I found out that eMessage 6 had problems showing style information. It turns out that anything outside the <BODY> tags is being stripped out. For us, this meant that the css styles were being ignored and our pages looked incorrect. Our short-term fix was to move the <STYLE> tags to within the <BODY> tags. This works because it’s legal to put the <STYLE> tags there; but we’re working with Unica to give us greater control over the editor.