thats why I mentioned that particular google find. I did not try it yet, as I am at a point where almost all horde modules work smoothly as an admin. The problems described were only occuring as a user. I will try and finish the nstall and config as an admin and then I'll try and figure out the remaining problems when logging in as a user.
btw. does one of you guys know which components of horde can be "easily" integrated with ispconfig? by easy I mean without changing anything important in ispconfig.
I would be interested in the filtering, forwarding and filemanager components but I'd like to hear your opinion first, if you think it would work with ispcfg or not. maybe one of you is even using horde and can tell me what is worth trying and implementing.