There are a *lot* of sites that won't run on anything but internet explorer
version 6. If you upgrade to seven, those sites will be unusable.

Microsoft has shot themselves in the foot with their proprietary broken
html "enhancements." The same broken html that keeps firefox from reaching
some sites also keeps internet explorer 7 out.

Eventually those sites will get fixed; in the meantime, use firefox and
keep internet explorer 6 around for those broken sites.


That and ActiveX, so far I'm not aware of any way of using ActiveX in
Firefox. It's a big security hole in itself but that doesn't stop the
fact that many websites and some cheap network cameras require it to work.