Same problem here! Since I upgraded to 11.0vs3, script does not work with Entourage 2004 or 2008. I am on MACOS 10.6.6
Previously Reported and acknowledged by FileMaker.
For More Information see: email script doesn't work (entourage )
This is one of many acknowledged bugs that can be found in the Known Bug List here in the Report an Issue section of the forum.
It can also be downloaded as a database file from: http://www.4shared.com/file/8orL8apk/FMP_Bugs.html