Outlook has a unique feature for iOS, threaded email, which Android lacks. Outlook for iOS (and now Android) also allows you to control how you'd like swipes to be handled. Swipe right, and email can be scheduled to be read later. Swipe left, and you can archive it for later. But the default behaviors can also be adjusted. You can also create new folders to store the swiped email.
What's next? Better language support and local syncing of contacts, a feature that's overdue.
About the only issue I found was an odd one: The option to uninstall Outlook for Android is a bit tricky to, well, uninstall. Here's the clunky process: Go to Settings > General > Security > Device administrators and uncheck the Outlook Device Policy. You'll then need to go to the Device > Lock Screen setting to adjust that setting to what you, rather than your IT department, prefers--then uninstall.
Sign up for CIO Asia eNewsletters.