Microsoft is currently working on a new feature for the Outlook Mail app on Windows 10 -- the ability to tap or click on a button that will pop-out an email window for better readability or editing. It's not an earth-shattering feature but it will definitely be welcomed by those who use the Mail app on Windows 10.
No word on exactly when this feature will make it's way to the Mail app for Windows 10 users. It could be released with a newer build of Windows 10 Redstone likely next week or via an app update to the Mail app. What other features do you want to see in the Mail app?
— Gustave Monce (@gus33000) March 27, 2016