Document:

<PAGE>   1
                                                                   EXHIBIT 10.23

                                    AGREEMENT

         This Agreement dated as of March 27, 2001 (this "Agreement"), is by and
between J. Ward Hunt ("Mr. Hunt"), Lynn S. Hunt, The Ward Hunt Trust for Lynn
Hunt (the "Trust"), AVIDYN Holdings, Inc., a Delaware corporation (the
"Company") and AVIDYN, Inc., a Delaware corporation ("AVIDYN").

         WHEREAS, the Company recently sold its TPA and PPO subsidiaries and Mr.
Hunt was instrumental in such transactions; and

         WHEREAS, on or about October 2, 1994, AVIDYN loaned Mr. Hunt $300,000
pursuant to the terms of a promissory note (the "Note"), which was later
transferred to the Company; and

         WHEREAS, on or about June 27, 1994, AVIDYN entered into a Deferred
Compensation Agreement (the "Deferred Compensation Agreement") with Mr. Hunt and
AVIDYN began paying and the Company currently pays the insurance premiums for a
split dollar life insurance policy with am initial face amount of $1,500,000
(the "Policy") to fund such deferred compensation;

         WHEREAS, on or about June 27, 1994, AVIDYN entered into an Amended and
Restated Collateral Assignment Split-Dollar Life Insurance Agreement with the
Trust ("Collateral Agreement");

         NOW, THEREFORE, in consideration of the premises and the mutual
promises and covenants herein contained and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the
parties agree as follows:

         1. Bonus. The Company hereby grants Mr. Hunt a bonus in the amount of
$900,000.00 subject to all applicable or appropriate withholdings and payable
March 30, 2001, subject to the obligations set forth herein and as consideration
of the releases set forth herein.

         2. Note. Mr. Hunt hereby agrees to pay the Company $486,136.55 on March
30, 2001, in payment in full of the Note and all accrued interest.

         3. Deferred Compensation Agreement. The Trust hereby elects to pay any
and all remaining premiums on the Policy. Mr. Hunt hereby agrees to pay the
Company, on behalf of the Trust, $150,000, which the parties have agreed will
reimburse the Company and AVIDYN in full for all premiums paid on the Policy.
Mr. Hunt agrees to make such payment on March 30, 2001. Conditioned upon the
payment of the $150,000, the Deferred Compensation Agreement and the Collateral
Agreement (including, without limitation, the Trust's obligation to reimburse
AVIDYN or the Company for any or all premiums) are hereby terminated in all
respects and all parties' obligations under the Deferred Compensation Agreement
and the Collateral Agreement are hereby terminated.

<PAGE>   2

         4. Full Release by All Parties. Each party hereto, on behalf of
herself, himself or itself and her, his and its agents, assigns,
attorneys-in-fact, and beneficiaries, does hereby release, discharge, and
covenant not to sue or file any charges or claims against the other parties
hereto, and her his or its directors, officers, agents, employees, accountants,
attorneys, parent corporations, affiliated corporations, or predecessor
corporations (the "Released Parties"), under any local, state, or federal law,
common or statutory, for any type of claim, demand, or action whatsoever,
whether seeking legal or equitable relief including without limitation any
claim, demand or action, in any way arising out of or associated with the
Deferred Compensation Agreement, any deferred compensation benefit, the
Collateral Agreement and all matters related to such matters (collectively, the
"Released Matters"). The parties hereto further agree that they or it will not
encourage any other person to file any type of claim against the Released
Parties, or any one of them, under any local, state, or federal law, common or
statutory, for any type of claim, demand, or action whatsoever, whether seeking
legal or equitable relief, in connection with the Released Matters.

         5. Entire Agreement. This Agreement sets forth the entire agreement
between the parties and fully supersedes any and all earlier agreements or
understandings between the parties pertaining to the subject matter of this
Agreement.

         6. Enforcement of Agreement. In the event that legal action is ever
necessary to enforce any provision of this Agreement, the prevailing party shall
be entitled to payment of its attorneys' fees and court costs incurred in
instituting and sustaining legal action.

         7. Representations. By signing below, the parties certify and represent
that they have carefully read and considered this Agreement, consulted with
their attorneys, and fully understand the extent and impact of its provisions,
and have executed this Agreement voluntarily and without coercion, undue
influence, threats, or intimidations of any kind or type whatsoever and that no
other promises have been made for the purposes of signing this Agreement.

         8. Modification. No change or modification of this Agreement shall be
valid or binding upon the parties hereto, nor shall any waiver of any term or
condition in the future be so binding, unless such change or modification or
waiver shall be in writing and signed by the parties hereto.

         9. Governing Law; Venue. This Agreement shall be governed by, and
construed in accordance with, the laws of the State of Texas, without regard to
its conflict of law principles. If any action is brought to enforce or interpret
this Agreement, venue for such action shall be in Dallas County, Texas.

         10. Counterparts. This Agreement may be executed in counterparts, each
of which shall constitute an original, but all of which shall constitute one
document.

                                       2
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         11. Assignment. No party may assign this Agreement without the express
written consent of the other parties hereto.

         12. Binding Effect. This Agreement shall be binding upon the parties
hereto, together with their respective executors, administrators, successors,
personal representatives, heirs and assigns.

         IN WITNESS WHEREOF, the undersigned have executed this Agreement to be
effective as of the date first above written.

                                        AVIDYN, Inc.

                                        By: /s/ Joseph A. Henley
                                            --------------------------------
                                            Joseph A. Hensley, President

                                        AVIDYN Holdings, Inc.

                                        By: /s/ Joseph A. Henley
                                            --------------------------------
                                            Joseph A. Hensley, President

                                            /s/ J. Ward Hunt
                                            --------------------------------
                                            J. Ward Hunt

                                            /s/ Lynn S. Hunt
                                            --------------------------------
                                            Lynn S. Hunt
                                            Spouse of J. Ward Hunt

                                            The Ward Hunt Trust for Lynn Hunt

                                            By: /s/ Lynn S. Hunt
                                                ----------------------------
                                                Lynn Hunt, Co-trustee

                                            By: /s/ Hilre Lucille Hunt
                                                ----------------------------
                                                Hilre Lucille Hunt, Co-trustee

                                       3<PAGE>   1
                                                                   EXHIBIT 10.18
                                October 17, 2000

<TABLE>
<S>                                     <C>
BACE Investments, LLC                   Robert S. Lazzeri
1522 Blake Street                       1660 Wynkoop
Denver, CO  80202                       Suite 1010
                                        Denver, CO  80202

Black Diamond Capital, LLC
4730 Table Mesa Drive
Suite H320
Boulder, CO  80301
</TABLE>

Gentlemen:

                  This letter agreement sets forth the agreement among PentaStar
Communications, Inc. ("PentaStar"), BACE Investments, LLC ("BACE"), Black
Diamond Capital, LLC ("Black Diamond") and Robert S. Lazzeri ("Lazzeri") (BACE,
Black Diamond and Lazzeri are also collectively referred to as the "Founding
Shareholders" and individually referred to as a "Founding Shareholder")
concerning the 1,674,800 shares of PentaStar's common stock ("Common Stock")
owned by BACE, the 732,419 shares of Common Stock owned by Black Diamond and the
469,499 shares of Common Stock owned by Lazzeri (such 2,876,718 total shares of
Common Stock owned by BACE, Black Diamond and Lazzeri are hereinafter referred
to as the "Shares").

                  1. In order to further the mutual interests of the Founding
Shareholders and PentaStar, each Founding Shareholder hereby agrees with
PentaStar and the other Founding Shareholders as follows:

                           (a) Except as otherwise provided in this paragraph 1,
                  each Founding Shareholder agrees that such Founding
                  Shareholder will not sell any of the Shares (which shall
                  expressly include (i) any stock dividends issued by PentaStar
                  and attributable to the Shares during the term set forth in
                  this paragraph 1, and (ii) any shares of capital stock of
                  PentaStar issued or issuable as a result of stock splits) of
                  such Founding Shareholder for the period ending at 5:00 p.m.,
                  Denver, Colorado time on October 26, 2001. Moreover, PentaStar
                  shall not recognize any attempted sale of any of the Shares
                  during the period ending at 5:00 p.m., Denver, Colorado time
                  on October 26, 2001 which does not comply with this paragraph
                  1;

                           (b) Provided that the Shares of such Founding
                  Shareholder remain subject to the terms of this paragraph 1
                  following any sale authorized in this clause (b), a Founding
                  Shareholder may sell Shares of such Founding Shareholder

<PAGE>   2

BACE Investments, LLC
Black Diamond Capital, LLC
Robert S. Lazzeri
October 17, 2000
Page -2-

                  to any Founding Shareholder, provided that the recipient of
                  such Shares agrees in writing (in form and substance
                  reasonably satisfactory to PentaStar) to be bound by the
                  provisions of this paragraph 1 with respect to such Shares and
                  such writing is delivered to PentaStar prior to such transfer;
                  and

                           (c) Any Shares may also be sold at anytime pursuant
                  to a transaction (including, without limitation, a tender
                  offer, offer to merge or acquisition of PentaStar's equity
                  securities) involving an unaffiliated purchaser or acquiror
                  effected pursuant to a vote in favor of such transaction (i)
                  by a majority of the shareholders of PentaStar, if approval of
                  the transaction by shareholders of PentaStar is required by
                  applicable law, or (ii) by a majority of the members of the
                  Board of Directors of PentaStar, if approval of the
                  transaction by shareholders of PentaStar is not required by
                  applicable law.

                  2. This letter agreement can only be amended or terminated by
a writing executed by the Founding Shareholders and by PentaStar, after receipt
by PentaStar of approval of such amendment or termination by a majority of the
members of the Board of Directors of PentaStar who are not Founding Shareholders
or owners of Founding Shareholders.

                  If this letter agreement sets forth your agreement, please so
indicate by executing a copy and returning it to PentaStar.

                                        Very truly yours,

                                        PENTASTAR COMMUNICATIONS, INC.

                                        By:/s/ Robert S. Lazzeri
                                           -------------------------------------
                                               Robert S. Lazzeri
                                               Chief Executive Officer

<PAGE>   3

BACE Investments, LLC
Black Diamond Capital, LLC
Robert S. Lazzeri
October 17, 2000
Page -3-

            Agreed and accepted this __17th____ day of October, 2000.

                                        BACE INVESTMENTS, LLC

                                        By: /s/ Craig J. Zoellner
                                            ------------------------------------
                                                Craig J. Zoellner, Member

                                        By: /s/ Richard M. Tyler
                                            ------------------------------------
                                                Richard M. Tyler, Member

                                        BLACK DIAMOND CAPITAL, LLC

                                        By: /s/ Blair W. McNea
                                            ------------------------------------
                                                Blair W. McNea, Managing Member

                                        /s/ Robert S. Lazzeri
                                        ----------------------------------------
                                            Robert S. Lazzeri

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