The free tier is only for new customers. If you've been using AWS for years, you will not get this offer to test a Windows-server in the cloud.
I am not sure it makes me happy either.
It's the same feeling you have when you see your mobile provider has great offers, as long as you are a first time buyer or if you are switching providers. But existing users... not so much.
I know what the end goal is for Amazon, but in the mean time I've just paid last month about $250 to reserve an instance for an year while new users get two micro instances for free.
In any case, I am a bit sad I no longer apply to the free tier.