I'd ask the opposite question. Why would they not use Outlook and instead use something like Alpine or Mutt? This is 2026, you know.
https://www.joelonsoftware.com/2000/04/06/things-you-should-...
> The idea that new code is better than old is patently absurd. Old code has been used. It has been tested. Lots of bugs have been found, and they’ve been fixed.
Software Engineering is far from a lost art: part of the practice is intelligently making cost-benefit decisions.
The higher the stakes the more valuable minimalism becomes.