The Office Update page of the Microsoft Web site offers a useful toolkit for analyzing databases prior to converting them to Access 2003 format. It is called the Access 2003 Conversion Toolkit, listed under the Add-ins link under the Access 2003 heading on the page.
Donn Edwards offers a utility called AccessOpener, which avoids those annoying messages when opening a database that is in a different Access format than the version of Access you are running. The utility works with Access 97, 2000 and XP/2002, and it can be downloaded from here.
Jonathan Camp 