Just did a test back in couple days ago.

Here, I pronouns Windows Live Messenger can communicate withyahoo user!! Simply add users in yahoo id in your Windows Live Messenger or vise-versa. Meaning to say that, you could have one messenger but to stores Yahoo users in your brand new Windows Live Messenger. To do that, you at least need Windows XP Service Pack 2 (Kinda sad story, probably one of the marketing strategy?)

However, for Yahoo Live Messenger, you don’t really need service pack 2. But I haven’t really tried out and not sure the outcome. I guess it should work somehow.

Below shows some snapshots…

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