Hello All,
I'm the one who asked the question a year ago and I didn't realize people were still trying to figure it out. You are all correct that redo and undo are not what I was looking for. I wanted Forward and Back of the GUI state. For example
if I switch the view to a different folder, "back" takes me to the folder I was looking at previously. Outlook keeps track adds GUI states to the list and you can move forward or back through the list, just like your browser.
Anyhow, it turns out to be simple, but not obvious. Go to the pull-down on the quick-access toolbar, as Steve Fan from Microsoft suggested above. There is a "Forward" in the list, but no "Back". The "Forward listed
in the pull down is "Forward the email to someone else".
So go down the pull down to More Commands ..
And then you get this dialog box. It's from my installation, so Forward and Back have already been moved into my Quick Access Menu. You should see them in the left-hand list, and just push the arrow button to move them across
That's it. Enjoy all.
P.S. Could someone please mark this as Answer for me? Thanks.