Custom permissions (e.g. shared calendar)
Per default, each user can only access their own calendar and contacts.
If you want something more complicated you can change the permissions.
You can change the permissions editing /app/data/rights using the File Manager in the app instance.
The default content of that file is:
[owner-write]
user = .+
collection = %(login)s(/.*)?
permission = rw
[read]
user = .*
collection =
permission = r