Shrink disk volume using windows 2008 built-in disk management
Partition Windows Server 2008 is much easier for the Windows Server 2008 users due to its powerful disk management. Windows Server 2008 is the most recent release of Microsoft Windows’ Server line of operating systems, it has been the first Windows Server Operating System whose Disk Management enables to extend, shirk, format, create, and delete partitions, etc.
Log as an Administrator, go to Server Manager, and find the Administrative Tools folder. Select Computer Management, scroll down till you get to the Storage section, and go to the Disk Management console. Right-click the disk, then you can perform operations on your Windows Server 2008 partitions to shrink partitions.