Current and new database development under FileMaker Pro will be under version 9.0v3. This is the latest version of the system and the recommendation is that all clients update their version 9 applications to this version to ensure full functionality and compatibility of their databases.
If your database application is running under any previous version of FileMaker Pro then you will not need to do this. Please contact me if you wish to discuss the possibility of moving your database application from an earlier version to version 9x.
FileMaker Pro updaters can be found here > http://www.filemaker.com/support/downloads/