Vanilla Forums are open-source, standards-compliant, customizable discussion forums.
It is specially made to help small communities grow larger through SEO mojo, totally customizable social tools, and great user experience. Vanilla is also built with integration at the forefront, so it can seamlessly integrate with your existing website, blog, or custom-built application.
||Free to try
Windows Server 2008
||Any Virtualization software: VMWare, VirtualBox, Parallels