and conditions set forth in
this Section 5.

                  (a) Optional Conversion.

                         (i) At any time and from time to time, each holder of
shares of Series D Preferred Stock may, upon written notice to the Corporation,
convert all or any portion of such shares held by such holder into the number of
shares of Common Stock determined by dividing (x) the applicable Stated
Preference multiplied by the number of shares surrendered for

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conversion plus any declared but unpaid dividends on such shares, by (y) the
Conversion Price on the date of conversion determined in accordance with Section
5(c).

                         (ii) References in this Section 5 to "Common Stock"
shall include all stock or other securities or property (including cash) into
which Common Stock is converted following any merger, reorganization or
reclassification of the capital stock of the Corporation.

               (b) Mandatory Conversion. Each share of Series D Convertible
Preferred Stock shall automatically be converted into such number of shares of
Common Stock as is determined by dividing (x) the Stated Preference multiplied
by the number of shares surrendered for conversion plus any declared but unpaid
dividends on such shares, by (y) the Conversion Price on the date of conversion
determined in accordance with Section 5(c), without further action by the
holders of such shares and whether or not the certificates representing such
shares are surrendered to the Corporation or its transfer agent, upon the
closing of an underwritten public offering of shares of Common Stock for which
the Corporation has obtained a firm commitment from one or more underwriter(s)
for at least: $60 million of Common Stock and in which the Corporation receives
gross proceeds from the sale of Common Stock to the public of at least $45
million (before deduction of underwriter's discounts and commissions), and which
values the equity of the Corporation at no less than $200 million pre-offering
(a "Qualified Public Offering"). Except for the purposes of the calculation in
the immediately preceding sentence, in the event of a Qualified Public Offering,
the person(s) entitled to receive the Common Stock issuable upon conversion of
Series D Convertible Preferred Stock shall not be deemed to have converted such
Series D Convertible Preferred Stock until the closing of such offering.

               (c) Conversion Price. The Conversion Price per share for the
Series D Convertible Preferred Stock shall be Three Dollars ($3.00), subject to
adjustment as provided in Section 6 hereof.

               (d) Common Stock. The Common Stock to be issued upon conversion
hereunder shall be fully paid and nonassessable.

               (e) Procedures for Conversion.

                         (i) In order to convert shares of Series D Preferred
Stock into shares of Common Stock pursuant to Section 5(a) (or, in the case of
an automatic conversion of Series D Preferred Stock pursuant to Section 5(b), to
receive a certificate for such holder's shares of Common Stock outstanding as a
result of such conversion), the holder shall surrender the certificate or
certificates therefore, duly endorsed for transfer, at any time during normal
business hours, to the Corporation at its principal or at such other office or
agency then maintained by it for such purpose (the "Payment Office"),
accompanied, in the case of a conversion pursuant to Section 5(a), by written
notice to the Corporation of such holder's election to convert and (if so
required by the Corporation or any conversion agent) by an instrument of
transfer, in form reasonably satisfactory to the Corporation and to any
conversion agent, duly executed by the registered holder or by his duly
authorized attorney, and any taxes required pursuant to Section 5(e)(iii). As
promptly as practicable after the surrender for conversion of any share of

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<PAGE>

Series D Convertible Preferred Stock in the manner provided in the preceding
sentence, and the payment in cash of any amount required by the provisions of
Section 5(e)(iii), but in any event within five Trading Days of such surrender
for payment, the Corporation will deliver or cause to be delivered at the
Payment Office to or upon the written order of the holder of such shares,
certificates representing the number of full shares of Common Stock issuable
upon such conversion, issued in such name or names as such holder may direct.
Such conversion shall be deemed to have been made immediately prior to the close
of business on the date of such surrender of the shares in proper order for
conversion, and all rights of the holder of such shares as a holder of such
shares shall cease at such time and the person or persons in whose name or names
the certificates for such shares of Common Stock are to be issued shall be
treated for all purposes as having become the record holder or holders thereof
at such time; provided, however, that any such surrender and payment on any date
when the stock transfer books of the Corporation shall be closed shall
constitute the person or persons in whose name or names the certificates for
such shares of Common Stock are to be issued as the record holder or holders
thereof for all purposes immediately prior to the close of business on the next
succeeding day on which such stock transfer books are opened and such conversion
shall be at the Conversion Price in effect at such time on such succeeding day.

          For purposes hereof, "Trading Day" shall mean (i) any day on which
stock is traded on the principal stock exchange on which the Common Stock is
listed or admitted to trading, (ii) if the Common Stock is not then listed or
admitted to trading on any stock exchange but is traded on the Nasdaq Stock
Market, any day on which stock is traded on the Nasdaq Stock Market, or (iii) if
the Common Stock is not then traded on the Nasdaq Stock Market, any day on which
stock is traded in the over-the-counter market, as reported by the National
Quotation Bureau Incorporated (or any similar organization or agency succeeding
to its functions of reporting prices).

               (ii)  The Corporation shall not be required to issue fractional
shares of Common Stock upon conversion of shares of Series D Convertible
Preferred Stock. At the Corporation's discretion, in the event the Corporation
determines not to issue fractional shares, in lieu of any fractional shares to
which the holder would otherwise be entitled, the Corporation shall pay cash
equal to such fraction multiplied by the closing price of the Common Stock on
the date of conversion.

               (iii) The issuance of certificates for shares of Common Stock
upon conversion shall be made without charge for any issue, stamp or other
similar tax in respect of such issuance. However, if any such certificate is to
be issued in a name other than that of the holder of record of the shares
converted, the person or persons requesting the issuance thereof shall pay to
the Corporation the amount of any tax which may be payable in respect of any
transfer involved in such issuance or shall establish to the satisfaction of the
Corporation that such tax has been paid or is not payable.

          (f) Reservation of Stock Issuable Upon Conversion. The Corporation
shall reserve and keep available out of its authorized but unissued shares of
Common Stock, solely for the purpose of effecting the conversion of the shares
of the Series D Convertible Preferred Stock, 17,019,350 shares of Common Stock.
If at any time the number of authorized but unissued shares of Common Stock
shall not be sufficient to effect the conversion of all then outstanding

                                       10

<PAGE>

shares of the Series D Convertible Preferred Stock without regard to whether the
holders of Series D Convertible Preferred Stock are then entitled to convert,
the Corporation will take such corporate action as may, in the opinion of its
counsel, be necessary to increase its authorized but unissued shares of Common
Stock to such number of shares as shall be sufficient for such purpose,
including, without limitation, taking appropriate board action, recommending
such an increase to the holders of Common Stock, holding shareholders meetings,
soliciting votes and proxies in favor of such increase to obtain the requisite
stockholder approval and upon such approval, the Corporation shall reserve and
keep available such additional shares solely for the purpose of effecting the
conversion of the shares of the Series D Convertible Preferred Stock.

          (g) Merger, Etc.

                    (i) Notwithstanding any other provision hereof, in case of
any merger or other business combination transaction involving the Corporation
which does not constitute a Liquidation Event, then, concurrently with the
consummation of such transaction, provision shall be made so that each share of
Series D Convertible Preferred Stock shall thereafter be convertible into the
number of shares of stock or other securities or property (including cash) to
which a holder of the number of shares of Common Stock deliverable upon
conversion of such share of Series D Convertible Preferred Stock would have been
entitled assuming conversion immediately prior to the closing of the
transaction.

                    (ii) In case of any merger or other business combination
transaction involving the Corporation which does not constitute a Liquidation
Event, in which the Corporation is not the surviving entity, and the Corporation
or the holders do not otherwise convert all outstanding shares of Series D
Convertible Preferred Stock, the Series D Convertible Preferred Stock shall be
converted into or exchanged for and shall become shares of the surviving
corporation having, in respect of the surviving corporation, substantially the
same powers, preferences and relative participating, optional or other special
rights, and the qualifications, limitations or restrictions thereon, that the
Series D Convertible Preferred Stock had immediately prior to such transaction.

     6.   ADJUSTMENTS.

          The Conversion Price shall be subject to adjustment from time to time
as set forth in this Section 6. The Corporation shall give holders of Series D
Convertible Preferred Stock notice of any event described below which requires
an adjustment pursuant to this Section 6 at the time of such event.

          (a) Definitions. As used in this Section 6, the following terms have
the respective meanings set forth below:

          "Additional Shares of Common Stock" shall mean all shares of Common
Stock issued by the Corporation after the Closing (as defined in the Preferred
Stock Purchase Agreement).

          "Convertible Securities" shall mean evidences of indebtedness, shares
of stock of other securities which are convertible into or exchangeable, with or
without payment of

                                       11

<PAGE>

additional consideration in cash or property, for Additional Shares of Common
Stock, either immediately or upon the occurrence of a specified date or a
specified event.

          "Fully Diluted Outstanding" shall mean, when used with reference to
Common Stock, at any date as of which the number of shares thereof is to be
determined, all shares of Common Stock Outstanding at such date and all shares
of Common Stock issuable in respect of Series D Convertible Preferred Stock
outstanding on such date and other securities convertible into, or options or
warrants to purchase, shares of Common Stock outstanding on such date, whether
or not such options, warrants or other securities are presently convertible or
exercisable.

          "Other Property" shall have the meaning set forth in Section 6(i).

          "Outstanding" shall mean, when used with reference to Common Stock, at
any date as of which the number of shares thereof is to be determined, all
issued shares of Common Stock, except shares then owned or held by or for the
account of the Corporation or any subsidiary of the Corporation, and shall
include all shares issuable in respect of outstanding scrip or any certificates
representing fractional interests in shares of Common Stock.

          "Overage" shall mean the total number of shares of Common Stock issued
in connection with the Subject Transactions above the Share Allowance.

          "Permitted Issuances" shall mean (i) the issuance of up to 4,243,037
shares of Common Stock issuable pursuant to options to purchase Common Stock
under the Stock Option Plan, (ii) shares of Common Stock issued or issuable in
connection with a Qualified Public Offering, (iii) shares of Common Stock issued
in connection with the Subject Transactions or upon conversion of Convertible
Preferred Stock, (iv) shares of Class I Series B Preferred Stock issued upon
conversion of the Class II Series B Preferred Stock, (v) securities issued as
consideration for any acquisition approved by a majority of the Board of
Directors (including the affirmative vote of the Preferred Directors), (vi) the
issuance of an aggregate of up to 100,000 additional shares of Common Stock (as
adjusted for stock splits, combinations, stock dividends and the like) in
transactions approved by a majority of the Board of Directors, (vii) the
issuance of an aggregate of up to another 100,000 additional shares of Common
Stock (as adjusted for stock splits, combinations, stock dividends and the like)
in transactions approved by a majority of the Board of Directors (including the
affirmative vote of the Preferred Directors), (viii) the Spinway Warrant, (ix)
210,000 shares of Common Stock upon exercise of the Spinway Warrant, (x) shares
of Common Stock and/or Convertible Preferred Stock issued pursuant to the
Tutopia Put Agreement, (xii) such other issuances as shall be approved in
advance by the holders of at least a majority of the voting power of all then
outstanding shares of Convertible Preferred Stock, voting as a single class;
(xiii) a warrant dated February 19, 2002 for 500,000 shares issued to Lucent
Technologies Inc. and any shares of Common Stock issued on exercise of such
warrant;

          "Qualified Private Offering" shall mean a private equity offering to
investors other than UBS resulting in gross proceeds to the Corporation of at
least $30 million, in which the securities issued contain anti-dilution
provisions no more favorable to the investor than the anti-dilution provisions
of the Series D Convertible Preferred Stock which take effect following the
consummation of a Qualified Private Offering.

                                       12

<PAGE>

          "Share Allowance" shall mean 428,571 shares of Common Stock.

          "Stock Option Plan" shall mean the IFX Corporation Directors Stock
Option Plan, the 1998 IFX Corporation Stock Option and Incentive Plan, as
amended, and the IFX Corporation 2001 Stock Option Plan.

          "Subject Transactions" shall mean (i) any acquisition consummated
prior to the filing hereof, including, without limitation, the acquisitions of
Mr. Help Informatica S/C Ltda., Zupernet Ltda. and Redescape, L.L.C., (ii) the
Consulting Agreement, dated as of May 27, 1999 by and between the Corporation
and Brian Reale and (iii) the conversion of Tutopia Stock into Common Stock
pursuant to the Tutopia Stockholders Agreement.

          (b)  Stock Dividends, Subdivisions and Combinations. If at any time
the Corporation shall:

                    (i)   take a record of the holders of its Common Stock for
the purpose of entitling them to receive a dividend payable in, or other
distribution of, Additional Shares of Common Stock,

                    (ii)  subdivide its outstanding shares of Common Stock into
a larger number of shares of Common Stock, or

                    (iii) combine its outstanding shares of Common Stock into a
smaller number of shares of Common Stock, then the applicable Conversion Price
immediately after the occurrence of any such event shall be adjusted to equal
the product of (A) the Conversion Price immediately prior to the occurrence of
such event and (B) a fraction, the numerator of which shall be the number of
Fully Diluted Outstanding shares of Common Stock immediately prior to the
occurrence of such event and the denominator of which shall be the number of
Fully Diluted Outstanding shares of Common Stock immediately after the
occurrence of such event.

          (c)  Issuance of Additional Shares of Common Stock.

                    (i)   In the event that prior to the consummation of or in
connection with a Qualified Private Offering, the Corporation shall issue or
sell any Additional Shares of Common Stock, other than Permitted Issuances, for
a consideration per Additional Share of Common Stock less than 1/5 of the
applicable Conversion Price, then the applicable Conversion Price shall be
reduced to five (5) times the consideration per Additional Share of Common Stock
paid for such Additional Shares of Common Stock.

                    (ii)  In the event that following the consummation of a
Qualified Private Offering, the Corporation shall issue or sell any Additional
Shares of Common Stock, other than Permitted Issuances, for a consideration per
Additional Share of Common Stock less than 1/5 of the applicable Conversion
Price, then the applicable Conversion Price shall be reduced to a price equal to
five (5) times the amount determined by dividing (A) an amount equal to the sum
of (x) the number of Fully Diluted Outstanding shares of Common Stock
immediately prior to such issue or sale multiplied by 1/5 of the then existing
Conversion Price

                                       13

<PAGE>

plus (y) the aggregate consideration, if any, received by the Corporation upon
such issue or sale, by (B) the total number of Fully Diluted Outstanding shares
of Common Stock outstanding immediately after such issue or sale.

                    (iii) The provisions of this Section 6(c) shall not apply to
any issuance of Additional Shares of Common Stock for which an adjustment is
provided under Section 6(b). No adjustment shall be made under this Section 6(c)
upon the issuance of any Additional Shares of Common Stock which are issued
pursuant to the exercise of any warrants or other subscription or purchase
rights or pursuant to the exercise of any conversion or exchange rights in any
Convertible Securities, if any such adjustment shall previously have been made
upon the issuance of such warrants or other rights or upon the issuance of such
Convertible Securities (or upon the issuance of any warrant or other rights
therefor) pursuant to Section 6(d) or Section 6(e).

          (d)  Issuance of Warrants or Other Rights. Except with respect to
Permitted Issuances, if at any time the Corporation shall take a record of the
holders of its Common Stock for the purpose of entitling them to receive a
distribution of, or shall in any manner (whether directly or by assumption in a
merger in which the Corporation is the surviving corporation) issue or sell, any
warrants or other rights to subscribe for or purchase any Additional Shares of
Common Stock or any Convertible Securities, whether or not the rights to
exchange or convert thereunder are immediately exercisable, and the price per
share for which Common Stock is issuable upon the exercise of such warrants or
other rights or upon conversion or exchange of such Convertible Securities shall
be less than one-fifth the applicable Conversion Price in effect immediately
prior to the time of such distribution, issue or sale, then the applicable
Conversion Price shall be adjusted as provided in Section 6(c)(i) or (ii), as
applicable, on the basis that (i) the maximum number of Additional Shares of
Common Stock issuable pursuant to all such warrants or other rights or necessary
to effect the conversion or exchange of all such Convertible Securities shall be
deemed to have been issued and outstanding, (ii) the price per share for such
Additional Shares of Common Stock shall be deemed to be the lowest price per
share at which such Additional Shares of Common Stock are issuable to such
holders, and (iii) the Corporation shall have received all of the consideration,
if any, payable for such warrants or other rights as of the date of the actual
issuance thereof. No further adjustments of the Conversion Price shall be made
upon the actual issue of such Common Stock or of such Convertible Securities
upon exercise of such warrants or other rights or upon the actual issue of such
Common Stock upon such conversion or exchange of such Convertible Securities.

          (e)  Issuance of Convertible Securities. Except with respect to
Permitted Issuances, if at any time the Corporation shall take a record of the
holders of its Common Stock for the purpose of entitling them to receive a
distribution of, or shall in any manner (whether directly or by assumption in a
merger in which the Corporation is the surviving corporation) issue or sell, any
Convertible Securities, whether or not the rights to exchange or convert
thereunder are immediately exercisable, and the price per share for which Common
Stock is issuable upon such conversion or exchange shall be less than one-fifth
the applicable Conversion Price in effect immediately prior to the time of such
issue or sale, then the applicable Conversion Price shall be adjusted as
provided in Section 6(c)(i) or (ii), as applicable, on the basis that (i) the
maximum number of Additional Shares of Common Stock issuable upon the conversion
or exchange of all such Convertible Securities shall be deemed to have been
issued and outstanding,

                                       14

<PAGE>

(ii) the price per share of such Additional Shares of Common Stock shall be
deemed to be the lowest possible price in any range of prices at which such
Additional Shares of Common Stock are available to such holders, and (iii) the
Corporation shall have received all of the consideration payable therefor, if
any, as of the date of actual issuance of such Convertible Securities. No
further adjustment of the Conversion Price shall be made under this Section 6(e)
upon the issuance of any Convertible Securities which are issued pursuant to the
exercise of any warrants or other subscription or purchase rights therefor, if
any such adjustment shall previously have been made upon the issuance of such
warrants or other rights pursuant to Section 6(d). No further adjustments of the
Conversion Price shall be made upon the actual issue of such Common Stock upon
conversion or exchange of such Convertible Securities and, if any issue or sale
of such Convertible Securities is made upon exercise of any warrant or other
right to subscribe for or to purchase or any warrant or other right to purchase
any such Convertible Securities for which adjustments thereof have been or are
to be made pursuant to other provisions of this Section 6, no further
adjustments shall be made by reason of such issue or sale.

          (f)  Superseding Adjustment. If, at any time after any adjustment of
the applicable Conversion Price shall have been made pursuant to Section 6(d) or
6(e) as the result of any issuance of warrants, rights or Convertible
Securities, and either

                    (i)   such warrants or rights, or the right of conversion or
exchange in such other Convertible Securities, shall expire, and all or a
portion of such warrants or rights, or the right of conversion or exchange with
respect to all or a portion of such other Convertible Securities, as the case
may be, shall not have been exercised, or

                    (ii)  the consideration per share for which shares of Common
Stock are issuable pursuant to such warrants or rights, or such other
Convertible Securities, shall be increased or decreased by virtue of provisions
therein contained, then such previous adjustment shall be rescinded and annulled
and the Additional Shares of Common Stock which were deemed to have been issued
by virtue of the computation made in connection with the adjustment so rescinded
and annulled shall no longer be deemed to have been issued by virtue of such
computation. Thereupon, a recomputation shall be made of the effect of such
rights or options or other Convertible Securities on the applicable Conversion
Price, on the basis of

                    (iii) treating the number of Additional Shares of Common
Stock or other property, if any, theretofore actually issued or issuable
pursuant to the previous exercise of any such warrants or rights or any such
right of conversion or exchange, as having been issued on the date or dates of
any such exercise and for the consideration actually received and receivable
therefor, and

                    (iv)  treating any such warrants or rights or any such other
Convertible Securities which then remain outstanding as having been granted or
issued immediately after the time of such increase or decrease of the
consideration per share for which shares of Common Stock or other property are
issuable under such warrants or rights or other Convertible Securities.

                                       15

<PAGE>

          (g) Subject Transactions Adjustment. If the Corporation issues a
number of shares of Common Stock greater than the Share Allowance in connection
with the Subject Transactions, the Conversion Price shall be adjusted to a
dollar resulting from the following:

                                 $40,464,918
                    -------------------------------------
                   1.010948(12,919,702 + Overage) - 1,500,000

Notwithstanding the foregoing, an adjustment under this subsection (g) shall
only be made to the extent such adjustment results in a reduction of the then
current Conversion Price.

          (h)  Other Provisions Applicable to Adjustments Under This Section.
The following provisions shall be applicable to the making of adjustments
provided for in this Section 6:

                    (i) Computation of Consideration. To the extent that any
Additional Shares of Common Stock or any Convertible Securities or any warrants
or other rights to subscribe for or purchase any Additional Shares of Common
Stock or any Convertible Securities shall be issued for cash consideration, the
consideration received by the Corporation therefor shall be the amount of the
cash received by the Corporation therefor, or, if such Additional Shares of
Common Stock or Convertible Securities are offered by the Corporation for
subscription, the subscription price, or, if such Additional Shares of Common
Stock or Convertible Securities are sold to underwriters or dealers for public
offering without a subscription offering, the public offering price (in any such
case subtracting any amounts paid or receivable for accrued interest or accrued
dividends, but not subtracting any compensation, discounts or expenses paid or
incurred by the Corporation for and in the underwriting of, or otherwise in
connection with, the issuance thereof). To the extent that such issuance shall
be for a consideration other than cash, then, except as herein otherwise
expressly provided, the amount of such consideration shall be deemed to be the
fair value of such consideration at the time of such issuance as determined in
good faith by the Board of Directors. In case any Additional Shares of Common
Stock or any Convertible Securities or any warrants or other rights to subscribe
for or purchase such Additional Shares of Common Stock or Convertible Securities
shall be issued in connection with any merger in which the Corporation issues
any securities, the amount of consideration therefor shall be deemed to be the
fair value, as determined in good faith by the Board of Directors, of such
portion of the assets and business of the nonsurviving corporation as the Board
of Directors in good faith shall determine to be attributable to such Additional
Shares of Common Stock, Convertible Securities, warrants or other rights, as the
case may be. The consideration for any Additional Shares of Common Stock
issuable pursuant to any warrants or other rights to subscribe for or purchase
the same shall be the consideration received by the Corporation for issuing such
warrants or other rights plus the additional consideration payable to the
Corporation upon exercise of such warrants or other rights. The consideration
for any Additional Shares of Common Stock issuable pursuant to the terms of any
Convertible Securities shall be the consideration, if any, received by the
Corporation for issuing warrants or other rights to subscribe for or purchase
such Convertible Securities, plus the consideration paid or payable to the
Corporation in respect of the subscription for or purchase of such Convertible
Securities, plus the additional consideration, if any, payable to the
Corporation upon the exercise of the right of conversion or exchange in such
Convertible Securities. In case of the issuance at any time of any Additional
Shares of Common Stock or Convertible Securities in payment or

                                       16

<PAGE>

satisfaction of any dividends upon any class of stock other than Common Stock,
the Corporation shall be deemed to have received for such Additional Shares of
Common Stock or Convertible Securities a consideration equal to the amount of
such dividend so paid or satisfied.

                    (ii) When Adjustments to Be Made. The adjustments required
by this Section 6 shall be made whenever and as often as any specified event
requiring an adjustment shall occur. For the purpose of any adjustment, any
specified event shall be deemed to have occurred at the close of business on the
date of its occurrence.

                    (iii) When Adjustment Not Required. If the Corporation shall
take a record of the holders of its Common Stock for the purpose of entitling
them to receive a dividend or distribution or subscription or purchase rights
and shall, thereafter and before the distribution to stockholders thereof,
legally abandon its plan to pay or deliver such dividend, distribution,
subscription or purchase rights, then thereafter no adjustment shall be required
by reason of the taking of such record and any such adjustment previously made
in respect thereof shall be rescinded and annulled.

                    (iv) Escrow of Common Stock. If after any property becomes
distributable as a result of the provisions of this Section 6 by reason of the
taking of any record of the holders of Common Stock, but prior to the occurrence
of the event for which such record is taken, a holder of shares of Series D
Convertible Preferred Stock exercises its conversion rights pursuant to Section
5, any Additional Shares of Common Stock issuable and other property
distributable upon exercise by reason of such adjustment shall be held in escrow
for such holder by the Corporation to be issued to such holder upon and to the
extent that the event actually takes place. Notwithstanding any other provision
to the contrary herein, if the event for which such record was taken fails to
occur or is rescinded, then such escrowed shares shall be canceled by the
Corporation and escrowed property returned.

                    (v) Challenge to Good Faith Determination. Whenever the
Board of Directors shall be required to make a determination in good faith of
the fair value of any item under this Section 6, such determination may be
challenged in good faith by holders of a majority of the outstanding shares of
Convertible Preferred Stock, and any dispute shall be resolved by an investment
banking firm of recognized national standing selected by the Corporation and
acceptable to such holder.

                    (i) Other Action Affecting Common Stock. In case at any time
or from time to time the Corporation shall take any action in respect of its
Common Stock, other than any action described in this Section 6 for which a
specific adjustment is provided, then, unless such action will not have a
materially adverse effect upon the rights of the holders of shares of Series D
Convertible Preferred Stock, the number of shares of Common Stock or other stock
into which such shares of Series D Convertible Preferred Stock are convertible
and/or the applicable Conversion Price shall be adjusted in such manner as may
be equitable in the circumstances.

                  (j) Certain Limitations. Notwithstanding anything herein to
the contrary, the Corporation shall not enter into any transaction which, by
reason of any adjustment hereunder, would cause the applicable Conversion Price
to be less than the par value per share of Common Stock.

                                       17

<PAGE>

          (k) Notice of Adjustments. Whenever the number of shares of Common
Stock into which shares of Series D Convertible Preferred Stock are convertible
or whenever the applicable Conversion Price shall be adjusted pursuant to this
Section 6, the Corporation shall forthwith prepare a certificate to be executed
by the chief financial officer of the Corporation setting forth, in reasonable
detail, the event requiring the adjustment and the method by which such
adjustment was calculated (including a description of the basis on which the
Board of Directors determined the fair value of any consideration referred to in
Section 6(h)(i)), specifying any change in the applicable Conversion Price or
the number of shares of Common Stock into which shares of Series D Convertible
Preferred Stock are convertible and (if such adjustment was made pursuant to
Section 5(g)(i) or 6(h)) describing the number and kind of any other shares of
stock or Other Property into which shares of Series D Convertible Preferred
Stock are convertible, and any change in the applicable Conversion Price or
prices thereof, after giving effect to such adjustment or change. The
Corporation shall promptly cause a signed copy of such certificate to be
delivered to the holders of Series D Convertible Preferred Stock. The
Corporation shall keep at the Payment Office copies of all such certificates and
cause the same to be available for inspection at said office during normal
business hours by the holders of Series D Convertible Preferred Stock or any
prospective purchaser of shares of Series D Convertible Preferred Stock
designated by such holders.

     7.   TRIGGERING EVENTS.

          Any of the following actions or events shall constitute a "Triggering
Event" for purposes hereof:

          (a) Failure to Pay Dividends. The Corporation shall fail to pay any
dividend on any Series D Convertible Preferred Stock which it is required to pay
in accordance with Section 2 for any reason, including but not limited to, that
such payment is prohibited by applicable law or the Board of Directors elect not
to pay such dividend, or shall otherwise violate any term of Section 2 and such
failure shall not be cured within a period of 30 days after such violation
(which cure shall be effected in a manner ensuring the holders the same yield as
if such violation had not occurred).

          (b) Failure of Voting Rights. The Corporation shall enter into any
transaction or take any action required to be approved by holders of Series D
Convertible Preferred Stock without obtaining the requisite approval of the
holders of the Series D Convertible Preferred Stock.

          (c) Failure to Convert. The Corporation shall fail for any reason to
issue Common Stock, as required under Section 5 upon the request of any holder
of Series D Preferred Stock, as provided in Section 5 or shall fail for any
reason to comply in any material respect with any term of Section 5(f) or any
other term of Section 5 hereof.

          (d) Registration Rights Agreement. The Corporation shall fail in any
material respect to comply with the rights of the holders of Series D
Convertible Preferred Stock pursuant to the Third Amended and Restated
Registration Rights Agreement, dated as of June 27, 2002, among the Corporation,
UBS and certain other stockholders of the Corporation, and such failure shall
continue for a period of 30 days after notice from any such holder.

                                       18

<PAGE>

          (e) Preferred Stock Purchase Agreement. The Corporation shall fail to
comply with Section 6(f) or 6(g) of the Preferred Stock Purchase Agreement and
such failure shall continue for a period of 30 days after notice from the
Purchasers or the representations made under Section 4(c) or 4(u) of the
Preferred Stock Purchase Agreement shall prove to have been incorrect or
misleading in any material respect when made pursuant thereto or any other
material representation made under the Preferred Stock Purchase Agreement shall
prove to have been incorrect or misleading in any substantial material respect
when made.

          (f) There shall have occurred and be continuing a "Triggering Event"
pursuant to the terms of any other class or series of Convertible Preferred
Stock.

          (g) Notwithstanding the foregoing, if a majority of the Preferred
Directors directors affirmatively vote in favor of a transaction or other action
by the Corporation which would constitute a Triggering Event under Section 7(b)
or 7(d), such action or event shall not be considered a Triggering Event.

     8.   REMEDIES.

          (a) In the event that a Triggering Event described in Section 7 shall
occur and be continuing, each holder of Series D Convertible Preferred Stock
shall be entitled to receive all cash and other dividends, distributions and
other payments which would be paid or payable to a holder of a number of shares
of Common Stock into which the shares of Series D Convertible Preferred Stock
held by such holder are convertible at such time (without regard to the number
of shares of Common Stock which are authorized or reserved for issuance at such
time and without regard to whether such shares of Series D Convertible Preferred
Stock are then currently convertible into Common Stock at the option of the
holder).

          (b) Upon the occurrence and during the continuance of any Triggering
Event, to the extent the Preferred Directors do not already constitute a
majority of the Board of Directors, the size of the Board of Directors shall
immediately be increased by the minimum number of directors which, if all of
such additional directors were deemed "Preferred Directors," would result in
such Preferred Directors constituting a majority of the Board of Directors, and
the holders of Voting Preferred Stock shall be entitled to appoint such newly
created directors by vote of the holders of at least a majority of the voting
power of all then outstanding shares of Voting Preferred Stock, voting as a
single class.

          (c) Upon the occurrence and during the continuance of any Triggering
Event, any holder of shares of Series D Convertible Preferred Stock, at its
election, may, by notice to the Corporation (the "Put Notice"), demand
repurchase of all or any portion of such holder's shares of Series D Convertible
Preferred Stock for a cash purchase price in an amount per share equal to the
Liquidation Preference. The Corporation shall, on the date (not less than 10
business days after the date of the Put Notice) designated in such Put Notice,
repurchase from the holder such holder's shares of Series D Convertible
Preferred Stock specified in the Notice. On the date of any repurchase of shares
of Series D Convertible Preferred Stock pursuant to this Section 8(c), the
holder thereof shall surrender for redemption a certificate for the number of
shares of Series D Convertible Preferred Stock being redeemed, without any
representation or warranty (other than that the holder has good and marketable
title thereto, free and clear of liens, encumbrances

                                       19

<PAGE>

and restrictions of any kind), against payment therefor of the repurchase price
by, at the option of the holder, (i) wire transfer to an account designated by
the holder for such purpose or (ii) a certified or official bank check payable
to the order of the holder. If less than all of the holder's shares of Series D
Convertible Preferred Stock represented by a single certificate are being
redeemed, the Corporation shall cancel such certificate and issue in the name
of, and deliver to, the holder a new certificate for the portion not being
redeemed. At any time following delivery of a Put Notice but prior to the date
of repurchase, any holder of Series D Convertible Preferred Stock may, by notice
to the Corporation, withdraw the repurchase demand contained in the Put Notice.
Notwithstanding the foregoing, the holders of Series D Preferred Stock shall not
be entitled to exercise their repurchase rights hereunder unless the holders of
Convertible Preferred Stock elect to exercise such repurchase rights by vote of
the holders of at least a majority of the voting power of all then outstanding
shares of Convertible Preferred Stock, voting as a single class.

          (d)  The Corporation stipulates that the remedies at law of each
holder of Series D Convertible Preferred Stock in the event of any Triggering
Event or threatened Triggering Event or otherwise or other failure in the
performance of or compliance with any of the terms hereof are not and will not
be adequate and that, to the fullest extent permitted by law, such terms may be
specifically enforced by a decree for the specific performance of any agreement
contained herein or by an injunction against a violation of any of the terms
hereof or otherwise without requiring any holder to post a bond or other
security except to the extent required by applicable law.

          (e)  Any holder of Series D Convertible Preferred Stock shall be
entitled to recover from the Corporation the reasonable attorneys' fees and
expenses incurred by such holder in connection with any Triggering Event or
enforcement by such holder of any obligation of the Corporation hereunder.

          (f)  No failure or delay on the part of any holder of Series D
Convertible Preferred Stock in exercising any right, power or remedy hereunder
or under applicable law or otherwise shall operate as a waiver thereof; nor
shall any single or partial exercise of any such right, power or remedy preclude
any other or further exercise thereof or the exercise of any other right, power
or remedy hereunder or thereunder. The remedies herein provided are cumulative
and not exclusive of any remedies provided by law or otherwise.

     9.   PREEMPTIVE RIGHT.

          (a)  Each holder of at least 518,000 shares of Series D Convertible
Preferred Stock or Common Stock issued upon conversion of Series D Convertible
Preferred Stock (including any shares held by such person's affiliates), shall
have a right of first refusal (the "Preemptive Right") to purchase its pro rata
share, based on such holder's percentage ownership interest in the Corporation,
of New Securities (as defined below) which the Corporation, from time to time,
proposes to sell and issue (subject to such requirements and restrictions
imposed by the Securities Act of 1933, as amended, and state securities laws and
to the actual issuance of the New Securities). The pro rata shares of any holder
of Series D Convertible Preferred Stock or Common Stock issued upon conversion
of Series D Convertible Preferred Stock, for purposes of this Preemptive Right,
shall be the ratio of (i) the number of shares of Common Stock owned, of

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record or beneficially, by such holder (including all shares issuable upon
conversion of the Series D Convertible Preferred Stock, whether or not then
currently convertible, or the exercise or conversion of any other option,
warrant or convertible security held by such holder) immediately prior to the
issuance of the New Securities, to (ii) the total number of shares of Common
Stock issued and outstanding immediately prior to the issuance of the New
Securities, determined on a fully diluted basis after giving effect to the
exercise in full of then outstanding options and warrants and the conversion of
all securities convertible into shares of Common Stock; provided, however, that
if any holder of Series D Convertible Preferred Stock or Common Stock issued
upon conversion of Series D Convertible Preferred Stock does not elect to
purchase its entire pro rata share of such New Securities, then each other
holder that has elected to purchase its entire pro rata share shall have the
right to purchase up to a number of such unpurchased portion, in addition to its
own, in the proportion that (1) the number of shares of Common Stock owned, of
record or beneficially, by such holder (including all shares issuable upon
conversion of the Series D Convertible Preferred Stock, whether or not then
currently convertible, or the exercise or conversion of any other option,
warrant or convertible security held by such holder) immediately prior to the
issuance of the New Securities bears to (2) the number of shares of Common Stock
owned, of record or beneficially, by all holders of Series D Convertible
Preferred Stock or Common Stock issued upon conversion of Series D Convertible
Preferred Stock (including all shares issuable upon conversion of the Series D
Convertible Preferred Stock, whether or not then currently convertible, or the
exercise or conversion of any other option, warrant or convertible security held
by such holders) immediately prior to the issuance of the New Securities. The
overallotment mechanism set forth in this paragraph shall be repeatedly applied
until all New Securities available for purchase by holders of Series D
Convertible Preferred Stock or Common Stock issued upon conversion of Series D
Convertible Preferred Stock have been purchased or no holders remain who have
indicated a desire to purchase any unsubscribed for portion in their notice to
the Corporation.

          (b)  "New Securities" shall mean (a) any capital stock of the
Corporation, rights, options or warrants to purchase capital stock and
securities of any type whatsoever that are, or may become convertible into or
exchangeable for capital stock and (b) so-called "high yield" bonds, debt
instruments with equity like features or other similar debt instruments, which
bear a rating lower than investment-grade or are unrated, issued by the
Corporation; provided, however, that the term "New Securities" does not include
(i) the issuance of up to 4,243,037 shares of Common Stock issuable pursuant to
options to purchase Common Stock under the Stock Option Plan, (ii) shares of
Common Stock issued or issuable in connection with a Qualified Public Offering,
(iii) shares of Common Stock issued upon conversion of Convertible Preferred
Stock, (iv) shares of Class I Series B Preferred Stock issued upon conversion of
Class II Series B Preferred Stock, (v) securities issued as consideration for
any acquisition approved by a majority of the Board of Directors (including the
affirmative vote of the Preferred Directors), (vi) the Spinway Warrant, (vii)
210,000 shares of Common Stock upon exercise of the Spinway Warrant, (viii)
shares of Common Stock in exchange for shares of Tutopia Stock upon a
change-in-control of the Corporation pursuant to the Tutopia Stockholders
Agreement, (ix) shares of Common Stock and/or Convertible Preferred Stock issued
pursuant to the Tutopia Put Agreement, (x) any shares of capital stock of the
Corporation, rights, options or warrants to purchase capital stock and
securities of any type whatsoever that are, or may become convertible into or
exchangeable for capital stock that have been approved in advance by the holders
of at least a majority of the voting power of all then outstanding shares of
Convertible Preferred

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<PAGE>

Stock, voting as a single class; (xi) a warrant dated February 19, 2002 for
500,000 shares issued to Lucent Technologies Inc. and any shares of Common Stock
issued on exercise of such warrant.

          (c)  In the event the Corporation proposes to undertake an issuance of
New Securities, it shall give each holder of Series D Convertible Preferred
Stock or Common Stock issued upon conversion of Series D Convertible Preferred
Stock written notice of its intention, describing the type of New Securities and
the price and the terms upon which the Corporation proposes to issue the same.
Each such holder shall have twenty (20) days from the date of receipt of any
such notice to agree to purchase its pro rata share of such New Securities for
the price and upon the terms specified in the notice by giving written notice to
the Corporation and stating therein the quantity of New Securities to be
purchased.

          (d)  The Corporation shall have ninety (90) days after expiration of
the twenty (20) day period described in Section 9(c) to sell any New Securities
with respect to which a Preemptive Right was not exercised, at a price not less
than and upon terms no more favorable in the aggregate to the purchasers thereof
than specified in the Corporation's notice. To the extent the Corporation does
not sell all the New Securities offered within said ninety (90) day period, the
Corporation shall not thereafter issue or sell such New Securities without first
again offering such securities to each holder of Series D Convertible Preferred
Stock or Common Stock issued upon conversion of Series D Convertible Preferred
Stock in the manner provided above.

          (e)  The rights granted under this Section 9 shall expire upon the
earlier of (i) the closing of a Qualified Public Offering and (ii) such time as
less than an aggregate of 25% of the authorized Convertible Preferred Stock
remains outstanding.

     10.  RANKING.

          The Series D Convertible Preferred Stock shall rank pari passu with
the Series A Convertible Preferred Stock, Series B Convertible Preferred Stock
and Series C Convertible Preferred Stock of the Corporation (which shall
constitute Parity Securities for purposes hereof) and any other Parity
Securities with respect to amounts receivable upon a Liquidation Event,
dividends, rights and remedies upon Triggering Events or for any other purpose.

     11.  AMENDMENTS.

          This Certificate of Designation may not be amended without first
obtaining the affirmative vote or written consent of the holders of at least a
majority of the voting power of all then outstanding shares of Convertible
Preferred Stock, voting together as a single class, including the affirmative
vote or written consent of the holders of a majority of the shares of Series D
Convertible Preferred Stock.

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