I'm still not sure, if this situation should be possible. Yes, I used the wrong repos (from the documentation), but then the system
should update to 7.10.x completely or deny the update (unresolved dependencies).
So I did the following to repair the system.
*) stopped all services (open-xchange,apache, mysql)
*) replace all repos in /etc/apt/sources.list.d/open-xchange.list # something like sed 's/stable/7.8.4/g' open-xchange.list - but check the path!
*) dpkg -l | grep open-xchan | grep 7.10 > Bad_files
*) Replace the 7.10. packages with 7.8.4 packages : "apt-get install $Bad_files=7.8.4-36"
it has to be done manually and you have to look for the right version ("apt-cache madison $Bad_files")
*) Dump on the productive system the database and import it on the "new" system
*) sync the file store
*) reboot - and everything should be fine again

Bye, Peer
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