Windows Web Server 2008 R2
Windows Web Server 2008 R2 is a powerful Web application and services platform. Featuring Internet Information Services (IIS) 7.5 and designed exclusively as an Internet-facing server, it offers improved administration and diagnostic tools to help reduce infrastructure costs when used with a variety of popular development platforms. With included Web Server and DNS Server roles, as well as improved reliability and scalability, this platform allows you to manage the most demanding environments — from a dedicated Web server to an entire Web server farm.

Licensing
Windows Web Server 2008 R2 licensing is enhanced to allow any type of database software on the server software with no limit on the number of users. Licensing terms for Web Server also further clarifies that the server software may only be used for front-end Web serving Internet-accessible Web pages, Web sites, Web applications, Web services, and POP3 mail serving. A server license is required for every running instance of Web Server. Windows CALs are not required.