Document:

<PAGE>   1
EXHIBIT 10.28

November 3, 2000

Mr. Todd Carlson
1000 Blue Ridge Place
Richardson, TX   75080

Dear Todd:

On the behalf of Digex Incorporated, I am pleased to offer you the position of
Senior Vice President of Business Operations, reporting to Mark Shull, Chief
Executive Officer. This offer is a promotion to a full-time position.

COMPENSATION

Your annual base salary will be $250,000 (based on 52 weeks of service).
Salaries are reviewed annually, and increases are granted based on individual
performance during the year and in accordance with Company policy.

You will be eligible to participate in Digex's Executive Management Incentive
Compensation Plan. In this position, you will be eligible for a bonus of 50%
of your base salary. At 100% of objective achievement your total potential
cash compensation is $375,000.

The incentive will be 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
departmental management.

STOCKS

This offer includes a stock option grant increase covering an aggregate of
100,000 shares of Digex common stock contingent upon approval by the
Compensation Committee of the Board of Directors. You will be granted 87,500
shares at an exercised price equal to the market price of Digex Inc. common
stock on the date that the grant is approved and the remaining 12,500 shares
at an exercised price equal to $20.00 less than the market price referenced
above. Your total Digex, Inc. common stock options will now equal 200,000
shares.

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 option 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" as
defined in the stock option plan (attached), this grant will fully vest one
year following such change.

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

BENEFITS

As an employee of Digex you will be 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, Manager of Benefits at 240-264-2491.

<PAGE>   2

TODD CARLSON
page 2
November 3, 2000

TEMPORARY HOUSING/COMMUTING EXPENSES

This offer does not include relocation, however Digex will provide suitable
temporary housing and commuting expenses on an ongoing basis while employed at
Digex. It is understood that you will be located in Dallas, Texas.

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 your acceptance of this offer by signing and dating the
enclosed copy of this letter and returning it to me by November 10, 2000. If
we do not receive your acceptance of this offer by the close of business on
the above date, this offer will be withdrawn without further liability of
either party to the other.

If you have any questions or need additional information, please feel free to
call me 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

cc:      T. Adams
         D. Ruberg
         D. Gay

Encl.

/s/ TODD R. CARLSON                     11/7/100                  10/01/00
-----------------------------          ----------                -----------
Accepted: Todd Carlson                 Date:                     Start Date:

<PAGE>   3
November 3, 2000

Mr. Todd Carlson
1000 Blue Ridge Place
Richardson, TX   75080

Dear Todd:

This letter amends the offer letter that was sent to you on July 6, 2000.
Unfortunately, this letter contained incorrect information regarding the number
of stock options that were to be submitted to the Compensation Committee of the
Board of Directors for approval. This letter seeks to correct that
administrative error.

On the behalf of Digex Incorporated, I am pleased to offer you the position of
Senior Vice President of Business Operations, reporting to Mark Shull, Chief
Executive Officer. This is a regular part time position that will require you to
work in the Washington, DC area a minimum of 10 days per month.

COMPENSATION
Your annual base salary will be $125,000 (based on 52 weeks of service).
Salaries are reviewed annually, and increases are granted based on individual
performance during the year and in accordance with Company policy.

You will be eligible to participate in Digex's Executive Management Incentive
Compensation Plan. In this position, you will be eligible for a bonus of 50% of
your base salary. At 100% of objective achievement your total potential cash
compensation is $187,500.

The incentive will be 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
departmental management.

STOCKS
This offer includes a stock option grant covering an aggregate of 100,000 shares
of Digex common stock contingent upon approval by the Compensation Committee of
the Board of Directors. You will be granted 87,500 shares at an exercised price
equal to the market price of Digex Inc. common stock on the date that the grant
is approved and the remaining 12,500 shares at an exercised price equal to
$20.00 less than the market price referenced above.

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

BENEFITS
As an employee of Digex you will be 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, Manager of Benefits, 240-264-2491

<PAGE>   4

TODD CARLSON
page 2
November 3, 2000

TEMPORARY HOUSING/COMMUTING EXPENSES
This offer does not include relocation, however Digex will provide suitable
temporary housing and commuting expenses on an ongoing basis while employed at
Digex. It is understood that you will be located in Dallas, Texas. However you
are expected to work a minimum of ten (10) days per month in the Washington, DC
area.

This offer is contingent on the following:
-   Your acknowledgement and execution of our "Employee Agreement Regarding
    Intellectual Property and Proprietary Information", which will be reviewed
    and authorized by you and a company representative.

-   Proof that you are legally authorized to work in the United States per
    Immigration Reform Act of 1986 (see attachment A).

-   Completion of the enclosed employment application.

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 your acceptance of this offer by signing and dating the
enclosed copy of this letter and returning it to me by July 14, 2000. If we do
not receive your acceptance of this offer by the close of business on the above
date, this offer will be withdrawn without further liability of either party to
the other.

If you have any questions or need additional information, please feel free to
call me at (240) 264-4712 or fax at (240) 264-2666. I am looking forward to your
joining the Digex Executive Management Team and feel it will be a mutually
beneficial relationship. I wish you success in the continuation of your career
with Digex.

Sincerely yours,

/s/ MARK SHULL

Mark Shull
CEO, President

cc:     D. Gay
        D. Ruberg

/s/ TODD CARLSON                        11/7/00                  7/01/00

-----------------------------          ----------                -------------
Accepted: Todd Carlson                      Date:                Start Date:<PAGE>   1
EXHIBIT 10.37

October 26, 2000

Mr. Howard Weizmann
1524 Gordon Cove Drive
Annapolis, MD 21403

Dear Howard:

On the behalf of Digex Incorporated, I am pleased to offer you the position of
Vice President of Human Resources, reporting to Mark Shull, Chief Executive
Officer.

COMPENSATION

Your annual base salary will be $200,000 (based on 52 weeks of service).
Salaries are reviewed annually, and increases are granted based on individual
performance during the year and in accordance with Company policy.

You will be eligible to participate in Digex's Executive Management Incentive
Compensation Plan. In this position, you will be eligible for a bonus of 50%
of your base salary. At 100% of objective achievement your total potential
cash compensation is $300,000.

The incentive will be prorated on the base pay received during the current
fiscal calendar year. This incentive opportunity and is contingent upon the
achievement of corporate and individual objectives as determined by your
departmental management.

To facilitate your transition to Digex, our offer also includes a one time
Sign-on Bonus of $75,000. This bonus will be paid to you shortly after your
start date. The Sign-on Bonus creates a debt to Digex, Inc. which will be
forgiven over a 12 month period commencing on your date of hire. Voluntary
separation prior to the completion of these 12 months will create a debt to
the Company for the signing bonus expenses incurred that exceed the forgiven
amount.

STOCKS

This offer includes a stock option grant covering an aggregate of 100,000
shares of Digex common stock contingent upon approval by the Compensation
Committee of the Board of Directors. You will be granted 80,000 shares at an
exercised price equal to the market price of Digex Inc. common stock on the
date that the grant is approved and 20,000 options at $30 under market.

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 option 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.

<PAGE>   2

HOWARD WEIZMANN
Page 2
October 26, 2000

The Board of Directors will provide details in your Grant Agreement upon
approval. The option will be issued pursuant to the Company's long-term
Incentive Plan and will be subject to all the terms and conditions of that
plan.

SEVERANCE

Upon termination for reason other than "cause", you will be entitled to
receive the equivalent amount of your base pay and medical and dental benefits
for a 12-month period. Cause shall be defined as your (i) willful and
continued failure to substantially perform duties reasonably assigned
consistent with your position as Vice President of Human Resources (other than
any failures resulting from physical or mental illness or death); (ii)
continuing failure to perform or discharge the duties of Vice President of
Human Resources assigned to you by the Chief Executive Officer, if such
failure to perform or discharge your duties continues for a period of thirty
(30) days after written notice to you detailing such failure; or (iii)
conviction of a felony that adversely affects the business and/or reputation
of Digex. It is understood that this definition of Cause shall be applicable
to any "change of control" provisions as contained in the Stock Option
Agreement.

BENEFITS

As an employee of Digex you will be 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. Marilyn Garner, Senior Human Resources Generalist, 240-264-2391

HEALTHCARE

Digex Management will work with you to seek approval for a retiree health
plan. If the plan is approved then, upon separation from service after age 55
or if terminated for any reason other than cause as defined herein, you will
be entitled to continue in the company's medical plan at your own cost, unless
otherwise covered under (i) a medical plan adopted by Digex which supersedes
this coverage, or (ii) under another company's medical plan as a retiree.

VACATION

You are eligible to accrue one month of vacation per year.

This offer is contingent on the following:

-    Your acknowledgement and execution of our "Employee Agreement Regarding
     Intellectual Property and Proprietary Information", which will be
     reviewed and authorized by you and a company representative.

-    Proof that you are legally authorized to work in the United States per
     Immigration Reform Act of 1986 (see attachment A).

-    Completion of the enclosed employment application.

<PAGE>   3

HOWARD WEIZMANN
Page 3
October 26, 2000

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 your acceptance of this offer by signing and dating the
enclosed copy of this letter and returning it to me by October 27, 2000. If we
do not receive your acceptance of this offer by the close of business on the
above date, this offer will be withdrawn without further liability of either
party to the other.

If you have any questions or need additional information, please feel free to
call me at (240) 264-4712 or fax at (240) 264-2666. I am looking forward to
your joining the Digex Executive Management Team and feel it will be a
mutually beneficial relationship. I wish you success in the continuation of
your career with Digex.

Sincerely yours,

/s/ DAVID GAY for Mark Shull

Mark Shull
Chief Executive Officer

cc:      D. Ruberg
         D. Gay

Encl.

/s/ HOWARD WEIZMANN                     10/27/00                 11/20/00
-----------------------------          ----------               -----------
Accepted: Howard Weizmann              Date:                    Start Date:

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