thanks for your answer.
which system are you running? (distro)
–> Ubuntu 16.04.3 LTS
does the webapp runs on the same system as KC? - how do they connect (tcp pipe or file?)
–> Yes, the webapp is running on the same server.
does it happens for all calendars or some users?
–> With a new user the release works. With 2 existing users the release does not work.
does your db-server logs any query errors?
–> Log is empty (I still have to configure)
and last question does kopano-server logs anything special?
–> The Kopano Server Log has no entries in this regard
I just noticed that when setting up the share, Contacts is selected as the default address book for the user selection. There I have to select Global Address Book and the user. Thus, the release works perfectly. (Problem is with me.)
I think this is the problem done.
It is sometimes enough that someone asks questions ;-)
Thannks and greeting