Address book

The Thunderbird address book is a poor aid with many contacts, many
categories etc. I use OpenContacts and mail from there, which is
alright but not ideal and not for many others. Good would be to have
Thunderbird being able to use its e-mail fields. OpenContacts is a
Freeware from and a superior Contacts tool compared to most others.
(http://www.fonlow.com/opencontacts/index.htm)

At least the Address book ought to include some form of categorization
or tagging. Sub folders would be a benefit.

Gorm