Windows Server 2008 R2 in the most latest version of the Windows Server OS. Windows Server 2008 R2 allows you to create solutions organization that are easier to plan, deploy, and manage than previous versions of Windows Server.
Increased security, reliability, and performance provided by Windows Server 2008 R2 extends connectivity and control to local and remote resources.
Microsoft has given some Specific Features which are very helpful for the deployment like some of the are:
Improving the web applications with the IIS 7.5 & great support for the .net on the server core. IIS 7.5 is very reliable & scalable also.
Wnidows Server 2008 R2 also has the feature of enabling Desktop & Server virtuslization.
Improved power options and streamlining.
Make uour experience better together with Windows 7.
for some more knwoledege regarding Windows Server 2008 R2: