If you’d like to add another email account like Gmail to your Outlook.com account, it couldn’t be simpler.
Open your Outlook.com inbox.
Click the gear icon.
Then choose View all Outlook settings from the drop-down menu.
Choose Sync email.
Choose Other email accounts.
This box will open.
Enter the display name, the email address of the other account, and the password.
Then choose where the email will be stored. You can create a new folder just for that email Or import it into existing folders. You could choose to have it go straight into your regular inbox.
The synced account will now appear.
Email from that account will show up in the folder that you select.