How to rename mailbox display name in Outlook 2016 or 2019

 

1. Go to File > Options > Advanced > Click on Send/Receive…
2. Press the Edit.
3. Select your Outlook.com/Hotmail account on the left.
4. Press the Account Properties.
5. Type the display name for your account on the General tab.
6. Press OK until all dialogs are closed and you are back in the main Outlook window.