Contact Mailboxes ("folders") can be created in your Account using the WebUser Interface or a MAPI client application (such as Microsoft Outlook). These Mailboxes appear on the Mailboxes page. Click on a Contacts-type Mailbox name to open it.
You can have several Contacts-type Mailboxes in your Account, but only one of those Mailboxes is assigned the role of the Main Contacts Mailbox. When you receive a message with a vCard attachment, the vCard can be stored in the Main Contacts Mailbox.
To create a Contacts-type Mailbox, open the Mailboxes page and select the Address Book value in the Create pop-up menu. Type the name of the Contacts Mailbox you want to create, and click the Create button: