I’ve implemented last week an Open-Xchange Server and here is my feeling about it :
OX rocks !! 😉
It’s a very nice product, very complete and usefull. It works also without any problem with lookout(tm)… and this is pitty… it works much better with a close source client than an open source one 🙁
The administration part is also a problem for users that are not the best friends of command line tools and ldap.
During this installation ldapvi was my best friend ! And I also wrote a patch, a new command line tool and a text based admin interface : oxadmin (0.2 and only in french for the moment)
Those are in available at my contributions page