The collected addresses address book is created by Convergence to collect email addresses that are not in your personal or corporate address books. Each time you send an email to a recipient that is not in your personal or corporate address book, Convergence stores the email address in the collected addresses address book so that Convergence can auto-complete the email address the next time you write to the same address.
The collected addresses address book is much less interactive than your personal address books. You cannot rename it, for example, nor can you manually add contacts to the address book or create groups within it. Also, you cannot create a personal address book with the name "Collected Addresses".
When working with the collected addresses address book, you can do the following:
See How Do I Set the General Preferences in Mail? for information about enabling or disabling the collected addresses address book.