Exhibit
10.1

December  20,
2006

David Kenny
2 Stonefield
Lane
Wellesley, MA 02482

Dear
David,

This letter agreement (this
‘‘Agreement’’) memorializes
our discussions and agreement concerning your continued role with
Digitas Inc. (the
‘‘Company’’) and its
subsidiaries following the acquisition of the Company by Publicis
Groupe S.A. (‘‘Publicis’’)
pursuant to the Agreement and Plan of Merger, dated December
20,  2006, by and among the Company, Publicis, and Publicis
Acquisition Corp., a wholly-owned subsidiary of Publicis (the
‘‘Merger Agreement’’) (all
capitalized terms not defined herein shall have the meanings ascribed
to them in the Merger Agreement).

1.    Retention
Bonus. In consideration of your continued employment and your
agreement to the terms set forth below, you will be eligible for a
special retention bonus of $1,942,188.00 (the
‘‘Retention Bonus’’). The
Retention Bonus shall be payable in three equal installments on each of
the first three anniversaries of the Acceptance Date (as defined in the
Merger Agreement), provided, in each case, that you have remained
continuously employed by the Company and its subsidiaries through the
applicable payment date.

2.     Employment
Agreement. The Employment Agreement dated January  6,
1999, between you and the Company, as amended (including the Amendment
to Employment Agreement dated as of December  20,  2006)
(the ‘‘Employment
Agreement’’) will remain in force and effect, and
the Company acknowledges that the Acceptance Date will constitute a
Change of Control for purposes of the Employment Agreement.
Notwithstanding the foregoing, you and we agree as
follows:

•    Good Reason. Section
4(c)(i) of the Employment Agreement is amended to provide that you
shall be eligible to terminate employment pursuant to such clause only
(1) pursuant to the relocation trigger of such clause or (2) if,
without your consent, and after a failure by the Company adequately to
cure within 10 business days of receipt of written notice from you,
either (a) your base pay is reduced, (b) your bonus opportunity is
materially diminished, or (c) your title or position is materially
diminished, it being understood and agreed that any change to your
title or position as a result of the Company no longer being publicly
traded or becoming a subsidiary as a result of the transactions
contemplated by the Merger Agreement or as a result of changes to the
organizational structure of the Company and its subsidiaries as part of
the integration with Publicis shall not give you the right to terminate
employment pursuant to such Section 4(c)(i) unless such change involves
(i) your not retaining the position of CEO of the Company, serving on
the ‘‘P12’’ of Publicis Groupe, or
reporting directly to the Chairman of the Management Committee of
Publicis Groupe, or (ii) your not being responsible for the interactive
and digital strategy of Publicis
Groupe.

•    Severance Amount.
Section 4 of the Employment Agreement is amended to provide that in the
event that your employment terminates under circumstances entitling you
to severance benefits under Section 4 of the Employment Agreement, you
shall, in lieu of receiving the cash severance provided for by Section
4(d)(i) of the Employment Agreement, receive (notwithstanding your
termination of employment) any unpaid installments of the Retention
Bonus in a single lump sum immediately upon your
termination.

•    Term. Section 2 of
the Employment Agreement is amended to provide that the
‘‘Employment Period’’ (as defined therein)
shall terminate on the third anniversary of the Acceptance Date
(subject to its automatic termination upon any earlier termination of
your employment).

Notwithstanding the foregoing, the
Company, Publicis and you agree to cooperate in good faith to enter
into a new employment agreement that will take effect upon the
Acceptance Date and supersede the Employment Agreement at such time,
which new agreement will (1) provide for a 










three-year term of employment commencing on
the Acceptance Date, (2) provide that you will continue as CEO of the
Company, serve on the ‘‘P12’’ of Publicis
Groupe, and report directly to the Chairman of the Management Committee
of Publicis Groupe, (3) provide that you will be responsible for the
interactive and digital strategy of Publicis Groupe, (4) provide for
compensation and employee benefit terms that are (in the aggregate) at
least as favorable to you as the terms under which you currently
receive compensation and benefits, and (5) incorporate the terms set
forth herein with respect to the Retention Bonus, Good Reason,
severance, and Parent Shares (as defined below).

3.    Digitas Stock Options. Pursuant to the Merger
Agreement, your outstanding stock options to purchase Company common
shares will at the Effective Time be converted into stock options to
purchase shares of Parent Common Stock (as defined in the Merger
Agreement) (the ‘‘Parent
Shares’’). You hereby agree that you will not,
without the prior written consent of Parent, (1) exercise more than a
total of 400,000 stock options to purchase Company common shares
between the date hereof and the Effective Time, unless the term of
exercise will otherwise expire prior to the Effective Time, (2) sell,
transfer, or otherwise dispose of any Parent Shares prior to the
six-month anniversary of the Effective Time, (3) sell, transfer, or
otherwise dispose of more than an aggregate of 25% of the Parent
Shares prior to the first anniversary of the Effective Time, (4) sell,
transfer, or otherwise dispose of more than an aggregate of 50%
of the Parent Shares prior to the 18-month anniversary of the Effective
Time, or (5) sell, transfer, or otherwise dispose of more than an
aggregate of 75% of the Parent Shares prior to the second
anniversary of the Effective Time (it being understood that the number
of Parent Shares shall be equitably adjusted in the event of a change
in capitalization subsequent to the Acceptance Date affecting Parent
Common Stock). Following the second anniversary of the Effective Time,
you shall no longer be subject to any holding requirements in respect
of the Parent Shares (subject to applicable law). Notwithstanding the
foregoing, all restrictions set forth in this paragraph shall
automatically expire (a) upon your death or (b) in the event your
employment ends as the result of your Disability, a termination by the
Company Without Cause, or your resignation for Good Reason (as such
terms are defined in the Employment Agreement or the superseding
employment agreement contemplated in Section 2
above).

4.    Digitas Restricted Stock. Any
restrictions and conditions on all shares of Restricted Stock granted
to you on April  1,  2005 and April  3,  2006
under the Digitas Inc. 2000 Stock Option and Incentive Plan will lapse
upon the Acceptance Date and all such shares shall be fully vested and
no longer deemed Restricted Stock as of that
date.

5.    Termination of Merger Agreement. In the
event that the Merger Agreement is terminated prior to the occurrence
of an Acceptance Date, this Agreement shall become null and void and of
no effect.

6.    Miscellaneous. This Agreement
shall constitute a valid amendment of the Employment Agreement, and
shall be governed by the same dispute resolution provisions as the
Employment Agreement. Any payments made pursuant to this Agreement
shall be subject to applicable tax withholding. This Agreement may not
be amended or modified other than by a written agreement executed by
you, the Company, and Publicis (or your and their respective successors
and legal representatives).

Please indicate your agreement with
the foregoing by signing
below.


		Sincerely,





		/s/ Brian
K. Roberts





		Digitas Inc.





		/s/
Maurice Lévy    





		Publicis Groupe
S.A.




Acknowledged and Agreed:


/s/
David W. Kenny