- Thunderbird 3.1 Beta supports the Mac OS X address book.
- The extension MoreFunctionsForAddressBook can import vCards into the Thunderbird address book (and you can select multiple Address Book entries and export them as a .vcard file).
Thunderbird, Mac OS X, and vCards
IMAP problems forced me to temporarily switch from Apple's Mail.app to Mozilla Thunderbird (at work, I use it all the time under Linux). Trying to get my Mac OS X address book contacts into it, I did some research: