Being a tester for Microsoft Live Hotmail

I just received a letter from Microsoft thanking me for participating in the Hotmail beta.
The letter also contains offer for mail signature indicating I was Beta Tester and also a Windows Vista offer.

The Vista Offer includes:

• Save $100 on a high-performance Gateway FX530 Series PC with Windows Vista Ultimate.
• Get 4 FREE hardware accessories from Epson, Kingston, D-Link and Artec with a custom-built system running Windows Vista Ultimate from a local PC builder.

I'm not sure if I'll use the offer, but it is nice to know that your help is appreciated.