To open a mailbox you have been granted permission to in the Outlook Web App (OWA) in Office 365, please do the following:
- Login to Office 365 at office365.atu.edu
- While logged in to Office 365, in the upper right hand corner click the image of the person and click "Open another mailbox".
Begin typing the email address of the mailbox you want to open, then click the suggested mailbox from the list.
Then click Open to open the mailbox in a new tab.