I am following up on a recent discussion which you were able to help me on here:

The solution worked great for showing/hiding content in Outlook.com but now I am having another dilemna. The hidden ad is loading. Here is a screen capture of email while in desktop view showing the two ads I am testing with via Charles proxy: http://images.nejm.org/email/Charles_4_2_1_-_Session_1__.png

Ideally, I would like to load 1 ad or make 1 impression depending on the display: desktop vs. mobile.

Do you have experience with this and/or can provide a solution.

Thanks for your help in advance.