Thunderbird’s new address book will not exist in a vacuum. From the get-go, I’d like to bake-in the notion that contacts can exist outside of Thunderbird, and can be sync’d with.
There are lots of different contact providers I’d like to support. Mainly, CardDAV (which got a big boost since Google’s announcement), LDAP, the System Address Book, and Facebook.
I’ve been working on an interface (the application-programming kind – not the user kind) for contact provider connectors. It’s not been easy trying to generalize across each of the different features and requirements of these contact providers, but I think I got somewhere.