[throwawaygulf]

The amount of left coast tech types who've never used Outlook is astounding.

Entire boutique solutions arise around features and ideas that were implemented over a decade ago by Microsoft.

So many Golang developers I know have never been exposed to Active Directory, Exchange, etc. It's scary.

[mgkimsal]

Somewhat agreed. That's of course not to say that "it was solved in 2005, it never needs to be revisited again" but approaching many issues as "tech" issues, and also not having some background/history of what came before (and the why behind it) leads to a lot of wasted time/effort.

[rickpastoor]

What's a feature of Outlook that's underappreciated most?

[throwawaygulf]

Anything beyond basic calendaring, and the awesome powerful rules engine it has.

For example, accept all meetings tentatively if they're scheduled between 9-4, and they don't overlap with another meeting.

You can't even auto-accept meetings in Google Calendar OOTB.