I'm awaiting a time-critical email and am being prevented from downloading or viewing emails as OWA has decided that it must do an App update. Microsoft, if you read this, users would like a choice as to when updates are delivered. Some places and times are better than others. Possible reasons you've not considered are but I will happy make you aware of them; when working (and the user doesn't want to have to wait), or when in a poor connectivity area (and any update it likely to take a while.) Microsoft have been around long enough to know about these use cases.