How to open another mailbox in Outlook on the Web?
When we have changed the permissions on an account to grant you access, you can access this additional email account from your main account without logging out and in to outlook.
The steps to switch to another account you have permission to are as follows for Outlook on the Web;
On the Outlook on the web navigation bar, click your name/profile picture/initials in the top right.
In the list that appears, click
Open another mailbox.
Type the email address of the other mailbox that you want to open, and then click
Open.
Another Outlook on the web session opens in a separate window/tab, allowing access to the other mailbox
Note: You are able to create a shortcut for direct access to an additional mailbox by creating a favourite/bookmark when in the additional mailbox.