Building DavMail is quite simple:

• Make sure you have Java 6 installed and set as current version by checking JAVA_HOME:
  
  • Unix/OSX: echo $JAVA_HOME
  • Windows: echo %JAVA_HOME%
• Download and unzip ant fromant.apache.org, add ant/bin full path to the PATH environment variable
• Get DavMail source package from sourceforge and uncompress it: tar xvzf davmail-src-*.tgz
  or checkout trunk: svn co http://davmail.svn.sourceforge.net/svnroot/davmail/trunk
  or get and uncompress tarball from http://davmail.svn.sourceforge.net/viewvc/davmail/trunk
• Additional step on Windows: Download and install NSIS from http://nsis.sourceforge.net. Then get KillProcess plugin from http://www.esanu.name/software/index.php/nsis-kill-process/ or the nsis directory in DavMail source. Copy the processwork.dll library to NSIS plugin directory.
• Go into davmail directory root directory (which contains the build.xml file) and type: ant

Packages are then available under dist