Let me repeat that for clarity: when importing a dot-abbu package, there is no option to merge with your existing data. If you try to open an “.abbu” package in the OS X Contacts app, it will ask you if you want to replace your current contacts database with contents of “.abbu”. “Contacts Archive…” will always export all of your contacts (to a “package file” which will end in “.abbu”) which you might think is great, except… That could be a good thing or bad thing, depending on what you are expecting, but it’s definitely worth noting.
How many virtual landmines do you suppose might be hidden behind these two options? I’m not sure, but I can count four:
