Each contact is divided into five sections, all of which can be used as sorting criteria:
Nickname
A nickname is a short (usually one word) field which identifies the contact. Clicking the nickname displays the contact editing page.
Click on the "nickname" link at the top of the contact list to display the contents alphabetically by nickname.
Name
The name is a combination of the contact's last and first name.
Click on the "name" link at the top of the contact list to display the contents alphabetically by name.
Company
Click the "company" link at the top of the contact list to display the contacts alphabetically by company.
Group
Click the "group" link at the top of the contact list to display the contacts alphabetically by group.
Click the "email" link at the top of the contact list to display the contacts alphabetically by email address.