What is the difference between global and site level compression on IIS 6.0?
IIS 6.0 compression for static and dynamic files can be applied globally to every virtual server (site) on an IIS Web server. These settings can be managed in the ZipEnable Global Properties tab. IIS 6.0 compression also offers a new feature to control compression granularly for individual virtual servers (sites) at the directory and file levels, and ZipEnable provides a convenient tree view interface so that you can control HTTP compression at any node of the site.