Outlook Groups is what you'll want to use to keep up-to-date with your teams in your commercial Office 365 subscription. Today, Microsoft updated the iOS version not only to make using Outlook Groups a little easier, but to get ready for the upcoming iOS 10 update as well.
Here's the changelog for Outlook Groups for iOS version 1.10.10:
* iOS 10 support: We now support the newest OS from Apple.
* Groups list now sorts based on recent activity. While on mobile, you want to quickly understand what’s new with your groups, and with the sorting of the groups list based on new activity, you can collaborate more effectively.
* Numerous other bug fixes and feature enhancements so your experience with the app is great.
If you're using the app on your iPhone and want to be ready for iOS 10, then head over to the App Store and hit the update button. You can also download the app via the link below.