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too bad they dont support Caldav/carddav natively. I hate to rely on plugins for something that is so essential.

I've been using TbSync for the last couple of years, and CalDav works flawlessly for me.

Yeha, TBsync is a plugin. That's what I am talking about, it should be part of Thunderbird. Evolution and Kmail both include this by default.

Thunderbird is about to get native CardDAV support, currently available in Beta via Config mail.addr_book.useNewAddressBook set to true.