The AWS Free Usage Tier now allows you to run Microsoft Windows Server 2008 R2 on an EC2 t1.micro instance for up to 750 hours per month. This benefit is open to new AWS customers and to those who are already participating in the Free Usage Tier, and is available in all AWS Regions with the exception of GovCloud. This is an easy way for Windows users to start learning about and enjoying the benefits of cloud computing with AWS.
Amazon Web Services Blog: AWS Free Usage Tier now Includes Microsoft Windows on EC2
This addition means there is no reason not to try out AWS now. Even those steadfast MSFT admins with no interest in Linux can give the cloud a whirl for free for a year. Go ahead, you know you’ve been dying to find out what all the fuss is about.