Sometimes you may be given access to a mailbox separate from your own to monitor or manage. With Office 365 in most cases this mailbox will automatically be added to your Outlook, but in some circumstances you’ll need to set the mailbox to open explicitly inside Outlook. This article will go through the steps to add another mailbox using the Outlook desktop app.

Outlook on Windows

  1. In Outlook click File > Info > Accounts Settings > Account Settings
  2. In the Account Settings window under the Email tab, select your account then click the Change… button
  3. In the Exchange Account Settings window click the More Settings button
  4. In the Microsoft Exchange window click the Advanced tab then click the Add… button
  5. Enter the email address for the mailbox then click OK. You should see the new account added in the list.
  6. Add any other addresses you wish to then click OK, then close the other windows you had opened up in previous steps. The new mailbox(es) should appear in the list on the left-hand side of Outlook for you now.

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Outlook on MacOS

  1. With the Outlook app open click Outlook in the menu bar then click Preferences…
  2. In the Outlook Preferences window click Accounts 
  3. Select your Office 365 account, then click the Advanced… button
  4. In the next window click the Delegates tab then click the + button
  5. Enter the email address for the mailbox you’re adding then click the Add button. If you see a notice
  6. Repeat step 4 & 5 to add any additional accounts you wish to, when you’re done click the OK button and close any other windows you opened in previous steps. If a notice appears saying outlook was redirected, it’s safe to click the Always use my response for this server and then click the Allow button.

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