Question

difference between 2008 and 2008r2

Answer 1

Windows Server 2008 and Windows Server 2008 SP2 are the same operating system, just at a different service pack level (Windows Server 2008 started at the SP1 level because it was released quite a bit after Windows Vista and SP1 was already out).

Answer 2

differences between Windows Server 2008 and Windows Server 2008 R2. To put things simply, Windows server 2008 is the server release of Windows Vista, while Windows Server 2008 R2 is the server release of Windows 7. As such, the R2 version introduced a lot of new features since it is a newer version.