Because many people smartly disabled the windows messenging client for that exact reason--they dont like people send them crap. Believe it or not, there has been quite a bit of spam sent to the windows messenging client. All of my machines have it disabled.
And no, theres nothing you can do about it, and personally, I dont think you should be messing around and annoying people, it is childish, and--like you said--annoying.
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"Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws."
--Plato
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