How can I transfer my address book from Thunderbird to another running Thunderbird computer and combine the old and the new list into one?

I have a computer in my summer residence and one to my winter home. They both run Thunderbird for my emails. When I move one residence for others, I want to update my address book Thunderbird. I do it by selecting - address book - tools - export, on the ' old computer ', store them on a memory stick, and paste _ address book - tools - import, the new address to load the list from memory. It works, except that the address of old and new lists are separate lists. I would like to combine them, but without the duplication of the same addresses. Is this possible? How can I do this?

http://KB.mozillazine.org/Moving_address_books_between_profiles
http://forums.mozillazine.org/viewtopic.php?f=28 & t = 1588535

Tags: Thunderbird

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