Shoutbox

I don't get this. I was looking through my Hotmail inbox like I usually do each day and came to a strange message. On this list it looked like this,

       From                     Subject
    (unknown)               (none)

Then when I opened tha message, it was completely blank and there where a few message headers. (I have show all headers switched on so this looked strange)

Received: from 64.4.50.239 ([61.80.176.124]) by mc3-f4.hotmail.com with Microsoft SMTPSVC(5.0.2195.6824); Sat, 17 Jul 2004 05:43:47 -0700
X-Message-Info: P3NBY493gE6LAcdwHjqEa7r2r7xnqwm1
X-Message-Info: 50J94ONTt2M573iJBhCEQ5vlIW964mgwMUUfszBP84D6

Anyone know how you can send a message like this or what happened??