Document:

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                                                                   EXHIBIT 10.16

                                            Michael Mansouri
                                            President and CEO
                                            iPass Inc.
                                            650 Castro Street, Suite 500
                                            Mountain View, CA 94041

August 19, 1999

Chris Moore
850 Center Drive
Palo Alto, CA 94301

Dear Chris:

        This letter is to confirm your ending full-time employment with the
Company and beginning the previously agreed severance.

        1. SEPARATION. Your last day of employment with the Company will be
August 1, 1999 (the "Separation Date"). The Company will pay you all accrued
salary and incentive compensation and all accrued and unused vacation earned
through the Separation Date. In addition, you will receive severance
compensation (as stated and limited in Exhibit A). For a period of no more than
one year, the Company will continue to provide you use of voice-mail, e-mail, a
computer as well as health coverage until such time that you become covered by
another plan.

        2. INDEMNIFICATION. In the event you are made, or threatened to be made,
a party to any legal action or proceeding, whether civil or criminal, by reason
of the fact that you were a director or officer of the Company, you shall be
indemnified by the Company, and the Company shall pay your related expenses when
and as incurred, all to the fullest extent permitted by law and in accordance
with the Company's Amended and Restated Bylaws.

                                   Sincerely,

                                   IPASS INC.

                                   By: /s/ Michael Mansouri
                                       -----------------------------------
                                       MICHAEL MANSOURI
                                       Chief Executive Officer

UNDERSTOOD AND AGREED:

/s/ Christopher Moore
-----------------------------------
CHRIS MOORE

                                  CONFIDENTIAL

<PAGE>   2

                                    EXHIBIT A

                              TERMINATION BENEFITS

        Upon execution by you ("Executive") of an effective release of claims as
attached as Exhibit B, the Company shall provide Executive with termination
benefits upon termination of employment, as follows:

        An amount equal to one year's base salary and target bonus at the time
of termination shall be paid by the Company in twelve equal monthly installments
following termination of employment. All such amounts shall be paid by the
Company as soon as administratively possible at or following the time such
amount becomes due and payable and following the first point in time that the
Company is entitled to deduct such payments for income tax purposes in
compliance with applicable law, including but not limited to the provisions of
Section 162(m) of the Internal Revenue Code of 1986, as amended (the "Code").
All of the unvested shares subject to option held by Executive on the date of
such termination that would have vested over the succeeding twelve month period
shall vest on the dates on which such shares would have become vested had
Executive remained employed with the Company for such twelve month period. The
options shall remain exercisable for the period specified in such options
following Executive's termination of employment.

        In addition, the Company's obligation to provide any further benefits
under Section 4.1 shall immediately cease in the event that Executive either (a)
violates the terms of the Company's standard form of Employee Confidentiality
and Assignment of Inventions Agreement signed by Executive or (b) competes with
the Company during the term of his employment or within twelve (12) months
following termination of employment. For purpose of this Agreement, Executive
"competes" with the Company if he engages in (whether as an employee,
consultant, proprietor, partner, director or otherwise), or has any ownership
interest in, or participates in the financing, operation, management or control
of, any person, firm, corporation or business which sells products or services
which directly compete with the products or services either offered by the
Company at the time or at the termination of Executive's employment were, and at
that time are, are being developed for offering by the Company (a "Competing
Company'). In the event that the Competing Company has one or more lines of
business which do not compete with the Company, Executive will not be in
violation of this provision if he is involved only with the line or lines of
business which do not compete with the Company and he has no managerial or
ownership control over any competing line of business. It is agreed that
ownership of no more than 2% of the outstanding voting stock of a publicly
traded corporation shall not constitute a violation of this provision.

                                  CONFIDENTIAL

                                                                               3
<PAGE>   3

                                    EXHIBIT B

                                     RELEASE

        Certain capitalized terms used in this Release are defined in the
Separation Agreement to which this Exhibit is attached and which I have
reviewed.

        I acknowledge that I have read and understand Section 1542 of the
California Civil Code which reads as follows: "A GENERAL RELEASE DOES NOT EXTEND
TO CLAIMS WHICH THE CREDITOR DOES NOT KNOW OR SUSPECT TO EXIST IN HIS FAVOR AT
THE TIME OF EXECUTING THE RELEASE, WHICH IF KNOWN BY HIM MUST HAVE MATERIALLY
AFFECTED HIS SETTLEMENT WITH THE DEBTOR." I hereby expressly waive and
relinquish all rights and benefits under that section and any law of any
jurisdiction of similar effect with respect to my release of any claims I may
have against the Company.

        Except as otherwise set forth in this Release, I hereby release, acquit
and forever discharge the Company, its parents and subsidiaries, and their
officers, directors, agents, servants, employees, shareholders, successors,
assigns and affiliates, of and from any and all claims, liabilities, demands,
causes of action, costs, expenses, attorneys fees, damages, indemnities and
obligations of every kind and nature, in law, equity, or otherwise, known and
unknown, suspected and unsuspected, disclosed and undisclosed, arising out of or
in any way related to claims and demands directly or indirectly arising out of
my employment with the Company or the termination of that employment, including
but not limited to, claims of intentional and negligent infliction of emotional
distress, any and all tort claims for personal injury, claims or demands related
to salary, bonuses, commissions, or any other ownership interests in the
Company, vacation pay, fringe benefits, expense reimbursements, severance pay,
or any other form of disputed compensation; claims pursuant to any federal,
state or local law or cause of action including, but not limited to, the federal
Civil Rights Act of 1964, as amended; the federal Age Discrimination in
Employment Act of 1967, as amended ("ADEA"); the federal Employee Retirement
Income Security Act of 1974, as amended; the federal Americans with Disabilities
Act of 1990; the California Fair Employment and Housing Act, as amended; tort
law; contract law; statutory law; common law; wrongful discharge;
discrimination; fraud; defamation; and breach of the implied covenant of good
faith and fair dealing; provided, however, that nothing in this paragraph shall
be construed in any way to release the Company from its obligation to indemnify
me from any third party action brought against me based on my employment with
the Company, pursuant to any applicable agreement or applicable law, or to
reduce or eliminate any coverage I may have under the Company's director and
officer liability policy, if any, or to release the Company from any obligations
which it has to pay termination benefits upon certain types of termination of my
employment with the Company as set forth and determined in the Executive
Employment Agreement.

        I acknowledge that I am knowingly and voluntarily waiving and releasing
any rights I may have under ADEA. I also acknowledge that the consideration
given under

                                  CONFIDENTIAL

                                                                               4
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the Agreement for the waiver and release in the preceding paragraph hereof is in
addition to anything of value to which I was already entitled. I further
acknowledge that I have been advised by this writing, as required by the ADEA,
that: (A) my waiver and release do not apply to any rights or claims that may
arise on or after the date I execute this Release; (B) I should consult with an
attorney prior to executing this Release; (C) I have twenty-one (21) days to
consider this Release (although I may choose to voluntarily execute this Release
earlier); (D) I have seven (7) days following the execution of this Release to
revoke this Release; and (E) this Release shall not be effective until the date
upon which the revocation period has expired, which shall be the eighth day
after this Release is executed by me.

                                            CHRISTOPHER W. MOORE

Date:                                       /s/ Christopher W. Moore
     -------------                          ---------------------------------

                                  CONFIDENTIAL

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[IPASS LETTERHEAD]

August 19, 1999

Chris Moore
850 Center Drive
Palo Alto, CA 94301

Dear Chris:

     This letter is to clarify the consulting arrangement we have previously
discussed:

     1.   CONSULTING. The Company will engage you as a consultant under the
following terms.

          a.   CONSULTING PERIOD. The consulting relationship commences on
September 1, 1999 and ends on January 1, 2000 (the "Consulting Period"). This
agreement may be continued by mutual agreement between you and the Company's
CEO ("CEO").

          b.   CONSULTING DUTIES. You will make yourself available to provide
consulting services to accomplish goals mutually agreed by yourself and the
CEO. Duties shall be to support the completion of the following goals:

               (i)  By December 1, 1999:

                    - Complete acquisition of the HomeGate patent (40%).

                    - Oversight of Jay Farhat's completion of his MBOs
                      (20%)

                    - Continued support in the completion of the Series E
                      financing (40%).

               (ii) By January 1, 2000 goals as mutually agreed with the CEO.

          c.   CONSULTING FEES. During the Consulting Period as noted in (i),
the Company will pay you $68,750 (one quarter of your base and incentive pay),
and for the consulting period as noted in (ii) above, at an hourly rate
equivalent to your base and incentive pay. The Company will not withhold or
make payments for taxes, social security, or other payroll deductions, make
unemployment insurance or disability insurance contributions, or obtain
worker's compensation insurance on your behalf. The Company will issue an IRS
1099-MISC form with respect to the Consulting Fees. You acknowledge that you
are an independent contractor and not an employee of the Company. You agree to
accept exclusive liability for complying with all applicable state and federal
laws governing self-employed individuals, including obligations such as payment
of taxes, social security, disability and other contributions based on fees
paid to Contractor. You hereby agree to indemnify the Company and hold it
harmless from any liability for any taxes, contributions,

                                  CONFIDENTIAL
<PAGE>   6
penalties, and interest that may be assessed by any taxing or governmental
authority with respect to the Consulting Fees.

          d.  Other Work Activities. During the Consulting Period, you may
engage in employment, consulting or other work relationships in addition to
your consulting for the Company. The Company agrees to make reasonable
arrangements to enable you to perform your work for the Company at such times
and in such a manner so that it does not interfere with other work activities
in which you may engage.

          e. Confidentiality and Work Product. During the Consulting Period and
afterwards, you will keep all of the Company's confidential and proprietary
information in confidence in accordance with the confidentiality provisions of
the Employee Confidentiality and Assignment of Inventions Agreement between you
and the Company [a copy of which is attached to this letter]. All of the work
product that you create during the Consulting Period will be the exclusive
property of the Company unless you and the Company otherwise agree in writing,
and you hereby assign all right, title and interest in such work product
(including all intellectual property rights) to the Company.

     2.   EXPENSE REIMBURSEMENTS. During the Consulting Period, upon your
provision of proper documentation, the Company will reimburse you for reasonable
expenses pre-approved by the Company and incurred by you in performing
consulting services at the Company's request. Recognizing that you have agreed
to perform consulting services from your home office, the following expenses
shall be considered pre-approved: costs of mobile and home-office telephone
service and internet access services from your home office.

                                                  Sincerely,

                                                  iPass Inc.

                                             By:  /s/ MICHAEL MANSOURI
                                                  -----------------------------
                                                  MICHAEL MANSOURI
                                                  Chief Executive Officer

Undersigned and Agreed:
/s/ CHRISTOPHER MOORE
------------------------------------
Chris Moore

Date:______________________________

                                  CONFIDENTIAL<PAGE>   1
                                                                   EXHIBIT 10.17

[INSERT date]

NAME
STREET ADDRESS
CITY, STATE ZIP

Dear [INSERT name],

I am pleased to offer you the position of [INSERT title] at iPass Inc. Your base
salary will be [INSERT semi-monthly salary] semi-monthly, plus benefits,
including the option of participating in our 401(k) Plan. If annualized, this
amount equals [INSERT annualized salary]. [INSERT this sentence if adding annual
bonus: "In addition, there will be an annual bonus of $?, paid on a quarterly
basis upon successful completion of quarterly objectives".] [INSERT this
sentence if adding a sign-on bonus: "In addition, there is a sign on bonus of $?
that is reimbursable to iPass if you leave within the first year".] [In
addition, you shall receive a lump-sum payment of $X (minus the appropriate
taxes) to assist with relocation expenses.]

Pending the approval of the Board of Directors of iPass, you will receive
options to purchase [INSERT number of shares] shares of iPass' common stock,
subject to a four-year vesting schedule and other restrictions, as described in
the employee shareholder documents you will receive. To offer you potential
substantial tax savings and maximum flexibility in tax planning, you may elect
to exercise your unvested options provided that they remain subject to
repurchase by the company. The company will provide a loan to cover the exercise
costs at the minimum legally required interest rate.

Also, in the event that the company undergoes a change of control and you are
subsequently terminated, other than for cause, or leave for "Good Reason" as
defined in the attachment to this letter, within 12 months of the change of
control, the vesting of the above stock options shall be accelerated by 24
months from the change of control. All acceleration shall be subject to the 280G
provisions attached to this letter.

iPass offers its employees health, dental, vision, life, AD&D, and short term
and long term disability insurance. The health & dental plans provide you with
several options regarding your care. Please read the enclosed information about
the options available to you. You may call Levie Tarantino with any questions
about health insurance or any other iPass benefits (650-318-0428).

If you accept this offer, the terms described in this letter shall be the terms
of your employment. Any additions or modifications of these terms must be in
writing and signed by yourself and the Chairman of iPass. Your employment
pursuant to this offer is contingent on you executing the enclosed Proprietary
Information and Inventions Agreement, the Employment Agreement, and upon you
providing iPass with the legally required proof of your identity and
authorization to work in the United States.
<PAGE>   2

Employment with iPass is at the will of each party and is not for a specific
term and can be terminated by you or by the company at any time for any reason,
with or without cause. Any contrary representations which may have been made or
which may be made to you are superseded by this offer. This offer is valid until
[INSERT day, month] at 5:00 pm. Please signify your acceptance by signing and
dating below and returning this offer letter to Levie Tarantino or myself. This
offer can be faxed to (650) 237-7322.

[INSERT name], your acceptance of our offer represents a unique opportunity for
us both to grow and succeed. We all want to thank you in advance for your faith
in us, and for the commitment you have made to our common vision. Finally, we
all look forward to working and building iPass with you!

<TABLE>
<S>                                         <C>
Welcome aboard,                             Accepted

--------------------------------            --------------------------------
Michael H. Mansouri, Chairman & CEO         [INSERT name]

--------------------------------            -----------------     --------------
[INSERT hiring manager name, title]         Date                  Start Date 0/0/00
</TABLE>

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