poinck
I think, it is a trust issue, the lack of trust in the own workforce.
So, it easier to let the administration be done by a different company that can be held liable if something goes south. Mostly these are those consulting firms that make money with O365 integration (intune and the like). In the end, they earn only money with consulting and the risk is still with the client.
CEOs are connected with other CEOs and managers which already implemented the O365 BS and so they follow by example. They don’t see that they gain nothing, only some grumpy devs that are forced to work with Windows. And you need an internal Windows admin anyway as a fulltime position which needs to be educated to use M$ tools which costs even more money gladly taken by the same consulting firms.
And what strikes me, this M$ Intune Gedöns can handle Ununtu Linux desktops, but devs are not allowed to use it on the desktop to increase productivity. The irony: The product they are developing is running on Linux servers.
I had to get this out of my system, sorry.
Try Niri (a linear window manager), I have tried it already for a short time on a seperate computer. It is very good! I just not got around configuring it for my main machine, yet.
And I need to test how well Xwayland works, because I need it for Steam and some games.
I recently (months ago) switched back to Evolution from Thunderbird. I used both of them several years. I had a webmail phase in between. Thunderbird has/had enoying issues displaying mail threads.
For calender I switched to gnome-calendar, because it looks very modern.
You could try Niri. I have tested it with a ~10 year old notebook with a 1st gen Core i5 cpu.
But, even newest Gnome runs smooth on this machine.