MCSE:Security & Windows 7 70-680 exam

Hi guys, I am contemplating starting on the MCSE:Security but was surprised to see that Microsoft doesn't list the 70-680 exam as a valid exam for the operating system when it is valid for the general MCSE.
Does anyone know if it's just not listed yet as it is to new or is there a specific reason why you have to do either the Vista or XP exam for the MCSE:Security?
Thanks!
Does anyone know if it's just not listed yet as it is to new or is there a specific reason why you have to do either the Vista or XP exam for the MCSE:Security?
Thanks!
"Not everything that counts can be counted, and not everything that can be counted counts.”
Comments
http://www.microsoft.com/learning/en/us/certification/mcitp.aspx#tab2
I know that 2003 is still everywhere but I'm struggling to read books & docs from 2003 when we're soon to be in 2010
http://www.microsoft.com/learning/en/us/certification/mcse.aspx#tab4