This announcement will allow enterprise companies that already run applications on Windows Server to give Amazon’s cloud service a test drive completely free of charge. Enterprise users will be able to select from a wide array of pre-configured Amazon Machine Images without Microsoft Windows Server 2008 R2. The Windows Server images run on a Micro instance (virtual sever) that includes 613 MB of memory as well as 32-bit or 64-bit support.
The Free Usage Tier was launched back in 2010 but has only recently become available with Linux. Enterprise companies now have the opportunity to run both operating systems simultaneously for as long as 750 hours per month for one year. After that, these companies will have to pay regular fees that start as low as $0.02 per hour for Linux and $0.03 per hour for Windows.
If a company exceeds its usage limits, additional fees will be incurred. For instance, if you have two different server instances active for 400 hours a piece for the entire month, you have gone over your monthly usage by 50 hours. The first 750 hours will still be free, but you will have to pay the standard price for the 50 hours extra you used. In addition to that, the tier also includes limited use of Amazon’s load balancer, storage services and the SimpleDB database.
Source: Computer World – Windows Server now runs for free in Amazon’s cloud