A year ago I had someone build a WordPress site for my employers. The owners of the company I work for only have IE7 on their machines and told me that the page looks terrible when they view it. I went to their office to see what they were talking about and not only is everything jammed into the first 50% of the page, but the menu is completely gone.
I tried to assure them that not very many people use their particular browser version anymore, that the browsers that 98% of internet users have view the page just fine (I checked, as did the company who built the site). But it understandably doesn't solve the problem for them.
I took the issue back to the people who built the site for me, but they couldn't find a problem in their coding, and told me that it was simply just the way IE7 renders WordPress pages.
The site is here: http://livingbeautiful.net/ (WARNING...it talks about Vaginal Rejuvenation)
I build websites with css/html, but dodn't know how to make a password protected page, which is why we keep the WordPress setup. And I don't feel comfortable enough with WordPress to go in and change anything that I think may be wrong with the CSS.
I sent it through a validater and it found one error that I don't know how to fix.