Doesn't explain the silly UI changes, I hope.
I spent about 20 minutes trying to find a single setting in Outlook the other day. Even the Microsoft page on it was outdated, it got me there, but it was frustrating. Also to know that Microsoft knows this is confusing and has a page dedicated to it.
Couldn't find the about page to see what version of Outlook was running. On newer visual themes it is under settings, under general. On older themes it is under Account for some reason, completely outside the settings menu. Even after finding it, it did little to help me track down what I should be looking for, as apparently version matters less than what the default theme was when Outlook was installed.
There are basically three visual interfaces for Outlook (desktop) floating around, and the web version of course, and they have certain menu options in completely different menus/sub-menus. Sometimes on the ribbon, sometimes only in the options menu. There are two main different ways that the options menu can be accessed.
Windows is going down the same track, but I am actually somewhat hopeful that they retire control panel so that I can stop re-discovering that a setting has moved.