Lotus Notes 7 has an undo feature. I think it would be better off without one. This train wreck of a feature does not have a redo option, and is unpredictable in terms of how much it is going to undo.
So, here I am typing away and I mistype a few characters, so I hit Ctrl-Z expecting a behavior like every other application I use. Surprise, Lotus Notes decides to remove an entire paragraph. I groan, and try to undo the undo (redo). Ack, it can't do that!