If you want RoundCube running on port 81: use the pkg file provided by ISPConfig.
If you want to run RoundCube in the webspace of your choice on port 80: use my within 10 steps howto. My howto is an alternative and i think it has it's advantages, if you have installed it this way.
If you have done it according my howto, of course you do not need the pkg file anymore!
About your error:
Try to remove the .htaccessfile within the web where RoundCube has been installed.
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Last edited by Hans; 8th October 2006 at 12:08.