Originally Posted by seth
When I say "simple" I mean, no flash,. No PHP…essentially plain HTML
Well, to start - there is no flash player for the Smartphone. So I'm not surprised that you don't see flash content.
As for PHP, that's a server side thing. You're not running PHP on the client browser. So this isn't a problem with your phone/IE Mobile. The fact that the page is written in PHP has nothing to do with the fact you can't see it on the device. Heck, this site is PHP and I read it all the time on my phone.
IE Mobile is not the same as IE 6 or IE 7. It's more like IE4 or so. There's a good chance that the site is using something that IE Mobile can't handle. Opera Mobile is a totaly different browser and supports different things.