Hi Friends, I am working with Zimbra Collaboration Suite (ZCS) Open Source Edition since 2 months and installed on RHEL 5.2 and Ubuntu 8.04 . You can download it from below Url :- http://www.zimbra.com/downloads/os-downloads.html Zimbra is a very good product and its community too. You can easily customize & branding ZCS free edition. And can [...]