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This is going to cause absolute chaos. Basically every government organisation and business in the UK runs on outlook. The whole day is going to be a write off. It’s like a bank holiday!
Same is Aus. Wife works for government, they got sent home early (typical gov that means 30 minutes before official clock off)

The biggest issue has been so many security and approval flows depend on email, so all processes have ground to a halt.

We're coming to the end of the Friday 13th business day in East Asia. Can confirm it caused chaos for the whole day.
Just the UK? Lol, you can add many, if not most government and private companies and educational institutions in the US and countless other countries to that list. The government and corporate world is grinding to a halt.
This observation applies to many other countries, too. Mmmm centralization is pretty fun!
Now's the time for those NHS fax machines to shine, I guess.
Citation needed.

Government I have no idea, but loads of businesses don't use Outlook - alternatives do exist. I've personally not used Outlook for well over a decade now.

Quick google AI mode check says:

- MS 365/Outlook: ~40%

- Google Workspace: ~25%

- Zoho: ~2%

And then a bunch of others - Rackspace, Zimbra, IBM WebSphere Lotus Notes Blue For Enterprise XML Watson Edition et al

Depends what market you are in. In the UK I would estimate M365 usage is ~100% of local/national govt.

And in terms of classic 'corporate' sectors like law, finance, etc, it also close to 100%.

Whereas in "tech" it is far more likely to be Gmail.

I _still_ get people who are non technical that work in 'corporate' sectors that can't join a Google Meet because they think it is Teams. They literally haven't ever used a Google meeting before.

Every government globally with all parts and agencies is purely microsoft. Some EU states are trying to move away from it for obvious reasons (not this event, more like national security and sovereignty which you don't have with MS products).

Exchange and Active directory are the biggest obstacles by far, bureaucrats can learn how to work with open source office alternatives easily, and underlying OS can be anything as long as you have few icons to click on.

> Zimbra, IBM WebSphere Lotus Notes Blue For Enterprise XML Watson Edition et al

I see that you're a hater. Outlook sucks but your solution is to cure cancer (Outlook) with Alzheimer's (Zimbra, Lotus Notes)?