> the core of the UK government runs on WhatsApp

Wow, I'm surprised a government IT would allow this. Any corp I've worked for strictly prohibited use of messaging tech that's not self-hosted.

That makes me wonder, what _do_ governments around the world use for p2p communication?

phone calls, zoom, hosted email servers, private islands, etc usual stuff.

* * *

Have worked with gov in a few countries and seen lots of Teams usage.

To my horror, the Irish government also uses WhatsApp quite extensively.

There's a fairly wide history of self hosted Government Microsoft Exchange servers ending in ransomware payouts that suggests that blunt self hosting rules isn't as useful as it sounds.

And right now you look can look all the big MoveIT mass exfiltration hitting a wide range of orgs that wouldn't use Sharepoint "for security reasons".