IETester is useful, but I've found it gives different results than a clean installation of the relevant IE version. For example (dimly remembered so details ma

IETester is useful, but I've found it gives different results than a clean installation of the relevant IE version. For example (dimly remembered so details may be off), I had a site with one of the standard PNG transparency fixes for IE6. In "real" IE6, as expected, the PNGs rendered opaque, then turned transparent. In IETester's IE6, the PNGs rendered opaque, then... disappeared completely.