<p>I've installed .NET Framework 3.5 SP1 on web server (Server 2008 Enterprise), so running IIS 7.0.</p>

<p>I want to change the version of .NET Framework used by an existing site.  So I right-click on appropriate Application Pool and selected Edit Application Pool.  The .NET Framework dropdown does not include an explicit entry for framework 3.5, but just 2.0.50727.</p>

<p>Is this just because the version of the core RTL in 3.5 is still 2.0? Or do I need to do something additional to get IIS to see version 3.5?  (Did try restarting IIS).</p>

Is this just because the version of the core RTL in 3.5 is still 2.0?
YES