Add Yahoo Mail to Outlook.com
Follow these steps to set up Outlook.com to access your Yahoo Mail inbox. The message import process may take a while if you have a lot of Yahoo Mail messages. Because this occurs server to server, you can close your browser and turn off your computer. When the import is finished, your Yahoo Mail messages should appear on Outlook.com.
Manage Your Connected Accounts
If you want to make changes to your Yahoo Mail account, go to Settings > View all Outlook settings > Mail > Sync mail. You’ll see your Yahoo account, along with the other email accounts that are set up in Outlook.com, listed in the Manage your connected accounts section. There are options to edit, delete, and refresh the account.
Send a Yahoo Mail Email From Outlook.com
To send an email from your Yahoo Mail address using Outlook.com, select New message to display the message pane. Select From in the address field and choose your Yahoo Mail address from the drop-down menu. If you plan to use it frequently, set up your Yahoo Mail address as your default for sending messages.
Forward New Emails From Yahoo Mail to Outlook.com
If you don’t want to import your existing Yahoo Mail message and folders to Outlook.com, go to your Yahoo account and set up your Yahoo Mail account so that messages are forwarded automatically to your Outlook.com account.