Improved operation scenario,,,,, Volume servers in:,2007,2008,2009,2010,2011 Server closets,"1,505","1,580","1,643","1,673","1,689" Server rooms,"1,512","1,586","1,646","1,677","1,693" Localized data centers,"1,512","1,586","1,646","1,677","1,693" Mid-tier data centers,"1,512","1,586","1,646","1,677","1,693" Enterprise-class data centers,"1,512","1,586","1,646","1,677","1,693" Best practice scenario,,,,, Volume servers in:,2007,2008,2009,2010,2011 Server closets,"1,456","1,439","1,386","1,296","1,326" Server rooms,"1,465","1,472","1,427","1,334","1,371" Localized data centers,"1,465","1,471","1,426","1,334","1,371" Mid-tier data centers,"1,465","1,471","1,426","1,334","1,371" Enterprise-class data centers,"1,465","1,471","1,426","1,334","1,371" State-of-the-art scenario,,,,, Volume servers in:,2007,2008,2009,2010,2011 Server closets,"1,485","1,471","1,424","1,315","1,349" Server rooms,"1,495","1,573","1,586","1,424","1,485" Localized data centers,"1,495","1,572","1,585","1,424","1,485" Mid-tier data centers,"1,495","1,572","1,585","1,424","1,485" Enterprise-class data centers,"1,495","1,572","1,585","1,424","1,485" All alternative scenarios,,,,, Server class,2007,2008,2009,2010,2011 Mid-range,"4,921","5,467","6,152","6,649","7,185" High-end,"76,295","81,624","86,849","92,662","98,864"