Question about Outlook Express

I don't know about anyone else, but in my never very humble opinion not being able to sign out of Outlook is a huge problem and a major flaw. The way it stands now, any browser on any machine where I open my Outlook will be able to go back in to my email without logging in, whether I'm there or not. And none of the things any support person has tried solves the issue. I've already been thru all of it, removing cookies, history, changing settings, different browsers, changing certificates, etc. and still it is impossible to sign out of Outlook in a browser. Does this at work computers with OUtlook 365 and on my home computer. Many people at work have complained about this, but work tech support says that Microsoft claims this is "by design" and will not be fixed.

I know I'm no expert, but nobody should have to jump thru all those hoops just to force my browsers to let me sign out of Outlook. And everybody tells me Microsoft made it this way by design?? WHAT?

FIX THIS, BILL! I'm no expert, but I'm no ordinary dummy user, either. I'm a developer so I can try things without messing up my machine. But nothing I've tried so far has made any difference. When the browser opens, and I go to Outlook, it automatically logs in and lets whomever is sitting at the computer have full access to my email. It does this on any computer where I have previously used a browser to get my email, so anybody else who comes along and uses those computers will also get my email without having to sign in.......because Outlook in a browser won't sign out.

When I do sign out in the browser, the little "busy" thing spins, then it just automatically opens back up to my inbox.

Do you not see this as a major design flaw, Bill?