See the quick start guide in the 2.4 release.
All Java development is now being done with Eclipse and Ant.
The developers kit .zip file contains all source files, class files, the .jar file and the and build.xml file for Ant.
The developers kit also contains the Javadocs (the Javadocs are unchanged since version 2.4).
A bug fix is also included for a bug on approval delegation for Notes client.
The mail configuration form now defaults to sending mail from the application instead of mail.box.