Exhibit 10.20

# MEMORANDUM

|DATE: |  | June
1, 2005
|----- |  | ------------

|TO: |  | Sue
Horvath
|--- |  | -----------

|FROM: |  | Marti
Morfitt
|----- |  | -------------

This is intended to confirm your
recent promotion to Vice President & Team Leader, International reporting to me and
effective April 1, 2005. Your new base salary is $145,000 annualized, paid over regular
semi-monthly pay periods.

In the event your employment is
terminated by CNS without Cause (as defined on Exhibit A) prior to a change in control of
CNS, in exchange for a written release of all claims by you, CNS will pay you severance
equal to your annual base salary payable over a period of twelve months from your
termination date, subject to required withholding salary plus pay your COBRA premium over
the same period. In the event your employment is terminated by CNS without Cause or you
resign your employment with CNS for Good Reason (as defined on Exhibit A) within 24 months
after a change in control of CNS, in exchange for a written release of all claims by you,
CNS will pay you severance equal to two times your annual base salary payable over a
period of twenty-four months from your termination date, subject to required withholding
plus your COBRA premium payable over a period of 18 months from your termination date.

Sue, we are excited to have you take
on these new responsibilities. If you have any questions about the terms of this new
position, please see me or Nicole Strait. I know that this will be a challenging and
rewarding opportunity for you and that you will be an important part of delivering the CNS
vision!

Regards,

Marti Morfitt

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# EXHIBIT A

Cause shall mean one or
more of the following: (i) your willful failure or refusal to perform your expected
services to CNS consistent with your position; (ii) your commission of an
intentional breach of fiduciary duty against CNS or a substantial act of fraud against or
affecting CNS or any customer, supplier, client, agent, or executive thereof; (iii) your
commission of any other willful or reckless act which is deemed by CNSs Board to
have a material adverse effect on CNS (it being understood that mere negligence in
performance of duties is not Cause under this Agreement); (iv) your willful breach
of any provision of this Agreement or any policy or directive of the Board or the CEO,
including the CNS Code of Conduct; or (v) your commission of any act involving moral
turpitude which is deemed by CNSs Board to have a material adverse effect on CNS or
your position with CNS; or (vi) your unsatisfactory performance after specific
notice of performance deficiencies, description of expectations and opportunity to cure.

Good Reason shall mean:
(i) CNS has materially breached any of the terms of this Agreement; (ii) you are assigned
duties which are materially inconsistent with your position, duties, responsibilities and
status as Vice President of Human Resources; (iii) your base salary or bonus opportunity,
is reduced; or (iv) as a result of the relocation of CNS principal offices, you
would be required to relocate your principal residence outside reasonable commuting
distance of the Twin Cities Metropolitan area.

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