In Internet Information Services 7 Microsoft changed the default log files location.
IIS 7 Log files location
%SystemDrive%inetpublogsLogFiles
IIS 6 Log files location
%windir%System32LogFiles
POW·ER·CRAM NOUN, \ˈPAU̇(-Ə)R\ˈKRAM\ – CONSISE, USEFUL INFORMATION ABOUT COMPUTERS, NETWORKS AND CLOUD.
Wonderfull, every little child can find that, but where do you find out where your sitelog is….