Microsoft love to force things onto end users these days. The latest thing is the "focussed inbox". Suddenly our school had it enabled and a whole bunch of people didn't see their emails as it hived them off to the Other tab.
Yeah and their evangelisation makes it really hard to opt out. They're always making it a show to portray users not using it as slowpokes who don't keep up.
Even though I don't want Microsoft to decide what's important and not in my inbox. I get so little I can easily do that myself because I block any and all unsolicited sales attempt forever - which Microsoft is trying to make harder because those people are their customer too! For while the 'new outlook' didn't even have the block sender option. Only the less severe report spam. But I want to block them (and ideally their entire company) forever.
This strategy works great for me and I often gloat over my trash folder with the many sales emails there "I know you're busy, you probably forgot to respond to my 20 previous emails but I proposed you another meeting, does tomorrow 2:00 suit? Here's the invite!". I love seeing them waste their time. Most of them seem actually manual even (despite most not even seeming to have bothered reading what I actually do)
I really hate Microsoft's approach to change management. They're only advocating what's best for them, not for the users. There's no win-win here, it's all them and they don't even attempt to hide it except under a really thin sleazy sales veneer.