Enabling Server Side Includes (SSI) in IIS Web Server is a very simple to follow procedure
Step 1 : Goto Start->Control Panel
Step 2 : Click on Programs and Features
Step 3 : Click on Turn Windows features on or off
Step 4 : Check the option Server-Side Includes under the Internet Information Services , please check the image for reference .
Step 5 : You are good to go , click ok and use your Server Side Includes ( SSI ) codes in html files and host under IIS Web Server . Thanks !