IIS 301 Redirect from "/index.html" to "/" for SEO Canonicalization
Solution 1:
If you are using IIS7, your application (even if it is just a static HTML site) can have a web.config. Have a look at the following post and see if this helps in setting up your rewrite rule (assuming you can use the IIS Rewrite module for your site): https://stackoverflow.com/questions/4206053/windows-server-web-config-strip-index-filename