Open another mailbox in Outlook Web App

Open another mailbox in Outlook Web App

If you have Full Access to another mailbox (such as a Shared Mailbox) and need to be log in as that mailbox, you can use the “Open another mailbox…” feature of the Outlook Web App to do so.  From here, you can check email and set Out of Office auto-replies and set up rules for the mailbox.

  • Log in to your mailbox via the Outlook Web App.
  • Click your name in the top right hand site of the screen between the presence indicator and the Options gear.
  • Choose “Open another mailbox…”

  • At the "Open another mailbox" prompt, specify the mailbox you wish to open.  If you cannot find the mailbox, it may not exist as a mailbox or may be hidden in the Address List.
  • Click “Open.” 
  • The mailbox will open in another tab.
You may get an error indicating that “Something went wrong” and that “you don’t have permission to open this mailbox.”  

If this happens, you do not have permissions and the current Owner of the mailbox should request permission for you.  They can do so using the Exchange Support and Request Form

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  • Author: Enterprise Collaboration and Messaging
  • Department: Enterprise Collaboration & Messaging
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