Document:

<PAGE>
                                                                    EXHIBIT 10.8

                                    AMENDMENT
                                     TO THE
                            SHARE PURCHASE AGREEMENT

     Reference is made to that certain Share Purchase Agreement (the
"Agreement") entered into as of July 20, 2001, by and among MetaSolv, Inc., a
Delaware corporation (the "Company"), MetaSolv Canada Inc., a corporation
incorporated under the laws of Nova Scotia and a wholly-owned subsidiary of the
Company ("MetaSolv Canada"), MetaSolv Canada Holdings Inc., a corporation
incorporated under the laws of Nova Scotia and a wholly-owned subsidiary of
MetaSolv Canada ("MCH"), LAT45(degree) Information Systems Inc., a corporation
incorporated under the federal laws of Canada ("LAT45"), each of the
shareholders of LAT45 and each of Joseph Hatchuel, Toufik Abdallah, Serge
Bouhadana and Jean-Nicolas Guet. This Amendment to the Share Purchase Agreement
(this "Amendment") is entered into as of August 20, 2001, by and between MCH and
Joseph Hatchuel, the shareholders' representative appointed pursuant to Section
8.16 of the Agreement (the "Shareholders' Representative").

                                    RECITALS:
                                    --------

     A. MCH and the Shareholders' Representative wish to enter into this
Amendment to amend and restate Schedule 6.2(b)(viii) to the Agreement in its
entirety.

     B. Pursuant to Section 8.3 of the Agreement, the Agreement may be amended
in writing by MCH and the Shareholders' Representative.

     NOW, THEREFORE, for valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties hereto agree as follows:

                                   AGREEMENTS:
                                   ----------

     1. The parties hereto agree that Schedule 6.2(b)(viii) to the Agreement
shall be amended and restated in its entirety to read as set forth on Exhibit A
                                                                      ---------
hereto.

     2. The parties hereto agree that, except as set forth above in paragraph 1,
the Agreement shall remain unaffected and in full force and effect.

               [THE REMAINDER OF THIS PAGE IS INTENTIONALLY BLANK]

                                       1

<PAGE>

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

                                    METASOLV CANADA HOLDINGS INC.

                                    By: /s/ Jonathan K. Hustis
                                        ----------------------------------------
                                    Name:   Jonathan K. Hustis
                                          --------------------------------------
                                    Title:  Secretary
                                           -------------------------------------

                                    SHAREHOLDERS' REPRESENTATIVE:

                                    /s/ Joseph Hatchuel
                                    --------------------------------------------
                                    Joseph Hatchuel

                                       2

<PAGE>

                                    EXHIBIT A

                              Schedule 6.2(b)(viii)

Name                                              Number of Shares
----                                              ----------------
Joseph Hatchuel                                         87,500
Toufik Abdallah                                         87,500
Serge Bouhadana                                         87,500
Jean-Nicolas Guet                                       87,500
Patrice Trudel                                          37,300
Toni Arcuri                                             33,300
Sarah Minciotti                                         33,300
Pascal Bouvry                                           20,300
Benoit Lemieux                                          18,000
Roland Younes                                           16,000
Sam Bouhadana                                           16,000
Tom Turnbull                                            13,000
Ignacio Troncoso                                        13,000
Eric Baelens                                            12,000
Ghada Boutanios                                         11,000
Aaron Minciotti                                         11,000
Miguel Figueroa                                          9,000
Marie Tremblay                                           2,500
Herve Francois                                           2,500
Toufik Issad                                               600
Nassim Fath Bouabcha                                       300
Paola Oriani                                               300
Fernando Gutierrez                                         200
Antoinette Giuffrida                                       200
Gilbert Cousineau                                          200
                                                           ---

Total                                                  600,000

                                      A-1<PAGE>
                                                        [REVISED EXECUTION COPY]

                       THIRD AMENDMENT AND LIMITED WAIVER
                                       TO
                    FIFTH AMENDED AND RESTATED LOAN AGREEMENT

        THIS THIRD AMENDMENT AND LIMITED WAIVER TO FIFTH AMENDED AND RESTATED
LOAN AGREEMENT (this "Third Amendment") is made as of this 25th day of February,
2002 by and among Metrocall, Inc., a Delaware corporation (the "Borrower"), the
Lenders (as defined in the Loan Agreement defined below) signatory hereto and
Toronto Dominion (Texas), Inc. (the "Administrative Agent" and collectively with
the Documentation Agent and the Co-Documentation Agent (each as defined in the
Loan Agreement defined below), the "Agents"), as administrative agent for the
Lenders.

                                   WITNESSETH:

        WHEREAS, the Borrower, the Lenders and the Agents are all parties to
that certain Fifth Amended and Restated Loan Agreement dated as of March 17,
2000, as amended by the First Amendment to Fifth Amended and Restated Loan
Agreement dated as of June 20, 2000 and the Second Amendment to Fifth Amended
and Restated Loan Agreement dated as of December 31, 2000 (as so amended, the
"Loan Agreement");

        WHEREAS, the Borrower, the Administrative Agent and the Lenders wish to
eliminate the options of the Borrower to borrow Eurodollar Advances pursuant to
Section 2.2(a) of the Loan Agreement, to Convert Base Rate Advances, in whole or
in part, into Eurodollar Advances pursuant Section 2.2(b)(ii) of the Loan
Agreement or to Continue Eurodollar Advances, in whole or in part, as Eurodollar
Advances pursuant to Section 2.2(c)(ii) of the Loan Agreement;

        WHEREAS, as more fully set forth in the Administrative Agent's Notice of
Default, dated March 22, 2001, certain Events of Default under Section 8.1(k) of
the Loan Agreement (the "Bond Indenture Cross-Default Events of Default") have
occurred and are continuing;

        WHEREAS, in addition to the Bond Indenture Cross-Default Events of
Default, certain Events of Default under Section 8.1(c) of the Loan Agreement
have occurred and are continuing based on the Borrower's default in the
performance or observance of the covenants contained in Sections 7.9 (Total
Leverage Ratio), 7.10 (Annualized Operating Cash Flow to Pro Forma Debt Service
Ratio) and 7.12 (Operating Cash Flow to New Cash Interest Expense Ratio) of the
Loan Agreement (collectively with the Bond Indenture Cross-Default Events of
Default, the "Existing Events of Default");

        WHEREAS, as a result of the Bond Indenture Cross-Default Events of
Default and the other Existing Events of Default, interest on the outstanding
Obligations has accrued at the Default Rate from and after March 16, 2001,
payment of which has not been demanded by the Majority Lenders; and

        WHEREAS, the Borrower has requested, and the Administrative Agent and
the Lenders signatory hereto have agreed that, subject to the terms hereof,
certain of the provisions of the
<PAGE>
Loan Agreement be amended and waived pursuant to this Third Amendment as more
specifically described below;

        NOW, THEREFORE, the parties hereto agree that all capitalized terms used
herein which are not otherwise defined herein shall have the meanings ascribed
thereto in the Loan Agreement, and further agree as follows:

        1.      Amendment to Article 1, Definitions. Article 1 of the Loan
Agreement, Definitions, is hereby amended by replacing the current definitions
of each of the following terms with the following definitions:

                        "Applicable Margin" shall have the meaning given such
                term in Section 2.3(f) hereof.

                        "Interest Period" shall mean the period beginning on the
                date such Advance is made, or Converted to a Base Rate Advance,
                and ending on the last day of the calendar month in which such
                Advance is made, or Converted to a Base Rate Advance, provided,
                however, that if the Advance is made or Converted on the last
                day of any calendar month, it shall have an Interest Period
                ending on, and its Payment Date shall be, the last day of the
                following calendar month.

                        "Majority Waiving Lenders" has the meaning specified in
                Section 9 of the Third Amendment.

                        "Proceeding" has the meaning specified in Section 9 of
                the Third Amendment.

                        "Third Amendment" means the Third Amendment and Limited
                Waiver to Fifth Amendment and Restated Loan Agreement, dated
                February 25, 2002.

                        "Third Amendment Effective Date" has the meaning
                specified in Section 12 of the Third Amendment.

                        "Waiver Period Interest" has the meaning specified in
                Section 9 of the Third Amendment.

        2.      Amendment of Section 2.1(a). Section 2.1(a) of the Loan
Agreement is hereby amended by deleting the final sentence thereof.

        3.      Amendment of Section 2.1(b). Section 2.1(b) of the Loan
Agreement is hereby amended by amending and restating the final sentence thereof
to read as follows:

                        "There shall be no increase in the amount of the
                Facility B Loans outstanding on the Agreement Date."

<PAGE>
        4. Amendment of Section 2.2(a). Section 2.2(a) of the Loan Agreement is
hereby amended and restated to read as follows:

                (a) Interest Rate, etc. Any Advance shall be made as a Base Rate
           Advance and the Borrower shall have no option to borrow a Eurodollar
           Advance.

        5. Deletion of Section 2.2(b)(ii). Section 2.2(b)(ii), together with
each reference thereto in the Loan Agreement, is hereby delete in its entirety.

        6. Amendment of Section 2.2(c). Section 2.2(c) is hereby amended and
restated to read as follows:

                Continuation of Eurodollar Rate Loans. No Eurodollar Rate
           Advance may be Continued and each Eurodollar Rate Advance in effect
           shall automatically Convert to a Base Rate Loan on the next Payment
           Date.

        7. Amendment of Section 2.3(f). Section 2.3(f) of the Loan Agreement is
hereby amended and restated to read as follows:

                (f) Applicable Margin. The Applicable Margin shall, effective as
        of January 1, 2002, and at all times thereafter, equal 2.875%.

        8. Payment of Certain Additional Interest. Notwithstanding anything in
this Third Amendment or the Loan Agreement to the contrary, (i) interest on all
Base Rate Advances outstanding during the period October 1, 2001 through the
Third Amendment Effective Date shall be recomputed based on an Applicable Margin
for said period equal to 2.875% and (ii) the amount of any such additional
previously unpaid interest with respect to such recomputations for said period
shall be payable on the first Payment Date following the Third Amendment
Effective Date.

        9. Limited Waiver of Demand for Payment of Certain Default Rate
Interest. The Majority Lenders signatory hereto (collectively, the "Majority
Waiving Lenders") each hereby irrevocably waives any demand for payment, by the
Borrower or any of its subsidiaries, whether pursuant to the Credit Agreement,
any Subsidiary Guarantees or otherwise, or interest at the Default Rate on the
outstanding Obligations accrued on the outstanding Obligations during the period
from and after March 16, 2001 through the Third Amendment Effective Date (the
"Waiver Period Interest"). This Waiver shall be binding on all successors and
assigns of the Lenders and shall be binding in connection with any subsequent
proceeding, with respect to the Borrower or any of its subsidiaries, under Title
11 of the United States Code or similar law. By way of further assurance with
respect to the foregoing, each of the Majority Waiving Lenders hereby agrees
that it will not object to or oppose confirmation of any plan of reorganization
proposed by the Borrower and/or its subsidiaries in connection with any
Proceeding based on the failure of said plan to provide for payment to the
Lenders of the Waiver Period Interest.

<PAGE>

        10. Strict Compliance. Except for the amendment and waivers set forth
above, the text of the Loan Agreement shall remain unchanged and in full force
and effect. The amendment and waivers agreed to herein shall not constitute a
modification of the Loan Agreement or a course of dealing with the Agents and
the Lenders, or any of them, at variance with the Loan Agreement such as to
require further notice by the Administrative Agent, the Lenders, the Majority
Lenders, or any of them, or to require strict compliance with the terms of the
Loan Agreement, as amended by this Third Amendment, in the future.

        11. Representations and Warranties. The Borrower hereby represents and
warrants to and in favor of the Administrative Agent and the Lenders as follows:

                (a) Except as disclosed in the Borrower's Form 10-Q for the
quarterly period ended September 30, 2001 (none of which disclosures shall be
deemed adopted, ratified or in any way approved by the Administrative Agent or
any of the Lenders), each representation and warranty set forth in Article 4 of
the Loan Agreement, as amended hereby, is hereby restated and affirmed as true
and correct in all material respects as of the date hereof, except to the extent
previously fulfilled in accordance with the terms of the Loan Agreement, as
amended hereby, and to the extent relating specifically to the Agreement Date or
otherwise inapplicable;

                (b) The Borrower has the corporate power and authority (i) to
enter into this Third Amendment and (ii) to do all acts and things as are
required or contemplated hereunder to be done, observed and performed by it;

                (c) This Third Amendment has been duly authorized, validly
executed and delivered by one or more Authorized Signatories of the Borrower,
and each of this Third Amendment and the Loan Agreement as amended hereby
constitutes the legal, valid and binding obligations of the Borrower,
enforceable against the Borrower in accordance with its terms, subject, as to
enforcement of remedies, to the following qualifications: (i) an order of
specific performance and injunction are discretionary remedies and, in
particular, may not be available where damages are considered an adequate remedy
at law and (ii) enforcement may be limited by bankruptcy, insolvency,
liquidation, reqorganization, reconstruction and other similar laws affecting
enforcement of creditors' rights generally (insofar as any such law relates to
the bankruptcy, insolvency or similar event of the Borrower); and

                (d) The execution and delivery of this Third Amendment and
performance by the Borrower under the Loan Agreement, as amended hereby, does
not and will not require the consent or approval of any regulatory authority or
governmental authority or agency having jurisdiction over the Borrower which has
not already been obtained, nor be in contravention of or in conflict with the
Certificate of Incorporation or By-Laws of the Borrower, or any provision of any
statute, judgment, order, indenture, instrument, agreement, or undertaking, to
which the Borrower is party or by which the Borrower's assets or properties are
bound.

        12. Conditions Precedent to Effectiveness of this Third Amendment. This
Third Amendment shall become effective as or the date first written above (the
"Third Amendment Effective Date") when each of the following has been satisfied
or waived in accordance with Section 11.12 of the Loan Agreement:
<PAGE>
               (a)     all of the representations and warranties of the Borrower
under Section 11 hereof which are made of the date hereof, being true and
correct in all material respects; and

               (b)     receipt of any other documents or instruments that the
Administrative Agent, the Lenders, or any of them, may reasonably request,
certified by an officer of the Borrower if so requested.

       13.    Counterparts. This Third Amendment may be executed in multiple
counterparts, each of which shall be deemed to be an original and all of which
when taken together shall constitute one and the same agreement.

       14.    Law of Contract. This Third Amendment shall be deemed to be made
pursuant to the laws of the State of New York and shall be construed,
interpreted, performed and enforced in accordance therewith.

       15.    Loan Document. This Third Amendment shall contitute a Loan
Document.

       IN WITNESS WHEREOF, the parties hereto have caused their respective duly
authorized officers or representatives to execute and deliver this Third
Amendment as of the day and year first above written.

                [REMAINDER OF THE PAGE INTENTIONALLY LEFT BLANK
                            SIGNATURE PAGES FOLLOW]
<PAGE>
BORROWER:                                METROCALL, INC.

                                         By: /s/ VINCENT D. KELLY
                                            -------------------------------
                                            Name: Vincent D. Kelly
                                                 --------------------------
                                            Title: CFO
                                                  -------------------------

ADMINISTRATIVE AGENT AND LENDERS:        TORONTO DOMINION (TEXAS), INC., as
                                         Administrative Agent and a Lender

                                         By: /s/ JEFFREY R. LENTS
                                            -------------------------------
                                            Name: Jeffrey R. Lents
                                                 --------------------------
                                            Title: CFO
                                                  -------------------------

                                         ENDEAVOR L.L.C., as a Lender, by
                                         PPM America, Inc., its attorney-in-fact

                                         By: /s/ B. T. SCHINDERLE
                                            -------------------------------
                                            Name: BRIAN T. SCHINDERLE
                                                 --------------------------
                                            Title: Senior Managing Director
                                                  -------------------------

                                         FIRST UNION NATIONAL BANK, as a Lender

                                         By: /s/ REGINALD T. DAWSON
                                            -------------------------------
                                            Name: REGINALD T. DAWSON
                                                 --------------------------
                                            Title: Senior Vice President
                                                  -------------------------
<PAGE>
                                       FLEET NATIONAL BANK, as a Lender

                                       By: [SIG]
                                          ----------------------------------
                                          Name: [SIG]
                                               -----------------------------
                                          Title: Senior Vice President
                                                ----------------------------

                                       COMMERCIAL LOAN FUNDING TRUST I, as a
                                       Lender
                                       By: Lehman Commercial Paper, Inc., not
                                       in its individual capacity but solely as
                                       administrative agent

                                       By:
                                          ----------------------------------
                                          Name:
                                               -----------------------------
                                          Title:
                                                ----------------------------

                                       KZH CNC LLC, as a Lender

                                       By:
                                          ----------------------------------
                                          Name:
                                               -----------------------------
                                          Title:
                                                ----------------------------

                                       MORGAN STANLEY SENIOR FUNDING, INC.,
                                       as a Lender

                                       By:/s/ STEPHEN HANNAN
                                          ----------------------------------
                                          Name: STEPHEN HANNAN
                                               -----------------------------
                                          Title: VICE PRESIDENT
                                                ----------------------------
<PAGE>
                                           PNC BANK, NATIONAL ASSOCIATION, as a
                                           Lender

                                           By:
                                              ----------------------------------
                                              Name:
                                                   -----------------------------
                                              Title:
                                                    ----------------------------

                                           CAPITAL CROSSOVER PARTNERS LP, as a
                                           Lender

                                           By: /s/ [SIG]
                                              ----------------------------------
                                              Name: [SIG]
                                                   -----------------------------
                                              Title: PARTNER
                                                    ----------------------------

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