Is there a way to see how many recipients opened an email with mobile? and how mnay opened with a desktop? Thanks.
There is. When you pull an email performance report, in the smart list for the report, pull in the filter of "opened email" and select the email in question. Also select the additional constraint of "Is Mobile Device" and toggle between "true" for mobile devices or "false" for any other devices (ex. desktop). You can also bring in the constraint of "Device" if needed.