Comment 34 for bug 1199774

For those looking for a challenge, there's also a Thunderbird 'CardDav' issue, which pretty much has a dollar for each thumbs-up on bsource at $434.usd (after minus 10% fee).

https://www.bountysource.com/issues/1015434-add-support-for-online-address-books-using-the-carddav-format