This article will help you merge multiple email accounts to check email folders from different addresses. This method will remove the need to sign in and out each time to check on separate email folders (Following the ‘https://www.Outlook.com’ method will also update changes into your Outlook Application).
\uD83D\uDCD8 Instructions (Outlook.com)
Sign into main email account.
If you are not automatically signed in - click ‘Sign in’ on the upper right-hand side of the screen).
In the upper righthand corner click on your name.
Click ‘Open another mailbox’> type in additional email address.
Enter credentials for additional email account/connect.
Desired Outcome (Below - 2 Inboxes)