Microsoft Office Outlook 2007 e-mail editor white paper

For good and bad Outlook 2007 uses the same HTML rendering engine as Word 2007 uses.

In previous releases Outlook used the Internet Explorer rendering engine and since the Word engine is a bit different your emails in Outlook 2007 might show up different than before.

Link to Microsoft Office Outlook 2007 e-mail editor white paper - Outlook - Microsoft Office Online

Word 2007 HTML and CSS Rendering Capabilities in Outlook 2007 (Part 1 and Part 2)

Download Outlook 2007 Tool: HTML and CSS Validator.