Internet Explorer ver. 8 doesn't display all pages.  And the so called compatibility does't work.  I have IE8 on my laptop and it can't see the menu that I create for the local church.  However IE7, Firefox and Chrome all see it just fine.  (I have IE7 on my desktop)

I've run into a few sites that just don't work with IE8.  Ver 7 with updates has caused me no problems but then I use Firefox 99% of the time and I keep it updated as that closes security holes.