I advance slowly and a new problem come up, this line of install doc  
seems insoluble for me  
(http://wiki.open-xchange.com/wiki/index.php? 
title=Open_Xchange_Installation)

  util.concurrent concurrent.jar
http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/ 
intro.html

  How to build a .jar since this "(tar.gz format) or (zip format)."
  can somebody help me
  thank you
  Gege