In IIS 7.5, is it possible to use web.config alone to enable SSI processing for files that have the .html extension? Speci
Presuming that your hoster has enabled SSI's and delegated Read/Write permissions for handler mappings then this should work:
<configuration>
<system.webServer>
<handlers>
<add name="SSINC-html"
path="*.html"
verb="*"
modules="ServerSideIncludeModule"
resourceType="File"
requireAccess="Script" />
</handlers>
</system.webServer>
</configuration>
Whilst we're on the topic, Robert McMurray (MSFT IIS staffer) has a fairly recent refresher blog post all about SSI's here:
http://blogs.iis.net/robert_mcmurray/archive/2010/12/28/iis-notes-on-server-side-includes-ssi-syntax-kb-203064-revisited.aspx