<PAGE>   1
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                   FORM 10-K/A
                                 AMENDMENT NO. 1

(MARK ONE)

     [X]     ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES
             EXCHANGE ACT OF 1934

                  FOR THE FISCAL YEAR ENDED: DECEMBER 31, 2000

                                       OR

     [ ]     TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES
             EXCHANGE ACT OF 1934

                    FOR THE TRANSITION PERIOD FROM    TO    .

                        COMMISSION FILE NUMBER: 000-25331

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

                               CRITICAL PATH, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

                    CALIFORNIA                           911788300
         (STATE OR OTHER JURISDICTION OF              (I.R.S. EMPLOYER
          INCORPORATION OR ORGANIZATION)           IDENTIFICATION NUMBER)

                 532 FOLSOM STREET,                        94105
             SAN FRANCISCO, CALIFORNIA                   (ZIP CODE)
     (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)


       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (415) 808-8800

        SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT: NONE

    SECURITIES REGISTERED PURSUANT TO SECTION 12(G) OF THE ACT: COMMON STOCK
                                (TITLE OF CLASS)

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

    Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes [X] No [ ]

    Indicate by check mark if disclosure of delinquent filers pursuant to item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [ ]

    The aggregate market value of voting stock held by non-affiliates of the
Registrant was approximately $153,619,078 as of March 15, 2001, based on the
closing price of the Common Stock as reported on The Nasdaq Stock Market for
that date. There were 74,294,434 shares of the Registrant's Common Stock issued
and outstanding on March 15, 2001.

================================================================================


<PAGE>   2


                               CRITICAL PATH, INC.

                                EXPLANATORY NOTE

         This amendment to the Company's Annual Report on Form 10-K for the
year ended December 31, 2000 reflects the addition of the information required
by Part III of the report. We have made no further changes to the previously
filed Form 10-K.


                                      INDEX

                                    PART III

<TABLE>
<CAPTION>
<S>         <C>                                                                             <C>
                                                                                            Page

Item 10.    Directors and Executive Officers of the Registrant ...........................   3

Item 11.    Executive Compensation........................................................   3

Item 12.    Security Ownership of Certain Beneficial Owners and Management ...............   9

Item 13.    Certain Relationships and Related Party Transactions..........................  10
</TABLE>
<PAGE>   3
                                    PART III


ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

         Section 16(a) of the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), requires the Company's directors, executive officers and
holders of more than 10% of the Company's Common Stock to file with the
Securities and Exchange Commission (the "SEC") initial reports of ownership and
reports of changes in ownership of Common Stock and other equity securities of
the Company. The Company believes that during the fiscal year ended December
31, 2000, its officers, directors and holders of more than 10% of the Company's
Common Stock complied with all Section 16(a) filing requirements with the
exception of the following late filings: (a) Mr. Hayden, Executive Chairman of
the Board, inadvertently failed to file in a timely manner: (i) Form 4s for the
months of May, July, August, October, November and December in 2000 to report
an aggregate of nineteen transactions, and (ii) a Form 5 for fiscal 2000 to
report one transaction; and (b) to the Company's knowledge, Mr. Rinehart, the
Company's former Vice President of Worldwide Sales, has failed to file in a
timely manner a Form 5 for fiscal 2000 to report one transaction. In making
this statement, the Company has relied upon the written representations of its
directors and officers.

ADDITIONAL INFORMATION

         Additional information required by this item is contained in the
Company's Annual Report on Form 10-K for the year ended December 31, 2000,
filed with the Securities and Exchange Commission on May 5, 2001.

ITEM 11. EXECUTIVE COMPENSATION

         The following table summarizes all compensation earned by or paid to
the Named Executive Officers (as defined in Item 13 below) for services rendered
in all capacities to Critical Path during the fiscal years ended December 31,
2000, 1999 and 1998.

           SUMMARY COMPENSATION TABLE FOR THE LAST THREE FISCAL YEARS


<TABLE>
<CAPTION>

                                                                                                                         Long-Term
                                                                                                                        Compensation
                                                                                                                           Awards
                                                                                  Annual Compensation                     Security
                                                                     ---------------------------------------------       Underlying
            Name and Principal Position                Fiscal Year       Salary          Bonus (1)        Other         Options (#)
                                                      ------------   --------------    ------------   ------------      -----------
<S>      <C>                                          <C>            <C>               <C>            <C>               <C>
         David C. Hayden (2)............................. 2000       $   124,455       $   200,000             --              --
           Executive Chairman of the Board of             1999           222,157                --             --              --
           Directors                                      1998           170,833           135,000             --       1,364,482

         Douglas T. Hickey (3) .......................... 2000           350,000           250,000        $61,281 (4)          --
           Former Chief Executive Officer                 1999           332,373                --         52,908 (5)          --
                                                          1998            51,136                --          8,818 (6)   2,549,374

         William H. Rinehart (7) ........................ 2000           194,000            25,000             --              --
           Former Vice President of Worldwide Sales       1999           185,000                --             --              --
                                                          1998            19,621                --             --         454,545

         Mark J. Rubash (8) ............................. 2000           180,888           250,000 (9)         --         475,000
           Former Executive Vice President and            1999                --                --             --              --
           Chief Financial Officer                        1998                --                --             --              --

         Mari E. Tangredi (10) .......................... 2000           185,000            60,000             --              --
           Former Executive Vice President of             1999           140,000                --             --              --
           Business Development, Sales and                1998           108,055            65,000             --         431,816
           Professional Services

         David A. Thatcher (11) ......................... 2000           309,000           185,000             --              --
           Former President                               1999           185,000                --             --              --
                                                          1998             9,110                --             --         848,836

         Cynthia Diana Whitehead (12) ................... 2000           185,000            30,000             --         100,000
           Former President                               1999           126,614            43,215             --         230,000
                                                          1998                --                --             --              --

</TABLE>

----------

(1) The Company paid discretionary bonuses to certain of its officers in the
    first half of fiscal 2000.

(2) Mr. Hayden served as the Company's Chairman, President, Chief Executive
    Officer and Secretary from its inception in February 1997 to October 1998,
    and as its Chairman of the Board of Directors and an employee from October
    1998 to July 2000. Mr. Hayden ceased to be an employee of the Company in
    July 2000, but continued as Chairman of the Board of Directors until his
    appointment as Executive Chairman of the Board in February 2001. Mr. Hayden
    was not compensated for his service as Chairman of the Board of Directors
    after he ceased to be an employee.

(3) Mr. Hickey served as Chief Executive Officer of the Company from October
    1998 until his resignation in February 2001, and was also its President from
    October 1998 through January 2000.



<PAGE>   4

(4)  Includes $38,400 paid to Mr. Hickey for use of a corporate apartment,
     $10,881 for use of a corporate automobile and $12,000 for investment
     advisory fees.

(5)  Includes $38, 400 paid to Mr. Hickey for use of a corporate apartment and
     $14,508 for use of a corporate automobile.

(6)  Includes $6,400 paid to Mr. Hickey for use of a corporate apartment and
     $2,418 for use of a corporate automobile.

(7)  Mr. Rinehart commenced his employment with the Company in November 1998 and
     served as the Company's Vice President of Worldwide Sales upon his
     separation from the Company in February 2001.

(8)  Mr. Rubash served as the Company's Executive Vice President and Chief
     Financial Officer from January 2000 until his resignation in December 2000.

(9)  Mr. Rubash received a bonus payment of $250,000 in connection with the
     settlement agreement and mutual release he entered into with the Company in
     December 2000.

(10) Ms. Tangredi commenced her employment with the Company in February 1998 and
     served as its Executive Vice President of Business Development, Sales and
     Professional Services at the time of her termination in April 2001.

(11) Mr. Thatcher served as the Company's Executive Vice President, Chief
     Financial Officer and Secretary from December 1998 to January 2000, and as
     its President and Secretary from January 2000 until his separation from the
     Company in February 2001.

(12) Ms. Whitehead commenced her employment with the Company in March 1999 and
     served as its President at the time of her termination in April 2001.


                        OPTION GRANTS IN FISCAL YEAR 2000

<TABLE>
<CAPTION>
                                                                                                     POTENTIAL REALIZABLE VALUE
                                                      PERCENTAGE OF                                    AT ASSUMED ANNUAL RATES
                                                      TOTAL OPTIONS                                  OF STOCK PRICE APPRECIATION
                                                        GRANTED TO     EXERCISE FOR                     FOR OPTION TERMS(3)(4)
                                         OPTIONS       EMPLOYEES IN    BASE PRICE     EXPIRATION   -------------------------------
    NAME                                 GRANTED (1)     2000 (2)      ($/SHARE)(3)      DATE             5%              10%
    ----                                ------------  ---------------  ------------  ------------  ---------------  --------------
<S> <C>                                 <C>           <C>              <C>           <C>           <C>            <C>
    David C. Hayden...................          --               --            --            --               --              --
    Douglas T. Hickey.................          --               --            --            --               --              --
    William H. Rinehart...............          --               --            --            --               --              --
    Mark J. Rubash....................     475,000             2.60%    $ 66.6875      01/18/04     $ 19,921,220    $ 50,484,283
    Mari E. Tangredi..................          --               --            --            --               --              --
    David A. Thatcher.................          --               --            --            --               --              --
    Cynthia Diana Whitehead...........     100,000             0.05%    $   50.50      01/01/04     $  3,175,918    $  8,048,399

</TABLE>

----------

(1)  These non-qualified stock options had a ten-year term, vested ratably on a
     monthly basis, and were to become fully vested on the fourth anniversary of
     the vest start date, but were each terminated due to the
     resignation or termination of the officer's employment with the Company.

(2)  Based on options to purchase an aggregate of 18,292,397 shares of Common
     Stock granted during fiscal 2000.

(3)  The exercise price was equal to the closing price of the Company's Common
     Stock on Nasdaq, on the date of grant.

(4)  The 5% and 10% assumed rates of appreciation are mandated by the rules of
     the Securities and Exchange Commission and do not represent Critical Path's
     estimate or projection of the future common stock price. There can be no
     assurance that any of the values reflected in the table will be achieved.

<PAGE>   5


                          FISCAL YEAR END OPTION VALUES

    The following table provides summary information concerning stock options
held as of December 31, 2000 by each of the Named Executive Officers. Six of the
Named Executive Officers exercised options in 2000.

                AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR
                       AND FISCAL YEAR-END OPTION VALUES

<TABLE>
<CAPTION>

                                                                                     NUMBER OF               VALUE OF UNEXERCISED
                                                                                UNEXERCISED OPTIONS        IN-THE-MONEY OPTIONS AT
                                              SHARES                             AT FISCAL YEAR-END           FISCAL YEAR-END (2)
                                             ACQUIRED          VALUE         --------------------------  --------------------------
NAME                                        ON EXERCISE      REALIZED (1)    EXERCISABLE  UNEXERCISABLE  EXERCISABLE  UNEXERCISABLE
----                                       ------------  ------------------  -----------  -------------  -----------  -------------
<S>                                        <C>           <C>                 <C>          <C>            <C>          <C>
David C. Hayden ......................      1,335,226         $71,098,070           --         28,410     $       --   $   872,982
Douglas T. Hickey (3).................         29,000             909,194      230,169      1,015,518     $6,885,275   $30,378,205
William H. Rinehart...................        198,864          10,058,310           --        217,803     $       --   $ 6,515,359
Mark J. Rubash........................             --                  --       98,958             --     $       --   $        --
Mari E. Tangredi......................         36,000           2,214,998      118,601        144,889     $3,531,037   $ 4,296,564
David A. Thatcher.....................        102,000           7,338,228      186,055        288,055     $5,565,649   $ 8,616,877
Cynthia Diana Whitehead...............         35,000           1,101,800       88,541        206,459     $  442,969   $   873,281
</TABLE>

----------

(1)  The value realized is calculated by determining the difference between the
     fair market value of the securities underlying the options and the exercise
     price of the options at the time of exercise.

(2)  The value of unexercised in-the-money options at fiscal year-end is based
     on a price per share of $30.75, the closing price quoted on Nasdaq as of
     December 29, 2000, less the exercise price.

(3)  Mr. Hickey's option agreements allowed for early exercise subject to
     repurchase by the Company over the vesting period. Shares that would, as of
     December 31, 2000, be subject to repurchase if issued upon the exercise of
     options, are reflected in the "Unexercisable" columns in the table above.

COMPENSATION OF DIRECTORS

    Critical Path reimburses each member of its Board of Directors for
out-of-pocket expenses incurred in connection with attending Board meetings. No
member of Critical Path's Board of Directors receives any additional cash
compensation.

COMPENSATION COMMITTEE INTERLOCKS AND INSIDE PARTICIPATION

    During fiscal 2000, Lisa Gansky and Kevin Harvey, two of the Company's
non-employee directors, served on the Compensation Committee. During fiscal
2000, no member of the Company's Board of Directors or Compensation Committee
served as a member of the board of directors or compensation committee of any
entity that had one or more executive officers serving as a member of the
Company's Board of Directors or Compensation Committee.

SEVERANCE AGREEMENTS

     Mark Rubash resigned as Executive Vice President and Chief Financial
Officer of the Company in December 2000. In connection with his resignation, Mr.
Rubash entered into a settlement agreement and mutual release. Pursuant to the
agreement, Mr. Rubash received a bonus payment of $250,000.

     Douglas Hickey resigned as Chief Executive Officer of the Company in
February 2001. In connection with his resignation, Mr. Hickey entered into an
agreement and release detailing his resignation from the Company. Pursuant to
the agreement, Mr. Hickey received (i) nine months base salary plus automobile
allowance, (ii) immediate vesting of all stock options that would vest on or
prior to August 9, 2001, (iii) continuing health benefit coverage through
February 2002, including payment for his annual physical and related travel
expenses, (iv) continuation of existing financial planning services, and (v) use
of the Company's corporate apartment until May 2001. The Company and Mr. Hickey
were parties to a letter agreement dated October 1, 1998 governing his
employment with the Company. The agreement had set forth Mr. Hickey's
compensation level and eligibility for salary increases, bonuses, benefits and
option grants under the 1998 Stock Plan. In connection with his employment
agreement, Mr. Hickey also received a loan in the amount of $500,000, bearing
interest at 4.51%. The repayment of the loan has been extended until March 2002
and shall remain nonrecourse.
<PAGE>   6
                      REPORT OF THE COMPENSATION COMMITTEE

     The Company applies a consistent philosophy to compensation for all
employees, including senior management. This philosophy is based on the premise
that the achievements of the Company result from the coordinated efforts of all
individuals working toward common objectives. The Company strives to achieve
those objectives through teamwork that is focused on meeting the expectations
of customers and shareholders.

COMPENSATION PHILOSOPHY

     The goals of the compensation program are to align compensation with
business objectives and performance, and to enable the Company to attract,
retain and reward executive officers whose contributions are critical to the
long-term success of the Company. The Company's compensation program for
executive officers is based on the same four principles applicable worldwide to
compensation decisions for all employees of the Company:

     -  The Company pays competitively.

        The Company is committed to maintaining a pay program that helps attract
        and retain the best people in the industry. To ensure that pay is
        competitive, the Company regularly compares its pay practices with those
        of other leading companies and sets its pay parameters based in part on
        this review.

     -  The Company pays for sustained performance.

        Executive officers are rewarded based upon corporate performance,
        business unit performance and individual performance. Corporate
        performance and business unit performance are evaluated by reviewing the
        extent to which strategic and business plan goals are met, including
        such factors as profitability, performance relative to competitors and
        timely new product introductions. Individual performance is evaluated by
        reviewing organizational and management development progress against set
        objectives and the degree to which teamwork and Company values are
        fostered.

     -  The Company strives for fairness in the administration of pay.

        The Company strives to compensate a particular individual equitably
        compared to other executives at similar levels both inside the Company
        and at comparable companies.

     -  The Company believes that employees, including executive officers,
        should understand the performance evaluation and pay administration
        process.

        The process of assessing the performance is as follows:

          1. At the beginning of the performance cycle, the evaluating manager
             and the employee, or the Compensation Committee and the executive
             officer, set and agree upon objectives and key goals.

          2. The evaluating manager gives the employee ongoing feedback on
             performance.

          3. At the end of the performance cycle, the manager evaluates the
             accomplishment of objectives and key goals.

          4. The evaluating manager communicates the comparative results to the
             employee.

          5. The comparative results affect decisions on salary and, if
             applicable, stock incentives.

<PAGE>   7
COMPENSATION VEHICLES

      The Company has had a successful history of using a simple total
compensation program that consists of cash and equity-based compensation.
Having a compensation program that allows the Company to attract and retain key
employees permits it to provide useful products and services to customers,
enhance shareholder value, motivate technological innovation, foster teamwork,
and adequately reward employees. The vehicles are:

      CASH-BASED COMPENSATION

      Salary

            The Company establishes salary ranges for employees, including
executive officers, by reviewing the aggregate of base salaries for competitive
positions in the market. The Company uses salary survey data and generally, the
Company sets its competitive salary midpoint for an executive officer position
at the median level compared to those companies it surveys. The Company then
creates a salary range based on this midpoint. The range is designed to place an
executive officer at, above or below the midpoint, according to that officer's
overall individual performance. As described above, overall individual
performance is measured against the following factors: long-term strategic
goals, short-term business goals, the development of employees and the fostering
of teamwork and other Company values. In both setting goals and measuring an
executive officer's performance against those goals, the Company takes into
account the performance of its competitors and general economic and market
conditions. None of the factors included in the Company's strategic and business
goals is assigned a specific weight. Instead, the Company recognizes that these
factors may change in order to adapt to specific business challenges and to
changing economic and marketplace conditions.

            The Company does not have a formal bonus plan. However,
discretionary bonuses were paid to certain officers in fiscal 2000.

      EQUITY-BASED COMPENSATION

      Stock Incentive Program

            The purpose of this program is to provide additional incentives to
employees to work towards maximizing shareholder value. The Company also
recognizes that a stock incentive program is a necessary element of a
competitive compensation package for its employees. The program utilizes vesting
periods to encourage key employees to continue in the employ of the Company and
thereby acts as a retention device for key employees. The Company believes that
the program encourages employees to maintain a long-term perspective.

CEO COMPENSATION

      Douglas T. Hickey served as the Chief Executive Officer and a director of
Critical Path from October 1998 to February 2001, and was also President of the
Company from October 1998 through January 2000. The Compensation Committee used
the same compensation policy described above for all employees to determine Mr.
Hickey's fiscal 2000 compensation.

      In setting both the cash-based and equity-based elements of Mr. Hickey's
compensation, the Compensation Committee made an overall assessment of Mr.
Hickey's leadership in achieving the Company's long-term strategic and business
goals.

                                          COMPENSATION COMMITTEE

                                          Lisa A. Gansky
                                          George Zachary
<PAGE>   8
                            STOCK PERFORMANCE GRAPH

     The graph below compares the cumulative total shareholder return on the
Company's Common Stock with the cumulative total return on the NASDAQ Stock
Market (U.S. companies) Index and the JP Morgan H&Q Internet 100 Index
(formerly the Chase Internet Index). The period shown commences on March 29,
1999, the Company's first trading day on NASDAQ, and ends on December 31, 2000,
the end of the Company's last fiscal year. The graph assumes an investment of
$100 on March 29, 1999, and the reinvestment of any dividends.

     The comparisons in the graph below are based on historical data and are
not indicative of, nor intended to forecast, future performance of the
Company's Common Stock.

                COMPARISON OF 21 MONTH CUMULATIVE TOTAL RETURN*
        AMONG CRITICAL PATH, INC., THE NASDAQ STOCK MARKET (U.S.) INDEX
                    AND THE JP MORGAN H&Q INTERNET 100 INDEX

<TABLE>
<CAPTION>
                              3/29/99    3/99    6/99    9/99   12/99    3/00    6/00    9/00   12/00
                              -------    ----    ----    ----   -----    ----    ----    ----   -----
<S>                           <C>       <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
Critical Path, Inc.           100.00    116.69   83.97   61.24  143.26  129.03   88.52   92.22  46.68
NASDAQ Stock Market (U.S.)    100.00     98.70  107.97  110.86  163.55  183.58  159.63  146.89  98.32
JP Morgan H&Q Internet 100    100.00     98.56  101.51  104.35  202.00  210.89  156.52  150.57  77.32
</TABLE>

     Notwithstanding anything to the contrary set forth in any of the Company's
previous filings under the Securities Act of 1933, as amended, or the Securities
Exchange Act of 1934, as amended, that might incorporate future filings,
including this Amendment No. 1 to Annual Report on Form 10-K, in whole or in
part, the preceding Report of the Compensation Committee and the preceding
Performance Graph shall not be incorporated by reference into any of these
filings; nor shall the report or graph be incorporated by reference into any
future filings.
<PAGE>   9
ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

    The following table sets forth certain information regarding beneficial
ownership of common stock as of April 16, 2001 by:

    o   each person or entity known to Critical Path to own beneficially more
        than 5% of Critical Path's Common Stock;

    o   each of Critical Path's directors;

    o   the Chief Executive Officer of the Company as of December 31, 2000, each
        of the four other most highly compensated executive officers of the
        Company whose total salary and bonus exceeded $100,000 during the year
        ended December 31, 2000, and two former executive officers whose total
        salary and bonus exceeded $100,000 during the year ended December 31,
        2000 (collectively, the "Named Executive Officers"); and

    o   all executive officers and directors as a group.

<TABLE>
<CAPTION>
                                                                                                       SHARES BENEFICIALLY
                                                                                                            OWNED (2)
      NAME AND ADDRESS OF BENEFICIAL OWNER (1)                                                         NUMBER       PERCENT
      ----------------------------------------                                                      ------------  ---------
<S>                                                                                                 <C>           <C>
      FMR Corp. (3)
        c/o Fidelity Management & Research Company
        82 Devonshire Street
        Boston, MA 02109........................................................................       9,207,551    12.4%

      Putnam Investments, LLC (4)
        One Post Office Square
        Boston, MA 02109........................................................................       5,067,902     6.8%

      David C. Hayden (5).......................................................................       2,271,672     3.1%

      Lisa A. Gansky ...........................................................................         162,137      *

      Kevin M. Harvey (6) ......................................................................       1,886,919     2.5%

      Amy Rao...................................................................................               0      *

      George Zachary ...........................................................................          58,824      *

      Douglas T. Hickey (7).....................................................................       1,269,410     1.7%

</TABLE>


<PAGE>   10
<TABLE>
<CAPTION>
                                                                                                       SHARES BENEFICIALLY
                                                                                                            OWNED (2)
      NAME AND ADDRESS OF BENEFICIAL OWNER (1)                                                         NUMBER       PERCENT
      ----------------------------------------                                                      ------------  ---------
<S>                                                                                                 <C>           <C>
      William H. Rinehart ......................................................................         132,325      *

      Mark J. Rubash ...........................................................................               0      *

      Mari E. Tangredi (8)......................................................................         325,490      *

      David A. Thatcher ........................................................................         224,060      *

      Cynthia Diana Whitehead (9)...............................................................         113,293      *

      All directors and executive officers as a group (17 persons) (10).........................       6,632,183     8.8%

</TABLE>
----------

        *Less than 1%.

         (1)  Unless otherwise indicated, the address for each of the executive
              officers and directors above is c/o Critical Path, Inc., 532
              Folsom Street, San Francisco, California 94105.

         (2)  Applicable percentage ownership is based on 74,253,706 shares of
              Common Stock outstanding as of April 16, 2001. Beneficial
              ownership is determined in accordance with the rules and
              regulations of the Securities and Exchange Commission. In
              computing the number of shares beneficially owned by a person and
              the percentage ownership of that person, shares of Common Stock
              subject to options held by that person that are currently
              exercisable or exercisable within 60 days of April 16, 2001 are
              deemed outstanding. These shares, however, are not deemed
              outstanding for the purposes of computing the percentage ownership
              of another person. Except as indicated in the footnotes to this
              table and pursuant to applicable community property laws, each
              shareholder named in the table has sole voting and investment
              power with respect to the shares set forth opposite such
              shareholder's name.

          (3) FMR Corp. filed Amendment No. 1 to a Schedule 13G, dated February
              14, 2001, with the Securities and Exchange Commission on behalf of
              itself and related parties. FMR Corp. reported sole voting power
              over 421,961 shares and sole dispositive power over 9,207,551
              shares.

         (4)  Putnam Investments, LLC ("Putnam Investments") filed a Schedule
              13G, dated February 13, 2001, with the Securities and Exchange
              Commission on behalf of itself and related parties. Putnam
              Investments reported sole voting power over none of the shares and
              sole dispositive power over 5,067,902 shares.

         (5)  Includes 29,256 shares subject to options exercisable within 60
              days after April 16, 2001.

         (6)  Includes 1,686,769 shares held by Benchmark Capital Partners II,
              L.P., of which Mr. Harvey is a managing partner. Mr. Harvey
              disclaims beneficial ownership of all such shares except to the
              extent of his pecuniary interest therein.

         (7)  Includes 18,180 shares held in the name of Mr. Hickey's minor
              childrens' name.

         (8)  Includes 263,490 shares subject to options exercisable within 60
              days after April 16, 2001.

         (9)  Includes 111,250 shares subject to options exercisable within 60
              days after April 16, 2001.

        (10)  See Footnotes (5) through (9). Includes 1,138,811 shares subject
              to options exercisable within 60 days after April 16, 2001.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS

ACQUISITION

     In March 2000, the Company acquired RemarQ Communities, Inc. ("RemarQ") for
a total purchase price of approximately $267.6 million consisting of Common
Stock valued at $259.3 million, assumed stock options with an estimated fair
market value of $7.7 million, and other acquisition related expenses of
approximately $600,000. At the time of the acquisition, Benchmark Capital
Partners II, L.P. ("Benchmark") held approximately 29% of RemarQ's outstanding
shares. Kevin Harvey is a managing member of Benchmark and served as a director
of RemarQ. Additionally, David Hayden and Lisa Gansky each served on RemarQ's
advisory Board and held a nominal number of RemarQ stock options.



<PAGE>   11

LOANS TO OFFICERS

     In November 1998, the Company loaned Douglas Hickey, the Company's former
Chief Executive Officer, $1.1 million pursuant to a promissory note bearing
interest at the rate of 4.51% per annum. In connection with Mr. Hickey's
resignation from the Company, the repayment of the loan has been extended to May
2002.

     In January 1999, the Company loaned William Rinehart, the Company's former
Vice President of Worldwide Sales, $65,000 pursuant to a promissory note bearing
interest at the rate of 4.64% per annum. The note is presently due and payable.

     In January 2000, the Company loaned Mark Rubash, the Company's former
Executive Vice President and Chief Financial Officer, $100,000. The loan was
repaid in full in December 2000 in connection with Mr. Rubash's resignation from
the Company.

     In December 2000, the Company loaned Lawrence Reinhold, the Company's
Executive Vice President and Chief Financial Officer, $1.7 million. The loan
accrues interest at 6.0% per annum and both principal and accrued interest are
being forgiven over a specified period. Additionally, the repayment of the
outstanding loan is subject to certain change of control and employment
termination criteria.

COMMERCIAL RELATIONSHIPS

    During 2000, the Company leased an aircraft, for use by certain officers of
the Company, from D Squared LLC, in which Douglas Hickey and David Thatcher, the
Company's former Chief Executive Officer and former President respectively, had
a direct investment. The aggregate amount billed to the Company for the use of
the aircraft or other aircraft arranged through D Squared LLC aggregated
approximately $337,000.

    In March 2001, the Company entered into an agreement with Vectis Group, LLC
("Vectis Group") to engage Vectis Group to act as an advisor to the Company with
respect to various strategic alternatives the Company is currently exploring.
The agreement provides Vectis Group with (i) a $50,000 monthly retainer during
the term of the agreement, (ii) the issuance of a warrant to purchase 500,000
shares of the Company's Common Stock at a price of $2.00 per share, and (iii)
transaction fees in connection with certain dispositions or acquisitions
consummated during the term of the agreement or within certain periods from the
termination of such agreement. The agreement may be terminated at the option of
either party, but Vectis Group may be entitled to transaction fees under certain
scenarios for two years following the termination of the agreement. William
McGlashan, Jr., who was appointed the Company's interim Chief Operating Officer
in April 2001, serves as the Chief Executive Officer of Vectis Group and holds
significant beneficial ownership in Vectis Group. David Hayden, the Company's
Executive Chairman of the Board, serves on the Executive and Advisory Boards of
Vectis Group. Additionally, Archipelago, of which Mr. Hayden is Executive
Chairman and founder, serves as an investment partner to Vectis Group. Mr.
Hayden does not have any equity or voting interest in Vectis Group and will not
receive any direct or indirect compensation related to the Company's
relationship with Vectis Group.


INDEMNIFICATION

    The Company's articles of incorporation limit the liability of its directors
for monetary damages arising from a breach of their fiduciary duty as directors,
except to the extent otherwise required by the California Corporations Code.
Such limitation of liability does not affect the availability of equitable
remedies such as injunctive relief or rescission.

    The Company's bylaws provide that the Company may indemnify its directors
and officers to the fullest extent permitted by California law, including in
circumstances in which indemnification is otherwise discretionary under
California law. The Company also has entered into indemnification agreements
with its officers and directors containing provisions that may require the
Company, among other things, to indemnify such officers and directors against
certain liabilities that may arise by reason of their status or service as
directors or officers (other than liabilities arising from willful misconduct of
a culpable nature), to advance their expenses incurred as a result of any
proceeding against them as to which they could be indemnified, and to obtain
directors' and officers' insurance if available on reasonable terms.

RELATED TRANSACTIONS POLICY

    The Company believes that the foregoing transactions were in its best
interests. It is the Company's current policy that all transactions by the
Company with officers, directors, five percent shareholders and their affiliates
will be entered into only if such





<PAGE>   12

transactions are approved by a majority of the disinterested independent
directors, are on terms no less favorable to the Company than could be obtained
from unaffiliated parties and are reasonably expected to benefit the Company.


<PAGE>   13




                                   SIGNATURES

    Pursuant to the requirements of the Securities Exchange Act of 1934, as
amended, the Registrant has duly caused this Annual Report on Form 10-K to be
signed on its behalf by the undersigned, thereunto duly authorized, in the City
of San Francisco, State of California, on the 30th day of April, 2001.

                                      Critical Path, Inc.

                                      By: /s/   LAWRENCE P. REINHOLD
                                          --------------------------------
                                                Lawrence P. Reinhold
                                            Executive Vice President and
                                              Chief Financial Officer

    Pursuant to the requirements of the Securities Exchange Act of 1934, this
amendment to its Annual Report on Form 10-K has been signed below by the
following persons in the capacities and on the dates indicated.


<TABLE>
<CAPTION>

                         Name                                                    Title                                   Date
                         ----                                                    -----                                   ----
<S>                                                                <C>                                              <C>
                           *                                        Executive Chairman of the Board                 April 30, 2001
-----------------------------------------------------
                    David C. Hayden

                  /s/ WILLIAM E. MCGLASHAN, JR.                         Chief Operating Officer                     April 30, 2001
-----------------------------------------------------                (Principal Executive Officer)
                    William E. McGlashan Jr.

               /s/ LAWRENCE P. REINHOLD                              Executive Vice President and                   April 30, 2001
-----------------------------------------------------                 Chief Financial Officer
                 Lawrence P. Reinhold                        (Principal Financial and Accounting Officer)


                           *                                              Executive Director                        April 30, 2001
-----------------------------------------------------
                      Lisa A. Gansky

                           *                                                   Director                             April 30, 2001
-----------------------------------------------------
                    Kevin R. Harvey

                           *                                                   Director                             April 30, 2001
-----------------------------------------------------
                        Amy Rao

                           *                                                   Director                             April 30, 2001
-----------------------------------------------------
                    George Zachary

</TABLE>

                                     *By: /s/   LAWRENCE P. REINHOLD
                                          --------------------------------
                                                Lawrence P. Reinhold
                                                  Attorney-in-fact