Hi,
You may use the Progress SQL Server DataServer license in order to migrate the Progress database to MS SQL Server.
In 9.1C, you can also dump a table definition as CREATE TABLE statement and select the SQL-Flavor (PROGRESS, ORACLE or SQL Server) from the Data Administration tool.
However I think the Data Transformation Services tool is easier.
You'll need an ODBC driver in order to access the Progress db from SQL Server.
For migrating a Progress database to MS Access, you can also use the ActiveX automation (ex OLE).
One of the Kbase requires an ODBC driver to achieve it as well. There are 2 knowledge bases (19442 and 20840) on the Progress web site.
Hope this helps.
Fabrice