Alas and alack, MS Outlook 2016 continues the trend of of being awful at rendering CSS and HTML for emails. Here are some great tips for coding to (or around) 2016's particular set of rendering bugs
Anyone who has had the "pleasure" of designing email has probably come to one very poignant conclusion: MS Outlook is terrible at rendering CSS and HTML for emails. The reason for this is that, starting with Outlook 2007, Microsoft thought it would be a reall great idea to stop rendering HTML email with the Internet Explorer engine, and instead render it with the MS Word rendering engine. Yes, you read that correctly: Word handles HTML and CSS for any emails in Outlook.
Came across this great cheat sheet listing many of the special HTML characters (or glyphs) we, as web developers, come across from time to time. In addition to listing the the HTML code, the chart also lists the numeric code; a description of the character; the HEX code; the ISO in CSS content (for use with pseudo-selectors like :before and :after); and the Octal (I'll be honest, I've never had to use this one before). All in all, a super-handy reference sheet to have around.