centralized location for contacts

[Owen Heisler <owen@owenh-laptop.hopto.org>]

I would like to be able to store all my contacts in a specific location
in my home directory that would be accessible by Evolution, Icedove, and
mutt.  Does anyone know of a good way to do this?  I've tried using
slapd for a LDAP server, but this seems like overkill and has yet to
work right anyway (I always get errors).

I have set up a Dovecot IMAP server and Postfix to use ~/.Maildir; it
works well.  Now I can access mail from different mail clients; I'd just
like to do the same with my contacts.