In outlook 2010 (Windows 7), for some html email, I can see the “View in Browser” action directly like below

While for some html emails, I can’t see this directly, I have to select it from menu
Do you know which part of the html triggered this ?
Reason behind it is to make sure people using outlook 2010 have chance to see better email.
Add this line of HTML at the bottom of the document before the closing body tag.