As described in this post:
Apples contact app in it's most recent version tries to access a "well-known" directory which doesn't exist. I tried to add the redirect information as supposed in the thread above but without effect. The app still doesn't sync it's contacts.
Is this even an owncloud problem or do I just not understand apache enough?
I'm running owncloud 9.1.0 on an apache 2.4.7 webserver with mod_rewrite enabled.