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 31, 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 August 31, 1999, Critical Path, Inc. ("Critical Path") completed its
  acquisition of Amplitude Software Corp. ("Amplitude") pursuant to the terms of
  the Agreement and Plan of Reorganization dated June 22, 1999, among Critical
  Path, Amplitude and Apollo Acquisition Corp., a wholly-owned subsidiary of
  Critical Path ("Merger Sub").  Pursuant to the terms of the Reorganization
  Agreement, Amplitude merged with and into Merger Sub and became a wholly-owned
  subsidiary of Critical Path.  In addition, each issued and outstanding share of
  Amplitude common stock was converted into the right to receive shares of
  Critical Path common stock at an exchange ratio of 0.135186988 and $1.69856780
  in cash.  Each issued and outstanding share of Amplitude Series A Preferred
  Stock was converted into the right to receive shares of Critical Path common
  stock at an exchange ratio of 0.13685308 and $1.69856780 in cash.  Each issued
  and outstanding share of Amplitude Series B Preferred Stock was converted into
  the right to receive shares of Critical Path common stock at an exchange ratio
  of 0.14907106 and $1.69856780 in cash.  Each issued and outstanding share of
  Amplitude Series B-1 Preferred Stock was converted into the right to receive
  shares of Critical Path common stock at an exchange ratio of 0.15328904 and
  $1.69856780 in cash.  Each issued and outstanding share of Amplitude Series C
  Preferred Stock was converted into the right to receive shares of Critical Path
  common stock at an exchange ratio of 0.16156672 and $1.69856780 in cash.  Each
  issued and outstanding share of Amplitude Series D Preferred Stock was converted
  into the right to receive shares of Critical Path common stock at an exchange
  ratio of 0.17767224 and $1.69856780 in cash.  Critical Path assumed 3,203,534
  outstanding options to acquire Amplitude 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 0.182353049339.  Critical Path issued
  4,107,310 shares of Critical Path common stock in the merger and, in addition,
  assumed options that can be exercised for approximately 584,174 shares of
  Critical Path common stock.
  
       The exchange ratios were determined through negotiations between the
  managements of Critical Path and Amplitude, and were approved by their
  respective boards of directors on June 22, 1999.  Amplitude shareholders
  approved the Merger through written consents to action in lieu of a stockholder
  meeting dated as of August 27, 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 June 22, 1999,
                     among Critical Path Inc., Amplitude Software Corp. and Apollo
                     Acquisition Corp.
  
                99.1 Press Release by Critical Path, Inc., dated August 31, 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:  September 13, 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 31, 1999
  
  Exhibit
  
  2.1   Agreement and Plan of Reorganization, dated June 22, 1999, among Critical
        Path Inc., Amplitude Software Corp. and Apollo Acquisition Corp.
  
  99.1  Press Release by Critical Path, Inc., dated August 31, 1999, announcing
        completion of the acquisition.
metadata_documents: [{"type": "8-K", "sequence": "1", "description": "FORM 8-K", "secsgml_size_bytes": 6320}]
metadata_filer: {"company-data": {"conformed-name": "CRITICAL PATH INC", "cik": "0001060801", "assigned-sic": "7389", "irs-number": "911788300", "state-of-incorporation": "CA", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-25331", "film-number": "99710592"}, "business-address": {"street1": "320 FIRST STREET", "city": "SAN FRANCISCO", "state": "CA", "zip": "94105", "phone": "6502334512"}, "mail-address": {"street1": "320 FIRST STREET", "city": "SAN FRNACISCO", "state": "CA", "zip": "94105"}}
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 31, 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 August 31, 1999, Critical Path, Inc. ("Critical Path") completed its
  acquisition of Amplitude Software Corp. ("Amplitude") pursuant to the terms of
  the Agreement and Plan of Reorganization dated June 22, 1999, among Critical
  Path, Amplitude and Apollo Acquisition Corp., a wholly-owned subsidiary of
  Critical Path ("Merger Sub").  Pursuant to the terms of the Reorganization
  Agreement, Amplitude merged with and into Merger Sub and became a wholly-owned
  subsidiary of Critical Path.  In addition, each issued and outstanding share of
  Amplitude common stock was converted into the right to receive shares of
  Critical Path common stock at an exchange ratio of 0.135186988 and $1.69856780
  in cash.  Each issued and outstanding share of Amplitude Series A Preferred
  Stock was converted into the right to receive shares of Critical Path common
  stock at an exchange ratio of 0.13685308 and $1.69856780 in cash.  Each issued
  and outstanding share of Amplitude Series B Preferred Stock was converted into
  the right to receive shares of Critical Path common stock at an exchange ratio
  of 0.14907106 and $1.69856780 in cash.  Each issued and outstanding share of
  Amplitude Series B-1 Preferred Stock was converted into the right to receive
  shares of Critical Path common stock at an exchange ratio of 0.15328904 and
  $1.69856780 in cash.  Each issued and outstanding share of Amplitude Series C
  Preferred Stock was converted into the right to receive shares of Critical Path
  common stock at an exchange ratio of 0.16156672 and $1.69856780 in cash.  Each
  issued and outstanding share of Amplitude Series D Preferred Stock was converted
  into the right to receive shares of Critical Path common stock at an exchange
  ratio of 0.17767224 and $1.69856780 in cash.  Critical Path assumed 3,203,534
  outstanding options to acquire Amplitude 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 0.182353049339.  Critical Path issued
  4,107,310 shares of Critical Path common stock in the merger and, in addition,
  assumed options that can be exercised for approximately 584,174 shares of
  Critical Path common stock.
  
       The exchange ratios were determined through negotiations between the
  managements of Critical Path and Amplitude, and were approved by their
  respective boards of directors on June 22, 1999.  Amplitude shareholders
  approved the Merger through written consents to action in lieu of a stockholder
  meeting dated as of August 27, 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 June 22, 1999,
                     among Critical Path Inc., Amplitude Software Corp. and Apollo
                     Acquisition Corp.
  
                99.1 Press Release by Critical Path, Inc., dated August 31, 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:  September 13, 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 31, 1999
  
  Exhibit
  
  2.1   Agreement and Plan of Reorganization, dated June 22, 1999, among Critical
        Path Inc., Amplitude Software Corp. and Apollo Acquisition Corp.
  
  99.1  Press Release by Critical Path, Inc., dated August 31, 1999, announcing
        completion of the acquisition.