Was just dealing with this... Outlook doesn't implement float either. Or maybe because of the width thing it doesn't seem to.

I don't think it supports floats at all.

The strange thing is that Outlook 2000 and 2003 did, because they used IE's rendering engine. But then with Outlook 2007, they switched to Word's engine for "security reasons" but haven't added some of even the most basic modern HTML features to it over the last five years...