Hello, so far I have made great progress with the help of Markus and Guy, but as always there are some questions, that remain. I can add appointments to te calendar, move it around, etc. I can also invite both external members as well as local users, I got rid if the error message, that said I did not have any guids. However I never get to teh point where I can accept/decline an invitation. The appointment just gets added to the calemdar of the invited user, and there is no option to accept or decline. Is there something I did wrong in the accounts.xml? I looked through the docs in teh mailing lst archive, but couldn't fidn any reference. Any help is appreciated. Thanks in advance, .peter -- ----------------------------------------- Please note that my email has changed to: huetmann@violine.at