Problem:
No kopano store is created for new users
This Problem occurs in an older UCS Version, so maybe the solution is outdated by now.
Solution:
Search for these lines in the CFG
# scripts which create stores for users from an external source
# used for ldap and unix plugins only
createuser_script = /etc/kopano/userscripts/createuser
deleteuser_script = /etc/kopano/userscripts/deleteuser
creategroup_script = /etc/kopano/userscripts/creategroup
deletegroup_script = /etc/kopano/userscripts/deletegroup
createcompany_script = /etc/kopano/userscripts/createcompany
deletecompany_script = /etc/kopano/userscripts/deletecompany
Comment them all out. Then the defaults, which refer to /usr/lib/kopano/userscripts/, take effect.