UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549




                                 SCHEDULE 13D/A

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 3)*




                               Critical Path, Inc.
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                                (Name of Issuer)


                    Common Stock, par value $0.001 per share
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                         (Title of Class of Securities)

                                   22674V 10 0
                    ----------------------------------------
                                 (CUSIP Number)


                                Adam M. Fox, Esq.
                                   Dechert LLP
                              30 Rockefeller Plaza
                            New York, New York 10112
                                 (212) 698-3500
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           (Name, Address and Telephone Number of Person Authorized \
                     to Receive Notices and Communications)


                                 March 29, 2005
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             (Date of Event which Requires Filing of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of ss.ss. 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the
following box. [ ]

NOTE: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See ss. 240.13d-7 for other
parties to whom copies are to be sent.

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                     Page 1 of 7 sequentially numbered pages



                                  SCHEDULE 13D


----------------------------                                                                ---------------------------
CUSIP NO.  22674V 10 0                                                                               PAGE 2 OF 7 PAGES
---------- ------------------------------------------------------------------------------------------------------------

    1      NAME OF REPORTING PERSONS
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (entities only)

           PETER KELLNER
---------- ------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)                            (a) [ ]
                                                                                                          (b) [X]
---------- ------------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

---------- ------------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS (See Instructions)

           WC, PF
---------- ------------------------------------------------------------------------------------------------------------
    5      CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)                [ ]

---------- ------------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           UNITED STATES
--------------------------------- ------ ------------------------------------------------------------------------------
                                    7    SOLE VOTING POWER                   3,260,345

                                  ------ ------------------------------------------------------------------------------
                                    8    SHARED VOTING POWER                 0
        Number of Shares
     Beneficially Owned by        ------ ------------------------------------------------------------------------------
         Each Reporting             9    SOLE DISPOSITIVE POWER              3,260,345
          Person with
                                  ------ ------------------------------------------------------------------------------
                                   10    SHARED DISPOSITIVE POWER            0

--------------------------------- ------ ------------------------------------------------------------------------------
   11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                    3,260,345
---------- ------------------------------------------------------------------------------------------------------------
   12      CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions)               [ ]

---------- ------------------------------------------------------------------------------------------------------------
   13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                                     10.26%
---------- ------------------------------------------------------------------------------------------------------------
   14      TYPE OF REPORTING PERSON (See Instructions)
                                       IN
---------- ------------------------------------------------------------------------------------------------------------




                                  SCHEDULE 13D


----------------------------                                                                ---------------------------
CUSIP NO.  22674V 10 0                                                                               PAGE 3 OF 7 PAGES
---------- ------------------------------------------------------------------------------------------------------------

    1      NAME OF REPORTING PERSONS
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (entities only)

           RICHMOND I, LLC
---------- ------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)                            (a) [ ]
                                                                                                          (b) [X]
---------- ------------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

---------- ------------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS (See Instructions)

           WC
---------- ------------------------------------------------------------------------------------------------------------
    5      CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)                [ ]

---------- ------------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           DELAWARE
--------------------------------- ------ ------------------------------------------------------------------------------
                                    7    SOLE VOTING POWER                   696,056

                                  ------ ------------------------------------------------------------------------------
                                    8    SHARED VOTING POWER                 0
        Number of Shares
     Beneficially Owned by        ------ ------------------------------------------------------------------------------
         Each Reporting             9    SOLE DISPOSITIVE POWER              696,056
          Person with
                                  ------ ------------------------------------------------------------------------------
                                   10    SHARED DISPOSITIVE POWER            0

--------------------------------- -------------------------------------------------------------------------------------
   11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                     696,056
---------- ------------------------------------------------------------------------------------------------------------
   12      CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions)               [ ]

---------- ------------------------------------------------------------------------------------------------------------
   13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                                                                    2.34%
---------- ------------------------------------------------------------------------------------------------------------
   14      TYPE OF REPORTING PERSON (See Instructions)
                                       PN
---------- ------------------------------------------------------------------------------------------------------------


          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
       (INCLUDING EXHIBITS) OF THE SCHEDULE AND THE SIGNATURE ATTESTATION.



                                  SCHEDULE 13D


----------------------------                                                                ---------------------------
CUSIP NO.  22674V 10 0                                                                               PAGE 4 OF 7 PAGES
---------- ------------------------------------------------------------------------------------------------------------

    1      NAME OF REPORTING PERSONS
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (entities only)

           RICHMOND III, LLC
---------- ------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)                            (a) [ ]
                                                                                                          (b) [X]
---------- ------------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

---------- ------------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS (See Instructions)

           WC
---------- ------------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)            [ ]

---------- ------------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           DELAWARE
--------------------------------- ------ ------------------------------------------------------------------------------
                                    7    SOLE VOTING POWER                   1,988,086

                                  ------ ------------------------------------------------------------------------------
                                    8    SHARED VOTING POWER                 0
        Number of Shares
     Beneficially Owned by        ------ ------------------------------------------------------------------------------
         Each Reporting             9    SOLE DISPOSITIVE POWER              1,988,086
          Person with
                                  ------ ------------------------------------------------------------------------------
                                   10    SHARED DISPOSITIVE POWER            0

---------- ------------------------------------------------------------------------------------------------------------
   11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                    1,988,086
---------- ------------------------------------------------------------------------------------------------------------
   12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions)           [ ]

---------- ------------------------------------------------------------------------------------------------------------
   13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                                                                    6.26%
---------- ------------------------------------------------------------------------------------------------------------
   14      TYPE OF REPORTING PERSON (See Instructions)
                                       PN
---------- ------------------------------------------------------------------------------------------------------------


          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
       (INCLUDING EXHIBITS) OF THE SCHEDULE AND THE SIGNATURE ATTESTATION.


     This Amendment No. 3 to Schedule 13D (this "Amendment No. 2") should be
read in conjunction with the Schedule 13D filed with the Securities and Exchange
Commission on February 4, 2004 (the "Original Schedule 13D") by Peter Kellner
("Mr. Kellner") and Richmond I, LLC, a Delaware limited liability company
("Richmond I"), relating to the shares of common stock, par value $0.001 per
share, of Critical Path, Inc., a Delaware corporation (the "Company"), as
subsequently amended by Amendment No. 1/A and Amendment No. 2 thereto, each
filed with the Securities and Exchange Commission on December 12, 2006
("Amendment No. 1/A" and "Amendment No. 2," respectively) by Mr. Kellner,
Richmond I and Richmond III, LLC, a Delaware limited liability company
("Richmond III" and, collectively with Mr. Kellner and Richmond I, the
"Reporting Persons"). This Amendment No. 3 amends Items 5 and 7 of the Original
Schedule 13D, as amended by Amendment No. 1/A and Amendment No. 2, to report
purchases by the Reporting Persons that have not been previously reported.

ITEM 5. INTEREST IN SECURITIES OF THE ISSUER.
        -------------------------------------

     (a) and (b) Based on the Company's Annual Report on Form 10-K filed with
the Securities and Exchange Commission on March 31, 2005, there were 29,784,123
shares of Common Stock issued and outstanding as of March 1, 2005.

     Mr. Kellner beneficially owns 3,260,345 shares of Common Stock
individually, representing approximately 10.26% of the fully diluted outstanding
shares of Common Stock, of which 696,056 and 1,988,086 shares of Common Stock
are beneficially owned by Richmond I and Richmond III, respectively,
representing approximately 2.34% and 6.26%, respectively, of the fully diluted
outstanding shares of Common Stock. Of the amount of shares of Common Stock
beneficially owned by Richmond III, 321,420 are issuable upon conversion of
shares of Series F preferred stock of the Company issuable upon currently
exercisable warrants and 1,666,666 are issuable upon conversion of shares of
Series E convertible preferred stock of the Company (which, for reporting
purposes, excludes any shares of Common Stock issuable upon conversion of Series
E convertible preferred stock or Series F redeemable convertible preferred stock
attributable to the accretion of dividends on such shares of Series E
convertible preferred stock or Series F redeemable convertible preferred stock).
The Reporting Persons have sole voting and dispositive power with respect to
such shares.

     (c) On March 29, 2005, Richmond III acquired 10,714 warrants, initially
exercisable to acquire 107,140 shares of Series F redeemable convertible
preferred stock of the Company at a conversion price of $14.00 per share. The
shares of Series F redeemable convertible preferred stock underlying such
warrants are convertible into shares of Common Stock of the Company. Except for
the transactions described herein and in Amendment No. 1/A, there have been no
other transactions in the securities of the Company effected by the Reporting
Persons in the past 60 days from March 29, 2005.

ITEM 7. MATERIAL TO BE FILED AS EXHIBITS.
        ---------------------------------

Exhibit A   Agreement of Joint Filing, dated December 11, 2006, by and among
            Peter Kellner, Richmond I, LLC and Richmond III, LLC



                                    SIGNATURE

     After reasonable inquiry and to the best of its knowledge and belief, the
undersigned certify that the information set forth in this Statement is true,
complete and correct.


------------------------------------------ -------------------------------------
Dated:  December 11, 2006

                                           /s/ Peter B. Kellner
                                           --------------------
                                           PETER KELLNER


------------------------------------------ -------------------------------------
                                           RICHMOND I, LLC


                                           By: /s/ Peter B. Kellner
                                              ---------------------------------
                                               Peter Kellner, Managing Director


------------------------------------------ -------------------------------------
                                           RICHMOND III, LLC


                                           By: /s/ Peter B. Kellner
                                              ---------------------------------
                                               Peter Kellner, Managing Director



------------------------------------------ -------------------------------------



                                    EXHIBIT A


                            AGREEMENT OF JOINT FILING



     In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934,
as amended, the undersigned hereby agree to the joint filing with all other
persons signatory below of a statement on Schedule 13D or any amendments
thereto, with respect to the common stock of Critical Path, Inc., and that this
Agreement be included as an attachment to such filing.

     This Agreement may be executed in any number of counterparts each of which
shall be deemed an original and all of which together shall be deemed to
constitute one and the same Agreement.

     IN WITNESS WHEREOF, the undersigned hereby execute this Agreement on the
11th day of December 2006.


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                                           /s/ Peter B. Kellner
                                           --------------------
                                           PETER KELLNER


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                                           RICHMOND I, LLC


                                           By: /s/ Peter B. Kellner
                                              --------------------------------
                                              Peter Kellner, Managing Director


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                                           RICHMOND III, LLC


                                           By: /s/ Peter B. Kellner
                                              --------------------------------
                                              Peter Kellner, Managing Director


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