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".
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Begin typing the email address of the mailbox you want to open, then click the suggested mailbox from the list.
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Then click Open to open the mailbox in a new tab.