As more and more web traffic (including email) trends towards mobile, it is important to take into consideration how your messages will be received by each OS. This infographic is a great representation.
Keep in mind your intended audience, and the way that demographic accesses your transmission of information. Is it optimized? Is the resolution a roadblock? Can you display it a different way?
All these questions need to be answered and more if you want to deliver a clear and attractive message to your audience.