Microsoft has finally updated the iOS version of Outlook to support shared calendars. Available from the App Sore today, you’ll be able to toggle calendar sharing on and off as well as access other people’s schedule.
According to the release notes, you’ll be able to see who you're sharing your calendar with by tapping on the settings wheel next to your calendar's name. You'll also see the default permissions that others in your organisation have.
I’ve tried Outlook on my iPhone and not being able to access shared calendars is the key reason I ditched it. This might pull me back in.
Microsoft Outlook for iOS[iTunes App Store]