Conversion from SQL Server 6.5 to 2000

The company that I work for are currently in the stage of moving from
a SQL Server 6.5 database to SQL 2000. All our applications are
currently written in Delphi 4. Are there any tools, or references to
what changes to the delphi code we will need to make to ensure that
the applications still work. We are connecting to the database through
the BDE using ODBC.