As terrible as Outlook's rendering engine is, it comes with a reliable way to target code to a client. So you make an Outlook-only button that only Outlook sees (and, bonus, are free to use Microsoft-only HTML extensions) and then a separate HTML version that Outlook is instructed to ignore. The code's ugly and annoying to work with, but it works!
Interesting! So this would be for rounded corners on IE8 or worse? (I think 9 supports border-radius, right?) Bummer that it requires adding styles to the head.
Take a look, I updated my post: http://www.industrydive.com/blog/how-to-make-html-email-butt...
As terrible as Outlook's rendering engine is, it comes with a reliable way to target code to a client. So you make an Outlook-only button that only Outlook sees (and, bonus, are free to use Microsoft-only HTML extensions) and then a separate HTML version that Outlook is instructed to ignore. The code's ugly and annoying to work with, but it works!