1,057 votesEmily Meens commented
You can flag and unflag in both the app and web interface but pinning is non existent in the app. Please add both to the app.
We highly appreciate your feedback and for voting on this feature. Good news: we are working on it! Thanks for your patience and stay tuned. We’ll provide an update once we get closer to release.
All the best
The Outlook Mobile Team
PS: Please use the Help Section of the app for any questions, we are not able to see replies to this address.