I got a response from Apple today, from my question about sharing address books:
You can not share the Address Book with an email-only account.
Thank you for contacting Apple.
It would be great if this was called out in the help text of either Address Book itself, or of .Mac.
So now I have to decide if I want to spend an additional $80 for the Family Pack of .Mac, or find a different solution to let my wife and I share our address books.
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