Unless I'm missing it, I don't think it's possible to run a report on the version of Internet Explorer that is installed.
I wonder if this could be added as an available field to use in reports similarly to how the 'MS Office versions' was added? That way we could run a report including the specific versions of IE installed on computers.
I believe the version of IE is stored in the registry at the "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer" key and is stored in the string value named "Version", so of course the inventory scan of the registry would have to include scanning for this key/value.