content: <PAGE>
  
  ================================================================================
  
                        SECURITIES AND EXCHANGE COMMISSION
  
                              Washington, D.C. 20549
  
                                     FORM 8-K
  
                                  CURRENT REPORT
  
                        Pursuant to Section 13 or 15(d) of
  
                        the Securities Exchange Act of 1934
  
                                  August 2, 1999
  
                 Date of Report (date of earliest event reported)
  
                                CRITICAL PATH, INC.
  --------------------------------------------------------------------------------
              (Exact name of Registrant as specified in its charter)
  
  <TABLE>
  <S>                                             <C>                                <C>
              California                                 000-25331                                91-1788300
  ----------------------------------------------------------------------------------------------------------------------------
     (State or other jurisdiction of              (Commission File Number)             (I.R.S. Employer Identification No.)
     incorporation or organization)
  </TABLE>
  
  
                                 320 First Street
                          San Francisco, California 94105
                     (Address of principal executive offices)
  
        Registrant's telephone number, including area code:  (415) 808-8800
  
                                        N/A
  --------------------------------------------------------------------------------
           (Former name or former address, if changed since last report)
  
  
  
  ================================================================================
  <PAGE>
  
  Item 2.   Acquisition or Disposition of Assets
            ------------------------------------
  
            On July 21, 1999, Critical Path, Inc. ("Critical Path") completed its
  acquisition of dotOne Corporation ("dotOne") pursuant to the terms of the
  Agreement and Plan of Reorganization dated July 15, 1999, among Critical Path,
  dotOne and dotOne Acquisition Corp., a wholly-owned subsidiary of Critical Path
  ("Merger Sub").  Pursuant to the terms of the Reorganization Agreement, dotOne
  merged with and into Merger Sub and became a wholly-owned subsidiary of Critical
  Path.  In addition, each issued and outstanding share of dotOne common stock was
  converted into the right to receive shares of Critical Path common stock at an
  Exchange Ratio of 0.106770612.  Critical Path assumed 586,980 outstanding
  options to acquire dotOne common stock as options to acquire Critical Path
  common stock, on the same terms as the original option, adjusted to reflect the
  Option Exchange Ratio of 0.130652227.  The holders of 107,520 options to acquire
  dotOne common stock elected to receive $684,934 cash in exchange for the
  retirement of these options.  Critical Path issued 640,623 shares of Critical
  Path common stock in the merger and assumed options that can be exercised for
  approximately 76,690 shares of Critical Path common stock.
  
            The Exchange Ratio and Option Exchange Ratio were determined through
  negotiations between the managements of Critical Path and dotOne, and were
  approved by their respective boards of directors on June 22, 1999.  dotOne
  shareholders approved the Merger through written consents to action in lieu of a
  stockholder meeting dated as of July 20, 1999.
  
  Item 7.   Financial Statements and Exhibits
            ---------------------------------
  
            (a)  Financial Statements
  
            The financial statements are unavailable as of the date of this
            filing. Such information will be filed on or before the sixtieth day
            following the filing date of this Current Report on Form 8-K.
  
            (b)  Pro Forma Financial Information
  
            The pro forma financial information is unavailable as of the date of
            this filing. Such information will be filed on or before the sixtieth
            day following the filing date of this Current Report on Form 8-K.
  
            (c)  Exhibits
  
                 2.1  Agreement and Plan of Reorganization, dated July 15, 1999,
                      among Critical Path Inc., dotOne Corporation and dotOne
                      Acquisition Corp.
  
                99.1  Press Release by Critical Path, Inc., dated July 21, 1999,
                      announcing completion of the acquisition.
  <PAGE>
  
            Pursuant to the requirements of the Securities Exchange Act of 1934,
  as amended, the Registrant has duly caused this Report to be signed on its
  behalf by the undersigned hereunto duly authorized.
  
  Dated:  August 2, 1999      CRITICAL PATH, INC.
  
                              /s/ David A. Thatcher
                              --------------------------------------------
                              David A. Thatcher
                              Executive Vice President and Chief Financial Officer
  <PAGE>
  
                                CRITICAL PATH, INC.
  
                             EXHIBIT INDEX TO FORM 8-K
                               Dated August 2, 1999
  
  Exhibit
  
  2.1       Agreement and Plan of Reorganization, dated July 15, 1999, among
            Critical Path Inc., dotOne Corporation and dotOne Acquisition Corp.
  
  99.1      Press Release by Critical Path, Inc., dated July 21, 1999, announcing
            completion of the acquisition.
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text: ================================================================================
  
                        SECURITIES AND EXCHANGE COMMISSION
  
                              Washington, D.C. 20549
  
                                     FORM 8-K
  
                                  CURRENT REPORT
  
                        Pursuant to Section 13 or 15(d) of
  
                        the Securities Exchange Act of 1934
  
                                  August 2, 1999
  
                 Date of Report (date of earliest event reported)
  
                                CRITICAL PATH, INC.
  --------------------------------------------------------------------------------
              (Exact name of Registrant as specified in its charter)
  California                                 000-25331                                91-1788300
  ----------------------------------------------------------------------------------------------------------------------------
     (State or other jurisdiction of              (Commission File Number)             (I.R.S. Employer Identification No.)
     incorporation or organization)
  320 First Street
                          San Francisco, California 94105
                     (Address of principal executive offices)
  
        Registrant's telephone number, including area code:  (415) 808-8800
  
                                        N/A
  --------------------------------------------------------------------------------
           (Former name or former address, if changed since last report)
  
  ================================================================================
  Item 2.   Acquisition or Disposition of Assets
            ------------------------------------
  
            On July 21, 1999, Critical Path, Inc. ("Critical Path") completed its
  acquisition of dotOne Corporation ("dotOne") pursuant to the terms of the
  Agreement and Plan of Reorganization dated July 15, 1999, among Critical Path,
  dotOne and dotOne Acquisition Corp., a wholly-owned subsidiary of Critical Path
  ("Merger Sub").  Pursuant to the terms of the Reorganization Agreement, dotOne
  merged with and into Merger Sub and became a wholly-owned subsidiary of Critical
  Path.  In addition, each issued and outstanding share of dotOne common stock was
  converted into the right to receive shares of Critical Path common stock at an
  Exchange Ratio of 0.106770612.  Critical Path assumed 586,980 outstanding
  options to acquire dotOne common stock as options to acquire Critical Path
  common stock, on the same terms as the original option, adjusted to reflect the
  Option Exchange Ratio of 0.130652227.  The holders of 107,520 options to acquire
  dotOne common stock elected to receive $684,934 cash in exchange for the
  retirement of these options.  Critical Path issued 640,623 shares of Critical
  Path common stock in the merger and assumed options that can be exercised for
  approximately 76,690 shares of Critical Path common stock.
  
            The Exchange Ratio and Option Exchange Ratio were determined through
  negotiations between the managements of Critical Path and dotOne, and were
  approved by their respective boards of directors on June 22, 1999.  dotOne
  shareholders approved the Merger through written consents to action in lieu of a
  stockholder meeting dated as of July 20, 1999.
  
  Item 7.   Financial Statements and Exhibits
            ---------------------------------
  
            (a)  Financial Statements
  
            The financial statements are unavailable as of the date of this
            filing. Such information will be filed on or before the sixtieth day
            following the filing date of this Current Report on Form 8-K.
  
            (b)  Pro Forma Financial Information
  
            The pro forma financial information is unavailable as of the date of
            this filing. Such information will be filed on or before the sixtieth
            day following the filing date of this Current Report on Form 8-K.
  
            (c)  Exhibits
  
                 2.1  Agreement and Plan of Reorganization, dated July 15, 1999,
                      among Critical Path Inc., dotOne Corporation and dotOne
                      Acquisition Corp.
  
                99.1  Press Release by Critical Path, Inc., dated July 21, 1999,
                      announcing completion of the acquisition.
  Pursuant to the requirements of the Securities Exchange Act of 1934,
  as amended, the Registrant has duly caused this Report to be signed on its
  behalf by the undersigned hereunto duly authorized.
  
  Dated:  August 2, 1999      CRITICAL PATH, INC.
  
                              /s/ David A. Thatcher
                              --------------------------------------------
                              David A. Thatcher
                              Executive Vice President and Chief Financial Officer
  CRITICAL PATH, INC.
  
                             EXHIBIT INDEX TO FORM 8-K
                               Dated August 2, 1999
  
  Exhibit
  
  2.1       Agreement and Plan of Reorganization, dated July 15, 1999, among
            Critical Path Inc., dotOne Corporation and dotOne Acquisition Corp.
  
  99.1      Press Release by Critical Path, Inc., dated July 21, 1999, announcing
            completion of the acquisition.