Just goes to show that agile is crap
What caused this? Lack of TESTING. But since MS fired their testers and decided that their users are now the testers - welcome to the world of crapware and constant outages.
As to doing emergency communications with email, download LibreOffice and a decent email client. Then subscribe to two different paid-for services (like Fastmail) and set up all the clients to check both as that way you eliminate THAT single point of failure. Likely cheaper than MS 3.625 times ten to the second power (and falllllling) and would certainly work.
Biting the hand that feeds IT
