Document:

<PAGE>   1
                                                                    EXHIBIT 10.6

                              AMENDED AND RESTATED
                         PRINCIPAL STOCKHOLDER'S ESCROW
                         AND CONTINGENT STOCK AGREEMENT

         This Amended and Restated Escrow and Contingent Stock Agreement (this
"Agreement") is entered into effective as of October 26, 1999, regardless of its
actual date of execution, among PentaStar Communications, Inc., a Delaware
corporation ("PentaStar" or the "Escrow Agent"), OC Mergerco 1, Inc., a Delaware
corporation (the "Acquiror"), and Jeffrey Veres ("Veres"), who is the principal
stockholder of DMA Ventures, Inc., a Colorado corporation ("Access")
(collectively, the "Parties").

                                    RECITALS

1.       The Parties are party to a Principal Stockholder's Escrow and
         Contingent Stock Agreement dated October 26, 1999 (the "Original
         Agreement"). The parties are entering into this Agreement for the
         purpose of amending and restating the Original Agreement in its
         entirety.

2.       PentaStar, the Acquiror, Access, and Veres are parties to an agreement
         and plan of merger dated August 13, 1999, under which Access will be
         merged into the Acquiror in a transaction intended to qualify as a
         tax-free reorganization under Section 368(a)(1)(A) of the Internal
         Revenue Code of 1986, as amended (the "Merger Transaction").

3.       In the Merger Transaction, Veres will receive 205,000 shares of
         PentaStar common stock and $500,000 of cash in return for his shares of
         Access.

4.       At the time of the Merger Transaction, the value of Access cannot be
         determined with certainty.

5.       The purpose of this Agreement is to provide for certain adjustments in
         the amount of stock consideration Veres will receive in the Merger
         Transaction.

         NOW, THEREFORE, the parties to this Agreement agree as follows:

                              ARTICLE 1: DIRECTIONS

1.1      ESCROWED PROPERTY:

         Veres will deposit with the Escrow Agent 68,265 shares of PentaStar
         common stock (the "Shares"), which will be held by the Escrow Agent in
         a separate account the sole assets of which will consist of the Shares
         and certain shares of PentaStar common stock issued in connection with
         the acquisition by PentaStar of certain other businesses (the "Escrow
         Account"). The certificates for the Shares shall be delivered with
         appropriate stock powers duly executed in blank.

<PAGE>   2

1.2      INSTRUCTIONS:

         The Escrow Agent shall hold and disburse the Shares pursuant to the
         instructions set forth in Schedule A, attached hereto and incorporated
         herein by reference.

1.3      ASSIGNMENT OF INTEREST:

         The assignment, transfer, conveyance, or hypothecation of any right,
         title, or interest in and to the subject matter of this Agreement is
         prohibited by any party, and no such assignment, transfer, conveyance,
         or hypothecation will be given effect.

                    ARTICLE 2: RIGHTS OF VERES IN THE SHARES

         During the term of this Agreement, (i) the Shares shall be reflected as
issued and outstanding on PentaStar's financial statements and other books and
records; (ii) Veres shall have all ownership rights with respect to the Shares,
including rights to vote such Shares and rights to any dividends paid by
PentaStar with respect to the Shares, and the books and records of PentaStar
will reflect such ownership. Upon the death or termination of employment of
Veres, the Shares will remain in the Escrow Account subject to disbursement to
Veres's legal heirs in accordance with Schedule A.

                  ARTICLE 3: PROVISIONS CONCERNING ESCROW AGENT

3.1      ESCHEAT:

         The Parties are aware that under Colorado law, escrowed property which
         is presumed abandoned may escheat to the State. The Escrow Agent shall
         have no liability to Veres, his respective heirs, legal
         representatives, and successors, should any or all of the Shares become
         escheatable or escheat by operation of law.

3.2      NON-LIABILITY:

         The Escrow Agent shall not be liable for any act or omission while
         acting in good faith and in the exercise of its own best judgment. Any
         act or omission by the Escrow Agent pursuant to the advice of its
         attorneys shall be conclusive evidence of such good faith. The Escrow
         Agent shall have the right to consult with counsel at its expense
         whenever any question arises concerning the Agreement and shall incur
         no liability for any delay reasonably required to obtain such advice of
         counsel. The Escrow Agent shall not be liable for the alteration,
         modification or elimination of any right permitted or given under the
         instructions set forth in Schedule A and/or in any document deposited
         under this Agreement pursuant to any statute of limitations or by
         reason of laches. The Escrow Agent shall have no further responsibility
         or liability whatsoever to Veres following a partial or complete
         distribution of the Shares pursuant to this Agreement. The Escrow Agent
         shall not incur any liability with respect to any act or omission in
         reliance upon any document, including any written notice or
         instructions provided for in this Agreement. In performing its
         obligations hereunder, the Escrow Agent shall be entitled to presume,
         without inquiry, the due execution, validity and effectiveness of all
         documents it receives, and also the truth and accuracy of any
         information contained therein. The Escrow Agent shall not be
         responsible or liable for any diminution in value of the Shares,
         whatsoever, for any reason.

<PAGE>   3

3.3      DISAGREEMENTS:

         If any disagreement or dispute arises between the Parties to this
         Agreement concerning the meaning or validity of any provision hereunder
         or concerning any other matter relating to this Agreement, the Escrow
         Agent:

         a.       Shall be under no obligation to act, except under process or
                  order of court, or until it has been adequately indemnified to
                  its full satisfaction, and shall sustain no liability for its
                  failure to act pending such process, court order or
                  indemnification; and

         b.       May, in its sole and absolute discretion, interplead  the
                  Shares or that portion of Shares it then holds with the
                  District Court of the City and County of Denver, State of
                  Colorado, and name the Parties in such interpleader action.
                  Upon filing the interpleader action, the Escrow Agent shall be
                  relieved of all liability as to the Shares. The Parties by
                  signing this Agreement submit themselves to the jurisdiction
                  of such Court and do appoint the Clerk of such Court as their
                  agent for the service of all process in connection with such
                  proceedings. In no event shall the institution of such
                  interpleader action impair the rights of the Escrow Agent
                  described in Section 3.2 of this Article.

                     ARTICLE 4: GENERAL TERMS AND CONDITIONS

4.1      EXTENSION OF BENEFITS:

         Subject to Section 1.3, this Agreement shall be binding upon, inure to
         the benefit of, and be enforceable by, the respective heirs, legal
         representatives, successors, and assigns of all the Parties and the
         Escrow Agent.

4.2      GOVERNING LAW:

         This Agreement shall be construed and enforced in accordance with the
         laws of the State of Colorado, without regard to the provisions of the
         laws of the State of Colorado or any other State regarding conflicts of
         laws.

4.3      NOTICES:

         All notices, requests, demands, and other communications required under
         this Agreement shall be in writing and shall be deemed to have been
         duly given if delivered personally or by certified mail, return receipt
         requested, and postage prepaid. If any notice is mailed, it shall be
         deemed given on the date such notice is deposited in the United States
         mail. If any notice is personally delivered, it shall be deemed given
         upon the date of such delivery. If notice is given to a party, it shall
         be mailed or delivered to the addresses set forth below the signature
         blocks. It shall be the responsibility of the Parties to notify the
         Escrow Agent in writing of any name or address changes.

4.4      ENTIRE AGREEMENT:

         With respect to the subject matter hereof, this Agreement sets forth
         the entire agreement and understanding of the Parties.

<PAGE>   4

4.5      AMENDMENT:

         This Agreement may be amended, modified, superseded, rescinded, or
         canceled only by a written instrument executed by the Parties.

4.6      WAIVERS:

         The failure of any party to this Agreement at any time or times to
         require performance of any provision under this Agreement shall in no
         manner affect the right at a later time to enforce the same
         performance. A waiver by any party to this Agreement of any such
         condition or breach of any term, covenant, representation, or warranty
         contained in this Agreement, in any one or more instances, shall
         neither be construed as a further or continuing waiver of any such
         condition or breach nor a waiver of any other condition or breach of
         any other term, covenant, representation, or warranty contained in this
         Agreement.

4.7      HEADINGS:

         Section headings of this Agreement have been inserted for convenience
         of reference only and shall in no way restrict or otherwise modify any
         of the terms of provisions of this Agreement.

4.8      COUNTERPARTS:

         This Agreement may be executed in one or more counterparts, each of
         which when executed shall be deemed to be an original, and such
         counterparts shall together constitute one and the same instrument.
         This Agreement may be delivered by facsimile, and facsimile signatures
         shall be treated as original signatures for all applicable purposes.

4.9      ARBITRATION.

         Any disputes arising under or in connection with this Agreement,
         including, without limitation, those involving claims for specific
         performance or other equitable relief, will be submitted to binding
         arbitration in Denver, Colorado before the Judicial Arbiter Group, but
         under the Commercial Arbitration Rules of the American Arbitration
         Association under the authority of federal and state arbitration
         statutes, and shall not be the subject of litigation in any forum. If
         the Judicial Arbiter Group is unavailable to conduct the arbitration,
         the it shall be before the American Arbitration Association. EACH
         PARTY, BY SIGNING THIS AGREEMENT, VOLUNTARILY, KNOWINGLY AND
         INTELLIGENTLY WAIVES ANY RIGHTS SUCH PARTY MAY OTHERWISE HAVE TO SEEK
         REMEDIES IN COURT OR OTHER FORUMS, INCLUDING THE RIGHT TO JURY TRIAL.
         The arbitrator shall have full authority to order specific performance
         and other equitable relief and award damages and other relief available
         under this Agreement or applicable law, but shall have no authority to
         add to, detract from, change or amend the terms of this Agreement or
         existing law. All arbitration proceedings, including settlements and
         awards, shall be confidential. The decision of the arbitrators will be
         final and binding, and judgment on the award by the arbitrators may be
         entered in any court of competent jurisdiction. THIS SUBMISSION AND
         AGREEMENT TO ARBITRATE WILL BE SPECIFICALLY ENFORCEABLE. The prevailing
         party or parties in any such arbitration in any action to enforce this
         Agreement will be entitled to recover, in addition to any other relief
         awarded by

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         the arbitrator, all reasonable costs and expenses, including fees and
         expenses of arbitrators and attorneys, incurred in connection
         therewith. If each party prevails on specific issues in the
         arbitration, the arbitrator may allocate the costs incurred by all
         parties on a basis the arbitrator deems appropriate.

          IN WITNESS WHEREOF, the Parties to this Agreement have each caused
this Agreement to be duly executed on this 12 day of January, 2000, but
effective as of October 26, 1999.

PENTASTAR COMMUNICATIONS, INC.

/s/ Craig J. Zoellner                       /s/ Jeffrey Veres
---------------------------------           -----------------------------------
By: Craig J. Zoellner                       JEFFREY VERES
Its:  Vice President

OC MERGERCO 1, INC.

/s/ Craig J. Zoellner
---------------------------------
By: Craig J. Zoellner
Its: Vice President

<PAGE>   6

                       SCHEDULE A TO THE ESCROW AGREEMENT

                         DISBURSEMENT OF THE SHARES AND
                POTENTIAL ISSUANCE OF ADDITIONAL PENTASTAR SHARES

1. Upon the occurrence of the earlier of (i) a sale of substantially all of the
assets of all of or the outstanding stock of PentaStar, or (ii) October 26, 2004
(the "Valuation Event"), the number of Adjusted Shares shall be determined
pursuant to the formula set forth below.

2. If the number of Adjusted Shares exceeds the number of Shares, (a) the Escrow
Agent shall distribute all of the Shares to Veres within 60 days of the date of
the Valuation Event; and (b) within such 60 day period, PentaStar shall issue to
Veres additional shares of PentaStar common stock equal to such excess (the
"Additional Shares"). The Parties agree that a portion of the Additional Shares
shall be treated as imputed interest under Section 483 of the Internal Revenue
Code and reported as interest for all applicable tax purposes. Notwithstanding
the foregoing, in no event shall the number of Additional Shares exceed the
number of shares of PentaStar common stock issued to Veres at the closing in the
Merger Transaction but not deposited in the Escrow Account.

3. If the number of Shares exceeds the number of Adjusted Shares, then within 60
days of the date of the Valuation Event, (a) the Escrow Agent shall retain such
excess number of Shares and (b) the Escrow Agent shall distribute the remainder
of the Shares (which shall equal the number of Adjusted Shares), to Veres.

4. The number of Adjusted Shares shall be calculated under the following
formula:

    Adjusted Shares = (Total Escrowed Shares) x (Veres Percentage)

Veres Percentage = Veres' Adjusted EBITA
                   ---------------------
      Total Operating Partner EBITA

Veres Adjusted EBITA = (26.77%) x (Access Measurement Period EBITA)

Access Measurement Period EBITA = The lesser of (i) Access' earnings before
interest, income taxes, and amortization (determined in accordance with
generally accepted accounting principles) for the twelve-month period ending on
the date of termination of Veres' employment with PentaStar or (ii) Access'
earnings before interest, income taxes, and amortization (determined in
accordance with generally accepted accounting principles) for the twelve-month
period ending on date of the Valuation Event. In any case, if the Valuation
Event occurs before termination of Veres' employment, the Access Measurement
Period EBITA shall be the twelve-month period ending on the Valuation Date. For
these purposes, Access' earnings will include earnings of Access (and its
subsidiaries, if any) before and after the acquisition of Access by PentaStar,
and, if Access is merged into PentaStar, Access earnings shall include those
earnings of PentaStar attributable to the metropolitan area in which Access
operated prior to such merger.

Total Escrowed Shares = the total number of shares of PentaStar common stock
received by Principal Shareholders prior to the date of the Valuation Event,
which Shares are placed in the Escrow Account under escrow agreements similar to
this Agreement.

Principal Shareholders = those owners of a business (including Access) acquired
by PentaStar (whether through a stock or other equity interest acquisition, a
merger, an asset acquisition or otherwise) prior to the date of the Valuation
Event who are active in the operation of such business both before and after
such acquisition, and who enter into an

<PAGE>   7

agreement, the terms and conditions of which are substantially similar to this
Agreement.

Total Operating Partner EBITA = the total Adjusted EBITA of all Principal
Shareholders (including Veres), where the Adjusted EBITA for each such Principal
Shareholder is calculated in the same manner as the Veres Adjusted EBITA is
calculated, as described above.

                                    EXAMPLES

EXAMPLE 1: Assume that all of the outstanding stock of PentaStar is sold on
December 31, 2003. Assume further that Access EBITA for 2003 = $3 million, and
that total Operating Partner EBITA (as defined above) for 2003 is $10 million.
Also, assume that 1 million total shares of PentaStar common stock (including
the Shares) are placed in the Escrow Account by all Principal Shareholders. The
Veres Adjusted EBITA = 26.77% X $3 million, which equals $803,100. The Veres
Percentage = $803,100 over $10 million, which = 8.03%. The number of Adjusted
Shares for Veres = 1 million (the total number of Shares placed in escrow) X
0.0803 (the Veres Percentage), which = 80,310. Consequently, Veres will receive
the Shares back from the Escrow Account, plus 12,045 additional shares of
PentaStar common stock directly from PentaStar.

EXAMPLE 2: Assume that all of the outstanding stock of PentaStar is sold on
December 31, 2003. Assume further that Access EBITA for 2003 = $1 million, and
that total Operating Partner EBITA (as defined above) for 2003 is $10 million.
Also, assume that 1 million total shares of PentaStar common stock (including
the Shares) are placed in the Escrow Account by all Principal Shareholders. The
Veres Adjusted EBITA = 26.77% X $1 million, which equals $267,700. The Veres
Percentage = $267,700 over $10 million, which = 2.68%. The number of Adjusted
Shares for Veres = 1 million (the total number of Shares placed in escrow) X
0.0268 (the Veres Percentage), which = 26,770. Consequently, Veres will receive
26,770 of the Shares back, and the remaining 41,495 Shares will be retained by
PentaStar.<PAGE>   1
                                                                    EXHIBIT 10.7

                              AMENDED AND RESTATED
                         PRINCIPAL STOCKHOLDER'S ESCROW
                         AND CONTINGENT STOCK AGREEMENT

         This Amended and Restated Principal Stockholder's Escrow and Contingent
Stock Agreement (this "Agreement") is entered into effective as of October 26,
1999, regardless of its date of execution, among PentaStar Communications, Inc.,
a Delaware corporation ("PentaStar" or the "Escrow Agent"), OC Mergerco 2, Inc.,
a Delaware corporation (the "Acquiror"), and Dennis Schillinger ("Schillinger"),
who is the principal stockholder of ICM Communications Integration, Inc., a
Washington corporation ("ICM") (collectively, the "Parties").

                                    RECITALS

1.       The Parties are party to a Principal Stockholder's Escrow and
         Contingent Stock Agreement dated October 26, 1999 (the "Original
         Agreement"). The parties are entering into this Agreement for the
         purpose of amending and restating the Original Agreement in its
         entirety effective as of October 26, 1999.

2.       PentaStar, the Acquiror, Schillinger and ICM are parties to an
         agreement and plan of merger dated August 13, 1999, under which ICM
         will be merged into the Acquiror in a transaction intended to qualify
         as a tax-free reorganization under Section 368(a)(1)(A) of the Internal
         Revenue Code of 1986, as amended (the "Merger Transaction").

3.       In the Merger Transaction, Schillinger will receive 120,000 shares of
         PentaStar common stock and $200,000 of cash in return for his shares of
         ICM.

4.       At the time of the Merger Transaction, the value of ICM cannot be
         determined with certainty.

5.       The purpose of this Agreement is to provide for certain adjustments in
         the amount of stock consideration Schillinger will receive in the
         Merger Transaction.

         NOW, THEREFORE, the parties to this Agreement agree as follows:

                              ARTICLE 1: DIRECTIONS

1.1      ESCROWED PROPERTY:

         Schillinger will deposit with the Escrow Agent 40,000 shares of
         PentaStar common stock (the "Shares"), which will be held by the Escrow
         Agent in a separate account the sole assets of which will consist of
         the Shares and certain shares of PentaStar common stock issued in
         connection with the acquisition by PentaStar of certain other
         businesses (the "Escrow Account"). The certificates for the Shares
         shall be delivered with appropriate stock powers duly executed in
         blank.

1.2      INSTRUCTIONS:

         The Escrow Agent shall hold and disburse the Shares pursuant to the
         instructions set forth in Schedule A, attached hereto and incorporated
         herein by reference.

<PAGE>   2

1.3      ASSIGNMENT OF INTEREST:

         The assignment, transfer, conveyance, or hypothecation of any right,
         title, or interest in and to the subject matter of this Agreement by
         any party is prohibited, and no such assignment, transfer, conveyance,
         or hypothecation will be given effect.

                 ARTICLE 2: RIGHTS OF SCHILLINGER IN THE SHARES

         During the term of this Agreement, (i) the Shares shall be reflected as
issued and outstanding on PentaStar's financial statements and other books and
records; (ii) Schillinger shall have all ownership rights with respect to the
Shares, including rights to vote such Shares and rights to any dividends paid by
PentaStar with respect to the Shares, and the books and records of PentaStar
will reflect such ownership. Upon the death or termination of employment of
Schillinger, the Shares will remain in the Escrow Account subject to
disbursement to Schillinger or his legal heirs in accordance with Schedule A.

                  ARTICLE 3: PROVISIONS CONCERNING ESCROW AGENT

3.1      ESCHEAT:

         The parties are aware that under Colorado law, escrowed property which
         is presumed abandoned may escheat to the State. The Escrow Agent shall
         have no liability to Schillinger, his respective heirs, legal
         representatives, and successors, should any or all of the Shares become
         escheatable or escheat by operation of law.

3.2      NON-LIABILITY:

         The Escrow Agent shall not be liable for any act or omission while
         acting in good faith and in the exercise of its own best judgment. Any
         act or omission by the Escrow Agent pursuant to the advice of its
         attorneys shall be conclusive evidence of such good faith. The Escrow
         Agent shall have the right to consult with counsel at its expense
         whenever any question arises concerning the Agreement and shall incur
         no liability for any delay reasonably required to obtain such advice of
         counsel. The Escrow Agent shall not be liable for the alteration,
         modification or elimination of any right permitted or given under the
         instructions set forth in Schedule A and/or in any document deposited
         under this Agreement pursuant to any statute of limitations or by
         reason of laches. The Escrow Agent shall have no further responsibility
         or liability whatsoever to Schillinger following a partial or complete
         distribution of the Shares pursuant to this Agreement. The Escrow Agent
         shall not incur any liability with respect to any act or omission in
         reliance upon any document, including any written notice or
         instructions provided for in this Agreement. In performing its
         obligations hereunder, the Escrow Agent shall be entitled to presume,
         without inquiry, the due execution, validity and effectiveness of all
         documents it receives, and also the truth and accuracy of any
         information contained therein. The Escrow Agent shall not be
         responsible or liable for any diminution in value of the Shares,
         whatsoever, for any reason.

                                       2

<PAGE>   3

3.3      DISAGREEMENTS:

         If any disagreement or dispute arises between the parties to this
         Agreement concerning the meaning or validity of any provision hereunder
         or concerning any other matter relating to this Agreement, the Escrow
         Agent:

         a.       Shall be under no obligation to act, except under process or
                  order of court, or until it has been adequately indemnified to
                  its full satisfaction, and shall sustain no liability for its
                  failure to act pending such process, court order or
                  indemnification; and

         b.       May, in its sole and absolute discretion, interplead the
                  Shares or that portion of Shares it then holds with the
                  District Court of the City and County of Denver, State of
                  Colorado, and name the parties in such interpleader action.
                  Upon filing the interpleader action, the Escrow Agent shall be
                  relieved of all liability as to the Shares. The parties by
                  signing this Agreement submit themselves to the jurisdiction
                  of such Court and do appoint the Clerk of such Court as their
                  agent for the service of all process in connection with such
                  proceedings. In no event shall the institution of such
                  interpleader action impair the rights of the Escrow Agent
                  described in Section 3.2 of this Article.

                     ARTICLE 4: GENERAL TERMS AND CONDITIONS

4.1      EXTENSION OF BENEFITS:

         Subject to Section 1.3, this Agreement shall be binding upon, inure to
         the benefit of, and be enforceable by, the respective heirs, legal
         representatives, successors, and assigns of all the parties and the
         Escrow Agent.

4.2      GOVERNING LAW:

         This Agreement shall be construed and enforced in accordance with the
         laws of the State of Colorado, without regard to the provisions of the
         laws of the State of Colorado or any other State regarding conflicts of
         laws.

4.3      NOTICES:

         All notices, requests, demands, and other communications required under
         this Agreement shall be in writing and shall be deemed to have been
         duly given if delivered personally or by certified mail, return receipt
         requested, and postage prepaid. If any notice is mailed, it shall be
         deemed given on the date such notice is deposited in the United States
         mail. If any notice is personally delivered, it shall be deemed given
         upon the date of such delivery. If notice is given to a party, it shall
         be mailed or delivered to the addresses set forth below the signature
         blocks. It shall be the responsibility of the parties to notify the
         Escrow Agent in writing of any name or address changes.

                                       3

<PAGE>   4

4.4      ENTIRE AGREEMENT:

         With respect to the subject matter hereof, this Agreement sets forth
         the entire agreement and understanding of the parties.

4.5      AMENDMENT:

         This Agreement may be amended, modified, superseded, rescinded, or
         canceled only by a written instrument executed by the parties.

4.6      WAIVERS:

         The failure of any party to this Agreement at any time or times to
         require performance of any provision under this Agreement shall in no
         manner affect the right at a later time to enforce the same
         performance. A waiver by any party to this Agreement of any such
         condition or breach of any term, covenant, representation, or warranty
         contained in this Agreement, in any one or more instances, shall
         neither be construed as a further or continuing waiver of any such
         condition or breach nor a waiver of any other condition or breach of
         any other term, covenant, representation, or warranty contained in this
         Agreement.

4.7      HEADINGS:

         Section headings of this Agreement have been inserted for convenience
         of reference only and shall in no way restrict or otherwise modify any
         of the terms of provisions of this Agreement.

4.8      COUNTERPARTS:

         This Agreement may be executed in one or more counterparts, each of
         which when executed shall be deemed to be an original, and such
         counterparts shall together constitute one and the same instrument.
         This Agreement may be delivered by facsimile, and facsimile signatures
         shall be treated as original signatures for all applicable purposes.

4.9      ARBITRATION.

         Any disputes arising under or in connection with this Agreement,
         including, without limitation, those involving claims for specific
         performance or other equitable relief, will be submitted to binding
         arbitration in Denver, Colorado before the Judicial Arbiter Group, but
         under the Commercial Arbitration Rules of the American Arbitration
         Association under the authority of federal and state arbitration
         statutes, and shall not be the subject of litigation in any forum. If
         the Judicial Arbiter Group is unavailable to conduct the arbitration,
         the it shall be before the American Arbitration Association. EACH
         PARTY, BY SIGNING THIS AGREEMENT, VOLUNTARILY, KNOWINGLY AND
         INTELLIGENTLY WAIVES ANY RIGHTS SUCH PARTY MAY OTHERWISE HAVE TO SEEK
         REMEDIES IN COURT OR OTHER FORUMS, INCLUDING THE RIGHT TO JURY TRIAL.
         The arbitrator shall have full authority to order specific performance
         and other equitable relief and award damages and other relief available
         under this Agreement or applicable law, but shall have no authority to
         add to, detract from, change or amend the terms of this Agreement or
         existing law. All arbitration proceedings, including settlements and
         awards, shall be confidential. The decision of the arbitrators will be
         final and binding, and judgment on the award by the arbitrators may be
         entered in any court of competent jurisdiction. THIS

                                       4

<PAGE>   5

         SUBMISSION AND AGREEMENT TO ARBITRATE WILL BE SPECIFICALLY ENFORCEABLE.
         The prevailing party or parties in any such arbitration in any action
         to enforce this Agreement will be entitled to recover, in addition to
         any other relief awarded by the arbitrator, all reasonable costs and
         expenses, including fees and expenses of arbitrators and attorneys,
         incurred in connection therewith. If each party prevails on specific
         issues in the arbitration, the arbitrator may allocate the costs
         incurred by all parties on a basis the arbitrator deems appropriate.

          IN WITNESS WHEREOF, the Parties to this Agreement have each caused
this Agreement to be duly executed on this 12 day of January, 2000, but
effective as of October 26, 1999.

PENTASTAR COMMUNICATIONS, INC.

/s/ Craig J. Zoellner                      /s/ Dennis Schillinger
-----------------------------------        ------------------------------------
By: Craig J. Zoellner                      DENNIS SCHILLINGER
Its:  Vice President

OC MERGERCO 2, INC.

/s/ Craig J. Zoellner
-----------------------------------
By: Craig J. Zoellner
Its: Vice President

                                       5

<PAGE>   6

                       SCHEDULE A TO THE ESCROW AGREEMENT

                         DISBURSEMENT OF THE SHARES AND
                POTENTIAL ISSUANCE OF ADDITIONAL PENTASTAR SHARES

1. Upon the occurrence of the earlier of (i) a sale of substantially all of the
assets or of all of the outstanding stock of PentaStar, or (ii) October 26, 2004
(the "Valuation Event"), the number of Adjusted Shares (as defined below) shall
be determined pursuant to the formula set forth below.

2. If the number of Adjusted Shares exceeds the number of Shares, (a) the Escrow
Agent shall distribute all of the Shares to Schillinger within 60 days of the
date of the Valuation Event; and (b) within such 60 day period, PentaStar shall
issue to Schillinger additional shares of PentaStar common stock equal to such
excess (the "Additional Shares"). The parties agree that a portion of the
Additional Shares shall be treated as imputed interest under Section 483 of the
Internal Revenue Code and reported as interest for all applicable tax purposes.
Notwithstanding the foregoing, in no event shall the number of Additional Shares
exceed the number of shares of PentaStar common stock issued to Schillinger at
the closing in the Merger Transaction but not deposited in the Escrow Account.

3. If the number of Shares exceeds the number of Adjusted Shares, then within 60
days of the date of the Valuation Event, (a) the Escrow Agent shall retain such
excess number of Shares and (b) the Escrow Agent shall distribute the remainder
of the Shares (which shall equal the number of Adjusted Shares) to Schillinger.

4. The number of Adjusted Shares shall be calculated under the following
formula:

   Adjusted Shares = (Total Escrowed Shares) x (Schillinger Percentage)

   Schillinger Percentage = Schillinger's Adjusted EBITA
                            ------------------------------
                             Total Operating Partner EBITA

Schillinger Adjusted EBITA = (11.19%) x (ICM Measurement Period EBITA)

ICM Measurement Period EBITA = The lesser of (i) ICM's earnings before interest,
income taxes, and amortization (determined in accordance with generally accepted
accounting principles) for the twelve-month period ending on the date of
termination of Schillinger's employment with PentaStar or (ii) ICM's earnings
before interest, income taxes, and amortization (determined in accordance with
generally accepted accounting principles) for the twelve-month period ending on
the date of the Valuation Event. In any case, if the Valuation Event occurs
before termination of Schillinger's employment, the ICM Measurement Period EBITA
shall be the twelve-month period ending on the Valuation Date. For these
purposes, ICM's earnings will include earnings of ICM (and its subsidiaries, if
any) before and after the acquisition of ICM by PentaStar, and, if ICM is merged
into PentaStar, ICM's earnings shall include those earnings of PentaStar
attributable to the metropolitan area in which ICM operated prior to such
merger.

Total Escrowed Shares = the total number of shares of PentaStar common stock
received by Principal Shareholders prior to the date of the Valuation Event,
which shares are placed in the Escrow Account under escrow agreements similar to
this Agreement.

Principal Shareholders = those owners of a business (including ICM) acquired by
PentaStar (whether through a stock or other equity interest acquisition, a
merger, an asset acquisition or otherwise) prior to the date of the Valuation
Event who are active in the operation of such business both before and after
such acquisition, and who enter into an agreement, the terms and conditions of
which are substantially similar to this Agreement.

                                       6

<PAGE>   7

Total Operating Partner EBITA = the total Adjusted EBITA of all Principal
Shareholders (including Schillinger), where the Adjusted EBITA for each such
Principal Shareholder is calculated in the same manner as the Schillinger
Adjusted EBITA is calculated, as described above.

                                    EXAMPLES

EXAMPLE 1: Assume that all of the outstanding stock of PentaStar is sold on
December 31, 2003. Assume further that ICM EBITA for 2003 = $3 million, and that
total Operating Partner EBITA (as defined above) for 2003 is $10 million. Also,
assume that 2 million total shares of PentaStar common stock (including the
Shares) are placed in the Escrow Account by all Principal Shareholders. The
Schillinger Adjusted EBITA = 11.19% X $3 million, which equals $335,700. The
Schillinger Percentage = $335,700 over $10 million, which = 3.36%. The number of
Adjusted Shares for Schillinger = 2 million (the total number of Shares placed
in escrow) X 0.0336 (the Schillinger Percentage), which =67,200. Consequently,
Schillinger will receive the Shares back from the Escrow Account, plus 27,200
additional shares of PentaStar common stock directly from PentaStar.

EXAMPLE 2: Assume that all of the outstanding stock of PentaStar is sold on
December 31, 2003. Assume further that ICM EBITA for 2003 = $1 million, and that
total Operating Partner EBITA (as defined above) for 2003 is $10 million. Also,
assume that 2 million total shares of PentaStar common stock (including the
Shares) are placed in the Escrow Account by all Principal Shareholders. The
Schillinger Adjusted EBITA = 11.19% X $1 million, which equals $111,900. The
Schillinger Percentage = $111,900 over $10 million, which = 1.12%. The number of
Adjusted Shares for Schillinger = 2 million (the total number of Shares placed
in escrow) X 0.0112 (the Schillinger Percentage), which = 22,400. Consequently,
Schillinger will receive 22,400 of the Shares back, and the remaining 17,600
Shares will be retained by PentaStar.

                                       7

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