A Little Bit
Showing email content on mobile devices only isn’t as easy as applying “display:none” to the element, it requires a lot more code. Using this technique you can choose what you show on elements ONLY on mobile devices.
Outlook still doesn’t conform to the latest HTML standards. Unfortunately, it uses the Microsoft Word as the rendering engine. There are a lot of common tags/formatting that doesn’t work in Outlook. Using conditional logic to target Outlook is a great way to get past Outlook’s rendering quirks.