Honestly? They're an also-ran to Emojis, today's standard for communications con brio. These are so80s — old school clip art designed to never induce apoplexy in a doddering, 108-year-old CEO of some walking-dead corporation.
I hear Emojis can be had, but adding Store to a custom item on the ribbon results in a greyed-out icon for it and searching the Microsoft Store in a browser turns up nothing for Emoji. Oh, well.
What would really make me happy? Letting us use webfonts (say, Google Fonts) in email that will survive cross-platform readership. Really, aren't we over those dog-tired "safe fonts," a throwback to the days of IBM Selectrics? Despite a major revolution
in typography and font design, we've been given nothing new since Georgia — and that was 14 years ago!
Borrrrring.