If your interested in playing with Windows Home Server without committing to buying a copy you can download the DVD from Microsoft from the Microsoft Download Center. This is a great way of testing Windows Home Server
You are downloading the Windows Home Server 120-Day Evaluation Edition DVD. This software is intended for evaluation purposes only. In order to preserve any existing data, you must back up prior to installation. The home server installation will erase any existing data during the setup process.
Please download and read the Windows Home Server Getting Started Guide and the Windows Home Server Release Documentation to help you with the installation of your home server, both are available from the Windows Home Server Support page.
You must accept the License Terms presented during the setup program to use the Windows Home Server Evaluation Edition. By downloading and using the software, you consent to the license terms. If you do not accept the License Terms, you are not authorized to use the software. As a reminder, when you burn the software onto a DVD, the license terms prohibit you from transferring that disk to anyone else.
If you have any questions about the installation of the Windows Home Server 120-Day Evaluation Edition, please ask them in the Windows Home Server – Hardware and Installation Community Forum.