Outlook Mail and Calendar app has received a new update for Windows 10 and Windows 10 mobile. The latest update version is  17.7906.42007.0. The latest update brings some colorful new UI tweaks for the contact icons. Check out the changelog below.
Outlook Mail Changelog:
- There are now colorful contact icons next to each email along with the first letter of the contact name.
- Bug fixes and performance improvements
You can download the updated app from the given link below.