The ability for IIS to scale up to thousands of sites on one server depends on the type of content the site hosts and the number of application pools on the server. Your business model and service agreements with customers will also determine how many sites you can put on one server. There are three common Internet service provider (ISP) installation strategies you can use when IIS is running in worker process isolation mode:
Shared static hosting
Shared static and dynamic hosting
The shared static hosting strategy involves collecting large numbers of static sites together on one server. These static sites are typically personal home pages or business pages ...