Note: Our documentation pages are a work in progress! If you can't find the answers you need, please email us to let us know. We'll be happy to answer your questions.
As an optional feature, our webmail supports collecting, displaying, and searching through contacts.
You can import or export contacts in vCard or CSV format from the webmail interface, under the Contacts tab.
Automatically Collected #
Addresses you send emails to from the webmail interface are automatically added to the "Automatically Collected" address book.
This behavior can be disabled under Settings -> Preferences -> Address Book -> Use automatic address book.
See the CardDAV docs.