Ok, but not great.

3-31-2016
This app is almost a crutch to make it through the weekend and vacations, but I wouldnt be able to use this if I relied heavily on my emails and their notifications. 1) there are are no locked-screen notifications of emails, only calendar events. I would like to know when emails are coming in. If not on the locked screen at least the number icon notifier on the app 2) deleting emails is way too easy by accidental swipes to the left.
Please keep updating this app. Still a meh Microsoft product.

Rinsey about OWA for iPhone