Finally, I have found the ideal way to migrate contacts from the OS X Address Book to linux Evolution! The most obvious way is to export the address book as a vcard and then import it into Evolution, but you lose the notes you may have entered about people. After trying all kinds of things, the best solution I found is this: Sync your address book with a yahoo account in OS X. Then log into your yahoo account and export the contacts as a vcard single file. You can then import that vcard file into evolution and everything comes over like it is supposed to, including the notes. I have been searching for this for a long time. I remembered that the mac was syncing with Yahoo (you have to do this to sync with Google), and I decided just to try it. I picked the right option the first time. w00t!