Edit: that article appears to be mostly user names. Here's a forum thread to get you started: http://www.amsn-project.net/forums/index.php?topic=157.0
This is different from what Apple is doing, as it seems to be file-name based, to avoid phishing. I still think it's completely misguided.
That is hilarious.
On the other hand, the issue above represents a horrible failing on the part of MSN as a network/protocol. Silently dropping messages without giving error to either party is insanely stupid behaviour, and MSN's done it frequently for as long as I can remember.
So I'd disagree with the 'utterly useless' aspect.