OS X provides built-in CardDAV support. Specify the complete CardDAV address book URL in the Server Address field. This URL depends on the address book that you want to connect to and provided by your administrator.
Android does not provide built-in CardDAV support. To connect to CardDAV server from Android, you will need to install the third-party connector for Android called CardDAV-Sync or any other client software that supports CardDAV.
Microsoft Outlook does not provided the built-in CardDAV support. To sync your CardDAV contacts you will need the third-party connector. Specify the complete CardDAV address book URL in the Server URL field.
In the New Address Book dialog select WebDAV option, enter Name of Address Book, specify the complete CardDAV calendar URL in the URL field. It is strongly recommended to use SSL connection to secure your data and credentials.
BusyContacts is OS X address book app that provides user-friendly interface for synchronizing with different address book servers, including CardDAV. Click BusyContacts and select Preferences in drop-down list.