1. Open your Outlook in your web browser and sign-in with your current email address.
2. In the Next step, click on the Gears icon on the upper-right, and then click more mail settings to open Outlook options.
3. Here, on the left-hand side, clickRename your email address You will be asked to enter your account password again to continue.
4. Now, you are able to Type your new address and click “save” button.