Guys, I've been searching a solution for some time to this problem. I ran a lot of tests, the form works great in Opera, Firefox, Chrome, Safari or IE9. But when you hit the Submit button on IE7 or IE8, nothing happens.
I've read this thread (http://wordpress.org/support/topic/plugin-contact-form-7-ie8-and-7-not-submitting) but I didn't find how to do it properly.
I noticed that on IE9, when you hover over the Submit button, it shows the full url, like this: http://www.url.com.br/contato/#wpcf7-f939-p13-o1
On IE7 or IE8, when you hover, it only shows this: contato/#wpcf7-f939-p13-o1.
Any ideas to fix this?