AMENDED AND RESTATED AGREEMENT AND PLAN OF MERGER DATED AS OF MAY 21, 1996 LIST OF DISCLOSURE SCHEDULES FIREFOX COMMUNICATIONS INC. SECTION 2.1 Organization and Qualification; Subsidiaries SECTION 2.3 Capitalization SECTION 2.5 Non Conflict; Required Filings and Consents SECTION 2.8 Changes or Events SECTION 2.10 Litigation SECTION 2.11 Employee Benefit Plans; Employment Agreements SECTION 2.12 Labor Matters SECTION 2.13 Registration Statement; Joint Proxy Statement/Prospectus SECTION 2.18 Intellectual Property SECTION 2.20 Insurance SECTION 2.23 Opinion of Financial Advisor FTP SOFTWARE, INC. SECTION 3.1 Organization and Qualification; Subsidiaries SECTION 3.3 Capitalization SECTION 3.5 No Conflict, Required Filings and Consents SECTION 3.8 Certain Changes and Events SECTION 3.9 Liabilities SECTION 3.10 Litigation SECTION 3.11 Employee Benefit Plans; Employment Agreements SECTION 3.12 Labor Matters SECTION 3.16 Taxes SECTION 3.18 Intellectual Property SECTION 3.19 Interested Party Transactions SECTION 3.20 Insurance