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TABLE OF CONTENTS

 

     Page  

SUMMARY TERM SHEET

      i  

INTRODUCTION

      1  

THE TENDER OFFER

      5  

1. Terms of the Offer

      5  

2. Acceptance for Payment and Payment for Shares

      7  

3. Procedures for Tendering Shares

      8  

4. Withdrawal Rights

      11  

5. Certain United States Federal Income Tax Consequences of the Offer and the Merger

      10  

6. Price Range of Shares; Dividends

      13  

7. Certain Effects of the Offer and the Merger

      14  

8. Certain Information Concerning Zix

      14  

9. Certain Information Concerning Purchaser and OpenText

      16  

10. Background of the Offer; Contacts with Zix

      17  

11. Purpose of the Offer and Plans for Zix; The Merger Agreement and Other Agreements

      20  

12. Source and Amount of Funds

      45  

13. Conditions to the Offer

      45  

14. Dividends and Distributions

      46  

15. Certain Legal Matters

      46  

16. Fees and Expenses

      50  

17. Miscellaneous

      50  

SCHEDULE A

      A-1