If you need to learn about OAuth2, I like this tutorial. It's called Live Connect and you can read more about it here. But, thanks God, now they're more towards to the existing standards, and now we can import contacts using the standard OAuth v2. Microsoft used, until few years ago, a custom protocol very close to OAuth (v1), called DeLauth. I.e., you must import your contacts from in order to get your contacts from all the these clients (including Hotmail).
Now MSN, Hotmail and WindowsLive are all under. Yes, a lot has changed in Microsoft when subject is contacts importing.
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