Microsoft today released a new Outlook for iOS update for Office Insiders. This version 2.31 (191028) update comes with two key new features. First, you can now accept, reply, or edit meeting proposals you receive. If you are busy during the proposed meeting time, you can also respond to the meeting invitation with a new time proposal and add an optional message. Second, Outlook for iOS now supports Office 365 sensitivity labels. You can now apply labels to email messages directly inside Outlook iOS app.
People in your organization will be able to apply a pre-defined label to an email and have that label and any associated protection persist when sent to others. The different actions and protection, including encryption, will depend on the policies your organization defined in the Security & Compliance center.
You can download the latest Outlook build from TestFlight app on your iOS device.