ARCH COMMUNICATIONS GROUP INC /DE/
DEF 14A, 2000-04-27
RADIOTELEPHONE COMMUNICATIONS
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<PAGE>   1

                            SCHEDULE 14A INFORMATION

          PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES
                  EXCHANGE ACT OF 1934 (AMENDMENT NO.       )

FILED BY THE REGISTRANT [X]       FILED BY A PARTY OTHER THAN THE REGISTRANT [ ]

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

Check the appropriate box:
[ ] Preliminary Proxy Statement
[X] Definitive Proxy Statement
[ ] Definitive Additional Materials
[ ] Soliciting Material Pursuant to sec.240.14a-11(c) or sec.240.14a-12
[ ] Confidential, for Use of the Commission Only (as permitted by Rule
    14a-6(e)(2))

                        ARCH COMMUNICATIONS GROUP, INC.
                (Name of Registrant as Specified In Its Charter)

                        ARCH COMMUNICATIONS GROUP, INC.
                   (Name of Person(s) Filing Proxy Statement)

PAYMENT OF FILING FEE (CHECK THE APPROPRIATE BOX):
[X] No fee required.
[ ] Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

   1) Title of each class of securities to which transaction applies:

   2) Aggregate number of securities to which transaction applies:

   3) Per unit price or other underlying value of transaction computed pursuant
      to Exchange Act Rule 0-11 (Set forth the amount on which the filing fee is
      calculated and state how it was determined):

   4) Proposed maximum aggregate value of transaction:

   5) Total fee paid:

[ ] Fee paid previously with preliminary materials.

[ ] Check box if any part of the fee is offset as provided by Exchange Act Rule
    0-11(a)(2) and identify the filing for which the offsetting fee was paid
    previously. Identify the previous filing by registration statement number,
    or the Form or Schedule and the date of its filing.

   1) Amount Previously Paid:

   2) Form, Schedule or Registration Statement No.:

   3) Filing Party:

   4) Date Filed:

- --------------------------------------------------------------------------------
<PAGE>   2

                        ARCH COMMUNICATIONS GROUP, INC.

                 NOTICE OF 2000 ANNUAL MEETING OF STOCKHOLDERS
                            TO BE HELD MAY 16, 2000

     NOTICE IS HEREBY GIVEN that the 2000 annual meeting of stockholders of Arch
Communications Group, Inc., a Delaware corporation, will be held on Tuesday, May
16, 2000, at 11:00 a.m. (local time) at Hale and Dorr LLP, 31st Floor, 60 State
Street, Boston, Massachusetts 02109, for the purpose of considering and voting
upon the following matters:

        1.  To elect three directors of Arch.

        2.  To approve amendments to Arch's Non-Employee Directors' Stock Option
            Plan increasing the number of shares of common stock issuable under
            such plan from 46,733 to 196,733.

        3.  To approve Arch's 2000 Stock Incentive Plan, as described in the
            accompanying proxy statement.

        4.  To ratify the selection by the board of directors of Arthur Andersen
            LLP as the independent public accountants for Arch for the fiscal
            year ending December 31, 2000.

        5.  To transact such other business as may properly come before the
            meeting.

     The board of directors has no knowledge of any other business to be
transacted at the meeting or at any adjournments thereof.

     The board of directors has fixed the close of business on Friday, April 7,
2000 as the record date for the determination of stockholders entitled to notice
of and to vote at the meeting and at any adjournments thereof. The list of
Arch's stockholders entitled to vote at the meeting will be available for
examination by any stockholder, for any purpose germane to the meeting, during
ordinary business hours for ten days prior to the meeting at the principal
executive offices of the company, 1800 West Park Drive, Suite 250, Westborough,
Massachusetts 01581, and at the place of the meeting.

     A copy of Arch's annual report to stockholders for the year ended December
31, 1999, which contains consolidated financial statements and other information
of interest to stockholders, accompanies this notice of meeting and the enclosed
proxy statement.

                                          By order of the Board of Directors,

                                          PATRICIA A. GRAY, Secretary

April 28, 2000
Westborough, Massachusetts

WHETHER OR NOT YOU PLAN TO ATTEND THE MEETING, PLEASE PROMPTLY COMPLETE, DATE,
SIGN AND RETURN THE ENCLOSED PROXY IN THE ACCOMPANYING ENVELOPE. NO POSTAGE NEED
BE AFFIXED IF THE PROXY IS MAILED IN THE UNITED STATES.
<PAGE>   3

                        ARCH COMMUNICATIONS GROUP, INC.
                        1800 WEST PARK DRIVE, SUITE 250
                        WESTBOROUGH, MASSACHUSETTS 01581

                                PROXY STATEMENT

                      2000 ANNUAL MEETING OF STOCKHOLDERS
                            TO BE HELD MAY 16, 2000

     THIS PROXY STATEMENT IS FURNISHED IN CONNECTION WITH THE SOLICITATION OF
PROXIES BY ARCH'S BOARD OF DIRECTORS FOR USE AT THE 2000 ANNUAL MEETING OF
STOCKHOLDERS TO BE HELD ON TUESDAY, MAY 16, 2000, AT 11:00 A.M. (LOCAL TIME) AT
HALE AND DORR LLP, 31ST FLOOR, 60 STATE STREET, BOSTON, MASSACHUSETTS 02109, AND
AT ANY ADJOURNMENTS THEREOF .

     All proxies will be voted in accordance with the instructions of the
stockholder. If no choice is specified, the proxies will be voted in favor of
the matters set forth in the accompanying notice of meeting. Any proxy may be
revoked by a stockholder at any time before its exercise by delivery of a
written revocation to the secretary of Arch. Attendance at the meeting will not
itself be deemed to revoke a proxy unless the stockholder affirmatively revokes
the proxy.

     On April 7, 2000, the record date for determination of stockholders
entitled to notice of and to vote at the meeting, there were issued and
outstanding and entitled to vote 60,837,603 shares of common stock, $.01 par
value per share, 2,712,185 shares of Class B common stock and 250,000 shares of
Series C convertible preferred stock, $.01 par value per share. Each share of
common stock entitles the record holder thereof to one vote, each share of Class
B common stock entitles the record holder thereof to 1/100th of a vote (on
matters other than the election of directors) and each share of Series C
preferred stock entitles the record holder thereof to 7.0176 votes, at the
meeting.

     THE NOTICE OF MEETING, THIS PROXY STATEMENT, THE ENCLOSED PROXY AND ARCH'S
ANNUAL REPORT TO STOCKHOLDERS FOR THE YEAR ENDED DECEMBER 31, 1999 ARE BEING
MAILED TO STOCKHOLDERS ON OR ABOUT APRIL 28, 2000. ARCH WILL, UPON WRITTEN
REQUEST OF ANY STOCKHOLDER, FURNISH WITHOUT CHARGE A COPY OF ITS ANNUAL REPORT
ON FORM 10-K FOR THE YEAR ENDED DECEMBER 31, 1999, AS FILED WITH THE SECURITIES
AND EXCHANGE COMMISSION, WITHOUT EXHIBITS. PLEASE ADDRESS ALL SUCH REQUESTS TO
ARCH, 1800 WEST PARK DRIVE, SUITE 250, WESTBOROUGH, MASSACHUSETTS 01581,
ATTENTION: INVESTOR RELATIONS. EXHIBITS WILL BE PROVIDED UPON WRITTEN REQUEST
AND PAYMENT OF AN APPROPRIATE PROCESSING FEE.
<PAGE>   4

SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

     The following table sets forth certain information with respect to the
beneficial ownership of shares of common stock as of April 7, 2000 by (i) each
person known by Arch to own beneficially more than 5% of the outstanding shares
of common stock, (ii) each current director of Arch, (iii) Arch's chief
executive officer and the other executive officers listed in the Summary
Compensation Table below and (iv) all current directors and executive officers
of Arch as a group.

     Because Class B common stock is not entitled to vote in the election of
directors and is entitled to only 1/100th of a vote on other matters, the voting
power of its holders is less than their percentages of beneficial ownership
shown in the table. Thus, the Class B stockholders identified in notes (2) and
(3) to the table would be entitled to cast a maximum of 17.0% of the votes in
the election of directors, assuming that they -- and only they -- exercised
outstanding options and warrants. This contrasts with the 20.2% of beneficial
ownership which is obtained by adding their individual beneficial ownership
percentages in the table.

<TABLE>
<CAPTION>
                                                         SHARES UNDERLYING
                                                            OPTIONS AND
                                           SHARES            WARRANTS            TOTAL
                                       OUTSTANDING AT    EXERCISABLE PRIOR    BENEFICIALLY
NAME                                   APRIL 7, 2000      TO JUNE 6, 2000        OWNED        PERCENTAGE
- ----                                   --------------    -----------------    ------------    ----------
<S>                                    <C>               <C>                  <C>             <C>
Sandler Capital Management(1)........     1,724,019          2,722,110          4,446,129         6.5%
W.R. Huff Asset Management Co.,
  L.L.C.(2)..........................     8,345,429            568,002          8,913,431        13.5%
Whippoorwill Associates, Inc.(3).....     3,939,048            439,904          4,378,952         6.7%
Funds affiliated with Resurgence
  Asset Management(4)................     9,350,596                 --          9,350,596        14.3%
Paul Tudor Jones(5)..................     4,136,799            126,176          4,262,975         6.5%
Citigroup Inc.(6)....................     6,097,031                 --          6,097,031         9.3%
Bay Harbour Management, L.C.(7)......     4,405,201                 --          4,405,201         6.7%
State of Wisconsin Investment
  Board(8)...........................       602,776          3,125,556          3,728,332         5.4%
C. Edward Baker, Jr. ................        37,434            181,035            218,469           *
Lyndon R. Daniels....................         4,000             46,250             50,250           *
John B. Saynor.......................        64,642            123,827            188,469           *
J. Roy Pottle........................            --             26,834             26,834           *
Paul H. Kuzia........................         1,320             27,813             29,133           *
R. Schorr Berman(9)..................       655,671          1,140,198          1,795,869         2.7%
James S. Hughes......................        40,196             76,392            116,588           *
John Kornreich(10)...................     1,804,898          2,860,989          4,665,887         6.8%
Allan L. Rayfield....................           334              3,576              3,910           *
John A. Shane(11)....................         6,856             17,769             24,625           *
Edwin M. Banks(12)...................     8,345,429            569,002          8,914,431        13.5%
H. Sean Mathis.......................            --              1,000              1,000           *
All current directors and executive
  officers as a group (12 persons)...    10,960,780          5,074,685         16,035,465        22.8%
</TABLE>

- ---------------
  *  Less than 0.5%

 (1) Sandler has sole voting and investment power over 104,000 of such shares
     and 171,116 of the shares issuable upon exercise of warrants and shared
     voting and investment power over the remaining shares and warrants.

                                        2
<PAGE>   5

 (2) Consists of 7,138,217 shares and 568,002 shares issuable upon exercise of
     warrants W.R. Huff manages on behalf of various discretionary accounts and
     1,207,212 shares held by The Huff Alternative Income Fund, L.P., an
     affiliate of W.R. Huff. W.R. Huff disclaims beneficial ownership of these
     shares.

 (3) All of such shares are owned by various limited partnerships, a limited
     liability company, a trust and third party accounts for which Whippoorwill
     Associates, Inc. has discretionary authority and acts as general partner or
     investment manager. This information is based on Amendment No. 2 to
     Schedule 13D filed by Whippoorwill Associates, Inc. on February 29, 2000
     and the Form 4 filed by Whippoorwill Associates, Inc. on March 10, 2000
     with the Securities and Exchange Commission.

 (4) Includes 3,431,350 shares beneficially owned by various funds for which
     Resurgence Asset Management, L.L.C. acts as investment manager and/or
     general partner, 2,203,795 shares beneficially owned by various funds for
     which Resurgence Asset Management International L.L.C. acts as investment
     manager and/or general partner, 3,093,097 shares beneficially owned by
     various funds for which Re/Enterprise Asset Management, L.L.C. acts as
     investment manager and/or general partner, 45,959 shares held by Kingstreet
     Ltd., 119,835 shares held by Resurgence Parallel Fund, Inc., 35,560 shares
     held by M.D. Sass Associates, Inc. Employees Profit Sharing Plan, 127,601
     shares held by James B. Rubin, 154,972 shares held by Devonshire Capital
     Partners, L.L.C., 127,041 shares held by J.B. Rubin & Company Profit
     Sharing Plan, 4,810 shares held by Guadalupe G. Rubin IRA, 5,813 shares
     held by James B. Rubin, IRA and 763 shares held by Resurgence Asset
     Management L.L.C. Employee Retirement Plan. Resurgence Asset Management,
     L.L.C., Resurgence Asset Management International L.L.C. and Re/Enterprise
     Asset Management, L.L.C., may be deemed to beneficially own the shares held
     by the funds for which each acts as investment manager and/or general
     partner and each disclaims beneficial ownership of such shares. James B.
     Rubin serves as chief investment officer and is responsible for the day-to
     day investment activities of each of Resurgence Asset Management, L.L.C.,
     Resurgence Asset Management International, L.L.C. and Re/Enterprise Asset
     Management, L.L.C. This information is based on Amendment No. 1 to Schedule
     13G filed by the funds affiliated with Resurgence Asset Management with the
     Securities and Exchange Commission on February 15, 2000.

 (5) Includes 960,139 shares and 33,417 shares issuable upon exercise of
     warrants held by Tudor BVI Futures, Ltd., 2,745,589 shares and 76,397
     shares issuable upon exercise of warrants held by The Raptor Global
     Portfolio Ltd., 10,650 shares held by The Alter Rock Fund, L.P., 204,346
     shares and 8,181 shares issuable upon exercise of warrants held by The
     Upper Mill Capital Appreciation Fund Ltd. and 216,075 shares and 8,181
     shares issuable upon exercise of warrants held by Tudor Proprietary
     Trading, L.L.C. Tudor Investment Corporation may be deemed to beneficially
     own the shares held by Tudor BVI Futures, Ltd., The Raptor Global Portfolio
     Ltd., The Alter Rock Fund, Ltd. and The Upper Mill Capital Appreciation
     Fund Ltd. because Tudor Investment Corporation is the sole general partner
     of The Alter Rock Fund L.P. and provides investment advisory services to
     The Raptor Global Portfolio Ltd., Tudor BVI Futures, Ltd. and The Upper
     Mill Capital Appreciation Fund Ltd. Mr. Jones may be deemed to beneficially
     own the shares held by Tudor Investment Corporation and Tudor Proprietary
     Trading, L.L.C. because he is the indirect controlling equity holder of
     Tudor Proprietary Trading, L.L.C. and the controlling stockholder of Tudor
     Investment Corporation. This information is based on Amendment No. 1 to
     Schedule 13G filed by Paul Tudor Jones, II and Tudor Investment Corporation
     with the Securities and Exchange Commission on February 14, 2000.

 (6) Includes 3,144,828 shares held by SSB Citi Fund Management LLC and
     2,891,513 held by Salomon Smith Barney Inc. Citigroup Inc. may be deemed to
     beneficially own all of these shares because Citigroup is the sole
     shareholder of Salomon Smith Barney Holdings, Inc. Salomon Smith Barney
     Holdings, Inc. is the sole shareholder of each of SSB Citi Fund Management
     LLC and Salomon Brothers Holding Company Inc. Salomon Brothers Holding
     Company Inc. is the sole shareholder of

                                        3
<PAGE>   6

     Salomon Smith Barney Inc. Citigroup Inc. and Salomon Smith Barney Holdings
     Inc. each disclaim beneficial ownership of all of these shares. This
     information is based on Amendment No. 1 to Schedule 13G filed by Citigroup
     Inc. with the Securities and Exchange Commission on February 8, 2000.

 (7) This information is based on the Schedule 13G filed by Bay Harbour
     Management, L.C. with the Securities and Exchange Commission on February
     14, 2000.

 (8) This information is based on the Schedule 13G filed by State of Wisconsin
     Investment Board with the Securities and Exchange Commission on February 9,
     2000.

 (9) Includes 649,337 shares and 1,122,334 shares issuable upon exercise of
     warrants held by Memorial Drive Trust, over which Mr. Berman may be deemed
     to share voting and investment power as administrator and chief executive
     officer of Memorial Drive Trust. Mr. Berman disclaims beneficial ownership
     of such shares held by Memorial Drive Trust. This information is based on
     the Schedule 13G filed by Memorial Drive Trust with the Securities and
     Exchange Commission on February 14, 2000.

(10) Includes 1,694,686 shares and 2,722,110 shares issuable upon exercise of
     warrants beneficially owned by Sandler Capital Management, over which Mr.
     Kornreich may be deemed to have voting and investment power as managing
     director, and 63,334 shares beneficially owned by two limited partnerships,
     over which Mr. Kornreich may be deemed to have voting and investment power
     as a general partner. Mr. Kornreich disclaims beneficial ownership of all
     such shares.

(11) Includes 351 shares and 606 shares issuable upon exercise of warrants owned
     by Palmer Service Corporation, over which Mr. Shane may be deemed to have
     voting and investment power as president and sole stockholder of Palmer
     Service Corporation, 159 shares issuable upon conversion of $8,000
     principal amount of Arch's 6 3/4% convertible subordinated debentures due
     2003 held by Palmer Service Corporation, and 418 shares issuable upon
     conversion of Arch's 6 3/4% convertible subordinated debentures held by Mr.
     Shane.

(12) Includes 7,138,217 shares and 568,002 shares issuable upon exercise of
     warrants W.R. Huff manages on behalf of various discretionary accounts and
     1,207,212 shares held by The Huff Alternative Income Fund, L.P., an
     affiliate of W.R. Huff. Mr. Banks is a portfolio manager of W.R. Huff. Mr.
     Banks disclaims beneficial ownership of all such shares.

Each person or entity listed in the table has an address c/o Arch except for:

     - Sandler Capital Management, 767 Fifth Avenue, 45th Floor, New York, New
       York 10153

     - W.R. Huff Asset Management Co., L.L.C. 67 Park Place, Ninth Floor,
       Morristown, NJ 07960

     - Paul Tudor Jones II, c/o Tudor Investment Corporation, 600 Steamboat
       Road, Greenwich, CT 06830

     - Whippoorwill Associates, Inc. 11 Martine Avenue, White Plains, New York
       10606

     - Resurgence Asset Management L.L.C., 10 New King Street, 1st Floor, White
       Plains, New York 10604

     - Citigroup Inc., 153 East 53(rd) Street, New York, New York 10043

     - State of Wisconsin Investment Board, P.O. Box 7842, Madison, Wisconsin
       53707

     - Bay Harbour Management, L.C., 777 South Harbour Island Boulevard, Suite
       270, Tampa, Florida 33602

                                        4
<PAGE>   7

VOTES REQUIRED

     The holders of a majority of the shares of common stock, Class B common
stock and Series C preferred stock (assuming the conversion of the Series C
preferred stock into common stock), voting together as a single class, (as so
calculated, the "voting stock") issued and outstanding and entitled to vote at
the meeting shall constitute a quorum for the transaction of business at the
meeting. Shares of common stock, Class B common stock and Series C preferred
stock present in person or represented by proxy (including shares which abstain
or do not vote with respect to one or more of the matters presented at the
meeting) will be counted for purposes of determining whether a quorum exists at
the meeting.

     The affirmative vote of the holders of a plurality of the shares of voting
stock voting on the matter is required for the election of directors (Proposal
1). The affirmative vote of the holders of a majority of the shares of voting
stock present or represented by proxy and voting on the matter is required for
the approval of the amendments to Arch's Non-Employee Directors' Stock Option
Plan (Proposal 2), the approval of the 2000 Stock Incentive Plan (Proposal 3)
and the ratification of Arthur Andersen LLP as Arch's independent public
accountants for the year ending December 31, 2000 (Proposal 4).

     Shares of voting stock which abstain from voting as to a particular matter,
and shares of voting stock held in "street name" by brokers or nominees who
indicate on their proxies that they do not have discretionary authority to vote
such shares as to a particular matter ("broker non-votes"), will not be counted
as shares voted in favor of such matter and will not be counted as shares voting
on such matter. Accordingly, abstentions and "broker non-votes" will have no
effect on the voting on a matter that requires the affirmative vote of a certain
percentage of the shares voting on a matter.

                                        5
<PAGE>   8

                      PROPOSAL 1 -- ELECTION OF DIRECTORS

     Arch's board of directors is divided into three classes. The term of each
class of directors is three years and the terms of the three classes are
staggered in such a manner that only one class is elected each year. At each
annual meeting of stockholders, directors are elected for a term of three years
to succeed those whose terms are expiring. This year's nominees are to be
elected to serve until the sooner of the 2003 annual meeting of stockholders or
until their respective successors are elected and qualified.

     The persons named in the enclosed proxy will vote to elect as directors
John B. Saynor, John A. Shane and H. Sean Mathis, the nominees named below,
unless the proxy is marked otherwise. Messrs. Saynor, Shane and Mathis are
currently directors of the company. Messrs. Saynor, Shane and Mathis have
indicated their willingness to serve if elected; however, if Messrs. Saynor,
Shane and/or Mathis should be unable to serve, the proxies may be voted for
substitute nominees selected by the board of directors or for a reduction in the
number of directors, as determined by the board of directors.

     Set forth below are the names of the current directors of Arch and the
nominees for election at the meeting, their ages, the year in which each first
became a director of the company, their principal occupations and employment
during the past five years and the names of other public companies of which they
are a director as of April 7, 2000. Also set forth below are the names of the
other current executive officers of Arch, their ages and their principal
occupations and employment during the past five years.

<TABLE>
<CAPTION>
                                                            POSITIONS WITH COMPANY,
                                                           PRINCIPAL OCCUPATIONS AND
            NAME AND PERIOD OF                             EMPLOYMENT OVER PAST FIVE
          SERVICE AS A DIRECTOR             AGE             YEARS, AND DIRECTORSHIPS
          ---------------------             ---    ------------------------------------------
<S>                                         <C>    <C>
                             NOMINEES WHOSE TERMS EXPIRE IN 2003
John B. Saynor............................  59     Executive Vice President of Arch since
Director since 1986                                1990; President and Chief Executive
                                                   Officer of Arch from 1986 to March 1988;
                                                   Chairman of the Board of Arch from 1986
                                                   until May 1989.
John A. Shane(1)..........................  67     President of Palmer Service Corporation, a
Director since 1988                                venture capital firm, since 1972; director
                                                   of the following public companies and
                                                   registered investment companies: Gensym
                                                   Corporation, Overland Data, Inc., and
                                                   United Asset Management Corporation
</TABLE>

                                        6
<PAGE>   9

<TABLE>
<CAPTION>
                                                            POSITIONS WITH COMPANY,
                                                           PRINCIPAL OCCUPATIONS AND
            NAME AND PERIOD OF                             EMPLOYMENT OVER PAST FIVE
          SERVICE AS A DIRECTOR             AGE             YEARS, AND DIRECTORSHIPS
          ---------------------             ---    ------------------------------------------
<S>                                         <C>    <C>
H. Sean Mathis(1).........................  53     President of Litchfield Asset Holdings, an
Director since 1999                                investment advisory company, since 1999;
                                                   Chairman of the Board of Allis Chalmers,
                                                   Inc., January 1996 to 1999; from July 1996
                                                   to September 1997, Chairman of the Board
                                                   of Universal Gym Equipment Inc., a
                                                   privately owned company which filed for
                                                   protection under the Bankruptcy Code in
                                                   July 1997; from 1991 to 1995, President of
                                                   RCL Capital Corporation, which was merged
                                                   into DISC Graphics in November 1995;
                                                   director of Kasper A.S.L. Ltd. and
                                                   Thousand Trails, Inc.
                            DIRECTORS WHOSE TERMS EXPIRE IN 2002
James S. Hughes(1)........................  57     President and Chief Executive Officer of
Director since 1986                                Norwich Corporation, a real estate
                                                   investment and service firm, since 1987.
Allan L. Rayfield(2)......................  64     Consultant since 1995; director of Parker
Director since 1997                                Hannifin Corporation and Acme Metals
                                                   Incorporated.
Edwin M. Banks(2).........................  37     Employed by W.R. Huff Asset Management
Director since 1999                                Co., L.L.C. since 1988 and currently
                                                   serves as a portfolio manager; director of
                                                   e/spire Communications, Inc.
                            DIRECTORS WHOSE TERMS EXPIRE IN 2001
C. Edward Baker, Jr.......................  49     Chief Executive Officer of Arch since 1988
Director since 1988                                and Chairman of the Board since May 1989;
                                                   from 1988 until January 1998, President of
                                                   Arch.
R. Schorr Berman(2).......................  51     President and Chief Executive Officer of
Director since 1986                                MDT Advisers, Inc., an investment adviser,
                                                   since 1987; director of Mercury Computer
                                                   Systems, Inc.
John Kornreich............................  54     Managing Director of Sandler Capital
Director since 1998                                Management Co., Inc. since 1988.
</TABLE>

                                        7
<PAGE>   10

<TABLE>
<CAPTION>
                                                            POSITIONS WITH COMPANY,
                                                           PRINCIPAL OCCUPATIONS AND
                                                           EMPLOYMENT OVER PAST FIVE
                   NAME                     AGE             YEARS, AND DIRECTORSHIPS
                   ----                     ---    ------------------------------------------
<S>                                         <C>    <C>
                              OTHER EXECUTIVE OFFICERS OF ARCH
Lyndon R. Daniels.........................  47     President and Chief Operating Officer of
                                                   Arch since January 1998; President and
                                                   Chief Executive Officer of Pacific Bell
                                                   Mobile Services, a subsidiary of SBC
                                                   Communications Inc., from November 1993 to
                                                   January 1998.
J. Roy Pottle.............................  41     Executive Vice President and Chief
                                                   Financial Officer of Arch since February
                                                   1998; Vice President and Treasurer of
                                                   Jones Intercable, Inc., a cable television
                                                   operator, from October 1994 to February
                                                   1998.
Paul H. Kuzia.............................  57     Executive Vice President, Technology and
                                                   Regulatory Affairs of Arch since September
                                                   1996; Vice President, Engineering and
                                                   Regulatory Affairs of Arch from 1988 to
                                                   September 1996; prior to 1988, director of
                                                   operations at Message Center Inc.
</TABLE>

- ---------------
(1) Member of the Audit Committee.

(2) Member of the Executive Compensation and Stock Option Committee.

     For information regarding beneficial ownership of Arch's common stock,
Class B common stock and by each current director, see "Security Ownership of
Certain Beneficial Owners and Management".

BOARD AND COMMITTEE MEETINGS

     During the year ended December 31, 1999 the board of directors held 20
meetings, including regular, special and telephonic meetings.

     In order to facilitate the various functions of the board of directors, the
board has created an audit committee and an executive compensation and stock
option committee (the "compensation committee"). There is no standing nominating
committee of the board.

     Messrs. Shane (Chairman), Hughes and Mathis currently serve on the audit
committee. (Mr. Berman served on the audit committee until his resignation
therefrom on August 12, 1999. Mr. Mathis has served on the audit committee since
August 12, 1999). The audit committee reviews the annual financial statements of
Arch prior to their submission to the board of directors and consults with
Arch's independent public accountants to review financial results, internal
financial controls and procedures, audit plans and recommendations. The audit
committee also recommends the selection, retention or termination of independent
public accountants and approves services provided by independent public
accountants prior to the provision of such services. The audit committee held
five meetings during the year ended December 31, 1999. The audit committee has
recommended that Arthur Andersen LLP be selected as the independent public
accountants for Arch for the year ending December 31, 2000. See "Proposal 4 --
Ratification of Selection of Independent Public Accountants".

                                        8
<PAGE>   11

     Messrs. Berman (Chairman), Banks and Rayfield currently serve on the
compensation committee. (Mr. Shane served on the compensation committee until
his resignation therefrom on August 12, 1999. Mr. Banks has served on the
compensation committee since August 12, 1999.)The compensation committee
recommends to the board the compensation of executive officers, key managers and
directors and administers Arch's stock plans. The compensation committee held 12
meetings during the year ended December 31, 1999.

     In 1999, all directors attended at least 75% of the total number of
meetings of the board of directors and of the committees on which they serve.

SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

     Section 16(a) of the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), requires Arch's directors, executive officers and holders of
more than 10% of Arch's common stock to file with the Securities and Exchange
Commission initial reports of ownership and reports of changes in ownership of
the common stock of Arch. Arch believes that during the year ended December 31,
1999 all officers, directors and holders of more than 10% of Arch's common stock
complied with all Section 16(a) filing requirements.

DIRECTOR COMPENSATION

  FEES AND EXPENSES

     Arch pays its non-employee ("outside") directors an annual fee of $5,000,
an additional annual fee of $1,000 for serving as chairs of board committees,
$2,000 for each meeting of the board of directors attended and $750 for each
board committee meeting attended. Arch also reimburses all directors for
customary and reasonable expenses incurred in attending board and board
committee meetings.

     Under a deferred compensation plan for Arch's outside directors, each
outside director has the right to make an election to defer his compensation as
an outside director ("director compensation") and to receive the deferred
amounts in cash on a specific calendar date or a date on which a certain event
occurs, such as the date he ceases to be an outside director (the "distribution
date"). All deferred compensation is credited, as of the date on which such
compensation would have been paid, at the participant's election in either cash
or shares of Arch common stock based on the market price of such shares as of
the date such compensation would have been paid. On the distribution date, any
deferred compensation credited in shares of common stock is converted into cash
by valuing each stock unit at the market price of a share of common stock on the
distribution date. Mr. Rayfield and Mr. Banks are the only outside directors who
have elected to participate in this plan. Mr. Rayfield elected to defer all of
his 1999 director compensation, of which 50% will be credited in cash and 50%
will be credited in shares of common stock of Arch, until the date he ceases to
be a director of the company. Mr. Banks elected to defer all of his 1999
director compensation of which 100% will be credited in shares of Arch common
stock, until the date he ceases to be a director of the company.

OUTSIDE DIRECTORS' STOCK OPTION PLANS

     Non-Employee Directors' Stock Option Plan.  Currently, a total of 46,733
shares of common stock may be issued upon the exercise of options granted under
Arch's Non-Employee Directors' Stock Option Plan (the "outside directors' option
plan"). Only directors of Arch who are not employees of the company are eligible
to receive options under the outside directors' option plan. Options granted
under the outside directors' option plan do not qualify as incentive stock
options under Section 422 of the Internal Revenue Code of 1986, as amended (the
"Code"). Under the outside directors' option plan, outside directors receive
annual grants (on the annual meeting date of each year) of options to purchase
3,000

                                        9
<PAGE>   12

shares of common stock. In addition, newly elected or appointed outside
directors receive options to purchase 3,000 shares of common stock as of the
date of their initial appointment or election. All options have an exercise
price equal to the fair market value of the common stock on the date of grant.

     Currently, each option under the outside directors' option plan becomes
exercisable with respect to 100% of the shares subject to the option on the date
of grant, subject to Arch's repurchase option which would allow Arch to
repurchase, at its option up to 75% of the total number of shares subject to
such option on the date of grant less 25% on each of the first three
anniversaries of the date of grant. In general, an optionee may exercise his or
her option only while he or she is a director of Arch and for 90 days after he
or she ceases to be a director of the company (one year if due to death or
permanent and total disability). In addition, options expire immediately if a
director is terminated for "cause". Unexercised options expire ten years after
the date of grant. Options are not transferable or assignable other than upon
the death of the optionee or pursuant to a qualified domestic relations order
(as defined in the Code).

     An optionee's options become fully vested upon his or her death and all
options become fully vested in the event of a change in control of Arch (as
defined in the outside directors' option plan, which includes a merger in which
the stockholders prior to the merger own less than 80% of the voting power of
the combined entity). Pursuant to the terms of the outside directors' option
plan, all options outstanding on May 16, 1995, covering a total of 2,406 shares
of common stock exercisable at $37.41 per share and none of which was held by
Arch's current directors, became fully exercisable and vested as a result of the
company's purchase of approximately 37% of USA Mobile Communications Holdings,
Inc.'s ("USA Mobile") then outstanding capital stock in the first step of the
company's acquisition of USA Mobile.

     Under the outside directors' option plan, Messrs. Berman, Hughes and Shane
have each received (i) an option to purchase 1,000 shares of common stock at an
exercise price of $82.68 per share upon the completion of Arch's acquisition of
USA Mobile on September 7, 1995, (ii) an option to purchase 1,000 shares of
common stock at an exercise price of $70.50 per share on December 26, 1995,
(iii) an option to purchase 1,000 shares of common stock at an exercise price of
$23.625 per share on December 24, 1996, (iv) an option to purchase 1,000 shares
of common stock at an exercise price of $13.6875 per share on December 24, 1997,
(v) an option to purchase 1,000 shares of common stock at an exercise price of
$4.3125 per share on December 24, 1998 and (vi) an option to purchase 1,000
shares of common stock at an exercise price of $6.0939 per share on May 18,
1999. Mr. Rayfield received, under the outside directors' option plan, (i) an
option to purchase 1,000 shares of common stock at an exercise price of $23.625
per share upon his election to the board of directors on July 28, 1997, (ii) an
option to purchase 1,000 shares of common stock at an exercise price of $13.6875
per share on December 24, 1997, (iii) an option to purchase 1,000 shares of
common stock at an exercise price of $4.3125 per share on December 24, 1998 and
(iv) an option to purchase 1,000 shares of common stock at an exercise price of
$6.0939 per share on May 18, 1999. Mr. Kornreich received, under the outside
directors' option plan, (i) an option to purchase 1,000 shares of common stock
at an exercise price of $12.375 upon his election to the board of directors on
June 29, 1998, (ii) an option to purchase 1,000 shares of common stock at an
exercise price of $4.3125 per share on December 24, 1998 and (iii) an option to
purchase 1,000 shares of common stock at an exercise price of $6.0939 per share
on May 18, 1999. Messrs. Banks and Mathis each received, under the outside
directors' option plan, an option to purchase 1,000 shares of common stock at an
exercise price of $7.8282 per share upon his election to the board of directors
on June 3, 1999. As of April 7, 2000, options to purchase an aggregate of 27,000
shares of common stock were outstanding and 2,406 options had been exercised
under the outside directors' option plan. For information relating to proposed
amendments to the outside directors' option plan, see "Proposal 2 -- Approval of
Amendment to the Company's Non-Employee Directors' Stock Option Plan".

                                       10
<PAGE>   13

     1995 Outside Directors' Stock Option Plan.  Under Arch's 1995 Outside
Directors' Stock Option Plan (the "1995 directors' plan"), Messrs. Berman,
Hughes and Shane each received an option to purchase 1,667 shares of common
stock at an exercise price equal to the fair market value of the common stock on
January 30, 1995 ($55.50 per share). Each option under the 1995 directors' plan
becomes exercisable at the rate of 20% of the shares subject to the option on
the first anniversary of the date of grant and 5% of the shares subject to the
option per calendar quarter thereafter. In the event of a change in control of
Arch (as defined therein), all outstanding options will become fully exercisable
and vested. In general, an optionee may exercise his option, to the extent
vested, only while he is a director of Arch and for one year after he ceases to
be a director of Arch. Unexercised options expire ten years after the date of
grant. Options are not transferable or assignable other than upon the death of
the optionee or pursuant to a qualified domestic relations order (as defined in
the Code). The 1995 directors' plan was terminated on September 7, 1995, but
outstanding options continue to vest on the same terms as in effect prior
thereto. As of April 7, 2000, options to purchase an aggregate of 5,001 shares
of common stock were outstanding and no options had been exercised under the
1995 directors' plan.

EXECUTIVE COMPENSATION

  SUMMARY COMPENSATION TABLE

     The following table sets forth certain information with respect to the
annual and long-term compensation of Arch's chief executive officer and certain
other executive officers (the "named executive officers") for the years ended
December 31, 1997, 1998 and 1999:

                           SUMMARY COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                                                         LONG-TERM
                                                                                        COMPENSATION
                                                                                        ------------
                                                     ANNUAL COMPENSATION                 OPTIONS TO
                                         --------------------------------------------     PURCHASE
                                                                         OTHER ANNUAL     COMPANY
                                                                         COMPENSATION   COMMON STOCK
NAME AND PRINCIPAL POSITION DURING 1999  YEAR   SALARY $   BONUS($)(1)      ($)(2)         (#)(3)
- ---------------------------------------  ----   --------   -----------   ------------   ------------
<S>                                      <C>    <C>        <C>           <C>            <C>
C. Edward Baker, Jr. .................   1999   $434,337    $185,000       $  4,163       150,000
  Chairman and Chief                     1998    373,742     135,000            600       151,554(4)
  Executive Officer                      1997    353,317     227,500            600        16,545
Lyndon R. Daniels.....................   1999    313,735     203,000         23,363(5)     91,667
  President and Chief Operating          1998    295,416          --        113,905(5)     46,666
  Officer (joined Arch in January 1998)
J. Roy Pottle.........................   1999    228,896     140,000          2,317        66,666
  Executive Vice President and           1998    179,200          --         99,304(5)     30,000
  Chief Financial Officer (joined
  Arch in February 1998)
John B. Saynor........................   1999    161,667      44,092          1,490        20,000
  Executive Vice President               1998    157,646      41,770            600        17,247(6)
                                         1997    153,188      72,900            600         5,302
Paul H. Kuzia.........................   1999    190,163      64,480          3,373        41,666
  Executive Vice President/              1998    165,489      58,435            600        29,616(7)
  Technology and Regulatory Affairs      1997    157,633      77,400            600         5,629
</TABLE>

- ---------------
(1) Represents bonus paid in such fiscal year with respect to prior year.

(2) Represents Arch's matching contributions paid under Arch's 401(k) plan.

                                       11
<PAGE>   14

(3) No restricted stock awards or stock appreciation rights (SARs) were granted
    to any of the named executive officers during the years ended December 31,
    1997, 1998 or 1999.

(4) Includes options to purchase 136,563 shares granted as part of the January
    16, 1998 option repricing program.

(5) Represents reimbursement for certain relocation costs and associated taxes.

(6) Includes options to purchase 11,968 shares granted as part of the January
    16, 1998 option repricing program.

(7) Includes options to purchase 23,229 shares granted as part of the January
    16, 1998 option repricing program.

  EXECUTIVE RETENTION AGREEMENTS

     Arch is a party to executive retention agreements for a total of seventeen
executives, including Messrs. Baker, Daniels, Kuzia, Pottle and Saynor.

     The purpose of the executive retention agreements is to assure the
continued employment and dedication of the executives without distraction from
the possibility of a change in control (as defined in the executive retention
agreements) of Arch. In the event of a change in control, and the termination of
the executive's employment at any time within the 12-month period thereafter by
Arch (other than for cause, disability or death) or by the executive for good
reason (as defined in the executive retention agreements), the executive shall
be eligible to receive (i) a cash severance payment equal to the executive's
base salary plus any other amounts earned through the date of termination (to
the extent not previously paid), (ii) an additional lump sum cash payment equal
to a specified multiple (the "multiple") of the sum of (a) the executive's
annual base salary in effect at the time of the change in control and (b) the
average bonus paid for the three calendar years immediately preceding the
calendar year during which the change in control occurs, and (iii) any amounts
or benefits required to be paid or provided to the executive or which the
executive is eligible to receive following the executive's termination under any
plan, program, policy, practice, contract or agreement of Arch. In addition,
until the earlier of (a) 12 months after termination or (b) the executive
becomes reemployed with another employer and is eligible to receive
substantially equivalent benefits, Arch shall arrange to provide the executive
with life, disability, accident and health insurance benefits similar to those
previously maintained. The multiple for Messrs. Baker, Daniels, Pottle, Saynor
and Kuzia is three, and the multiple for the other executives is one or two.
Good reason is defined to include, among other things, a material reduction in
employment responsibilities, compensation or benefits or, in the case of Mr.
Baker, the failure to become the chief executive of any entity succeeding or
controlling Arch. Each of these executive retention agreements also provides
that all options held by the executive shall become immediately exercisable in
full upon a change in control. Change in control is defined to include the
acquisition of 50% or more of the outstanding voting securities of Arch by any
entity or group, a change in a majority of the board of directors of Arch and a
sale of all or substantially all the assets of the company or a merger involving
the company where the stockholders prior to such merger hold less than a
majority of the voting power of the combined entity following such merger. The
board of directors approved amendments to these agreements that provide that the
proposed acquisition of PageNet, if consummated, would not constitute a change
in control for purposes of option acceleration and that a change in control in a
merger involving the company would only occur if it resulted in the stockholders
prior to such merger holding less than a majority of the voting power of the
combined entity and the directors of the company ceasing to constitute a
majority of the directors of the combined entity.

                                       12
<PAGE>   15

  STOCK OPTION GRANTS

     The following table summarizes certain information regarding options to
purchase shares of common stock granted to the named executive officers during
the year ended December 31, 1999. No SARs were granted during the year ended
December 31, 1999.

                       OPTION GRANTS IN LAST FISCAL YEAR

<TABLE>
<CAPTION>
                                    INDIVIDUAL GRANTS                               POTENTIAL REALIZABLE
                       --------------------------------------------                   VALUE AT ASSUMED
                         NUMBER OF      PERCENT OF                                  ANNUAL RATES OF STOCK
                        SECURITIES     TOTAL OPTIONS                               PRICE APPRECIATION FOR
                        UNDERLYING      GRANTED TO     EXERCISE OR                     OPTIONS TERM(3)
                          OPTIONS      EMPLOYEES IN     BASE PRICE    EXPIRATION   -----------------------
        NAME           GRANTED(#)(1)    FISCAL YEAR    ($/SHARE)(2)      DATE        5%($)       10%($)
        ----           -------------   -------------   ------------   ----------   ---------   -----------
<S>                    <C>             <C>             <C>            <C>          <C>         <C>
C. Edward Baker......     150,000          11.64%        $7.8282       06/03/09    $738,467    $1,871,420
Lyndon R. Daniels....      91,667           7.11          7.8282       06/03/09     451,287     1,143,650
J. Roy Pottle........      66,666           5.17          7.8282       06/03/09     328,204       831,734
John B. Saynor.......      20,000           1.55          7.8282       06/03/09      98,462       249,523
Paul H. Kuzia........      41,666           3.23          7.8282       06/03/09     205,126       519,831
</TABLE>

- ---------------
(1) Options generally become exercisable at a rate of 20% of the shares subject
    to the option on each of the first five anniversaries of the date of grant.

(2) The exercise price is equal to the fair market value of the common stock on
    the date of grant.

(3) Amounts represent hypothetical gains that could be achieved for the options
    if exercised at the end of the option terms. These gains are based on
    assumed rates of stock appreciation of 5% and 10% compounded annually from
    the date the respective options were granted and are not intended to
    forecast future appreciation of the price of the common stock. The named
    executive officers will realize gain upon the exercise of these options only
    if an increase in the price of the common stock which benefits all Arch
    stockholders proportionately.

                                       13
<PAGE>   16

  OPTION EXERCISES AND YEAR-END OPTION TABLE

     The following table sets forth certain information regarding the exercise
of options to purchase shares of common stock during the year ended December 31,
1999 and such options held as of December 31, 1999 by the named executive
officers.

                AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR
                       AND FISCAL YEAR-END OPTION VALUES

<TABLE>
<CAPTION>
                                                                                            VALUE OF UNEXERCISED
                            SHARES                       NUMBER OF SECURITIES             IN-THE-MONEY OPTIONS AT
                          ACQUIRED ON    VALUE          UNDERLYING UNEXERCISED                FISCAL YEAR-END
                           EXERCISE     REALIZED      OPTIONS AT FISCAL YEAR-END       (EXERCISABLE)/(UNEXERCISABLE)
NAME                          (#)        ($)(1)    (EXERCISABLE)/(UNEXERCISABLE)(#)                ($)(2)
- ----                      -----------   --------   ---------------------------------   ------------------------------
<S>                       <C>           <C>        <C>            <C>                  <C>            <C>
C. Edward Baker, Jr.....                               72,959          228,595                --              --
Lyndon R. Daniels.......      --          --           16,335          121,998                --              --
J. Roy Pottle...........      --          --           10,500           86,166                --              --
John B. Saynor..........      --          --            6,706           30,541                --              --
Paul H. Kuzia...........      --          --           14,371           56,911                --              --
</TABLE>

- ---------------
(1) Represents the difference between the exercise price and the fair market
    value of the common stock on the date of exercise.

(2) Based on the fair market value of the common stock on December 31, 1999
    ($6.5938 per share) less the option exercise price.

  ACCELERATION OF CERTAIN STOCK OPTIONS

     Arch's 1989 Stock Option Plan, as amended (the "1989 option plan"),
provides that all options granted thereunder become fully exercisable and vested
upon the occurrence of any of the following events: (i) the acquisition by any
person of 20% or more of Arch's common stock if, within 24 months thereafter, a
majority of the persons elected to Arch's board of directors is not approved by
vote of two-thirds of the directors in office at the time of the acquisition;
(ii) a merger, consolidation or sale of all or substantially all of Arch's
assets; or (iii) the adoption of a proposal to liquidate or dissolve Arch. As a
result of the completion of Arch's acquisition of USA Mobile, all options
outstanding as of September 7, 1995 under the 1989 option plan, covering a total
of 52,086 shares of common stock, became fully exercisable and vested, including
options to purchase 13,296 and 1,493 shares of common stock, respectively, then
held by Messrs. Baker and Kuzia.

     Arch's Stock Option Plan which was adopted in 1994 and amended and restated
on January 26, 1995 (the "1994 option plan") provides that all options granted
thereunder become fully exercisable and vested in the event of a change in
control of the company (as defined therein). Pursuant to the terms of the 1994
option plan, all options outstanding on May 16, 1995, covering a total of
187,935 shares of common stock, became fully exercisable and vested as a result
of Arch's purchase of approximately 37% of USA Mobile's then outstanding capital
stock in the first step of the company's acquisition of USA Mobile.

                                       14
<PAGE>   17

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

     The current members of Arch's compensation committee are Edwin M. Banks, R.
Schorr Berman and Allan L. Rayfield. Messrs. Berman and Rayfield served on the
compensation committee throughout 1999. Mr. Banks has served on the compensation
committee since August 12, 1999. Mr. Shane served on the compensation committee
until his resignation therefrom on August 12, 1999.

     C. Edward Baker, Jr., the chairman and chief executive officer of Arch,
makes recommendations and participates in discussions regarding executive
compensation, but he does not participate directly in discussions regarding his
own compensation. No current executive officer of Arch has served as a director
or member of the compensation committee (or other committee serving an
equivalent function) of any other entity, any of whose executive officers has
served as a director of Arch or as a member of the compensation committee of
Arch.

COMPENSATION COMMITTEE REPORT ON EXECUTIVE COMPENSATION

  OVERVIEW

     The compensation committee recommends to the board of directors the
compensation of executive officers, key managers and directors and administers
Arch's stock plans. Arch's executive compensation program is intended to promote
the achievement of the company's business goals and, thereby, to maximize
corporate performance and stockholder returns. Compensation consists of a
mixture of base salary, performance bonuses and stock-based incentives. The
compensation committee believes it is important to have bonuses constitute a
portion of each person's compensation package in order to tie an individual's
compensation level to individual and corporate performance, and believes it is
important to have stock incentives constitute a portion of each person's
compensation package in order to help align the interests of executives and
stockholders.

     In determining levels of compensation, the compensation committee considers
a number of factors such as: (i) competitive positioning, including compensation
of executives and managers at comparable companies; (ii) present compensation
levels; (iii) individual performance, including expected future contributions to
the company; and (iv) Arch's need to attract, retain and reward key management
personnel. The compensation committee, in determining Mr. Baker's compensation,
reviewed compensation for chief executives of publicly-held companies of similar
size, particularly those in paging and similar businesses, Mr. Baker's
individual performance against quantitative and qualitative goals and the
performance of Arch.

  BASE SALARY

     The base salary of each executive officer and key manager is reviewed
annually. In setting base salaries, the compensation committee considers the
factors described above. During the year ended December 31, 1999, the
compensation committee fixed Mr. Baker's annual base salary at $450,000.

  PERFORMANCE BONUSES

     The payment of bonuses to executive officers and key managers is directly
related to their achievement of corporate and individual performance goals and
Arch's performance in relation to an industry peer group. The amount of the
bonus paid, if any, varies among the executive officers and managers depending
on their success in achieving individual performance goals, their contribution
to the achievement of corporate performance goals and Arch's performance
compared to its peers.

                                       15
<PAGE>   18

     At the beginning of each year, Mr. Baker proposes base salary and bonus
parameters for the year to the compensation committee for consideration and
approval. This proposal incorporates corporate-wide goals as well as goals
jointly established by Mr. Baker and each of the bonus plan participants for
their individual areas of responsibility. For the year ended December 31, 1999,
the compensation committee and the board of directors approved a target bonus
ranging from 30-70% of the base salaries of all eligible bonus participants,
which included all executive officers and other key managers. The individual and
corporate goals included in the budget generally represent objective measures of
performance. These goals include quantifiable financial objectives, such as the
achievement of revenue or operating cash flow targets, and milestones in asset
management, marketing and other areas.

     Throughout the year, Mr. Baker meets with certain executive officers to
review his or her progress in achieving these goals. These executive officers
then meet with other executive officers and key managers. After the end of the
year, Mr. Baker performs a final performance review with the compensation
committee and presents proposed bonus award levels to the compensation committee
for consideration and approval. The compensation committee has approved Mr.
Baker's proposals in respect of bonuses for the year ended December 31, 1999. In
recognition of the achievement of corporate and his individual goals, the
compensation committee awarded Mr. Baker a bonus of $371,250 in March 2000.

  EQUITY-BASED COMPENSATION

     Grants of options under Arch's stock option plans are intended to relate
executive compensation to corporate performance and to help align long-term
interests of Arch's executive officers, key managers and stockholders. The
compensation committee considers options to be an important method of providing
an incentive for executive officers and key managers to remain with, and to
continue to make significant contributions to, Arch. Therefore, in granting
options the compensation committee considers the number and value of options
held by each executive officer or key manager which will vest in future periods,
in addition to the other factors described above. The compensation committee
also seeks to maintain equitable relationships among executive officers and key
managers who have similar levels of responsibility.

     During the year ended December 31, 1999, options were granted to Mr. Baker
and the other named executive officers. The exercise price of all options
granted to executive officers during the year ended December 31, 1999 was equal
to the fair market value of Arch's common stock on the date of grant. See
"Executive Compensation -- Stock Option Grants".

  EXECUTIVE RETENTION AGREEMENTS

     Arch is a party to executive retention agreements with a total of seventeen
executives, including Messrs. Baker, Daniels, Pottle, Saynor and Kuzia. The
purpose of these Agreements is to assure the continued employment and dedication
of the executives without distraction from the possibility of a change in
control (as defined in the Agreements) of the company. See "Executive
Compensation -- Executive Retention Agreements".

  COMPLIANCE WITH INTERNAL REVENUE CODE SECTION 162(m)

     Section 162(m) of the Code generally disallows a tax deduction to public
companies for compensation over $1,000,000 paid to the corporation's chief
executive officer and four other most highly compensated executive officers.
Qualifying "performance-based" compensation is not subject to the deduction
limit if certain requirements are met. Arch intends to structure the stock
options granted to its executive officers under Arch's 1989 option plan, 1997
stock option plan and 2000 Stock Incentive Plan in

                                       16
<PAGE>   19

a manner that complies with Section 162(m) of the Code so as to mitigate any
disallowance of deductions.

     The 1994 option plan (which was adopted by USA Mobile prior to its
acquisition by the company) does not contain the necessary limitations to comply
with the performance-based requirements of Section 162(m). Arch does not
currently intend to qualify any compensation granted under the 1994 Option Plan
as performance-based compensation. However, the compensation committee will
continue to monitor the impact of Section 162(m) on Arch to determine whether
such plan should be amended to conform to Section 162(m).

                                            THE EXECUTIVE COMPENSATION AND
                                            STOCK OPTION COMMITTEE

                                            R. Schorr Berman, Chairman
                                            Edwin M. Banks
                                            Allan L. Rayfield

CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

     Arch and three other entities founded an offshore corporation to pursue
wireless messaging opportunities in Latin America. Arch and Mr. Hughes each
contributed $250,000 to this offshore corporation. Arch and Mr. Hughes made
subsequent investments of $200,000 and $50,000, respectively, in the offshore
corporation during 1999. Arch and Mr. Hughes currently own 15.4% and 12.4%,
respectively, of the offshore corporation. Arch plans to maintain narrowband PCS
licenses obtained by the offshore corporation in Chile, Argentina and Peru. The
investment required to maintain these licenses is estimated at $30,000. Arch and
other shareholders of the offshore corporation, including Mr. Hughes, are
expected to make additional investments to fund the costs to maintain the
licenses.

     Arch's board of directors have approved loans from the company to C. Edward
Baker, Jr., chief executive officer and chairman of the board of Arch. The loans
bear interest at 5%-9.5% annually. As of April 7, 2000, principal and accrued
interest of $387,300 was outstanding.

                                       17
<PAGE>   20

COMPARATIVE STOCK PERFORMANCE

     The graph below compares the cumulative total stockholder return on the
Arch common stock for the period from December 31, 1994 through the year ended
December 31, 1999 with the cumulative total return on (i) the Nasdaq Stock
Market -- U.S. Index; (ii) a peer group index (the "New Peer Group Index")
comprised of Metrocall, Inc., Paging Network, Inc., and WebLink Wireless Inc.
(formerly known as Pagemart Wireless, Inc.) (the "New Peer Group"); and (iii) a
peer group index (the "Old Peer Group Index") comprised of Metrocall, Inc.,
Preferred Networks, Inc., Paging Network, Inc. and WebLink Wireless Inc. (the
"Old Peer Group"). Arch has selected the New Peer Group because it believes it
is more representative of the paging industry than the Old Peer Group. The
comparison below assumes the investment of $100 on December 31, 1994 in Arch's
common stock and in the Nasdaq Stock Market -- U.S. Index and the investment of
$100 on December 31, 1994 in the New Peer Group Index and Old Peer Group Index
and, in each case, assumes reinvestment of all dividends. Measurement points are
on December 31, 1994, December 31, 1995, December 31, 1996, December 31, 1997,
December 31, 1998 and December 31, 1999.

                 COMPARISON OF 5 YEAR CUMULATIVE TOTAL RETURN*
            AMONG ARCH COMMUNICATIONS GROUP, INC., THE NASDAQ STOCK
          MARKET (U.S.) INDEX, A NEW PEER GROUP AND AN OLD PEER GROUP

                                  [LINE GRAPH]

                                       18
<PAGE>   21

<TABLE>
<CAPTION>
                                        12/31/94   12/31/95   12/31/96   12/31/97   12/31/98   12/31/99
                                        --------   --------   --------   --------   --------   --------
<S>                                     <C>        <C>        <C>        <C>        <C>        <C>
Arch Communications Group, Inc........  $100.00    $136.17    $ 53.19    $ 29.08    $  8.16    $ 12.47
New Peer Group........................   100.00     140.61      82.82      65.42      34.80      27.96
Old Peer Group........................   100.00     140.61      82.82      63.15      33.37      26.83
Nasdaq Stock Market (U.S.)............   100.00     141.33     173.89     213.07     300.25     542.43
</TABLE>

- ---------------
* $100 invested on 12/31/94 in stock or index, including reinvestment of
  dividends. Fiscal year ending December 31.

                   PROPOSAL 2 -- APPROVAL OF AMENDMENT TO THE
              COMPANY'S NON-EMPLOYEE DIRECTORS' STOCK OPTION PLAN

     The board of directors believes that the future growth and success of Arch
depends, in large part, on its ability to attract and retain qualified
non-employee directors ("outside directors") and that stock option grants under
Arch's outside directors' option plan have provided and will continue to provide
outside directors with an important incentive to continue as directors of the
company. Accordingly, the board of directors has adopted, subject to stockholder
approval, an amendment to Arch's outside directors' option plan increasing the
number of shares of common stock available for issuance under such Plan from
46,733 to 196,733. The board of directors of Arch believes that the amendments
to the outside directors' option plan are in the best interests of the company
and its stockholders and recommends that the stockholders vote FOR this
proposal.

     The following is a summary of the outside directors' option plan.

SUMMARY OF THE PLAN

     The outside directors' option plan currently authorizes the issuance of up
to an aggregate of 46,733 shares of common stock to outside directors. If this
proposal is approved, the number of available shares will be increased to
196,733. The outside directors' option plan is administered by the compensation
committee, which is authorized to make rules and regulations for the
administration and interpretation of the outside directors' option plan.

     Under the outside directors' option plan, outside directors receive annual
grants (on the date of the annual meeting of each year) of options to purchase
3,000 shares of common stock. In addition, newly elected or appointed outside
directors receive options to purchase 3,000 shares of common stock as of the
date of their initial appointment or election. All options have an exercise
price equal to the fair market value of the common stock on the date of grant.
Fair market value, under the outside directors' option plan, is the average of
the high and low sales prices per share of common stock on the date of grant as
reported in the Wall Street Journal, or, if there was no trading on such date,
the next preceding date on which there was trading. Each option currently
becomes exercisable as to 100% of the shares on the date of grant, subject to
Arch's repurchase option which allows Arch to repurchase, at its option, up to
75% of the total number of shares subject to such option on the date of grant
less 25% on each of the first three anniversaries of the date of grant. In
general, an optionee may exercise his or her option, to the extent vested, only
while he or she is a director of Arch and for 90 days after he or she ceases to
be a director of the company (one year if due to death or permanent and total
disability). In addition, options expire immediately if a director is terminated
for "cause". Unexercised options expire ten years after the date of grant.
Options are not transferable or assignable other than upon the death of the
optionee or pursuant to a qualified domestic relations order (as defined in the
Code).

                                       19
<PAGE>   22

FEDERAL INCOME TAX CONSEQUENCES

     The following is a summary of the United States federal income tax
consequences that generally will arise with respect to options granted under the
outside directors' option plan and with respect to the sale of common stock
acquired under the outside directors' option plan.

TAX CONSEQUENCES TO PARTICIPANTS

     A participant will not recognize taxable income upon the grant of an option
under the outside directors' option plan. Nevertheless, a participant generally
will recognize ordinary compensation income upon the exercise of the option in
an amount equal to the excess of the fair market value of the common stock
acquired through the exercise of the option (the "option stock") that is not
subject to Arch's repurchase option on the exercise date over the exercise
price.

     In general, a participant who exercises an option and receives shares
subject to Arch's repurchase option ("restricted stock") and then makes an
election under Section 83(b) of the Code (a "Section 83(b) election") within 30
days of the exercise date will be taxable as described above except that Arch's
repurchase option will be treated, for tax purposes, as fully lapsed. A
participant who exercises an option and receives restricted stock and does not
make a Section 83(b) election within 30 days of the exercise date generally will
also be taxable as described above, except that, for tax purposes, the option
effectively will not be treated as having been exercised until Arch's repurchase
option lapses.

     A participant will have a tax basis for any option stock equal to the
exercise price plus any income recognized with respect to the option. Upon
selling option stock, a participant generally will recognize capital gain or
loss in an amount equal to the difference between the sale price of the option
stock and the participant's tax basis in the option stock. This capital gain or
loss will be a long-term capital gain or loss if the participant has held the
option stock for more than one year prior to the date of the sale and will be a
short-term capital gain or loss if the participant has held the option stock for
a shorter period.

TAX CONSEQUENCES TO THE COMPANY

     The grant of an option under the outside directors' option plan will have
no tax consequences to Arch. The company generally will be entitled to a
business-expense deduction, however, with respect to any ordinary compensation
income recognized by a participant under the outside directors' option plan.

              PROPOSAL 3 -- APPROVAL OF 2000 STOCK INCENTIVE PLAN

     On April 24, 2000, Arch's board of directors adopted the 2000 Stock
Incentive Plan (the "2000 plan"). Up to 6,000,000 shares of common stock
(subject to adjustment in the event of stock splits and other similar events)
may be issued pursuant to awards granted under the 2000 plan.

     The board of directors believes that the future success of Arch depends, in
large part, upon the ability of Arch to maintain a competitive position in
attracting, retaining and motivating key personnel. Approval of the 2000 plan by
stockholders will make the employees participating in the 2000 plan eligible for
the favorable tax benefits described below. ACCORDINGLY, THE BOARD OF DIRECTORS
BELIEVES ADOPTION OF THE 2000 PLAN IS IN THE BEST INTERESTS OF ARCH AND ITS
STOCKHOLDERS AND RECOMMENDS A VOTE FOR THIS PROPOSAL.

SUMMARY OF THE 2000 PLAN

     The following summary of the 2000 plan is qualified in its entirety by
reference to the 2000 plan, a copy of which is attached as Exhibit A to this
proxy statement.

                                       20
<PAGE>   23

  DESCRIPTION OF AWARDS

     The 2000 plan provides for the grant of incentive stock options intended to
qualify under Section 422 of the Code, nonstatutory stock options, restricted
stock awards and other stock-based awards, including the grant of shares based
upon certain conditions, the grant of securities convertible into common stock
and the grant of stock appreciation rights (collectively "awards").

     Incentive Stock Options and Nonstatutory Stock Options.  Optionees receive
the right to purchase a specified number of shares of common stock at a
specified option price and subject to such other terms and conditions as are
specified in connection with the option grant. Options may be granted at an
exercise price which may be less than, equal to or greater than the fair market
value of the common stock on the date of grant. Under present law, however,
incentive stock options and options intended to qualify as performance-based
compensation under Section 162(m) of the Code may not be granted at an exercise
price less than the fair market value of the common stock on the date of grant
(or less than 110% of the fair market value in the case of incentive stock
options granted to optionees holding more than 10% of the voting power of Arch,
its parent or any subsidiaries (a "10% holder")). Options may not be granted for
a term in excess of ten years (or in excess of five years in the case of
incentive stock options granted to 10% holders). The 2000 Plan permits the board
of directors to determine the manner of payment of the exercise price of
options, including through payment by cash, check or in connection with a
"cashless exercise" through a broker, by surrender to Arch of shares of common
stock, by delivery to Arch of a promissory note, or by any other lawful means.

     Restricted Stock Awards.  Restricted stock awards entitle recipients to
acquire shares of common stock, subject to the right of Arch to repurchase all
or part of such shares from the recipient in the event that the conditions
specified in the applicable award are not satisfied prior to the end of the
applicable restriction period established for such award.

     Other Stock-Based Awards.  Under the 2000 plan, the board of directors has
the right to grant other awards based upon the common stock having such terms
and conditions as the board of directors may determine, including the grant of
shares based upon certain conditions, the grant of securities convertible into
common stock and the grant of stock appreciation rights.

  ELIGIBILITY TO RECEIVE AWARDS

     Officers, employees, directors, consultants and advisors of (and any
individuals who have accepted an offer for employment with) Arch and its
subsidiaries are eligible to be granted awards under the 2000 plan. Under
present law, however, incentive stock options may only be granted to employees.
The maximum number of shares with respect to which awards may be granted to any
participant under the 2000 plan may not exceed 3,000,000 shares per calendar
year.

     As of April 24, 2000, approximately 5,000 persons were eligible to receive
awards under the 2000 plan, including Arch's five executive officers and seven
non-employee directors. The granting of awards under the 2000 plan is
discretionary, and the company cannot now determine the number or type of awards
to be granted in the future to any particular person or group.

     On April 24, 2000, the last reported sale price of Arch common stock on the
Nasdaq National Market was $6.0625.

  ADMINISTRATION

     The 2000 plan is administered by the board of directors. The board has the
authority to adopt, amend and repeal the administrative rules, guidelines and
practices relating to the 2000 plan and to interpret the
                                       21
<PAGE>   24

provisions of the 2000 plan. Pursuant to the terms of the 2000 plan, the board
of directors may delegate authority under the 2000 plan to one or more
committees or subcommittees of the board. The board has authorized the
compensation committee to administer certain aspects of the 2000 plan, including
the granting of options to executive officers. Subject to any applicable
limitations contained in the 2000 plan, the board of directors, the compensation
committee, or any other committee or subcommittee to whom the board delegates
authority, as the case may be, selects the recipients of awards and determines
(i) the number of shares of common stock covered by options and the dates upon
which such options become exercisable, (ii) the exercise price of options, (iii)
the duration of options, and (iv) the number of shares of common stock subject
to any restricted stock or other stock-based awards and the terms and conditions
of such awards, including conditions for repurchase, issue price and repurchase
price.

     The board of directors is required to make appropriate adjustments in
connection with the 2000 plan and any outstanding awards to reflect stock
dividends, stock splits and certain other events. In the event of a merger,
liquidation or other reorganization event or change in control event (each as
defined in the 2000 plan), the board of directors is authorized to provide for
outstanding options or other stock-based awards to be assumed or substituted
for, to accelerate the awards to make them fully exercisable prior to
consummation of the event or to provide for a cash out of the value of any
outstanding options. If any Award expires or is terminated, surrendered or
canceled without having been fully exercised or is forfeited in whole or in part
or results in any common stock not being issued, the unused shares of common
stock covered by such award will again be available for grant under the 2000
plan.

  AMENDMENT OR TERMINATION

     No award may be made under the 2000 plan after April 24, 2010, but Awards
previously granted may extend beyond that date. The board of directors may at
any time amend, suspend or terminate the 2000 plan, except that no award
designated as subject to Section 162(m) of the Code by the board of directors
after the date of such amendment shall become exercisable, realizable or vested
(to the extent such amendment was required to grant such award) unless and until
such amendment shall have been approved by Arch's stockholders.

FEDERAL INCOME TAX CONSEQUENCES

     The following is a summary of the United States federal income tax
consequences that generally will arise with respect to awards granted under the
2000 plan and with respect to the sale of common stock acquired under the 2000
plan.

  INCENTIVE STOCK OPTIONS

     In general, a participant will not recognize taxable income upon the grant
or exercise of an incentive stock option. Instead, a participant will recognize
taxable income with respect to an incentive stock option only upon the sale of
common stock acquired through the exercise of the option ("ISO stock"). The
exercise of an incentive stock option, however, may subject the participant to
the alternative minimum tax.

     Generally, the tax consequences of selling ISO stock will vary with the
length of time that the participant has owned the ISO stock at the time it is
sold. If the participant sells ISO stock after having owned it for at least two
years from the date the option was granted (the "grant date") and one year from
the date the option was exercised (the "exercise date"), then the participant
will recognize long-term capital gain in an amount equal to the excess of the
sale price of the ISO stock over the exercise price.

     If the participant sells ISO stock for more than the exercise price prior
to having owned it for at least two years from the grant date and one year from
the exercise date (a "disqualifying disposition"), then all
                                       22
<PAGE>   25

or a portion of the gain recognized by the participant will be ordinary
compensation income and the remaining gain, if any, will be a capital gain. This
capital gain will be a long-term capital gain if the participant has held the
ISO stock for more than one year prior to the date of sale.

     If a participant sells ISO stock for less than the exercise price, then the
participant will recognize capital loss equal to the excess of the exercise
price over the sale price of the ISO stock. This capital loss will be a
long-term capital loss if the participant has held the ISO stock for more than
one year prior to the date of sale.

  NONSTATUTORY STOCK OPTIONS

     As in the case of an incentive stock option, a participant will not
recognize taxable income upon the grant of a nonstatutory stock option. Unlike
the case of an incentive stock option, however, a participant who exercises a
nonstatutory stock option generally will recognize ordinary compensation income
in an amount equal to the excess of the fair market value of the common stock
acquired through the exercise of the option ("NSO stock") on the exercise date
over the exercise price.

     With respect to any NSO stock, a participant will have a tax basis equal to
the exercise price plus any income recognized upon the exercise of the option.
Upon selling NSO stock, a participant generally will recognize capital gain or
loss in an amount equal to the excess of the sale price of the NSO stock over
the participant's tax basis in the NSO stock. This capital gain or loss will be
a long-term gain or loss if the participant has held the NSO stock for more than
one year prior to the date of the sale.

  RESTRICTED STOCK AWARDS

     A participant will not recognize taxable income upon the grant of a
restricted stock award, unless the participant makes an election under Section
83(b) of the Code (a "Section 83(b) election"). If the participant makes a
Section 83(b) election within 30 days of the date of the grant, then the
participant will recognize ordinary income, for the year in which the award is
granted, in an amount equal to the difference between the fair market value of
the common stock at the time the Award is granted and the purchase price paid
for the common stock. If a Section 83(b) election is not made, the participant
will recognize ordinary income, at the time that the forfeiture provisions or
restrictions on transfer lapse, in an amount equal to the difference between the
fair market value of the common stock at the time of such lapse and the original
purchase price paid for the common stock. The participant will have a basis in
the common stock acquired equal to the sum of the price paid and the amount of
ordinary compensation income recognized.

     Upon the disposition of the common stock acquired pursuant to a restricted
stock award, the participant will recognize a capital gain or loss equal to the
difference between the sale price of the common stock and the participant's
basis in the common stock. The gain or loss will be a long-term gain or loss if
the shares are held for more than one year.

  OTHER STOCK-BASED AWARDS

     The tax consequences associated with any other stock-based award granted
under the 2000 plan will vary depending on the specific terms of such award.
Among the relevant factors are whether or not the award has a readily
ascertainable fair market value, whether or not the award is subject to
forfeiture provisions or restrictions on transfer, the nature of the property to
be received by the participant under the award, and the participant's holding
period and tax basis for the award or underlying common stock.

                                       23
<PAGE>   26

  TAX CONSEQUENCES TO THE COMPANY

     The grant of an award under the 2000 plan will have no tax consequences to
Arch. Moreover, in general, neither the exercise of an incentive stock option
nor the sale of any common stock acquired under the 2000 Plan will have any tax
consequences to the company. Arch generally will be entitled to a
business-expense deduction, however, with respect to any ordinary compensation
income recognized by a participant under the 2000 Plan, including in connection
with a restricted stock award or as a result of the exercise of a nonstatutory
stock option or a disqualifying disposition. Any such deduction will be subject
to the limitations of Section 162(m) of the Code.

                   PROPOSAL 4 -- RATIFICATION OF SELECTION OF
                         INDEPENDENT PUBLIC ACCOUNTANTS

     The board of directors has selected the firm of Arthur Andersen LLP as
Arch's independent public accountants for the fiscal year ending December 31,
2000. The board of directors recommends that the stockholders vote FOR
ratification of that appointment. If the stockholders do not ratify the
selection of Arthur Andersen LLP as Arch's independent public accountants, the
board of directors will reconsider the matter. Representatives of Arthur
Andersen LLP are expected to be present at the meeting and will have the
opportunity to make a statement, if desired, and will be available to respond to
appropriate questions from stockholders.

                 STOCKHOLDER PROPOSALS FOR 2001 ANNUAL MEETING

     Any proposal that a stockholder intends to present at the 2001 annual
meeting of stockholders must be submitted to the secretary of the company at its
offices, 1800 West Park Drive, Suite 250, Westborough, Massachusetts 01581, no
later than December 29, 2000 in order to be considered for inclusion in the
proxy statement relating to that meeting.

     In addition, Arch's by-laws require that Arch be given advance notice of
stockholder nominations for election to Arch's board of directors and of other
matters which stockholders wish to present for action at an annual meeting of
stockholders (other than matters included in Arch's proxy statement in
accordance with Rule 14a-8). The required notice must be made in writing and
delivered or mailed to the secretary of Arch at the principal offices of Arch,
and received not less than 80 days prior to the annual meeting of stockholders;
provided, however, that if less than 90 days' notice or prior public disclosure
of the date of the meeting is given or made to stockholders, such nomination may
be mailed or delivered to the secretary not later than the close of business on
the tenth day following the date on which the notice of the meeting was mailed
or such public disclosure was made, whichever occurs first. The 2001 annual
meeting of stockholders is currently expected to be held on May 15, 2001.
Assuming that this date does not change, in order to comply with the time
periods set forth in Arch's by-laws, appropriate notice would need to be
provided to the secretary no later than February 23, 2001.

                                 OTHER MATTERS

     The board of directors knows of no other business which will be presented
for consideration at the meeting other than that described above. However, if
any other business should come before the meeting, it is the intention of the
persons named in the enclosed proxy to vote, or otherwise act, in accordance
with their best judgment on such matters.

                                       24
<PAGE>   27

     Arch will bear the costs of soliciting proxies. In addition to solicitation
by mail, Arch's directors, officers and regular employees may, without
additional remuneration, solicit proxies by telephone, telegraph, facsimile and
personal interviews. Corporate Investor Communications, Inc. has been hired by
Arch to act as a distribution agent and solicitor only with respect to record
holders who are brokers, dealers, banks or other entities that exercise
fiduciary powers in nominee name or otherwise. For these services Arch will pay
a fee of approximately $5,000 plus expenses. Arch will also request brokerage
houses, custodians, nominees and fiduciaries to forward copies of the proxy
material to those persons for whom they hold shares and request instructions for
voting the proxies. Arch will reimburse such brokerage houses and other persons
for their reasonable expenses in connection with this distribution.

     THE BOARD OF DIRECTORS HOPES THAT STOCKHOLDERS WILL ATTEND THE MEETING.
WHETHER OR NOT YOU PLAN TO ATTEND, YOU ARE URGED TO COMPLETE, DATE, SIGN AND
RETURN THE ENCLOSED PROXY IN THE ACCOMPANYING ENVELOPE. PROMPT RESPONSE WILL
GREATLY FACILITATE ARRANGEMENTS FOR THE MEETING AND YOUR COOPERATION IS
APPRECIATED. STOCKHOLDERS WHO ATTEND THE MEETING MAY VOTE THEIR STOCK PERSONALLY
AFTER DELIVERY OF WRITTEN REVOCATION OF THEIR PROXY TO THE SECRETARY OF THE
COMPANY.

                                            By Order of the Board of Directors,

                                            PATRICIA A. GRAY, Secretary

April 28, 2000
Westborough, Massachusetts

                                       25
<PAGE>   28

                                                                       EXHIBIT A

                        ARCH COMMUNICATIONS GROUP, INC.

                           2000 STOCK INCENTIVE PLAN

1.  PURPOSE

     The purpose of this 2000 Stock Incentive Plan (the "Plan") of Arch
Communications Group, Inc., a Delaware corporation (the "Company"), is to
advance the interests of the Company's stockholders by enhancing the Company's
ability to attract, retain and motivate persons who make (or are expected to
make) important contributions to the Company by providing such persons with
equity ownership opportunities and performance-based incentives and thereby
better aligning the interests of such persons with those of the Company's
stockholders. Except where the context otherwise requires, the term "Company"
shall include any of the Company's present or future subsidiary corporations as
defined in Section 424(f) of the Internal Revenue Code of 1986, as amended, and
any regulations promulgated thereunder (the "Code") and any other business
venture (including, without limitation, joint venture or limited liability
company) in which the Company has a significant interest, as determined by the
Board of Directors of the Company (the "Board").

2.  ELIGIBILITY

     All of the Company's employees, officers, directors, consultants and
advisors (and any individuals who have accepted an offer for employment) are
eligible to be granted options, restricted stock awards, or other stock-based
awards (each, an "Award") under the Plan. Each person who has been granted an
Award under the Plan shall be deemed a "Participant".

3.  ADMINISTRATION AND DELEGATION

     (a)  Administration by Board of Directors.  The Plan will be administered
by the Board. The Board shall have authority to grant Awards and to adopt, amend
and repeal such administrative rules, guidelines and practices relating to the
Plan as it shall deem advisable. The Board may correct any defect, supply any
omission or reconcile any inconsistency in the Plan or any Award in the manner
and to the extent it shall deem expedient to carry the Plan into effect and it
shall be the sole and final judge of such expediency. All decisions by the Board
shall be made in the Board's sole discretion and shall be final and binding on
all persons having or claiming any interest in the Plan or in any Award. No
director or person acting pursuant to the authority delegated by the Board shall
be liable for any action or determination relating to or under the Plan made in
good faith.

     (b)  Appointment of Committees.  To the extent permitted by applicable law,
the Board may delegate any or all of its powers under the Plan to one or more
committees or subcommittees of the Board (a "Committee"). All references in the
Plan to the "Board" shall mean the Board or a Committee of the Board to the
extent that the Board's powers or authority under the Plan have been delegated
to such Committee.

4.  STOCK AVAILABLE FOR AWARDS

     (a)  Number of Shares.  Subject to adjustment under Section 8, Awards may
be made under the Plan for up to 6,000,000 shares of common stock, .01 par value
per share, of the Company (the "Common Stock"). If any Award expires or is
terminated, surrendered or canceled without having been fully exercised or is
forfeited in whole or in part or results in any Common Stock not being issued,
the unused

                                       A-1
<PAGE>   29

Common Stock covered by such Award shall again be available for the grant of
Awards under the Plan, subject, however, in the case of Incentive Stock Options
(as hereinafter defined), to any limitation required under the Code. Shares
issued under the Plan may consist in whole or in part of authorized but unissued
shares or treasury shares.

     (b)  Per-Participant Limit.  Subject to adjustment under Section 8, for
Awards granted after the Common Stock is registered under the Securities
Exchange Act of 1934 (the "Exchange Act"), the maximum number of shares of
Common Stock with respect to which Awards may be granted to any Participant
under the Plan shall be 3,000,000 per calendar year. The per-Participant limit
described in this Section 4(b) shall be construed and applied consistently with
Section 162(m) of the Code ("Section 162(m)").

5.  STOCK OPTIONS

     (a)  General.  The Board may grant options to purchase Common Stock (each,
an "Option") and determine the number of shares of Common Stock to be covered by
each Option, the exercise price of each Option and the conditions and
limitations applicable to the exercise of each Option, including conditions
relating to applicable federal or state securities laws, as it considers
necessary or advisable. An Option which is not intended to be an Incentive Stock
Option (as hereinafter defined) shall be designated a "Nonstatutory Stock
Option".

     (b)  Incentive Stock Options.  An Option that the Board intends to be an
"incentive stock option" as defined in Section 422 of the Code (an "Incentive
Stock Option") shall only be granted to employees of the Company and shall be
subject to and shall be construed consistently with the requirements of Section
422 of the Code. The Company shall have no liability to a Participant, or any
other party, if an Option (or any part thereof) which is intended to be an
Incentive Stock Option is not an Incentive Stock Option.

     (c)  Exercise Price.  The Board shall establish the exercise price at the
time each Option is granted and specify it in the applicable option agreement.

     (d)  Duration of Options.  Each Option shall be exercisable at such times
and subject to such terms and conditions as the Board may specify in the
applicable option agreement; provided that no option will be granted for a term
in excess of 10 years.

     (e)  Exercise of Option.  Options may be exercised by delivery to the
Company of a written notice of exercise signed by the proper person or by any
other form of notice (including electronic notice) approved by the Board
together with payment in full as specified in Section 5(f) for the number of
shares for which the Option is exercised.

     (f)  Payment Upon Exercise.  Common Stock purchased upon the exercise of an
Option granted under the Plan shall be paid for as follows:

          (1) in cash or by check, payable to the order of the Company;

          (2) except as the Board may, in its sole discretion, otherwise provide
     in an option agreement, by (i) delivery of an irrevocable and unconditional
     undertaking by a creditworthy broker to deliver promptly to the Company
     sufficient funds to pay the exercise price or (ii) delivery by the
     Participant to the Company of a copy of irrevocable and unconditional
     instructions to a creditworthy broker to deliver promptly to the Company
     cash or a check sufficient to pay the exercise price;

          (3) as long as the Common Stock is registered under the Exchange Act,
     by delivery of shares of Common Stock owned by the Participant valued at
     their fair market value as determined by (or in a
                                       A-2
<PAGE>   30

     manner approved by) the Board in good faith ("Fair Market Value"), provided
     (i) such method of payment is then permitted under applicable law and (ii)
     such Common Stock was owned by the Participant at least six months prior to
     such delivery;

          (4) to the extent permitted by the Board, in its sole discretion by
     (i) delivery of a promissory note of the Participant to the Company on
     terms determined by the Board, or (ii) payment of such other lawful
     consideration as the Board may determine; or

          (5) by any combination of the above permitted forms of payment.

     (g)  Substitute Options.  In connection with a merger or consolidation of
an entity with the Company or the acquisition by the Company of property or
stock of an entity, the Board may grant Options in substitution for any options
or other stock or stock-based awards granted by such entity or an affiliate
thereof. Substitute Options may be granted on such terms as the Board deems
appropriate in the circumstances, notwithstanding any limitations on Options
contained in the other sections of this Section 5.

6.  RESTRICTED STOCK

     (a)  Grants.  The Board may grant Awards entitling recipients to acquire
shares of Common Stock, subject to the right of the Company to repurchase all or
part of such shares at their issue price or other stated or formula price (or to
require forfeiture of such shares if issued at no cost) from the recipient in
the event that conditions specified by the Board in the applicable Award are not
satisfied prior to the end of the applicable restriction period or periods
established by the Board for such Award (each, a "Restricted Stock Award").

     (b)  Terms and Conditions.  The Board shall determine the terms and
conditions of any such Restricted Stock Award, including the conditions for
repurchase (or forfeiture) and the issue price, if any. Any stock certificates
issued in respect of a Restricted Stock Award shall be registered in the name of
the Participant and, unless otherwise determined by the Board, deposited by the
Participant, together with a stock power endorsed in blank, with the Company (or
its designee). At the expiration of the applicable restriction periods, the
Company (or such designee) shall deliver the certificates no longer subject to
such restrictions to the Participant or if the Participant has died, to the
beneficiary designated, in a manner determined by the Board, by a Participant to
receive amounts due or exercise rights of the Participant in the event of the
Participant's death (the "Designated Beneficiary"). In the absence of an
effective designation by a Participant, Designated Beneficiary shall mean the
Participant's estate.

7.  OTHER STOCK-BASED AWARDS

     The Board shall have the right to grant other Awards based upon the Common
Stock having such terms and conditions as the Board may determine, including the
grant of shares based upon certain conditions, the grant of securities
convertible into Common Stock and the grant of stock appreciation rights.

8.  ADJUSTMENTS FOR CHANGES IN COMMON STOCK AND CERTAIN OTHER EVENTS

     (a)  Changes in Capitalization.  In the event of any stock split, reverse
stock split, stock dividend, recapitalization, combination of shares,
reclassification of shares, spin-off or other similar change in capitalization
or event, or any distribution to holders of Common Stock other than a normal
cash dividend, (i) the number and class of securities available under this Plan,
(ii) the per-Participant limit set forth in Section 4(b), (iii) the number and
class of securities and exercise price per share subject to each outstanding
Option, (iv) the repurchase price per share subject to each outstanding
Restricted Stock

                                       A-3
<PAGE>   31

Award, and (v) the terms of each other outstanding Award shall be appropriately
adjusted by the Company (or substituted Awards may be made, if applicable) to
the extent the Board shall determine, in good faith, that such an adjustment (or
substitution) is necessary and appropriate. If this Section 8(a) applies and
Section 8(c) also applies to any event, Section 8(c) shall be applicable to such
event, and this Section 8(a) shall not be applicable.

     (b)  Liquidation or Dissolution.  In the event of a proposed liquidation or
dissolution of the Company, the Board shall upon written notice to the
Participants provide that all then unexercised Options will (i) become
exercisable in full as of a specified time at least 10 business days prior to
the effective date of such liquidation or dissolution and (ii) terminate
effective upon such liquidation or dissolution, except to the extent exercised
before such effective date. The Board may specify the effect of a liquidation or
dissolution on any Restricted Stock Award or other Award granted under the Plan
at the time of the grant of such Award.

     (c)  Reorganization and Change in Control Events

          (1)  Definitions

             (a) A "Reorganization Event" shall mean:

                (i) any merger or consolidation of the Company with or into
           another entity as a result of which the Common Stock is converted
           into or exchanged for the right to receive cash, securities or other
           property; or

                (ii) any exchange of shares of the Company for cash, securities
           or other property pursuant to a share exchange transaction.

             (b) A "Change in Control Event" shall mean an event involving
        either (i) or (ii), but shall not include the event in (iii):

                (i) the acquisition by an individual, entity or group (within
           the meaning of Section 13(d)(3) or 14(d)(2) of the Securities
           Exchange Act of 1934, as amended (the "Exchange Act")) (a "Person")
           of beneficial ownership of any capital stock of the Company if, after
           such acquisition, such Person beneficially owns (within the meaning
           of Rule 13d-3 promulgated under the Exchange Act) 50% or more of
           either (x) the then-outstanding shares of common stock of the Company
           (the "Outstanding Company Common Stock") or (y) the combined voting
           power of the then-outstanding securities of the Company entitled to
           vote generally in the election of directors (the "Outstanding Company
           Voting Securities"); provided, however, that for purposes of this
           subsection (i), the following acquisitions shall not constitute a
           Change in Control Event: (A) any acquisition directly from the
           Company (excluding an acquisition pursuant to the exercise,
           conversion or exchange of any security exercisable for, convertible
           into or exchangeable for common stock or voting securities of the
           Company, unless the Person exercising, converting or exchanging such
           security acquired such security directly from the Company or an
           underwriter or agent of the Company), (B) any acquisition by any
           employee benefit plan (or related trust) sponsored or maintained by
           the Company or any corporation controlled by the Company or any
           Acquiring Corporation (as defined in subsection (ii) of this
           definition), or (C) any acquisition by any corporation pursuant to a
           Business Combination (as defined below) which fails to satisfy the
           condition specified in clause (y) of subsection (ii) of this
           definition; or

                (ii) the consummation of a merger, consolidation,
           reorganization, recapitalization or share exchange involving the
           Company or a sale or other disposition of all or substantially all

                                       A-4
<PAGE>   32

           of the assets of the Company (a "Business Combination"), if,
           immediately following such Business Combination, neither of the
           following two conditions is satisfied: (x) all or substantially all
           of the individuals and entities who were the beneficial owners of the
           Outstanding Company Common Stock and Outstanding Company Voting
           Securities immediately prior to such Business Combination
           beneficially own, directly or indirectly, more than 50% of the
           then-outstanding shares of common stock and the combined voting power
           of the then-outstanding securities entitled to vote generally in the
           election of directors, respectively, of the resulting or acquiring
           corporation in such Business Combination (which shall include,
           without limitation, a corporation which as a result of such
           transaction owns the Company or substantially all of the Company's
           assets either directly or through one or more subsidiaries) (such
           resulting or acquiring corporation is referred to herein as the
           "Acquiring Corporation") in substantially the same proportions as
           their ownership of the Outstanding Company Common Stock and
           Outstanding Company Voting Securities, respectively, immediately
           prior to such Business Combination and (y) the Continuing Directors
           (as defined below) do not constitute a majority of the Board (or, if
           applicable, the Board of Directors of a successor corporation to the
           Company), where the term "Continuing Director" means at any date a
           member of the Board (A) who was a member of the Board on the date of
           the initial adoption of this Plan by the Board or (B) who was
           nominated or elected subsequent to such date by at least a majority
           of the directors who were Continuing Directors at the time of such
           nomination or election or whose election to the Board was recommended
           or endorsed by at least a majority of the directors who were
           Continuing Directors at the time of such nomination or election;
           provided, however, that there shall be excluded from this clause (B)
           any individual whose initial assumption of office occurred as a
           result of an actual or threatened election contest with respect to
           the election or removal of directors or other actual or threatened
           solicitation of proxies or consents, by or on behalf of a person
           other than the Board; but

                (iii) Notwithstanding the foregoing, no transaction undertaken
           in connection with or contemplated by the Agreement and Plan of
           Merger dated as of November 7, 1999 among Paging Network, Inc., Arch
           Communications Group, Inc. and St. Louis Acquisition Corp., as
           amended from time to time, shall be a Change of Control for purposes
           of this Plan.

          (2)  Effect on Options

             (a)  Reorganization Event.  Upon the occurrence of a Reorganization
        Event (regardless of whether such event also constitutes a Change in
        Control Event), or the execution by the Company of any agreement with
        respect to a Reorganization Event (regardless of whether such event will
        result in a Change in Control Event), the Board shall provide that all
        outstanding Options shall be assumed, or equivalent options shall be
        substituted, by the acquiring or succeeding corporation (or an affiliate
        thereof); provided that if such Reorganization Event also constitutes a
        Change in Control Event, except to the extent specifically provided to
        the contrary in the instrument evidencing any Option or any other
        agreement between a Participant and the Company, such assumed or
        substituted options shall be immediately exercisable in full upon the
        occurrence of such Reorganization Event. For purposes hereof, an Option
        shall be considered to be assumed if, following consummation of the
        Reorganization Event, the Option confers the right to purchase, for each
        share of Common Stock subject to the Option immediately prior to the
        consummation of the Reorganization Event, the consideration (whether
        cash, securities or other property) received as a result of the
        Reorganization Event by holders of Common Stock for each share of Common
        Stock held immediately prior to the consummation of the Reorganization

                                       A-5
<PAGE>   33

        Event (and if holders were offered a choice of consideration, the type
        of consideration chosen by the holders of a majority of the outstanding
        shares of Common Stock); provided, however, that if the consideration
        received as a result of the Reorganization Event is not solely common
        stock of the acquiring or succeeding corporation (or an affiliate
        thereof), the Company may, with the consent of the acquiring or
        succeeding corporation, provide for the consideration to be received
        upon the exercise of Options to consist solely of common stock of the
        acquiring or succeeding corporation (or an affiliate thereof) equivalent
        in fair market value to the per share consideration received by holders
        of outstanding shares of Common Stock as a result of the Reorganization
        Event.

             Notwithstanding the foregoing, if the acquiring or succeeding
        corporation (or an affiliate thereof) does not agree to assume, or
        substitute for, such Options, then the Board shall, upon written notice
        to the Participants, provide that all then unexercised Options will
        become exercisable in full as of a specified time prior to the
        Reorganization Event and will terminate immediately prior to the
        consummation of such Reorganization Event, except to the extent
        exercised by the Participants before the consummation of such
        Reorganization Event; provided, however, in the event of a
        Reorganization Event under the terms of which holders of Common Stock
        will receive upon consummation thereof a cash payment for each share of
        Common Stock surrendered pursuant to such Reorganization Event (the
        "Acquisition Price"), then the Board may instead provide that all
        outstanding Options shall terminate upon consummation of such
        Reorganization Event and that each Participant shall receive, in
        exchange therefor, a cash payment equal to the amount (if any) by which
        (A) the Acquisition Price multiplied by the number of shares of Common
        Stock subject to such outstanding Options (whether or not then
        exercisable), exceeds (B) the aggregate exercise price of such Options.

             (b)  Change in Control Event that is not a Reorganization
        Event.  Upon the occurrence of a Change in Control Event that does not
        also constitute a Reorganization Event, except to the extent
        specifically provided to the contrary in the instrument evidencing any
        Option or any other agreement between a Participant and the Company, all
        Options then-outstanding shall automatically become immediately
        exercisable in full.

          (3)  Effect on Restricted Stock Awards

             (a)  Reorganization Event that is not a Change in Control
        Event.  Upon the occurrence of a Reorganization Event that is not a
        Change in Control Event, the repurchase and other rights of the Company
        under each outstanding Restricted Stock Award shall inure to the benefit
        of the Company's successor and shall apply to the cash, securities or
        other property which the Common Stock was converted into or exchanged
        for pursuant to such Reorganization Event in the same manner and to the
        same extent as they applied to the Common Stock subject to such
        Restricted Stock Award.

             (b)  Change in Control Event.  Upon the occurrence of a Change in
        Control Event (regardless of whether such event also constitutes a
        Reorganization Event), except to the extent specifically provided to the
        contrary in the instrument evidencing any Restricted Stock Award or any
        other agreement between a Participant and the Company, all restrictions
        and conditions on all Restricted Stock Awards then-outstanding shall
        automatically be deemed terminated or satisfied.

                                       A-6
<PAGE>   34

          (4)  Effect on Other Awards

             (a)  Reorganization Event that is not a Change in Control
        Event.  The Board shall specify the effect of a Reorganization Event
        that is not a Change in Control Event on any other Award granted under
        the Plan at the time of the grant of such Award.

             (b)  Change in Control Event.  Upon the occurrence of a Change in
        Control Event (regardless of whether such event also constitutes a
        Reorganization Event), except to the extent specifically provided to the
        contrary in the instrument evidencing any other Award or any other
        agreement between a Participant and the Company, all other Awards shall
        become exercisable, realizable or vested in full, or shall be free of
        all conditions or restrictions, as applicable to each such Award.

          (5)  Limitations.  Notwithstanding the foregoing provisions of this
     Section 8(c), if the Change in Control Event is intended to be accounted
     for as a "pooling of interests" for financial accounting purposes, and if
     the acceleration to be effected by the foregoing provisions of this Section
     8(c) would preclude accounting for the Change in Control Event as a
     "pooling of interests" for financial accounting purposes, then no such
     acceleration shall occur upon the Change in Control Event.

9.  GENERAL PROVISIONS APPLICABLE TO AWARDS

     (a)  Transferability of Awards.  Except as the Board may otherwise
determine or provide in an Award, Awards shall not be sold, assigned,
transferred, pledged or otherwise encumbered by the person to whom they are
granted, either voluntarily or by operation of law, except by will or the laws
of descent and distribution, and, during the life of the Participant, shall be
exercisable only by the Participant. References to a Participant, to the extent
relevant in the context, shall include references to authorized transferees.

     (b)  Documentation.  Each Award shall be evidenced by a written instrument
in such form as the Board shall determine. Each Award may contain terms and
conditions in addition to those set forth in the Plan.

     (c)  Board Discretion.  Except as otherwise provided by the Plan, each
Award may be made alone or in addition or in relation to any other Award. The
terms of each Award need not be identical, and the Board need not treat
Participants uniformly.

     (d)  Termination of Status.  The Board shall determine the effect on an
Award of the disability, death, retirement, authorized leave of absence or other
change in the employment or other status of a Participant and the extent to
which, and the period during which, the Participant, the Participant's legal
representative, conservator, guardian or Designated Beneficiary may exercise
rights under the Award.

     (e)  Withholding.  Each Participant shall pay to the Company, or make
provision satisfactory to the Board for payment of, any taxes required by law to
be withheld in connection with Awards to such Participant no later than the date
of the event creating the tax liability. Except as the Board may otherwise
provide in an Award, when the Common Stock is registered under the Exchange Act,
Participants may, to the extent then permitted under applicable law, satisfy
such tax obligations in whole or in part by delivery of shares of Common Stock,
including shares retained from the Award creating the tax obligation, valued at
their Fair Market Value. The Company may, to the extent permitted by law, deduct
any such tax obligations from any payment of any kind otherwise due to a
Participant.

     (f)  Amendment of Award.  The Board may amend, modify or terminate any
outstanding Award, including but not limited to, substituting therefor another
Award of the same or a different type, changing the date of exercise or
realization, and converting an Incentive Stock Option to a Nonstatutory Stock

                                       A-7
<PAGE>   35

Option, provided that the Participant's consent to such action shall be required
unless the Board determines that the action, taking into account any related
action, would not materially and adversely affect the Participant.

     (g)  Conditions on Delivery of Stock.  The Company will not be obligated to
deliver any shares of Common Stock pursuant to the Plan or to remove
restrictions from shares previously delivered under the Plan until (i) all
conditions of the Award have been met or removed to the satisfaction of the
Company, (ii) in the opinion of the Company's counsel, all other legal matters
in connection with the issuance and delivery of such shares have been satisfied,
including any applicable securities laws and any applicable stock exchange or
stock market rules and regulations, and (iii) the Participant has executed and
delivered to the Company such representations or agreements as the Company may
consider appropriate to satisfy the requirements of any applicable laws, rules
or regulations.

     (h)  Acceleration.  The Board may at any time provide that any Options
shall become immediately exercisable in full or in part, that any Restricted
Stock Awards shall be free of restrictions in full or in part or that any other
Awards may become exercisable in full or in part or free of some or all
restrictions or conditions, or otherwise realizable in full or in part, as the
case may be.

10.  MISCELLANEOUS

     (a)  No Right To Employment or Other Status.  No person shall have any
claim or right to be granted an Award, and the grant of an Award shall not be
construed as giving a Participant the right to continued employment or any other
relationship with the Company. The Company expressly reserves the right at any
time to dismiss or otherwise terminate its relationship with a Participant free
from any liability or claim under the Plan, except as expressly provided in the
applicable Award.

     (b)  No Rights As Stockholder.  Subject to the provisions of the applicable
Award, no Participant or Designated Beneficiary shall have any rights as a
stockholder with respect to any shares of Common Stock to be distributed with
respect to an Award until becoming the record holder of such shares.
Notwithstanding the foregoing, in the event the Company effects a split of the
Common Stock by means of a stock dividend and the exercise price of and the
number of shares subject to such Option are adjusted as of the date of the
distribution of the dividend (rather than as of the record date for such
dividend), then an optionee who exercises an Option between the record date and
the distribution date for such stock dividend shall be entitled to receive, on
the distribution date, the stock dividend with respect to the shares of Common
Stock acquired upon such Option exercise, notwithstanding the fact that such
shares were not outstanding as of the close of business on the record date for
such stock dividend.

     (c)  Effective Date and Term of Plan.  The Plan shall become effective on
the date on which it is adopted by the Board, but no Award granted to a
Participant that is intended to comply with Section 162(m) shall become
exercisable, vested or realizable, as applicable to such Award, unless and until
the Plan has been approved by the Company's stockholders to the extent
stockholder approval is required by Section 162(m) in the manner required under
Section 162(m) (including the vote required under Section 162(m)). No Awards
shall be granted under the Plan after the completion of ten years from the
earlier of (i) the date on which the Plan was adopted by the Board or (ii) the
date the Plan was approved by the Company's stockholders, but Awards previously
granted may extend beyond that date.

     (d)  Amendment of Plan.  The Board may amend, suspend or terminate the Plan
or any portion thereof at any time, provided that to the extent required by
Section 162(m), no Award granted to a Participant that is intended to comply
with Section 162(m) after the date of such amendment shall become exercisable,
realizable or vested, as applicable to such Award, unless and until such
amendment

                                       A-8
<PAGE>   36

shall have been approved by the Company's stockholders as required by Section
162(m) (including the vote required under Section 162(m)).

     (e)  Governing Law.  The provisions of the Plan and all Awards made
hereunder shall be governed by and interpreted in accordance with the laws of
the State of Delaware, without regard to any applicable conflicts of law.

                                       A-9
<PAGE>   37

                                  DETACH HERE

                                     PROXY

                        ARCH COMMUNICATIONS GROUP, INC.

                        1800 WEST PARK DRIVE, SUITE 250
                        WESTBOROUGH, MASSACHUSETTS 01581

             ANNUAL MEETING OF STOCKHOLDERS TO BE HELD MAY 16, 2000

          THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

     The undersigned hereby appoints C. Edward Baker, Jr., Gerald J. Cimmino,
Patricia A. Gray and David A. Westenberg, and each of them, the proxies of the
undersigned with power of substitution to each of them, to vote all shares of
Arch Communications Group, Inc. which the undersigned is entitled to vote at
the annual meeting of stockholders to be held on Tuesday, May 16, 2000, at
11:00 a.m. (local time) at Hale and Dorr LLP, 31st Floor, 60 State Street,
Boston, Massachusetts 02109.

     In their discretion, the proxies are authorized to vote on such other
matters as may properly come before the annual meeting or any adjournment
thereof.

     Please return your cards in the enclosed envelope to the following address:
                                     Arch Communications Group
                                     c/o EquiServe
                                     P.O. Box 9398
                                     Boston, MA 02205-9398

              CONTINUED AND TO BE DATED AND SIGNED ON REVERSE SIDE

SEE REVERSE                                                          SEE REVERSE
    SIDE                                                                 SIDE
<PAGE>   38

<TABLE>
<S>                                                                          <C>
                                                                                                               FOR  AGAINST ABSTAIN
[X] PLEASE MARK                                                             2.  Approve an amendment to the    [ ]    [ ]     [ ]
    VOTES AS IN                                                                 Non-Employee Directors' Stock
    THIS EXAMPLE.                                                               Option Plan increasing the
                                                                                number of shares of common
1.  Election of Directors.                                                      stock issuable under the plan
    NOMINEES:  (01) John B. Saynor, (02) John A. Shane,                         from 46,733 to 196,733.
               (03) H. Sean Mathis
                                                                            3.  Approve the 2000 Stock         [ ]    [ ]     [ ]
                 FOR            WITHHELD                  MARK HERE   [ ]       Incentive Plan.
                 [ ]              [ ]                    IF YOU PLAN
                                                          TO ATTEND         4.  Ratify the selection of        [ ]    [ ]     [ ]
                                                         THE MEETING            Arthur Andersen LLP as
                                                                                independent auditors for
[ ] _________________________________________________     MARK HERE   [ ]       fiscal year ending
INSTRUCTION: To withhold authority for any individual    FOR ADDRESS            December 31, 2000.
nominee, write the nominee's name in the space           CHANGE AND
provided above.                                          NOTE BELOW          PLEASE SIGN, DATE AND RETURN THIS PROXY IN THE
                                                                             ENCLOSED POSTAGE PREPAID ENVELOPE.

                                                                             The signature on this Proxy should correspond exactly
                                                                             with stockholder's name as printed to the left. In
                                                                             the case of joint tenants, co-executors or co-trustees,
                                                                             both should sign. Persons signing as Attorney,
                                                                             Executor, Administrator, Trustee or Guardian should
                                                                             give their full title.

                                                                             VOTES MUST BE INDICATED (X) IN BLACK OR BLUE INK.


Signature: _______________________________ Date: ______________     Signature: __________________________________ Date: ____________
</TABLE>


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