Exchange - Add an Additional Mailbox in Outlook for Windows


  • How do I add an additional Exchange mailbox in Outlook for Windows?


  • Oregon State University
  • Exchange Email


You may have multiple Exchange mailboxes that you use for work.


  1. Click File in the upper left corner of your Outlook window.
  2. From the Info tab on the top of the sidebar that comes up, click Account Settings and then click Account Settings... in the dropdown menu that appears.
  3. From the Account Settings Email tab, click New...
  4. Enter in the email address of the additional mailbox and click Connect
  5. Select "Sign in with a different account"
  6. In the username field, enter your ONID username in the format and click Next
  7. Enter in your ONID password on the next screen and click Sign in


    Note: If your ONID credentials don't work, contact your IT support team.

  8. Click Done when it says Account successfully added

    Note: If a browser Windows opens up saying "Complete your outlook setup..." (See below), you may close this window.  This is Microsoft suggesting to install the Outlook mobile app on your mobile device, which is not needed to complete the setup.

  9. You will be prompted to restart Outlook. Once you do, the shared mailbox should appear in the Outlook sidebar.


If you're having trouble adding an additional mailbox to Outlook, try these steps:

  • On step 5 above, make sure you select the option to "sign in with a different account" - you want to add the secondary mailbox, but sign in as you.
  • Confirm that you have permissions by trying to open the mailbox with Outlook on the Web:
    • In a web browser, visit this URL but replace "" with the email address of the mailbox:
    • When prompted, login with your (for student employees, this might be
  • If you have Outlook 2016, try upgrading Office to Office 365 or Office 2019.


For assistance, contact the Service Desk.

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Article ID: 45717
Wed 1/3/18 1:57 PM
Thu 3/7/24 12:46 PM

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These instructions are for connecting your Windows computer to a Network Drive if your Windows computer is on the OSU network or VPN.