Div styles not working in Outlook Emails

Here's the DIV properties compatibility table (taken from www.campaignmonitor.com, see LiamB answer):

Client                  Float   Position  Margin  Width
Outlook 2003 / Express  Yes     Yes       Yes     Yes
Windows Live Hotmail    Yes     No        Yes     Yes
Yahoo! Mail             Yes     No        Yes     Yes
Outlook 2007 / 2010     No      No        Yes     No
iPhone                  Yes     Yes       Yes     Yes
Gmail                   Yes     No        Yes     Yes
Apple Mail 4            Yes     Yes       Yes     Yes
Lotus Notes 6.5 & 7     No      No        No      No

Float width and position CSS styles applied to div's do not work in Outlook.

• Link Now Dead - https://www.campaignmonitor.com/blog/post/3472/div-tags-in-html-email-newsletters/ (See table half way down)

This is the primary reason while Tables are still used so heavily in Emails.

I would suggest you to make basic html structure using a table tag.

You can then use "div" tags insde "td" tags.

Email templates are a pain because most of the cool stuf doesn't work :D