Document:

<PAGE>   1
                                  EXHIBIT 10.2

               AMENDMENT FIFTEEN TO INSURANCE PROCESSING AGREEMENT

This document is Amendment Fifteen to the Insurance Processing Agreement, made
and entered into effective June 1, 1993, and amended by Amendment One to
Insurance Processing dated June 4, 1998; Amendment Two to Insurance Processing
Agreement dated September 25, 1998; Amendment Three to Insurance Processing
Agreement dated October 19, 1998; Amendment Four to Insurance Processing
Agreement dated December 15, 1998; Amendment Five to Insurance Processing
Agreement dated March 25, 1999; Amendment Six to Insurance Processing Agreement
dated May 10, 1999; Amendment Seven to Insurance Processing Agreement dated June
24, 1999; Amendment Eight to Insurance Processing Agreement dated August 5,
1999; Amendment Nine to Insurance Processing Agreement dated October 1, 1999;
Amendment Ten to Insurance Processing Agreement dated January 31, 2000;
Amendment Eleven to Insurance Processing Agreement dated March 1, 2000;
Amendment Twelve to Insurance Processing Agreement dated April 19, 2000;
Amendment Thirteen to Insurance Processing Agreement dated July 31, 2000; and
Amendment Fourteen to Insurance Processing Agreement dated September 25, 2000
(the "Agreement"), by and between American National Insurance Company ("American
National") a Texas corporation, and Legacy Marketing Group ("LMG"), a California
corporation.

In consideration of mutual covenants contained herein, the parties agree as
follows:

1.     Section 6.1 of the Agreement is hereby deleted in its entirety and the
       following new Section 6.1 shall be substituted therefore:

       "6.1 Subject to termination as hereinafter provided, this Agreement shall
       remain in force and effect until the close of business on November 30,
       2000, the term of this Agreement. This Agreement may be renewed by mutual
       agreement for additional successive terms of one (1) year unless
       terminated by either party by prior written notice to the other at least
       one hundred eighty (180) days prior to the end of the initial term or the
       renewal term."

2.     Except as specifically amended hereby, all terms and provisions of the
       Insurance Processing Agreement shall remain in full force and effect.

<TABLE>
<CAPTION>
       LEGACY MARKETING GROUP                               AMERICAN NATIONAL INSURANCE
                                                              COMPANY
<S>                                                  <C>
       By:          /s/ Preston Pitts                By:           /s/ Kelly M. Collier
                      -----------------                              --------------------

       Title:       President                        Title:        V. P. Alternative Distribution
                    ---------                                      ------------------------------

       Witness:     /s/ Anne Sedleniek               Witness:      /s/Jynx Yucra
                    ------------------                             -------------

       Date:        October 31, 2000                 Date:         October 27, 2000
                    -----------------                              ----------------
</TABLE><PAGE>   1

                                                                    EXHIBIT 10.1

                  CALENDAR YEAR 2000 AMENDMENT TO THE BTG, INC.

                         1995 EMPLOYEE STOCK OPTION PLAN

         Effective January 17, 2000, the second sentence of paragraph 1 of
Article 3 of the BTG, Inc. 1995 Employee Stock Option Plan is hereby deleted in
its entirety and replaced with the following sentence:

                  The number of shares of Stock that may be issued pursuant to
                  Options granted under the Plan shall not exceed in the
                  aggregate 1,750,000 shares of Stock, which number of shares is
                  subject to adjustment as provided in Section 19 hereof.

                                      -18-<PAGE>   1
                                                                   EXHIBIT 10.1

July 31, 2000

LEMIS ALTAN
One Digex Plaza
Beltsville, MD 20705

Dear Lemis:

This is to confirm your promotion to the position of Vice President of
Business Operations, reporting to Mark Shull, President & Chief Executive
Officer of Digex, Inc. This position is a regular, full time position located
in our Beltsville campus.

BASE SALARY

Your annual base salary is $160,000 (based on 52 weeks of service). This
position is exempt and is not eligible for overtime. Salaries are reviewed
annually, and increases are granted in accordance with Company policy.

COMPENSATION

You are eligible to participate in Digex's Executive Management Incentive
Compensation Plan. In this position, you are eligible for a bonus of up to
40% of your base salary. At 100% of personal objective achievement and
Executive Corporate Goals achievement your annual potential cash compensation
is $224,000. (based upon base salary plus full bonus compensation)

This incentive is prorated on the base pay received during the current
fiscal calendar year. This incentive opportunity is contingent upon the
achievement of corporate and individual objectives as determined by your
management. This bonus is evaluated and paid on an annual basis.

STOCKS

This position includes an increase in stock options bringing you to a total of
75,000 total shares of DIGX Stock Options, contingent upon approval by the
Compensation Committee of the Board of Directors. The option price of the award
is the market price of Digex, Inc. common stock on the date that the grant
is approved.

Vesting of the award will begin with the approval of the grant and will
continue over a four-year period. 25% of the shares covered by the options
will vest one year following the date of grant. The balance of the shares will
vest in equal quarterly installments over the next three years so long as you
continue to be employed by Digex. Additionally, upon a change in control of
the company, this grant will fully vest one year following such change.

Details were provided in your Grant Agreement upon approval by the Board of
Directors. The option is issued pursuant to the Company's long term
Incentive Plan and will be subject to all the terms and conditionals of that
plan.

<PAGE>   2

JULY 31, 2000
MS. LEMIS ALTAN
PAGE 2

BENEFITS

As an employee of Digex you are entitled to all employee benefits: Medical
insurance, medical and prescription drug card, dental insurance, short and
long-term disability, life insurance, 401(k) plan, educational reimbursement,
holidays, sick leave, vacation time, military leave, bereavement leave, voting
time off and jury duty leave. Your medical benefits will be effective the
first day of the month following your start of employment. An outline of these
benefits is attached. Should you have any benefit questions, please contact
Ms. Jamie Starr, Benefits Manager, (240)264-2491.

As you know, in the ordinary course of business, pay and benefits plans evolve
as laws, employee, and / or business need change. If, in the future, it
becomes necessary to change any of the benefit or compensation plans currently
in effect, these changes will apply to you as they do to other eligible
employees. Furthermore, while this letter is our commitment to employ you in
the previously mentioned position, it does not constitute a contract for a
specific length of employment.

Kindly acknowledge the accuracy of this letter by signing and dating the
enclosed copy of this letter and returning it, hard copy or fax 204-264-2666 to
Human Resources at your earliest convenience.

If you have any questions or need additional information, please feel free to
call David Gay, Director Employment, at (240) 264-4712 or fax at (240)
264-2666. I wish you success in the continuation of your career with Digex.

Sincerely yours,

/s/ MARK SHULL

Mark Shull
CEO & President of Digex, Inc.

Encl.

/s/ LEMIS ALTAN                       8/01/00
----------------------------       --------------
Accepted: Lemis Altan              Date:<PAGE>   1
                                                                   EXHIBIT 10.2

                                   EXHIBIT C-2
                          AMENDED AND RESTATED GUARANTY
                                    (Limited)

        THIS AMENDED AND RESTATED GUARANTY (this "GUARANTY") is executed as of
October 31, 2000, by the undersigned ("GUARANTOR"), for the benefit of BANK OF
AMERICA, N.A., a national banking association (in its capacity as Administrative
Agent for the Lenders).

A.      WHEREAS, Intermedia Communications Inc. ("BORROWER"), Bank of America,
N.A., as Administrative Agent (including its permitted successors and assigns in
such capacity, "ADMINISTRATIVE AGENT"), and Lenders now or hereafter party to
the Credit Agreement (including their respective permitted successors and
assigns, "LENDERS") have entered into a Revolving Credit Agreement, dated as of
December 22, 1999 (as amended, modified, supplemented, or restated from time to
time, the "CREDIT AGREEMENT"); and

B.      WHEREAS, provisions of the Credit Agreement permit Guarantor to directly
or indirectly receive proceeds of Borrowings made pursuant thereto; and

C.      WHEREAS, Guarantor executed a Guaranty in connection with the Credit
Agreement guaranteeing the Guaranteed Debt; and

D.      WHEREAS, Guarantor has requested that Lenders amend this Guarantor's
Guaranty to limit the Guaranteed Debt under such Guaranty and Lenders have
consented to such request.

        ACCORDINGLY, for adequate and sufficient consideration, the receipt and
adequacy of which are hereby acknowledged, Guarantor guarantees to
Administrative Agent and the Lenders the prompt payment of the Guaranteed Debt
(defined below), as follows:

        1.      DEFINITIONS. Terms defined in the Credit Agreement have the same
meanings when used, unless otherwise defined, in this Guaranty. As used in this
Guaranty:

                BORROWER means Borrower, Borrower as a debtor-in-possession, and
        any receiver, trustee, liquidator, conservator, custodian, or similar
        party appointed for Borrower or for all or substantially all of
        Borrower's assets under any Debtor Relief Law.

                CREDIT AGREEMENT is defined in the recitals to this Guaranty.

                GUARANTEED DEBT means, collectively, (a) the Obligation and (b)
        all present and future costs, attorneys' fees, and expenses reasonably
        incurred by Administrative Agent or any Lender to enforce Borrower's,
        Guarantor's, or any other obligor's payment of any of the Guaranteed
        Debt, including, without limitation (to the extent lawful), all present
        and future amounts that would become due but for the operation of
        Sections 502 or 506 or any other provision of Title 11 of the United
        States Code and all present and future accrued and unpaid interest
        (including, without limitation, all post-maturity interest and any
        post-petition interest in any proceeding under Debtor Relief Laws to
        which Borrower or Guarantor becomes subject).

                GUARANTOR is defined in the preamble to this Guaranty.

DIGEX A&R GUARANTY                                                      GUARANTY
<PAGE>   2

                LENDER means, individually, or LENDERS means, collectively, on
        any date of determination, the Administrative Agent, the Lead Arranger,
        the Syndication Agent, Documentation Agent, Arranging Agents, and the
        Lenders.

                MAXIMUM GUARANTOR LIABILITY means the greater of either (a)
        $90,000,000 less any amounts paid by any Subsidiary of Guarantor under
        any Loan Document or (b) the aggregate amount of any loan, advance,
        extension of credit, or capital contribution from any Company to
        Guarantor or any of Guarantor's Subsidiaries made on or after the date
        of this Guaranty, or any investment in Guarantor or any of Guarantor's
        Subsidiaries by any Company made on or after the date of this Guaranty,
        less (x) any repayment of any such loan, advance, extension of credit,
        capital contribution, or investment by Guarantor or any of Guarantor's
        Subsidiaries, (y) the amount of all dividends and distributions received
        by any Company from Guarantor or any of Guarantor's Subsidiaries, and
        (z) any amounts paid by any Subsidiary of Guarantor under any Loan
        Document.

                SUBORDINATED DEBT means all present and future obligations of
        any Company to Guarantor, whether those obligations are (a) direct,
        indirect, fixed, contingent, liquidated, unliquidated, joint, several,
        or joint and several, (b) due or to become due to Guarantor, (c) held by
        or are to be held by Guarantor, (d) created directly or acquired by
        assignment or otherwise, or (e) evidenced in writing.

        2.      GUARANTY. Subject to the limitation in PARAGRAPH 3 below, this
is an absolute, irrevocable, and continuing guaranty, and the circumstance that
at any time or from time to time the Guaranteed Debt may be paid in full does
not affect the obligation of Guarantor with respect to the Guaranteed Debt
incurred after that. This Guaranty remains in effect until the Guaranteed Debt
is fully paid and performed, all commitments to extend any credit under the Loan
Documents have terminated, and all Financial Hedges with any Lender have
expired. Guarantor may not rescind or revoke its obligations with respect to the
Guaranteed Debt. Notwithstanding any contrary provision, and in addition to the
limitations set forth in PARAGRAPH 3 below, it is the intention of Guarantor,
Lenders, and Administrative Agent that the amount of the Guaranteed Debt
guaranteed by Guarantor by this Guaranty shall be, but not in excess of, the
maximum amount permitted by fraudulent conveyance, fraudulent transfer, or
similar Laws applicable to Guarantor. Accordingly, notwithstanding anything to
the contrary contained in this Guaranty or any other agreement or instrument
executed in connection with the payment of any of the Guaranteed Debt, the
amount of the Guaranteed Debt guaranteed by Guarantor by this Guaranty shall be
limited to an aggregate amount equal to the largest amount that would not render
Guarantor's obligations hereunder subject to avoidance under Section 548 of the
United States Bankruptcy Code or any comparable provision of any applicable
state law.

        3.      LIMITED GUARANTY AND TERMINATION. Notwithstanding anything in
this Guaranty to the contrary, Guarantor's maximum liability to Administrative
Agent and Lenders hereunder with respect to the Guaranteed Debt shall not exceed
the Maximum Guarantor Liability, and in the event of a Default by Borrower in
payment of all or any part of the Guaranteed Debt, Administrative Agent shall
seek no judgment against Guarantor hereunder for payment of any amounts in
excess of the Maximum Guarantor Liability. The Maximum Guarantor Liability shall
not be reduced or affected by any payments, prepayments, releases, or discharges
of any part of the Guaranteed Debt, except to the extent such payments,
prepayments, releases, or discharges result from payments made to Administrative
Agent (for the ratable benefit of the Lenders) by Guarantor hereunder. The
obligations of Guarantor under this Guaranty shall remain in full force and
effect until payment in full of the Guaranteed Debt or the payment in full of
the Maximum Guarantor Liability and termination of all Lenders' commitments or
obligations to make Borrowings under the Credit Agreement. If at any time any
payment of the principal of or interest on any Note or any other amount payable
by any Company or Guarantor under any Loan Document is rescinded or must be
otherwise restored or returned upon

DIGEX A&R GUARANTY                                                      GUARANTY
                                       2
<PAGE>   3

the insolvency, bankruptcy, or reorganization of such Person, the obligations of
such Person under the Loan Documents with respect to such payment shall be
reinstated as though such payment had been due but not made at such time.

        4.      CONSIDERATION. Guarantor represents and warrants that its
liability under this Guaranty may reasonably be expected to directly or
indirectly benefit it.

        5.      CUMULATIVE RIGHTS. If Guarantor becomes liable for any
indebtedness owing by Borrower to Administrative Agent or any Lender, other than
under this Guaranty, that liability may not be in any manner impaired or
affected by this Guaranty. The rights of Administrative Agent or Lenders under
this Guaranty are cumulative of any and all other rights that Administrative
Agent or Lenders may ever have against Guarantor. The exercise by Administrative
Agent or Lenders of any right under this Guaranty or otherwise does not preclude
the concurrent or subsequent exercise of any other right.

        6.      PAYMENT UPON DEMAND. If a Default exists, Guarantor shall, on
demand and without further notice of dishonor and without any notice having been
given to any Guarantor previous to that demand of either the acceptance by
Administrative Agent or Lenders of this Guaranty or the creation or incurrence
of any Guaranteed Debt, pay the amount of the Guaranteed Debt then due and
payable to Administrative Agent and Lenders, subject to PARAGRAPH 3 above. It is
not necessary for Administrative Agent or Lenders, in order to enforce that
payment by any Guarantor, first or contemporaneously to institute suit or
exhaust remedies against Borrower or others liable on any Guaranteed Debt or to
enforce Rights against any collateral securing any Guaranteed Debt.

        7.      SUBORDINATION. The Subordinated Debt is expressly subordinated
to the full and final payment of the Guaranteed Debt. Guarantor agrees not to
accept any payment of any Subordinated Debt from any Company if a Default
exists. If Guarantor receives any payment of any Subordinated Debt in violation
of the foregoing, Guarantor shall hold that payment in trust for Administrative
Agent and Lenders and promptly turn it over to Administrative Agent, in the form
received (with any necessary endorsements), to be applied to the Guaranteed
Debt.

        8.      SUBROGATION AND CONTRIBUTION. Until payment in full of the
Guaranteed Debt, the termination of the Obligation of Lenders to extend credit
under the Loan Documents, and expiration of all Financial Hedges, (a) Guarantor
may not assert, enforce, or otherwise exercise any right of subrogation to any
of the Rights or Liens of Administrative Agent or Lenders or any other
beneficiary against Borrower or any other obligor on the Guaranteed Debt or any
collateral or other security or any right of recourse, reimbursement,
subrogation, contribution, indemnification, or similar right against Borrower or
any other obligor on any Guaranteed Debt or any guarantor of it, (b) Guarantor
defers all of the foregoing rights (whether they arise in equity, under
contract, by statute, under common law, or otherwise), and (c) Guarantor defers
the benefit of, and subordinates any right to participate in, any collateral or
other security given to Administrative Agent or Lenders or any other beneficiary
to secure payment of any Guaranteed Debt.

        9.      NO RELEASE. Guarantor's obligations under this Guaranty may not
be released, diminished, or affected by the occurrence of any one or more of the
following events: (a) any taking or accepting of any other security or assurance
for any Guaranteed Debt; (b) any release, surrender, exchange, subordination,
impairment, or loss of any collateral securing any Guaranteed Debt; (c) any full
or partial release of the liability of any other obligor on the Obligation,
except for any final release resulting from payment in full of such Obligation;
(d) the modification of, or waiver of compliance with, any terms of any other
Loan Document; (e) the insolvency, bankruptcy, or lack of corporate or
partnership power of any other obligor at any time liable

DIGEX A&R GUARANTY                                                      GUARANTY
                                       3
<PAGE>   4

for any Guaranteed Debt, whether now existing or occurring in the future; (f)
any renewal, extension, or rearrangement of any Guaranteed Debt or any
adjustment, indulgence, forbearance, or compromise that may be granted or given
by Administrative Agent or any Lender to any other obligor on the Obligation;
(g) any neglect, delay, omission, failure, or refusal of Administrative Agent or
any Lender to take or prosecute any action in connection with the Guaranteed
Debt or to foreclose, take, or prosecute any action in connection with any Loan
Document; (h) any failure of Administrative Agent or any Lender to notify
Guarantor of any renewal, extension, or assignment of any Guaranteed Debt, or
the release of any security or of any other action taken or refrained from being
taken by Administrative Agent or any Lender against Borrower or any new
agreement between Administrative Agent, any Lender, and Borrower; it being
understood that neither Administrative Agent nor any Lender is required to give
Guarantor any notice of any kind under any circumstances whatsoever with respect
to or in connection with any Guaranteed Debt, other than any notice required to
be given to Guarantor by law or elsewhere in this Guaranty; (i) the
unenforceability of any Guaranteed Debt against any other obligor or any
security securing same because it exceeds the amount permitted by Law, the act
of creating it is ultra vires, the officers creating it exceeded their authority
or violated their fiduciary duties in connection with it, or otherwise; or (j)
any payment of the Obligation to Administrative Agent or any Lender is held to
constitute a preference under any Debtor Relief Law or for any other reason
Administrative Agent or any Lender is required to refund that payment or make
payment to someone else (and in each such instance this Guaranty will be
reinstated in an amount equal to that payment).

        10.     WAIVERS. To the maximum extent lawful, Guarantor waives all
rights by which it might be entitled to require suit on an accrued right of
action in respect of any Guaranteed Debt or require suit against Borrower or
others.

        11.     LOAN DOCUMENTS. By execution hereof, Guarantor covenants and
agrees that certain representations, warranties, terms, covenants, and
conditions set forth in the Loan Documents are applicable to Guarantor and shall
be imposed upon Guarantor, and Guarantor reaffirms that each such representation
and warranty is true and correct and covenants and agrees to promptly and
properly perform, observe, and comply with each such term, covenant, or
condition. Moreover, Guarantor acknowledges and agrees that this Guaranty is
subject to the offset provisions of the Loan Documents in favor of
Administrative Agent and Lenders. In the event the Credit Agreement shall cease
to remain in effect for any reason whatsoever during any period when any part of
the Guaranteed Debt remains unpaid, the terms, covenants, and agreements
incorporated herein by reference shall nevertheless continue in full force and
effect as obligations of Guarantor under this Guaranty.

        12.     RELIANCE AND DUTY TO REMAIN INFORMED. Guarantor confirms that it
has executed and delivered this Guaranty after reviewing the terms and
conditions of the Loan Documents and such other information as it has deemed
appropriate in order to make its own credit analysis and decision to execute and
deliver this Guaranty. Guarantor confirms that it has made its own independent
investigation with respect to Borrower's creditworthiness and is not executing
and delivering this Guaranty in reliance on any representation or warranty by
Administrative Agent or any Lender as to that creditworthiness. Guarantor
expressly assumes all responsibilities to remain informed of the financial
condition of Borrower and any circumstances affecting Borrower's ability to
perform under the Loan Documents to which it is a party or any collateral
securing any Guaranteed Debt.

        13.     NO REDUCTION. The Guaranteed Debt may not be reduced,
discharged, or released because or by reason of any existing or future offset,
claim, or defense (except for the defense of complete and final payment of the
Guaranteed Debt) of Borrower or any other obligor against Administrative Agent
or any Lender or against payment of the Guaranteed Debt, whether that offset,
claim, or defense arises in connection with

DIGEX A&R GUARANTY                                                      GUARANTY
                                       4
<PAGE>   5

the Guaranteed Debt or otherwise. Those claims and defenses include, without
limitation, failure of consideration, breach of warranty, fraud, bankruptcy,
incapacity/infancy, statute of limitations, lender liability, accord and
satisfaction, usury, forged signatures, mistake, impossibility, frustration of
purpose, and unconscionability.

        14.     COMMUNICATIONS ACT. Notwithstanding any other provision of this
Guaranty, any action taken or proposed to be taken by Administrative Agent or
any Lender under this Guaranty which would affect the operational, voting, or
other control of Borrower or Guarantor, shall be pursuant to Section 310(d) of
the Communications Act of 1934 (as amended), applicable state Law, and the
applicable rules and regulations thereunder, and, if and to the extent required
thereby, subject to the prior consent of the FCC or any applicable PUC.

        15.     INSOLVENCY OF GUARANTOR. Should Guarantor become insolvent, or
fail to pay Guarantor's debts generally as they become due, or voluntarily seek,
consent to, or acquiesce in, the benefit or benefits of any Debtor Relief Law
(other than as a creditor or claimant), or become a party to (or be made the
subject of) any proceeding provided for by any Debtor Relief Law (other than as
a creditor or claimant) that could suspend or otherwise adversely affect the
Rights of Administrative Agent or any Lender granted hereunder, then, in any
such event, the Guaranteed Debt shall be, as among Guarantor, Administrative
Agent, and Lenders, a fully matured, due, and payable obligation of Guarantor to
Administrative Agent and Lenders (without regard to whether Borrower is then in
default under the Loan Documents or whether the Obligation, or any part thereof,
is then due and owing by Borrower to any Lender), payable in full by Guarantor
to Lenders upon demand, and the amount thereof so payable shall be the estimated
amount owing in respect of the contingent claim created hereunder.

        16.     LOAN DOCUMENT. This Guaranty is a Loan Document and is subject
to the applicable provisions of SECTIONS 1 and 13 of the Credit Agreement,
including, without limitation, the provisions relating to GOVERNING LAW,
JURISDICTION, VENUE, SERVICE OF PROCESS, AND WAIVER OF JURY TRIAL, all of which
are incorporated into this Guaranty by reference the same as if set forth in
this Guaranty verbatim.

        17.     NOTICES. For purposes of SECTION 13.3 of the Credit Agreement,
Guarantor's address and telecopy number are as set forth next to Guarantor's
signature on the signature page hereof.

        18.     AMENDMENTS, ETC. No amendment, waiver, or discharge to or under
this Guaranty is valid unless it is in writing and is signed by the party
against whom it is sought to be enforced and is otherwise in conformity with the
requirements of SECTION 13.11 of the Credit Agreement.

        19.     ADMINISTRATIVE AGENT AND LENDERS. Administrative Agent is
Administrative Agent for each Lender under the Credit Agreement. All rights
granted to Administrative Agent under or in connection with this Guaranty are
for each Lender's ratable benefit. Administrative Agent may, without the joinder
of any Lender, exercise any Rights in Administrative Agent's or Lenders' favor
under or in connection with this Guaranty. Administrative Agent's and each
Lender's Rights and obligations vis-a-vis each other may be subject to one or
more separate agreements between those parties. However, Guarantor is not
required to inquire about any such agreement or is subject to any terms of it
unless Guarantor specifically joins it. Therefore, neither Guarantor nor its
successors or assigns is entitled to any benefits or provisions of any such
separate agreement or is entitled to rely upon or raise as a defense any party's
failure or refusal to comply with the provisions of it.

DIGEX A&R GUARANTY                                                      GUARANTY
                                       5
<PAGE>   6

        20.     PARTIES. This Guaranty benefits Administrative Agent, Lenders,
and their respective successors and assigns and binds Guarantor and its
successors and assigns. Upon appointment of any successor Administrative Agent
under the Credit Agreement, all of the Rights of Administrative Agent under this
Guaranty automatically vest in that new Administrative Agent as successor
Administrative Agent on behalf of Lenders without any further act, deed,
conveyance, or other formality other than that appointment. The Rights of
Administrative Agent and Lenders under this Guaranty may be transferred with any
assignment of the Guaranteed Debt. The Credit Agreement contains provisions
governing assignments of the Guaranteed Debt and of Rights and obligations under
this Guaranty.

        21.     RESTATEMENT. The parties hereto agree that this Amended and
Restated Guaranty is intended to, and hereby does, restate, renew, amend,
modify, supercede, and replace the existing Guaranty in its entirety provided,
however that the execution and delivery of this Guaranty and the other Loan
Documents shall not in any circumstances be deemed to have terminated,
extinguished, or discharged the obligations and expenses under the existing
Guaranty other than as set forth herein.

                     REMAINDER OF PAGE INTENTIONALLY BLANK.
                          SIGNATURE PAGE(s) TO FOLLOW.

DIGEX A&R GUARANTY                                                      GUARANTY
                                       6
<PAGE>   7

        EXECUTED as of October 31, 2000.

                                       GUARANTOR:  DIGEX, INCORPORATED

Address:
               ---------------------

                                       By:       /s/ TIMOTHY M. ADAMS
                                              ---------------------------------
                                              Name:  Timothy M. Adams
                                                     --------------------------
Telephone:                                    Title: Chief Financial Officer
               ---------------------                 --------------------------
Facsimile:
               ---------------------

DIGEX A&R GUARANTY               GUARANTY SIGNATURE PAGE

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