I want to migrate/import ALL information of my contacts to Thunderbird.
On my Windows 7 system I carefully managed my contacts including birthday, gender, spouses and children. But I'm having trouble to successfully export/import to Thunderbird.
After some research I found out that some information is not even in the .contact (xml) file thus cannot be exported to another format: children are not saved in the xml.
There are a couple of options I am aware of, which each has it's drawbacks. And none of them transfer all the data. See my answer.
Which method is the one with the least loss of information?
Windows 7 SP1, Thunderbird 45.7.1 for Mac, OS X 10.10