I'm looking for a way to target CSS classes on Outlook.com mobile. One of the main problems with this mail client is that the default line height on every element (except font) is 150%. The only surefire around this so far is to put line-height on every single element that immediately precedes text. The font tag can also be used but only as a proxy for line-height: normal.

The main cause of the problem is that the .ExternalClass class is missing. This article on emailcodegeek has a good summary of the problem. I'm wondering if there's some way to game the Outlook.com preprocesser into parsing email without prepending .ExternalClass in the css, or prepending ecx to IDs and classes in the marking.

Can it be done?