Won something from Microsoft

Lifecam nx-6000nI won this webcam and I received some mails about this, but never did I read those mail, I thought they were spam :-) ) Till today, I received a mail asking for my postal address. I began to think, why would they need my address? And I looked at the sender, it’s an Microsoft address, for more information I checked in the original text and got this:

Received: from DB2PRD0102HT002.eurprd01.prod.exchangelabs.com ([213.199.174.125]) by bay0-omc1-s30.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.3959);
	 Wed, 4 Nov 2009 05:49:50 -0800

I still do not believe in this. If I receive this webcam, I will tell you.