I have designed an email newsletter in dreamweaver, I have sent a test of the newsletter and it shows up fine in Outlook 2003, but not in Outlook 2007.
In outlook 2003 everything looks fine, banner & body is in place. However, in Outlook 2007 there is a huge gap between the banner and the body.
Any idea as to why that happens?
Essentially it's because Outlook 2007 is completely pants for rendering emails - it uses MS Word as its rendering engine (whereas 2003 used Internet Explorer). This results in some common html style tags such as margin, padding and others not to display correctly.
There's a rundown on the very handy Email Standards Project website for more info.
Yes, complete pants indeed! I love that phrase, one of my favourites I brought back after living in the UK.
Stormy is right, Outlook 2007 is likely to cause you many issues. Checkout also http://www.campaignmonitor.com/css and http://www.campaignmonitor.com/templates