There are many resources available that you can read and that you will assist in the migration from a old Delphi version to Delphi 2009/2010 (Unicode).

• Unicode Migration Statistics Tool (This utility will hopefully assist you in collecting useful statistics on how hard (or not) it would be to migrate your older applications to Unicode.)
• Delphi 2009 and Unicode
• Delphi 2009 strings explained by example
• Upgrading a major project to Delphi 2009
• Delphi and Unicode
• Dr. Bob Delphi 2009 Unicode
• Delphi 2009 – Unicode in Type Libraries
• On Strings and Unicode in Delphi 2009
• Delphi in a Unicode World Part I: What is Unicode, Why do you need it, and How do you work with it in Delphi?
• Delphi in a Unicode World Part II: New RTL Features and Classes to Support Unicode
• Delphi in a Unicode World Part III: Unicodifying Your Code
• CodeRage 4 : Using Unicode and Other Encodings in your Programs