UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 -------------- SCHEDULE 13D (AMENDMENT NO. 1) UNDER THE SECURITIES EXCHANGE ACT OF 1934 CONCERTO SOFTWARE, INC. -------------------------------------------------------------------------------- (Name of Issuer) COMMON STOCK, PAR VALUE $0.10 PER SHARE -------------------------------------------------------------------------------- (Title of Class of Securities) 20602t106 -------------------------------------------------------------------------------- (CUSIP Number) Ernest Mysogland with a copy to: ISIS Capital Management, LLC 1465 Post Road East, 2d Floor George Y. Liu Westport, Connecticut 06880 Boies, Schiller & Flexner LLP Tel. No.: (203) 259-7387 333 Main St. Armonk, New York 10504 Tel. No.: (914) 749-8200 -------------------------------------------------------------------------------- (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) DECEMBER 18, 2003 -------------------------------------------------------------------------------- (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 statement because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box: { } 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). SCHEDULE 13D CUSIP No. 20602t106 ------------------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON ISIS Capital Management, LLC I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) {X} (b) { } -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS 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 NUMBER OF SHARES 8,250 BENEFICIALLY -------------------------------------------------------- OWNED BY EACH 8 SHARED VOTING POWER REPORTING PERSON 0 WITH -------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 8,250 -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 8,250 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES {x} -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) .1% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON OO -------------------------------------------------------------------------------- SCHEDULE 13D CUSIP No. 20602t106 ------------------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON Rodney Bienvenu I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) {X} (b) { } -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS NA -------------------------------------------------------------------------------- 5 CHECK BOX 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 NUMBER OF SHARES 0 BENEFICIALLY -------------------------------------------------------- OWNED BY EACH 8 SHARED VOTING POWER REPORTING PERSON 8,250 WITH -------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 0 -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 8,250 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 8,250 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES {x} -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) .1% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON IN -------------------------------------------------------------------------------- SCHEDULE 13D CUSIP No. 20602t106 ------------------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON Richard Rofe I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) {X} (b) { } -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS NA -------------------------------------------------------------------------------- 5 CHECK BOX 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 NUMBER OF SHARES 0 BENEFICIALLY -------------------------------------------------------- OWNED BY EACH 8 SHARED VOTING POWER REPORTING PERSON 8,250 WITH -------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 0 -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 8,250 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 8,250 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES {x} -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) .1% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON IN -------------------------------------------------------------------------------- SCHEDULE 13D CUSIP No. 20602t106 ------------------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON Ernest Mysogland I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) {X} (b) { } -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS NA -------------------------------------------------------------------------------- 5 CHECK BOX 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 NUMBER OF SHARES 0 BENEFICIALLY -------------------------------------------------------- OWNED BY EACH 8 SHARED VOTING POWER REPORTING PERSON 8,250 WITH -------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 0 -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 8,250 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 8,250 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES {x} -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) .1% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON IN -------------------------------------------------------------------------------- SCHEDULE 13D CUSIP No. 20602t106 ------------------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON Kevin Goodman I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) {X} (b) { } -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS NA -------------------------------------------------------------------------------- 5 CHECK BOX 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 NUMBER OF SHARES 0 BENEFICIALLY -------------------------------------------------------- OWNED BY EACH 8 SHARED VOTING POWER REPORTING PERSON 8,250 WITH -------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 0 -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 8,250 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 8,250 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES {x} -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) .1% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON IN -------------------------------------------------------------------------------- SCHEDULE 13D CUSIP No. 20602t106 ------------------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON Ramius Securities, LLC I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) {X} (b) { } -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS 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 NUMBER OF SHARES 219,470 BENEFICIALLY -------------------------------------------------------- OWNED BY EACH 8 SHARED VOTING POWER REPORTING PERSON 0 WITH -------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 219,470 -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 219,470 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES {X} -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON BD, OO -------------------------------------------------------------------------------- SCHEDULE 13D CUSIP No. 20602t106 ------------------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON Ramius Capital Group, LLC I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) {X} (b) { } -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS NA -------------------------------------------------------------------------------- 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 NUMBER OF SHARES 890,000 BENEFICIALLY -------------------------------------------------------- OWNED BY EACH 8 SHARED VOTING POWER REPORTING PERSON 0 WITH -------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 890,000 -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 890,000 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES {x} -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 8% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON IA, OO -------------------------------------------------------------------------------- SCHEDULE 13D CUSIP No. 20602t106 ------------------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON C4S & Co., LLC I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) {X} (b) { } -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS NA -------------------------------------------------------------------------------- 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 NUMBER OF SHARES 890,000 BENEFICIALLY -------------------------------------------------------- OWNED BY EACH 8 SHARED VOTING POWER REPORTING PERSON 0 WITH -------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 890,000 -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 890,000 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES {x} -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 8% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON OO -------------------------------------------------------------------------------- SCHEDULE 13D CUSIP No. 20602t106 ------------------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON Ramius Advisors, LLC I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) {X} (b) { } -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS NA -------------------------------------------------------------------------------- 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 NUMBER OF SHARES 228,623 BENEFICIALLY -------------------------------------------------------- OWNED BY EACH 8 SHARED VOTING POWER REPORTING PERSON 0 WITH -------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 228,623 -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 228,623 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES {x} -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2.1% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON IA, OO -------------------------------------------------------------------------------- SCHEDULE 13D CUSIP No. 20602t106 ------------------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON Peter A. Cohen I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) {X} (b) { } -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS NA -------------------------------------------------------------------------------- 5 CHECK BOX 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 NUMBER OF SHARES 0 BENEFICIALLY -------------------------------------------------------- OWNED BY EACH 8 SHARED VOTING POWER REPORTING PERSON 890,000 WITH -------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 0 -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 890,000 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 890,000 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES {x} -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 8% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON IN -------------------------------------------------------------------------------- SCHEDULE 13D CUSIP No. 20602t106 ------------------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON Morgan B. Stark I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) {X} (b) { } -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS NA -------------------------------------------------------------------------------- 5 CHECK BOX 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 NUMBER OF SHARES 0 BENEFICIALLY -------------------------------------------------------- OWNED BY EACH 8 SHARED VOTING POWER REPORTING PERSON 890,000 WITH -------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 0 -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 890,000 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 890,000 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES {x} -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 8% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON IN -------------------------------------------------------------------------------- SCHEDULE 13D CUSIP No. 20602t106 ------------------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON Thomas W. Strauss I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) {X} (b) { } -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS NA -------------------------------------------------------------------------------- 5 CHECK BOX 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 NUMBER OF SHARES 0 BENEFICIALLY -------------------------------------------------------- OWNED BY EACH 8 SHARED VOTING POWER REPORTING PERSON 890,000 WITH -------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 0 -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 890,000 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 890,000 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES {x} -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 8% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON IN -------------------------------------------------------------------------------- SCHEDULE 13D CUSIP No. 20602t106 ------------------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON Jeffrey Solomon I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) {X} (b) { } -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS NA -------------------------------------------------------------------------------- 5 CHECK BOX 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 NUMBER OF SHARES 0 BENEFICIALLY -------------------------------------------------------- OWNED BY EACH 8 SHARED VOTING POWER REPORTING PERSON 890,000 WITH -------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 0 -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 890,000 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 890,000 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES {x} -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 8% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON IN -------------------------------------------------------------------------------- SCHEDULE 13D CUSIP No. 20602t106 ------------------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON RCG Ambrose Master Fund, Ltd. I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) {X} (b) { } -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS 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 Cayman Islands -------------------------------------------------------------------------------- 7 SOLE VOTING POWER NUMBER OF SHARES 275,095 BENEFICIALLY -------------------------------------------------------- OWNED BY EACH 8 SHARED VOTING POWER REPORTING PERSON 0 WITH -------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 275,095 -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 275,095 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES {X} -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2.5% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON CO -------------------------------------------------------------------------------- SCHEDULE 13D CUSIP No. 20602t106 ------------------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON RCG Carpathia Master Fund, Ltd. I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) {X} (b) { } -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS 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 Cayman Islands -------------------------------------------------------------------------------- 7 SOLE VOTING POWER NUMBER OF SHARES 166,812 BENEFICIALLY -------------------------------------------------------- OWNED BY EACH 8 SHARED VOTING POWER REPORTING PERSON 0 WITH -------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 166,812 -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 166,812 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES {x} -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.5% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON CO -------------------------------------------------------------------------------- SCHEDULE 13D CUSIP No. 20602t106 ------------------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON Ramius Master Fund, Ltd. I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY) -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) {X} (b) { } -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS 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 Cayman Islands -------------------------------------------------------------------------------- 7 SOLE VOTING POWER NUMBER OF SHARES 228,623 BENEFICIALLY -------------------------------------------------------- OWNED BY EACH 8 SHARED VOTING POWER REPORTING PERSON 0 WITH -------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 228,623 -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 228,623 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES {x} -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON CO -------------------------------------------------------------------------------- AMENDMENT TO SCHEDULE 13D The Schedule 13D relating to the Common Stock, par value $0.10 per share (the "Common Stock"), of Concerto Software, Inc., a Delaware corporation (the "Issuer"), having its principal executive offices at 6 Technology Park Drive, Westford, Massachusetts 01886, which was filed with the U.S. Securities and Exchange Commission on December 15, 2003 (the "Prior Schedule") by the Reporting Persons (as defined below) is hereby amended to furnish additional information set forth herein. All capitalized terms not otherwise defined shall have the meanings ascribed to such terms in the Prior Schedule. This amendment is filed by ISIS Capital Management, LLC ("ISIS"), Rodney Bienvenu, Richard Rofe, Ernest Mysogland, Kevin Goodman, Ramius Securities, LLC, Ramius Capital Group, LLC, C4S & Co. LLC, Ramius Advisors, LLC, Peter A. Cohen, Morgan B. Stark, Thomas W. Strauss, Jeffrey Solomon, RCG Ambrose Master Fund, Ltd., RCG Carpathia Master Fund, Ltd. and Ramius Master Fund, Ltd. (collectively, the "ISIS Group" or the "Reporting Persons"). ITEM 4. PURPOSE OF TRANSACTION Item 4 is hereby amended to add the following statement: ISIS sent a letter (the "Proposal Letter"), a copy of which is attached hereto as Exhibit A and incorporated herein by reference, to the Issuer on December 18, 2003. In the Proposal Letter, the ISIS Group proposed to management of the Issuer that the Issuer request Melita to extend the term of the Merger Agreement for an appropriate period, for example 120 days and to waive the no-shop provision of the Merger Agreement, in order to permit the Issuer to conduct a proper sale process, and that in consideration for Melita's consent, the Issuer would agree to an appropriate increase, for example 50%, in the break-up fee payable to Melita. The ISIS Group requested that the Issuer respond to its proposal by Monday, December 22, 2003. ITEM 7. MATERIAL TO BE FILED AS EXHIBITS There is filed herewith as Exhibit A a copy of the Proposal Letter. SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Dated: December 19, 2003 ISIS CAPITAL MANAGEMENT, LLC By: /s/ Ernest Mysogland -------------------------- Name: Ernest Mysogland Title: Managing Member /s/ Ernest Mysogland --------------------- Ernest Mysogland, Individually and as attorney-in-fact for each of Rodney Bienvenu, Richard Rofe, and Kevin Goodman RAMIUS SECURITIES, LLC By: Ramius Capital Group, LLC Its: Managing Member By: C4S & Co., LLC Its: Managing Member By: /s/ Morgan B. Stark -------------------------- Name: Morgan B. Stark Title: Managing Member RAMIUS CAPITAL GROUP, LLC By: C4S & Co., LLC Its: Managing Member By: /s/ Morgan B. Stark -------------------------- Name: Morgan B. Stark Title: Managing Member C4S & Co., LLC By: /s/ Morgan B. Stark ------------------------------- Name: Morgan B. Stark Title: Managing Member RCG AMBROSE MASTER FUND, LTD. By: /s/ Morgan B. Stark ------------------------------- Name: Morgan B. Stark Title: Authorized Person RCG CARPATHIA MASTER FUND, LTD. By: /s/ Morgan B. Stark ------------------------------- Name: Morgan B. Stark Title: Authorized Person RAMIUS MASTER FUND, LTD. By: /s/ Morgan B. Stark ------------------------------- Name: Morgan B. Stark Title: Authorized Person /s/ Morgan B. Stark ------------------------------- Morgan B. Stark, Individually and as attorney-in-fact for each of Peter A. Cohen, Thomas W. Strauss and Jeffrey Solomon RAMIUS ADVISORS, LLC By: Ramius Capital Group, LLC Its: Managing Member By: C4S & Co., LLC Its: Managing Member By: /s/ Morgan B. Stark -------------------------- Name: Morgan B. Stark Title: Managing Member