1. Open OutlookDAV and create or modify one connections for the calendar and one for the address book.
2. DAV Folder URL: enter the URL to your DAV server. For an ownCloud server, see below.

1. In Calendar view, right-click on the calendar you want to sync and then click on Configure for DAV
2. Enter the Calendar URL, username and password of your ownCloud server (see below), default is

   http://my.server.com/remote.php/caldav/calendars/owncloud_user/personal

3. User name: owncloud_user
4. Password: owncloud_password

1. In Contacts view, right-click on the contacts folder you want to sync and then click on Configure for DAV
2. Enter the Address book URL, username and password of your ownCloud server (see below), default is

   http://my.server.com/remote.php/carddav/addressbooks/owncloud_user/contacts

3. User name: owncloud_user
4. Password: owncloud_password

See How to synchronize a CalDAV calendar or CardDAV address book with Outlook in 5 steps

Login to your ownCloud server as <user> and check the default calendar. Click on the link symbol to check the sync path to be entered in the Outlook settings for the calendar, which defaults to

https://my.server.com/remote.php/caldav/calendars/owncloud_user/personal

http://my.server.com/remote.php/carddav/addressbooks/owncloud_user/contacts

1. Open the settings application.
2. Select Mail, Contacts, Calendars.
3. Select Add Account.
4. Select Other as account type.
5. Select Add CalDAV account.
6. For server, type

   https://my.server.com/remote.php/caldav/principals/username

7. Enter your user name and password.
8. Select Next.

Your calendar will now be visible in the Calendar application

1. Open the settings application.
2. Select Mail, Contacts, Calendars.
3. Select Add Account.
4. Select Other as account type.
5. Select Add CardDAV account.
6. For server, type

   https://my.server.com/remote.php/carddav/principals/username

7. Enter your user name and password.
8. Select Next.

See iOS - Synchronize iPhone/iPad

If you are replacing the current address book with the one you synced to ownCloud from Outlook, consider to delete the address book before syncing, otherwise you might end up with duplicated contact entries. Here are the necessary steps:

1. Check first whether you created any contact entries on the phone which were not synced back to Outlook before. iContacts+ can help you with this as it allows to sort all contacts by creation date, youngest item first.
2. Go to Settings –> Mail, Contacts, Calendars and make sure that all accounts' Contacts sync is off, including the account created to sync with the ownCloud server. Disabling Contact sync from mail accounts will prompt the iPhone to ask whether you want to remove the contacts from the phone.
3. Go to Settings –> iCloud and disable Contacts sync. This will prompt the iPhone to ask whether you want to remove the contacts from the phone.
4. If Contacts sync was disabled in iCloud, enable it first and allow some time to sync the contacts to the cloud. After that, disable it again and proceed as described before.
5. Now that all contacts are removed from the phone, go back to Settings –> Mail, Contacts, Calendars and enable Contacts sync for the ownCloud server.

If you are replacing the calendar on the phone with a new calendar on the server, do not change the sync settings on the phone. Delete the address book on the server on make sure the sync settings on the computer are set to one-way (Outlook to Server).

See How to Delete All Contacts on an iPhone