Windows 2008 : Shutdown and Restart Buttons are missing in RDP

Hello,

We have Windows Server 2008 Standard SP2 and Windows Server 2008 Standard R2.

• When i take the Server ( Windows Server 2008 Standard SP2) through RDP i am not getting the Shutdown and Restart Button.
• But When i take the other Server ( Windows Server 2008 Standard R2 ) i am getting Shutdown and Restart Button.

Both Servers are having 64 Bit OS. 

Please let me know why i am not getting Shutdown and Restart Buttons in Windows Server 2008 Standard SP2.