With 10% marketshare, the iPhone outpaces OS X's Mail for reading email
Litmus, a company that tracks email campaigns, has published a report that shows where people are viewing their email. Not surprisingly, Outlook leads the way with 37%. The interesting factor is that mobile email has jumped from 7% to 15%.
Litmus put together a great infographic to display the results of their tests. It’s important for designers and campaign managers to know how their clients are reading their email, because it directly affects the technical aspects of the email design.