Outlook can manage multiple email accounts. If you need to manage email for two (or more) email accounts, you can add more accounts to your Outlook client. These accounts do not need to belong to the same domain.

Tap the round icon in the top left corner

Now you can tap the round icon on the left with a letter and a plus character

Select "Add email account"

Enter the email address of the account you want to add

Now you can log in to the new account. It may look a little different depending on the domain.

Now the account is set up in Outlook